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Ni M, He J, Li T, Zhao G, Ji Z, Ren F, Leng J, Wu M, Huang R, Li P, Hou L. Establishment and Characterization of SV40 T-Antigen Immortalized Porcine Muscle Satellite Cell. Cells 2024; 13:703. [PMID: 38667318 PMCID: PMC11049531 DOI: 10.3390/cells13080703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/06/2024] [Accepted: 04/06/2024] [Indexed: 04/28/2024] Open
Abstract
Muscle satellite cells (MuSCs) are crucial for muscle development and regeneration. The primary pig MuSCs (pMuSCs) is an ideal in vitro cell model for studying the pig's muscle development and differentiation. However, the long-term in vitro culture of pMuSCs results in the gradual loss of their stemness, thereby limiting their application. To address this conundrum and maintain the normal function of pMuSCs during in vitro passaging, we generated an immortalized pMuSCs (SV40 T-pMuSCs) by stably expressing SV40 T-antigen (SV40 T) using a lentiviral-based vector system. The SV40 T-pMuSCs can be stably sub-cultured for over 40 generations in vitro. An evaluation of SV40 T-pMuSCs was conducted through immunofluorescence staining, quantitative real-time PCR, EdU assay, and SA-β-gal activity. Their proliferation capacity was similar to that of primary pMuSCs at passage 1, and while their differentiation potential was slightly decreased. SiRNA-mediated interference of SV40 T-antigen expression restored the differentiation capability of SV40 T-pMuSCs. Taken together, our results provide a valuable tool for studying pig skeletal muscle development and differentiation.
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Affiliation(s)
- Mengru Ni
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
| | - Jingqing He
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
| | - Tao Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
| | - Gan Zhao
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhengyu Ji
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
| | - Fada Ren
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
| | - Jianxin Leng
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
| | - Mengyan Wu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
| | - Ruihua Huang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
- Huai’an Academy, Nanjing Agricultural University, Huai’an 223001, China
| | - Pinghua Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
- Huai’an Academy, Nanjing Agricultural University, Huai’an 223001, China
| | - Liming Hou
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; (M.N.); (J.H.); (T.L.); (G.Z.); (Z.J.); (F.R.); (J.L.); (M.W.); (R.H.); (P.L.)
- Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Pig Genetic Resources Evaluation and Utilization (Nanjing) of Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
- Huai’an Academy, Nanjing Agricultural University, Huai’an 223001, China
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Peng WY, Abere B, Shi H, Toland S, Smithgall TE, Moore PS, Chang Y. Membrane-bound Merkel cell polyomavirus middle T protein constitutively activates PLCγ1 signaling through Src-family kinases. Proc Natl Acad Sci U S A 2023; 120:e2316467120. [PMID: 38079542 PMCID: PMC10740393 DOI: 10.1073/pnas.2316467120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 11/11/2023] [Indexed: 12/18/2023] Open
Abstract
Merkel cell polyomavirus (MCV or MCPyV) is an alphapolyomavirus causing human Merkel cell carcinoma and encodes four tumor (T) antigen proteins: large T (LT), small tumor (sT), 57 kT, and middle T (MT)/alternate LT open reading frame proteins. We show that MCV MT is generated as multiple isoforms through internal methionine translational initiation that insert into membrane lipid rafts. The membrane-localized MCV MT oligomerizes and promiscuously binds to lipid raft-associated Src family kinases (SFKs). MCV MT-SFK interaction is mediated by a Src homology (SH) 3 recognition motif as determined by surface plasmon resonance, coimmunoprecipitation, and bimolecular fluorescence complementation assays. SFK recruitment by MT leads to tyrosine phosphorylation at a SH2 recognition motif (pMTY114), allowing interaction with phospholipase C gamma 1 (PLCγ1). The secondary recruitment of PLCγ1 to the SFK-MT membrane complex promotes PLCγ1 tyrosine phosphorylation on Y783 and activates the NF-κB inflammatory signaling pathway. Mutations at either the MCV MT SH2 or SH3 recognition sites abrogate PLCγ1-dependent activation of NF-κB signaling and increase viral replication after MCV genome transfection into 293 cells. These findings reveal a conserved viral targeting of the SFK-PLCγ1 pathway by both MCV and murine polyomavirus (MuPyV) MT proteins. The molecular steps in how SFK-PLCγ1 activation is achieved, however, differ between these two viruses.
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Affiliation(s)
- Wen-Yu Peng
- School of Medicine, Tsinghua University, Beijing100084, China
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
| | - Bizunesh Abere
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA15219
| | - Haibin Shi
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA15219
| | - Sabrina Toland
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
| | - Thomas E. Smithgall
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA15219
| | - Patrick S. Moore
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA15219
| | - Yuan Chang
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA15213
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA15213
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Wan L, Toland S, Robinson-McCarthy LR, Lee N, Schaich MA, Hengel SR, Li X, Bernstein KA, Van Houten B, Chang Y, Moore PS. Unlicensed origin DNA melting by MCV and SV40 polyomavirus LT proteins is independent of ATP-dependent helicase activity. Proc Natl Acad Sci U S A 2023; 120:e2308010120. [PMID: 37459531 PMCID: PMC10372695 DOI: 10.1073/pnas.2308010120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 06/21/2023] [Indexed: 07/20/2023] Open
Abstract
Cellular eukaryotic replication initiation helicases are first loaded as head-to-head double hexamers on double-stranded (ds) DNA origins and then initiate S-phase DNA melting during licensed (once per cell cycle) replication. Merkel cell polyomavirus (MCV) large T (LT) helicase oncoprotein similarly binds and melts its own 98-bp origin but replicates multiple times in a single cell cycle. To examine the actions of this unlicensed viral helicase, we quantitated multimerization of MCV LT molecules as they assembled on MCV DNA origins using real-time single-molecule microscopy. MCV LT formed highly stable double hexamers having 17-fold longer mean lifetime (τ, >1,500 s) on DNA than single hexamers. Unexpectedly, partial MCV LT assembly without double-hexamer formation was sufficient to melt origin dsDNA as measured by RAD51, RPA70, or S1 nuclease cobinding. DNA melting also occurred with truncated MCV LT proteins lacking the helicase domain, but was lost from a protein without the multimerization domain that could bind only as a monomer to DNA. SV40 polyomavirus LT also multimerized to the MCV origin without forming a functional hexamer but still melted origin DNA. MCV origin melting did not require ATP hydrolysis and occurred for both MCV and SV40 LT proteins using the nonhydrolyzable ATP analog, adenylyl-imidodiphosphate (AMP-PNP). LT double hexamers formed in AMP-PNP, and melted DNA, consistent with direct LT hexamer assembly around single-stranded (ss) DNA without the energy-dependent dsDNA-to-ssDNA melting and remodeling steps used by cellular helicases. These results indicate that LT multimerization rather than helicase activity is required for origin DNA melting during unlicensed virus replication.
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Affiliation(s)
- Li Wan
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15213
| | - Sabrina Toland
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15213
| | | | - Nara Lee
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15219
| | - Matthew A Schaich
- Genome Stability Program, Hillman Cancer Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15232
| | - Sarah R Hengel
- Department of Pharmacology, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15232
| | - Xiaochen Li
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15213
- School of Medicine, Tsinghua University, Beijing 100084, China
| | - Kara A Bernstein
- Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Bennett Van Houten
- Genome Stability Program, Hillman Cancer Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15232
| | - Yuan Chang
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15213
| | - Patrick S Moore
- Cancer Virology Program, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15213
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Falquet M, Prezioso C, Ludvigsen M, Bruun JA, Passerini S, Sveinbjørnsson B, Pietropaolo V, Moens U. Regulation of Transcriptional Activity of Merkel Cell Polyomavirus Large T-Antigen by PKA-Mediated Phosphorylation. Int J Mol Sci 2023; 24:ijms24010895. [PMID: 36614338 PMCID: PMC9820997 DOI: 10.3390/ijms24010895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/13/2022] [Accepted: 12/23/2022] [Indexed: 01/06/2023] Open
Abstract
Merkel cell polyomavirus (MCPyV) is the major cause of Merkel cell carcinoma (MCC), an aggressive skin cancer. MCPyV large T-antigen (LTag) and small T-antigen (sTag) are the main oncoproteins involved in MCPyV-induced MCC. A hallmark of MCPyV-positive MCC cells is the expression of a C-terminal truncated LTag. Protein kinase A (PKA) plays a fundamental role in a variety of biological processes, including transcription by phosphorylating and thereby regulating the activity of transcription factors. As MCPyV LTag has been shown to be phosphorylated and acts as a transcription factor for the viral early and late promoter, we investigated whether LTag can be phosphorylayted by PKA, and whether this affects the transcript activity of LTag. Using a phosphorylation prediction algorithm, serine 191, 203, and 265 were identified as putative phosphorylation sites for PKA. Mass spectrometry of in vitro PKA-phosphorylated peptides confirmed phosphorylation of S203 and S265, but not S191. Full-length LTag inhibited early and late promoter activity of MCPyV, whereas the truncated MKL2 LTag variant stimulated both promoters. Single non-phosphorylable, as well as phosphomimicking mutations did not alter the inhibitory effect of full-length LTag. However, the non-phosphorylable mutations abrogated transactivation of the MCPyV promoters by MKL2 LTag, whereas phosphomimicking substitutions restored the ability of MKL2 LTag to activate the promoters. Triple LTag and MKL2 LTag mutants had the same effect as the single mutants. Activation of the PKA signaling pathway did not enhance MCPyV promoter activity, nor did it affect LTag expression levels in MCPyV-positive Merkel cell carcinoma (MCC) cells. Our results show that phosphorylation of truncated LTag stimulates viral promoter activity, which may contribute to higher levels of the viral oncoproteins LTag and sTag. Interfering with PKA-induced LTag phosphorylation/activity may be a therapeutic strategy to treat MCPyV-positive MCC patients.
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Affiliation(s)
- Mar Falquet
- Molecular Inflammation Research Group, Department of Medical Biology, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Carla Prezioso
- Microbiology of Chronic Neuro-Degenerative Pathologies, IRCSS San Raffaele, 00163 Rome, Italy
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, 00185 Rome, Italy
| | - Maria Ludvigsen
- Molecular Inflammation Research Group, Department of Medical Biology, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Jack-Ansgar Bruun
- Department of Medical Biology, Proteomics Platform, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Sara Passerini
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, 00185 Rome, Italy
| | - Baldur Sveinbjørnsson
- Molecular Inflammation Research Group, Department of Medical Biology, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
- Childhood Cancer Research Unit, Department of Women’s and Children’s Health, Karolinska Institute, 17177 Stockholm, Sweden
| | - Valeria Pietropaolo
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, 00185 Rome, Italy
- Correspondence: (V.P.); (U.M.)
| | - Ugo Moens
- Microbiology of Chronic Neuro-Degenerative Pathologies, IRCSS San Raffaele, 00163 Rome, Italy
- Correspondence: (V.P.); (U.M.)
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Spurgeon ME, Cheng J, Ward-Shaw E, Dick FA, DeCaprio JA, Lambert PF. Merkel cell polyomavirus large T antigen binding to pRb promotes skin hyperplasia and tumor development. PLoS Pathog 2022; 18:e1010551. [PMID: 35560034 PMCID: PMC9132321 DOI: 10.1371/journal.ppat.1010551] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 05/25/2022] [Accepted: 04/26/2022] [Indexed: 12/14/2022] Open
Abstract
Clear evidence supports a causal link between Merkel cell polyomavirus (MCPyV) and the highly aggressive human skin cancer called Merkel cell carcinoma (MCC). Integration of viral DNA into the human genome facilitates continued expression of the MCPyV small tumor (ST) and large tumor (LT) antigens in virus-positive MCCs. In MCC tumors, MCPyV LT is truncated in a manner that renders the virus unable to replicate yet preserves the LXCXE motif that facilitates its binding to and inactivation of the retinoblastoma tumor suppressor protein (pRb). We previously developed a MCPyV transgenic mouse model in which MCC tumor-derived ST and truncated LT expression were targeted to the stratified epithelium of the skin, causing epithelial hyperplasia, increased proliferation, and spontaneous tumorigenesis. We sought to determine if any of these phenotypes required the association between the truncated MCPyV LT and pRb. Mice were generated in which K14-driven MCPyV ST/LT were expressed in the context of a homozygous RbΔLXCXE knock-in allele that attenuates LT-pRb interactions through LT's LXCXE motif. We found that many of the phenotypes including tumorigenesis that develop in the K14-driven MCPyV transgenic mice were dependent upon LT's LXCXE-dependent interaction with pRb. These findings highlight the importance of the MCPyV LT-pRb interaction in an in vivo model for MCPyV-induced tumorigenesis.
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Affiliation(s)
- Megan E. Spurgeon
- McArdle Laboratory for Cancer Research, Department of Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America
- * E-mail:
| | - Jingwei Cheng
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, New Hampshire, United States of America
| | - Ella Ward-Shaw
- McArdle Laboratory for Cancer Research, Department of Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Frederick A. Dick
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada
- Children’s Health Research Institute, London, Ontario, Canada
- London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - James A. DeCaprio
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Paul F. Lambert
- McArdle Laboratory for Cancer Research, Department of Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America
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Martínez-Nieto G, Heljasvaara R, Heikkinen A, Kaski HK, Devarajan R, Rinne O, Henriksson C, Thomson E, von Hertzen C, Miinalainen I, Ruotsalainen H, Pihlajaniemi T, Karppinen SM. Deletion of Col15a1 Modulates the Tumour Extracellular Matrix and Leads to Increased Tumour Growth in the MMTV-PyMT Mouse Mammary Carcinoma Model. Int J Mol Sci 2021; 22:9978. [PMID: 34576139 PMCID: PMC8467152 DOI: 10.3390/ijms22189978] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 09/05/2021] [Accepted: 09/10/2021] [Indexed: 12/18/2022] Open
Abstract
Basement membrane (BM) zone-associated collagen XV (ColXV) has been shown to suppress the malignancy of tumour cells, and its restin domain can inhibit angiogenesis. In human breast cancer, as well as in many other human carcinomas, ColXV is lost from the epithelial BM zone prior to tumour invasion. Here, we addressed the roles of ColXV in breast carcinogenesis using the transgenic MMTV-PyMT mouse mammary carcinoma model. We show here for the first time that the inactivation of Col15a1 in mice leads to changes in the fibrillar tumour matrix and to increased mammary tumour growth. ColXV is expressed by myoepithelial and endothelial cells in mammary tumours and is lost from the ductal BM along with the loss of the myoepithelial layer during cancer progression while persisting in blood vessels and capillaries, even in invasive tumours. However, despite the absence of anti-angiogenic restin domain, neovascularisation was reduced rather than increased in the ColXV-deficient mammary tumours compared to controls. We also show that, in robust tumour cell transplantation models or in a chemical-induced fibrosarcoma model, the inactivation of Col15a1 does not affect tumour growth or angiogenesis. In conclusion, our results support the proposed tumour suppressor function of ColXV in mammary carcinogenesis and reveal diverse roles of this collagen in different cancer types.
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MESH Headings
- Animals
- Antigens, Polyomavirus Transforming/metabolism
- Breast Neoplasms/genetics
- Breast Neoplasms/pathology
- Carcinogenesis/pathology
- Cell Proliferation
- Collagen/deficiency
- Collagen/genetics
- Collagen/metabolism
- Disease Models, Animal
- Extracellular Matrix/metabolism
- Female
- Fibrosarcoma/pathology
- Fibrosis
- Gene Deletion
- Gene Expression Regulation, Neoplastic
- Humans
- Mammary Neoplasms, Animal/genetics
- Mammary Neoplasms, Animal/pathology
- Mammary Neoplasms, Animal/ultrastructure
- Mammary Tumor Virus, Mouse/physiology
- Mice, Inbred C57BL
- Mice, Knockout
- Neovascularization, Pathologic/pathology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Stromal Cells/pathology
- Stromal Cells/ultrastructure
- Survival Analysis
- Mice
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Affiliation(s)
- Guillermo Martínez-Nieto
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Ritva Heljasvaara
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Anne Heikkinen
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
- Biocenter Oulu, University of Oulu, 90220 Oulu, Finland;
| | - Hanne-Kaisa Kaski
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Raman Devarajan
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Otto Rinne
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Charlotta Henriksson
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Emmi Thomson
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Camilla von Hertzen
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | | | - Heli Ruotsalainen
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Taina Pihlajaniemi
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
| | - Sanna-Maria Karppinen
- Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland; (G.M.-N.); (R.H.); (A.H.); (H.-K.K.); (R.D.); (O.R.); (C.H.); (E.T.); (C.v.H.); (H.R.); (T.P.)
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7
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Ge Y, Smits AM, Liu J, Zhang J, van Brakel TJ, Goumans MJTH, Jongbloed MRM, de Vries AAF. Generation, Characterization, and Application of Inducible Proliferative Adult Human Epicardium-Derived Cells. Cells 2021; 10:2064. [PMID: 34440833 PMCID: PMC8391799 DOI: 10.3390/cells10082064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 12/20/2022] Open
Abstract
RATIONALE In recent decades, the great potential of human epicardium-derived cells (EPDCs) as an endogenous cell source for cardiac regeneration has been recognized. The limited availability and low proliferation capacity of primary human EPDCs and phenotypic differences between EPDCs obtained from different individuals hampers their reproducible use for experimental studies. AIM To generate and characterize inducible proliferative adult human EPDCs for use in fundamental and applied research. METHODS AND RESULTS Inducible proliferation of human EPDCs was achieved by doxycycline-controlled expression of simian virus 40 large T antigen (LT) with a repressor-based lentiviral Tet-On system. In the presence of doxycycline, these inducible EPDCs (iEPDCs) displayed high and long-term proliferation capacity. After doxycycline removal, LT expression ceased and the iEPDCs regained their cuboidal epithelial morphology. Similar to primary EPDCs, iEPDCs underwent an epithelial-to-mesenchymal transition (EMT) after stimulation with transforming growth factor β3. This was confirmed by reverse transcription-quantitative polymerase chain reaction analysis of epithelial and mesenchymal marker gene expression and (immuno) cytochemical staining. Collagen gel-based cell invasion assays demonstrated that mesenchymal iEPDCs, like primary EPDCs, possess increased invasion and migration capacities as compared to their epithelial counterparts. Mesenchymal iEPDCs co-cultured with sympathetic ganglia stimulated neurite outgrowth similarly to primary EPDCs. CONCLUSION Using an inducible LT expression system, inducible proliferative adult human EPDCs were generated displaying high proliferative capacity in the presence of doxycycline. These iEPDCs maintain essential epicardial characteristics with respect to morphology, EMT ability, and paracrine signaling following doxycycline removal. This renders iEPDCs a highly useful new in vitro model for studying human epicardial properties.
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Affiliation(s)
- Yang Ge
- Department of Anatomy & Embryology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands; (Y.G.); (M.R.M.J.)
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; (J.L.); (J.Z.); (A.A.F.d.V.)
| | - Anke M. Smits
- Department of Cell and Chemical Biology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands;
| | - Jia Liu
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; (J.L.); (J.Z.); (A.A.F.d.V.)
- Central Laboratory, Longgang District People’s Hospital of Shenzhen & The Third Affiliated Hospital of The Chinese University of Hong Kong, Shenzhen 518172, China
| | - Juan Zhang
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; (J.L.); (J.Z.); (A.A.F.d.V.)
| | - Thomas J. van Brakel
- Department of Cardiothoracic Surgery, Leiden University Medical Center, Albinusdreef 2, 2333 ZC Leiden, The Netherlands;
| | - Marie José T. H. Goumans
- Department of Cell and Chemical Biology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands;
| | - Monique R. M. Jongbloed
- Department of Anatomy & Embryology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands; (Y.G.); (M.R.M.J.)
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; (J.L.); (J.Z.); (A.A.F.d.V.)
| | - Antoine A. F. de Vries
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; (J.L.); (J.Z.); (A.A.F.d.V.)
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8
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Kwa MQ, Brandao R, Phung TH, Ge J, Scieri G, Brakebusch C. MRCKα Is Dispensable for Breast Cancer Development in the MMTV-PyMT Model. Cells 2021; 10:cells10040942. [PMID: 33921698 PMCID: PMC8073694 DOI: 10.3390/cells10040942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/07/2021] [Accepted: 04/15/2021] [Indexed: 11/16/2022] Open
Abstract
MRCKα is a ubiquitously expressed serine/threonine kinase involved in cell contraction and F-actin turnover, which is highly amplified in human breast cancer and part of a gene expression signature for bad prognosis. Nothing is known about the in vivo function of MRCKα. To explore MRCKα function in development and in breast cancer, we generated mice lacking a functional MRCKα gene. Mice were born close to the Mendelian ratio and showed no obvious phenotype including a normal mammary gland formation. Assessing breast cancer development using the transgenic MMTV-PyMT mouse model, loss of MRCKα did not affect tumor onset, tumor growth and metastasis formation. Deleting MRCKα and its related family member MRCKβ in two triple-negative breast cancer cell lines resulted in reduced invasion of MDA-MB-231 cells, but did not affect migration of 4T1 cells. Further genomic analysis of human breast cancers revealed that MRCKα is frequently co-amplified with the oncogenes ARID4B and AKT3 which might contribute to the prognostic value of MRCKα expression. Collectively, these data suggest that MRCKα might be a prognostic marker for breast cancer, but probably of limited functional importance.
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MESH Headings
- Actin Depolymerizing Factors/metabolism
- Actins/metabolism
- Animals
- Antigens, Neoplasm/metabolism
- Antigens, Polyomavirus Transforming/metabolism
- Base Sequence
- Carcinogenesis/drug effects
- Carcinogenesis/metabolism
- Carcinogenesis/pathology
- Cell Line, Tumor
- Cell Survival/drug effects
- Collagen/pharmacology
- Disease Models, Animal
- Female
- Gels/pharmacology
- Humans
- Mammary Glands, Animal/pathology
- Mammary Neoplasms, Animal/genetics
- Mammary Neoplasms, Animal/metabolism
- Mammary Tumor Virus, Mouse/drug effects
- Mammary Tumor Virus, Mouse/physiology
- Mice
- Mice, Knockout
- Mutation/genetics
- Myosins/metabolism
- Myotonin-Protein Kinase/metabolism
- Neoplasm Invasiveness
- Neoplasm Metastasis
- Neoplasm Proteins/metabolism
- Phenotype
- Phosphorylation/drug effects
- Polymerization/drug effects
- Protein Serine-Threonine Kinases/metabolism
- Proto-Oncogene Proteins c-akt/metabolism
- Triple Negative Breast Neoplasms/pathology
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Affiliation(s)
- Mei Qi Kwa
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
| | - Rafael Brandao
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
| | - Trong H. Phung
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
- Centre College, 600 W Walnut St, Danville, KY 40422, USA
| | - Jianfeng Ge
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
- Medical Research Centre (MRC) Cancer Unit, Hutchison/MRC Research Centre, University of Cambridge, P.O. Box 197, Biomedical Campus, Cambridge CB2 0XZ, UK
| | - Giuseppe Scieri
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
| | - Cord Brakebusch
- Biotech Research and Innovation Center (BRIC), University of Copenhagen, Ole Maaløes vej 5, 2200 Copenhagen, Denmark; (M.Q.K.); (R.B.); (T.H.P.); (J.G.); (G.S.)
- Correspondence:
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9
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Attalla S, Taifour T, Bui T, Muller W. Insights from transgenic mouse models of PyMT-induced breast cancer: recapitulating human breast cancer progression in vivo. Oncogene 2021; 40:475-491. [PMID: 33235291 PMCID: PMC7819848 DOI: 10.1038/s41388-020-01560-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/27/2020] [Accepted: 11/06/2020] [Indexed: 01/05/2023]
Abstract
Breast cancer is associated with the second highest cancer-associated deaths worldwide. Therefore, understanding the key events that determine breast cancer progression, modulation of the tumor-microenvironment and metastasis, which is the main cause of cancer-associated death, are of great importance. The mammary specific polyomavirus middle T antigen overexpression mouse model (MMTV-PyMT), first published in 1992, is the most commonly used genetically engineered mouse model (GEMM) for cancer research. Mammary lesions arising in MMTV-PyMT mice follow similar molecular and histological progression as human breast tumors, making it an invaluable tool for cancer researchers and instrumental in understanding tumor biology. In this review, we will highlight key studies that demonstrate the utility of PyMT derived GEMMs in understanding the molecular basis of breast cancer progression, metastasis and highlight its use as a pre-clinical tool for therapeutic discovery.
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Affiliation(s)
- Sherif Attalla
- Department of Biochemistry, McGill University, Montreal, QC, H3A 1A3, Canada
- Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada
| | - Tarek Taifour
- Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada
- Faculty of Medicine, McGill University, Montreal, QC, H3A 1A3, Canada
| | - Tung Bui
- Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada
| | - William Muller
- Department of Biochemistry, McGill University, Montreal, QC, H3A 1A3, Canada.
- Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada.
- Faculty of Medicine, McGill University, Montreal, QC, H3A 1A3, Canada.
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10
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Sundaram S, Yan L. Adipose monocyte chemotactic protein-1 deficiency reduces high-fat diet-enhanced mammary tumorigenesis in MMTV-PyMT mice. J Nutr Biochem 2020; 77:108313. [PMID: 31837540 DOI: 10.1016/j.jnutbio.2019.108313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/16/2019] [Accepted: 11/25/2019] [Indexed: 01/24/2023]
Abstract
Monocyte chemotactic protein-1 (MCP-1) is an adipokine with demonstrated carcinogenic potential. However, there is a lack of evidence whether adipose-produced MCP-1 contributes to breast cancer. We tested the hypothesis that adipose-produced MCP-1 contributes to mammary tumorigenesis in this study. In a breast cancer model of mouse mammary tumor virus-polyomavirus middle T-antigen (MMTV-PyMT), mice with or without adipose MCP-1 knockout [designated as Mcp-1-/- or wild-type (WT)] were fed the standard AIN93G diet (16% of energy from soybean oil) or a high-fat diet (HFD, 45% of energy from soybean oil). Adipose MCP-1 knockout reduced Mcp-1 expression in adipose tissue and concentrations of MCP-1 in plasma. Mcp-1-/- mice fed the HFD had less body fat than their WT counterparts. Adipose MCP-1 knockout attenuated HFD-enhanced mammary tumorigenesis, evidenced by lower mammary tumor volume. Furthermore, Mcp-1-/- mice, regardless of diet, had a longer tumor latency and less tumor weight than WT mice. When fed the HFD, Mcp-1-/- mice, compared to WT mice, exhibited lower concentrations of insulin, leptin, resistin, vascular endothelial growth factor and hepatic growth factor in plasma. In summary, adipose MCP-1 deficiency attenuated HFD-enhanced MMTV-PyMT mammary tumorigenesis. This attenuation can be attributed to less body adiposity, improvement in insulin sensitivity and down-regulation in protumorigenic inflammation cytokines and angiogenic factors in Mcp-1-/- mice. It concludes that adipose-produced MCP-1 contributes to mammary tumorigenesis in the MMTV-PyMT mouse model.
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Affiliation(s)
- Sneha Sundaram
- U.S. Department of Agriculture Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58203, USA.
| | - Lin Yan
- U.S. Department of Agriculture Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58203, USA.
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11
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Abstract
BEAS-2B was originally established as an immortalized but non-tumorigenic epithelial cell line from human bronchial epithelium. Because of general recognition for its bronchial epithelial origin, the BEAS-2B cell line has been widely used as an in vitro cell model in a large variety of studies associated with respiratory diseases including lung carcinogenesis. However, very few studies have discussed non-epithelial features of BEAS-2B cells, especially the features associated with mesenchymal stem cells (MSCs), which represent a group of fibroblast-like cells with limited self-renewal and differentiation potential to various cell lineages. In this study, we compared BEAS-2B with a human umbilical cord-derived MSCs (hMSCs) cell line, hMSC1, which served as a representative of hMSCs in terms of expressing common features of hMSCs. It was observed that both BEAS-2B and hMSC1 shared the same expression profile of surface markers of hMSCs and exhibited similar osteogenic and adipogenic differentiation potential. In addition, like hMSC1, the BEAS-2B cell line exhibited suppressive activities on proliferation of mitogen-activated total T lymphocytes as well as Th1 lymphocytes, and IFNγ-induced expression of IDO1, all thus demonstrating that BEAS-2B cells exhibited an almost identical characteristic profile with hMSCs, even though, there was a clear difference between BEAS-2B and hMSCs in the effects on type 2 macrophage polarization. Most importantly, the hMSCs features of BEAS-2B were unlikely a consequence of epithelial-mesenchymal transition. Therefore, this study provided a set of evidence to provoke reconsideration of epithelial origin of BEAS-2B.
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Affiliation(s)
- Xiaoyan Han
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, China
| | - Tao Na
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, China
| | - Tingting Wu
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, China
| | - Bao-Zhu Yuan
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, China
- * E-mail:
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12
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Katara GK, Kulshrestha A, Schneiderman S, Riehl V, Ibrahim S, Beaman KD. Interleukin-22 promotes development of malignant lesions in a mouse model of spontaneous breast cancer. Mol Oncol 2020; 14:211-224. [PMID: 31725949 PMCID: PMC6944104 DOI: 10.1002/1878-0261.12598] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 10/24/2019] [Accepted: 11/12/2019] [Indexed: 12/24/2022] Open
Abstract
Interleukin (IL)-22 is recognized as a tumor-supporting cytokine and is implicated in the proliferation of multiple epithelial cancers. In breast cancer, the current knowledge of IL-22 function is based on cell line models and little is known about how IL-22 affects the tumor initiation, proliferation, invasion, and metastasis in the in vivo system. Here, we investigated the tumor stage-specific function of IL-22 in disease development by evaluating the stage-by-stage progression of breast cancer in an IL-22 knockout spontaneous breast cancer mouse model. We found that among all the stages, IL-22 is specifically upregulated in tumor microenvironment (TME) during the malignant transformation stage of breast tumor progression. The deletion of IL-22 gene leads to the arrest of malignant transition stage, and reduced invasion and tumor burden. Administration of recombinant IL-22 in the TME does not influence in vivo tumor initiation and proliferation but only promotes malignant transformation of cancer cells. Mechanistically, deletion of IL-22 gene causes downregulation of epithelial-to-mesenchymal transition (EMT)-associated transcription factors in breast tumors, suggesting EMT as the mechanism of regulation of malignancy by IL-22. Clinically, in human breast tumor tissues, increased number of IL-22+ cells in the TME is associated with an aggressive phenotype of breast cancer. For the first time, this study provides an insight into the tumor stage-specific function of IL-22 in breast tumorigenesis.
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Affiliation(s)
- Gajendra K. Katara
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
| | - Arpita Kulshrestha
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
| | - Sylvia Schneiderman
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
| | - Valerie Riehl
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
| | - Safaa Ibrahim
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
- Department of Microbiology and ImmunologyFaculty of PharmacyCairo UniversityEgypt
| | - Kenneth D. Beaman
- Center for Cancer Cell Biology, Immunology and InfectionChicago Medical SchoolRosalind Franklin University of Medicine and ScienceNorth ChicagoILUSA
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13
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Maishi N, Kikuchi H, Sato M, Nagao-Kitamoto H, Annan DA, Baba S, Hojo T, Yanagiya M, Ohba Y, Ishii G, Masutomi K, Shinohara N, Hida Y, Hida K. Development of Immortalized Human Tumor Endothelial Cells from Renal Cancer. Int J Mol Sci 2019; 20:ijms20184595. [PMID: 31533313 PMCID: PMC6770423 DOI: 10.3390/ijms20184595] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 09/13/2019] [Accepted: 09/13/2019] [Indexed: 12/20/2022] Open
Abstract
Tumor angiogenesis research and antiangiogenic drug development make use of cultured endothelial cells (ECs) including the human microvascular ECs among others. However, it has been reported that tumor ECs (TECs) are different from normal ECs (NECs). To functionally validate antiangiogenic drugs, cultured TECs are indispensable tools, but are not commercially available. Primary human TECs are available only in small quantities from surgical specimens and have a short life span in vitro due to their cellular senescence. We established immortalized human TECs (h-imTECs) and their normal counterparts (h-imNECs) by infection with lentivirus producing simian virus 40 large T antigen and human telomerase reverse transcriptase to overcome the replication barriers. These ECs exhibited an extended life span and retained their characteristic endothelial morphology, expression of endothelial marker, and ability of tube formation. Furthermore, h-imTECs showed their specific characteristics as TECs, such as increased proliferation and upregulation of TEC markers. Treatment with bevacizumab, an antiangiogenic drug, dramatically decreased h-imTEC survival, whereas the same treatment failed to alter immortalized NEC survival. Hence, these h-imTECs could be a valuable tool for drug screening to develop novel therapeutic agents specific to TECs or functional biological assays in tumor angiogenesis research.
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Affiliation(s)
- Nako Maishi
- Vascular Biology and Molecular Pathology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Hiroshi Kikuchi
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
- Department of Renal and Genitourinary Surgery, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
| | - Masumi Sato
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
| | - Hiroko Nagao-Kitamoto
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Dorcas A Annan
- Vascular Biology and Molecular Pathology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
| | - Shogo Baba
- Vascular Biology and Molecular Pathology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Takayuki Hojo
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
- Department of Dental Anesthesiology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Misa Yanagiya
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
- Department of Oral Diagnosis and Medicine, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Yusuke Ohba
- Department of Cell Physiology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan.
| | - Genichiro Ishii
- Division of Pathology, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa 277-8577, Japan.
| | - Kenkichi Masutomi
- Division of Cancer Stem Cell, National Cancer Center Research Institute, Tokyo 104-0045, Japan.
| | - Nobuo Shinohara
- Department of Renal and Genitourinary Surgery, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
| | - Yasuhiro Hida
- Department of Cardiovascular and Thoracic Surgery, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
| | - Kyoko Hida
- Vascular Biology and Molecular Pathology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
- Vascular Biology, Frontier Research Unit, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
- Department of Vascular Biology, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
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Ó hAinmhire E, Wu H, Muto Y, Donnelly EL, Machado FG, Fan LX, Chang-Panesso M, Humphreys BD. A conditionally immortalized Gli1-positive kidney mesenchymal cell line models myofibroblast transition. Am J Physiol Renal Physiol 2019; 316:F63-F75. [PMID: 30303712 PMCID: PMC6383201 DOI: 10.1152/ajprenal.00460.2018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Glioma-associated oncogene homolog-1 (Gli1)-positive resident mesenchymal stem cell-like cells are the predominant source of kidney myofibroblasts in fibrosis, but investigating Gli1-positive myofibroblast progenitor activation is hampered by the difficulty of isolating and propagating primary cultures of these cells. Using a genetic strategy with positive and negative selection, we isolated Kidney-Gli1 (KGli1) cells that maintain expression of appropriate mesenchymal stem cell-like cell markers, respond to hedgehog pathway activation, and display robust myofibroblast differentiation upon treatment with transforming growth factor-β (TGF-β). Coculture of KGli1 cells with endothelium stabilizes capillary formation. Single-cell RNA sequencing (scRNA-seq) analysis during differentiation identified autocrine ligand-receptor pair upregulation and a strong focal adhesion pathway signal. This led us to test the serum response factor inhibitor CCG-203971 that potently inhibited TGF-β-induced pericyte-to-myofibroblast transition. scRNA-seq also identified the unexpected upregulation of nerve growth factor (NGF), which we confirmed in two mouse kidney fibrosis models. The Ngf receptor Ntrk1 is expressed in tubular epithelium in vivo, suggesting a novel interstitial-to-tubule paracrine signaling axis. Thus, KGli1 cells accurately model myofibroblast activation in vitro, and the development of this cell line provides a new tool to study resident mesenchymal stem cell-like progenitors in health and disease.
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Affiliation(s)
- Eoghainín Ó hAinmhire
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Haojia Wu
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Yoshiharu Muto
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Erinn L Donnelly
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Flavia G Machado
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Lucy X Fan
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Monica Chang-Panesso
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
| | - Benjamin D Humphreys
- Division of Nephrology, Department of Medicine, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
- Department of Developmental Biology, Washington University in Saint Louis School of Medicine , St. Louis, Missouri
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15
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Mao SPH, Park M, Cabrera RM, Christin JR, Karagiannis GS, Oktay MH, Zaiss DMW, Abrams SI, Guo W, Condeelis JS, Kenny PA, Segall JE. Loss of amphiregulin reduces myoepithelial cell coverage of mammary ducts and alters breast tumor growth. Breast Cancer Res 2018; 20:131. [PMID: 30367629 PMCID: PMC6203982 DOI: 10.1186/s13058-018-1057-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 10/02/2018] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Amphiregulin (AREG), a ligand of the epidermal growth factor receptor, is not only essential for proper mammary ductal development, but also associated with breast cancer proliferation and growth. In the absence of AREG, mammary ductal growth is stunted and fails to expand. Furthermore, suppression of AREG expression in estrogen receptor-positive breast tumor cells inhibits in-vitro and in-vivo growth. METHODS We crossed AREG-null (AREG-/-) mice with the murine luminal B breast cancer model, MMTV-PyMT (PyMT), to generate spontaneous breast tumors that lack AREG (AREG-/- PyMT). We evaluated tumor growth, cytokeratin-8 (K8)-positive luminal cells, cytokeratin-14 (K14)-positive myoepithelial cells, and expression of AREG, Ki67, and PyMT. Primary myoepithelial cells from nontumor-bearing AREG+/+ mice underwent fluorescence-activated cell sorting and were adapted to culture for in-vitro coculture studies with AT-3 cells, a cell line derived from C57Bl/6 PyMT mammary tumors. RESULTS Intriguingly, PyMT-induced lesions progress more rapidly in AREG-/- mice than in AREG+/+ mice. Quantification of K8+ luminal and K14+ myoepithelial cells in non-PyMT AREG-/- mammary glands showed fewer K14+ cells and a thinner myoepithelial layer. Study of AT-3 cells indicated that coculture with myoepithelial cells or exposure to AREG, epidermal growth factor, or basic fibroblast growth factor can suppress PyMT expression. Late-stage AREG-/- PyMT tumors are significantly less solid in structure, with more areas of papillary and cystic growth. Papillary areas appear to be both less proliferative and less necrotic. In The Cancer Genome Atlas database, luminal-B invasive papillary carcinomas have lower AREG expression than luminal B invasive ductal carcinomas. CONCLUSIONS Our study has revealed a previously unknown role of AREG in myoepithelial cell development and PyMT expression. AREG expression is essential for proper myoepithelial coverage of mammary ducts. Both AREG and myoepithelial cells can suppress PyMT expression. We find that lower AREG expression is associated with invasive papillary breast cancer in both the MMTV-PyMT model and human breast cancer.
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MESH Headings
- Amphiregulin/genetics
- Amphiregulin/metabolism
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Cell Line, Tumor
- Cell Proliferation
- Epithelial Cells/pathology
- Epithelial Cells/virology
- Female
- Humans
- Mammary Glands, Animal/cytology
- Mammary Glands, Animal/pathology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mammary Tumor Virus, Mouse/pathogenicity
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Neoplasm Invasiveness/pathology
- Polyomavirus/genetics
- Polyomavirus/immunology
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Affiliation(s)
- Serena P. H. Mao
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
| | - Minji Park
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
| | - Ramon M. Cabrera
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
| | - John R. Christin
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | - George S. Karagiannis
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
- Gruss Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY 10461 USA
- Integrated Imaging Program, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | - Maja H. Oktay
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
- Gruss Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY 10461 USA
- Integrated Imaging Program, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | - Dietmar M. W. Zaiss
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, UK
| | - Scott I. Abrams
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263 USA
| | - Wenjun Guo
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | - John S. Condeelis
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
- Gruss Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY 10461 USA
- Integrated Imaging Program, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | - Paraic A. Kenny
- Kabara Cancer Research Institute, Gundersen Medical Foundation, La Crosse, WI 54601 USA
| | - Jeffrey E. Segall
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, Bronx, NY 10461 USA
- Gruss Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY 10461 USA
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16
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Shin HY, Yang W, Lee EJ, Han GH, Cho H, Chay DB, Kim JH. Establishment of five immortalized human ovarian surface epithelial cell lines via SV40 T antigen or HPV E6/E7 expression. PLoS One 2018; 13:e0205297. [PMID: 30296284 PMCID: PMC6175519 DOI: 10.1371/journal.pone.0205297] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 09/21/2018] [Indexed: 01/02/2023] Open
Abstract
Background Human ovarian surface epithelial (HOSE) cells are a critical cell source for ovarian cancer research; however, they are difficult to obtain and maintain under standard laboratory conditions in large quantities. The aim of this study was to generate immortalized HOSE (IHOSE) cells with maintained properties to the original cell source, thereby guaranteeing a sufficiently large cell quantity for ovarian cancer research. Methods HOSE cells isolated from four non-cancer patients and five IHOSE cell lines were established by induction of HPV-E6/E7 expression or SV40 large T antigen using a lenti-viral system. Each of IHOSE cells was confirmed to be distinct by STR profiling. RNA-sequencing was used to compare gene expression profiles in HOSE, IHOSE and ovarian cancer cells. Results RNA-sequencing results revealed a stronger linear correlation in gene expression between IHOSE and HOSE cells (R2 = 0.9288) than between IHOSE or HOSE cells and ovarian cancer cells (R2 = 0.8562 and R2 = 0.7982, respectively). The gene expression pattern of 319 differentially expressed genes revealed minimal differences between HOSE and IHOSE cells, while a strong difference between ovarian cancer cells and HOSE or IHOSE cells was observed. Furthermore, the five IHOSE cell lines displayed morphological characteristics typical of epithelial cells but showed a lower level of EpCAM, CD133 and E-cadherin, as cancer stem marker, than ovarian cancer cells. Moreover, unlike cancer cells, IHOSE cells could not form colonies in the anchorage-independent soft agar growth assay. Conclusion These findings demonstrate that five newly established IHOSE cell lines have characteristics of progenitor HOSE cells while exhibiting continuous growth, and thus, should be highly useful as control cells for ovarian cancer research.
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MESH Headings
- AC133 Antigen/genetics
- AC133 Antigen/metabolism
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- Cadherins/genetics
- Cadherins/metabolism
- Cell Line, Transformed
- Cell Line, Tumor
- Cell Proliferation
- Epithelial Cell Adhesion Molecule/genetics
- Epithelial Cell Adhesion Molecule/metabolism
- Epithelial Cells/cytology
- Epithelial Cells/metabolism
- Female
- Founder Effect
- Gene Expression
- Humans
- Oncogene Proteins, Viral/genetics
- Oncogene Proteins, Viral/metabolism
- Ovary/cytology
- Ovary/metabolism
- Papillomavirus E7 Proteins/genetics
- Papillomavirus E7 Proteins/metabolism
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Sequence Analysis, RNA
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Affiliation(s)
- Ha-Yeon Shin
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Wookyeom Yang
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Eun-ju Lee
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Gwan Hee Han
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Hanbyoul Cho
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Doo Byung Chay
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jae-hoon Kim
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
- * E-mail:
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17
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Madamba EV, Berthet EB, Francis NJ. Inheritance of Histones H3 and H4 during DNA Replication In Vitro. Cell Rep 2018; 21:1361-1374. [PMID: 29091772 DOI: 10.1016/j.celrep.2017.10.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 09/24/2017] [Accepted: 10/06/2017] [Indexed: 01/08/2023] Open
Abstract
Nucleosomes are believed to carry epigenetic information through the cell cycle, including through DNA replication. It has been known for decades that parental histones are reassembled on newly replicated chromatin, but the mechanisms underlying histone inheritance and dispersal during DNA replication are not fully understood. We monitored the fate of histones H3 or H4 from a single nucleosome through DNA replication in two in vitro systems. In the SV40 system, histones assembled on a single nucleosome positioning sequence can be inherited by their own daughter DNA but are dispersed from their original location. In Xenopus laevis extracts, histones are dynamic, and nucleosomes are repositioned independent of and prior to DNA replication. Nevertheless, a high fraction of histones H3 and H4 that are inherited through DNA replication remains near its starting location. Thus, inheritance of histone proteins and their dispersal can be mechanistically uncoupled.
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Affiliation(s)
- Egbert Vincent Madamba
- Department of Molecular and Cellular Biology, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA
| | - Ellora Bellows Berthet
- Department of Molecular and Cellular Biology, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA
| | - Nicole Jane Francis
- Institut de recherches clinique de Montréal (IRCM) and Département de biochimie et médecine moléculaire, Université de Montréal, Montréal, QC H2W 1R7 Canada.
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18
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Moens U, Song X, Van Ghelue M, Lednicky JA, Ehlers B. A Role of Sp1 Binding Motifs in Basal and Large T-Antigen-Induced Promoter Activities of Human Polyomavirus HPyV9 and Its Variant UF-1. Int J Mol Sci 2017; 18:ijms18112414. [PMID: 29135936 PMCID: PMC5713382 DOI: 10.3390/ijms18112414] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/08/2017] [Accepted: 11/10/2017] [Indexed: 12/19/2022] Open
Abstract
Human polyomavirus 9 (HPyV9) was originally detected in the serum of a renal transplant patient. Seroepidemiological studies showed that ~20-50% of the human population have antibodies against this virus. HPyV9 has not yet been associated with any disease and little is known about the route of infection, transmission, host cell tropism, and genomic variability in circulating strains. Recently, the HPyV9 variant UF-1 with an eight base-pair deletion, a thirteen base-pair insertion and with point mutations, creating three putative Sp1 binding sites in the late promoter was isolated from an AIDS patient. Transient transfection studies with a luciferase reporter plasmid driven by HPyV9 or UF1 promoter demonstrated that UF1 early and late promoters were stronger than HPyV9 promoters in most cell lines, and that the UF1 late promoter was more potently activated by HPyV9 large T-antigen (LTAg). Mutation of two Sp1 motifs strongly reduced trans-activation of the late UF1 promoter by HPyV9 LTAg in HeLa cells. In conclusion, the mutations in the UF1 late promoter seem to strengthen its activity and its response to stimulation by HPyV9 LTAg in certain cells. It remains to be investigated whether these promoter changes have an influence on virus replication and affect the possible pathogenic properties of the virus.
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Affiliation(s)
- Ugo Moens
- Molecular Inflammation Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, 9037 Tromsø, Norway.
| | - Xiaobo Song
- Host Microbe Interaction Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, 9037 Tromsø, Norway.
| | - Marijke Van Ghelue
- Department of Medical Genetics, University Hospital Northern-Norway, 9038 Tromsø, Norway.
| | - John A Lednicky
- Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida, Gainesville , FL 32603, USA.
| | - Bernhard Ehlers
- Division 12, Measles, Mumps, Rubella and Viruses Affecting Immunocompromised Patients, Robert Koch Institute, 13353 Berlin, Germany.
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19
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Cheng J, Park DE, Berrios C, White EA, Arora R, Yoon R, Branigan T, Xiao T, Westerling T, Federation A, Zeid R, Strober B, Swanson SK, Florens L, Bradner JE, Brown M, Howley PM, Padi M, Washburn MP, DeCaprio JA. Merkel cell polyomavirus recruits MYCL to the EP400 complex to promote oncogenesis. PLoS Pathog 2017; 13:e1006668. [PMID: 29028833 PMCID: PMC5640240 DOI: 10.1371/journal.ppat.1006668] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 09/25/2017] [Indexed: 11/19/2022] Open
Abstract
Merkel cell carcinoma (MCC) frequently contains integrated copies of Merkel cell polyomavirus DNA that express a truncated form of Large T antigen (LT) and an intact Small T antigen (ST). While LT binds RB and inactivates its tumor suppressor function, it is less clear how ST contributes to MCC tumorigenesis. Here we show that ST binds specifically to the MYC homolog MYCL (L-MYC) and recruits it to the 15-component EP400 histone acetyltransferase and chromatin remodeling complex. We performed a large-scale immunoprecipitation for ST and identified co-precipitating proteins by mass spectrometry. In addition to protein phosphatase 2A (PP2A) subunits, we identified MYCL and its heterodimeric partner MAX plus the EP400 complex. Immunoprecipitation for MAX and EP400 complex components confirmed their association with ST. We determined that the ST-MYCL-EP400 complex binds together to specific gene promoters and activates their expression by integrating chromatin immunoprecipitation with sequencing (ChIP-seq) and RNA-seq. MYCL and EP400 were required for maintenance of cell viability and cooperated with ST to promote gene expression in MCC cell lines. A genome-wide CRISPR-Cas9 screen confirmed the requirement for MYCL and EP400 in MCPyV-positive MCC cell lines. We demonstrate that ST can activate gene expression in a EP400 and MYCL dependent manner and this activity contributes to cellular transformation and generation of induced pluripotent stem cells.
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Affiliation(s)
- Jingwei Cheng
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Donglim Esther Park
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Graduate School of Arts and Sciences, Harvard University, Boston, Massachusetts, United States of America
| | - Christian Berrios
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Microbiology and Immunobiology, Harvard Medical School; Boston, Massachusetts, United States of America
| | - Elizabeth A. White
- Department of Microbiology and Immunobiology, Harvard Medical School; Boston, Massachusetts, United States of America
| | - Reety Arora
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Rosa Yoon
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Graduate School of Arts and Sciences, Harvard University, Boston, Massachusetts, United States of America
| | - Timothy Branigan
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Graduate School of Arts and Sciences, Harvard University, Boston, Massachusetts, United States of America
| | - Tengfei Xiao
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Thomas Westerling
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Alexander Federation
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Graduate School of Arts and Sciences, Harvard University, Boston, Massachusetts, United States of America
| | - Rhamy Zeid
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Graduate School of Arts and Sciences, Harvard University, Boston, Massachusetts, United States of America
| | - Benjamin Strober
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Selene K. Swanson
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Laurence Florens
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - James E. Bradner
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Myles Brown
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Peter M. Howley
- Department of Microbiology and Immunobiology, Harvard Medical School; Boston, Massachusetts, United States of America
| | - Megha Padi
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Michael P. Washburn
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - James A. DeCaprio
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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20
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Berrios C, Padi M, Keibler MA, Park DE, Molla V, Cheng J, Lee SM, Stephanopoulos G, Quackenbush J, DeCaprio JA. Merkel Cell Polyomavirus Small T Antigen Promotes Pro-Glycolytic Metabolic Perturbations Required for Transformation. PLoS Pathog 2016; 12:e1006020. [PMID: 27880818 PMCID: PMC5120958 DOI: 10.1371/journal.ppat.1006020] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Accepted: 10/23/2016] [Indexed: 02/01/2023] Open
Abstract
Merkel cell polyomavirus (MCPyV) is an etiological agent of Merkel cell carcinoma (MCC), a highly aggressive skin cancer. The MCPyV small tumor antigen (ST) is required for maintenance of MCC and can transform normal cells. To gain insight into cellular perturbations induced by MCPyV ST, we performed transcriptome analysis of normal human fibroblasts with inducible expression of ST. MCPyV ST dynamically alters the cellular transcriptome with increased levels of glycolytic genes, including the monocarboxylate lactate transporter SLC16A1 (MCT1). Extracellular flux analysis revealed increased lactate export reflecting elevated aerobic glycolysis in ST expressing cells. Inhibition of MCT1 activity suppressed the growth of MCC cell lines and impaired MCPyV-dependent transformation of IMR90 cells. Both NF-κB and MYC have been shown to regulate MCT1 expression. While MYC was required for MCT1 induction, MCPyV-induced MCT1 levels decreased following knockdown of the NF-κB subunit RelA, supporting a synergistic activity between MCPyV and MYC in regulating MCT1 levels. Several MCC lines had high levels of MYCL and MYCN but not MYC. Increased levels of MYCL was more effective than MYC or MYCN in increasing extracellular acidification in MCC cells. Our results demonstrate the effects of MCPyV ST on the cellular transcriptome and reveal that transformation is dependent, at least in part, on elevated aerobic glycolysis. In 2008, Merkel cell polyomavirus (MCPyV) was identified as clonally integrated in a majority of Merkel cell carcinomas (MCC), a rare but highly aggressive neuroendocrine carcinoma of the skin. Since then, studies have highlighted the roles of the MCPyV T antigens in promoting and sustaining MCC oncogenesis. In particular, MCPyV small T antigen (ST) has oncogenic activity in vivo and in vitro. We performed transcriptome analysis of normal human fibroblasts with inducible expression of MCPyV ST and observed significant alterations in levels of metabolic pathway genes, particularly those involved in glycolysis. MCT1, a major monocarboxylate transporter, was rapidly induced following ST expression and inhibition of MCT1 activity reduced the ST growth promoting and transforming activities. The metabolic perturbations induced by this oncogenic human polyomavirus reflect a potent transforming mechanism of MCPyV ST.
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Affiliation(s)
- Christian Berrios
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Graduate School of Arts and Sciences, Harvard University, Cambridge, Massachusetts, United States of America
| | - Megha Padi
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Mark A. Keibler
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Donglim Esther Park
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Graduate School of Arts and Sciences, Harvard University, Cambridge, Massachusetts, United States of America
| | - Vadim Molla
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Jingwei Cheng
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Soo Mi Lee
- Program in Virology, Graduate School of Arts and Sciences, Harvard University, Cambridge, Massachusetts, United States of America
| | - Gregory Stephanopoulos
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - John Quackenbush
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, United States of America
| | - James A. DeCaprio
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Graduate School of Arts and Sciences, Harvard University, Cambridge, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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21
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Meng FY, Liu L, Yang FH, Li CY, Liu J, Zhou P. Reversible immortalization of human hepatocytes mediated by retroviral transfer and site-specific recombination. World J Gastroenterol 2014; 20:13119-13126. [PMID: 25278705 PMCID: PMC4177490 DOI: 10.3748/wjg.v20.i36.13119] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 03/30/2014] [Accepted: 06/26/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To establish a method for the reversible immortalization of human hepatocytes, which may offer a good and safe source of hepatocytes for practical applications.
METHODS: We successfully isolated primary human hepatocytes from surgically resected liver tissue taken from a patient with liver hemangiomas. The freshly isolated cells were then immortalized with retroviral vector SSR#69 expressing simian virus 40 large T antigen (SV40T) and hygromycin-resistance genes flanked by paired loxP recombination targets.
RESULTS: The freshly isolated hepatocytes with high viability (85%) were successfully immortalized using retroviral gene transfer of SV40T. SV40T in the immortalized cells was then excised by Cre/loxP site-specific recombination. This cell population exhibited the characteristics of differentiated hepatocytes.
CONCLUSION: We successfully established reversibly immortalized human hepatocytes, which will provide an unlimited supply of cells for practical applications.
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Kawasaki H, Ohama T, Hori M, Sato K. Establishment of mouse intestinal myofibroblast cell lines. World J Gastroenterol 2013; 19:2629-37. [PMID: 23674870 PMCID: PMC3645381 DOI: 10.3748/wjg.v19.i17.2629] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 12/03/2012] [Accepted: 01/11/2013] [Indexed: 02/06/2023] Open
Abstract
AIM To establish novel intestinal myofibroblast (IMF) cell lines from mouse colonic mucosa and investigate their biological characters. METHODS Primary IMFs were isolated from mucosal tissues of mouse colon that was denuded of epithelial cells and smooth muscle layer. For immortalization, primary IMFs were transfected with simian virus 40 large T antigen (designated as LmcMF). We also isolated some primary IMFs that spontaneously became immortalized without transfection (designated as SmcMF). To check immortality and normality of these cells, we examined their proliferative ability and contact inhibition. Moreover, the expression levels of proteins characterizing IMFs [including α-smooth muscle actin (α-SMA), vimentin, desmin, and type I collagen] and proteins associated with the immune response [such as toll-like receptor 4 (TLR-4), CD14, MD2, IκBα, and p-p38] were determined by Western blotting. The localization of several myofibroblast protein markers was also detected by immunofluorescence staining. RESULTS The cell growth assay results show that both LmcMF and SmcMF cells proliferated logarithmically at least up to passage 20. In addition, the contact inhibition assays show that LmcMF and SmcMF stopped growing after the cells reached confluence. These data suggest that these 2 types of cells were immortalized without losing contact inhibition of growth. Moreover, both LmcMF and SmcMF, like primary IMFs, showed spindle-shaped appearance. The expression levels of key myofibroblast protein markers, including α-SMA, vimentin, and desmin, were also examined by the Western blotting and immunofluorescence analyses. Our results show that these cells were positive for α-SMA and vimentin, but not desmin, as well as that both LmcMF and SmcMF expressed type I collagen at a lower level than primary IMFs. Finally, we investigated the expression level of lipopolysaccharide (LPS) receptor-related proteins, as well as the response of the cells to LPS treatment. We found that the TLR4, CD14, and MD-2 proteins were present in LmcMF and SmcMF, as well as in primary IMFs, and that all these cells responded to LPS. CONCLUSION We established 2 novel IMF cell lines from mouse colonic mucosa, namely, LmcMF and SmcMF, both of which were able to respond to LPS.
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Richter C, Thieme S, Bandoła J, Laugsch M, Anastassiadis K, Brenner S. Generation of inducible immortalized dendritic cells with proper immune function in vitro and in vivo. PLoS One 2013; 8:e62621. [PMID: 23626840 PMCID: PMC3633827 DOI: 10.1371/journal.pone.0062621] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 03/22/2013] [Indexed: 12/31/2022] Open
Abstract
Dendritic cells are the professional antigen presenting cells of innate immunity and key players in maintaining the balance of immune responses. Studies with dendritic cells are mainly limited by their low numbers in vivo and their difficult maintenance in vitro. We differentiated bone marrow cells from transgenic mice expressing an inducible SV40 large T-antigen into dendritic cells. When immortalized by dexamethasone and doxycycline, these cells were stable in long-term culture. In the absence of dexamethasone and doxycycline (de-induction), dendritic cells displayed properties of primary cells, characterized by expression of classical dendritic cell surface markers CD11c, CD11b, MHCII, CD40 and CD86. Furthermore, de-induced lipopolysaccharide activated dendritic cells secreted IL-1β, IL-6, TNFα and IL-12. De-induced, Ovalbumin-loaded dendritic cells polarize CD4(+) T cells into Th1, Th17 and Th2 cells, indicating their correct antigen presenting property. Consistent with intratracheal application of Ovalbumin-loaded primary dendritic cells into mice, the application of de-induced dendritic cells resulted in recruitment of lymphocytes to the lungs. In summary, we successfully expanded dendritic cells using conditional immortalization. The generated dendritic cells demonstrate the characteristic immunophenotype of primary dendritic cells and will facilitate further studies on immunomodulatory properties of dendritic cells.
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Affiliation(s)
- Cornelia Richter
- Department of Pediatrics, University Clinic Carl Gustav Carus, Technische Universitaet Dresden, Dresden, Germany.
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24
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Patel SJ, Molinolo AA, Gutkind S, Crawford NPS. Germline genetic variation modulates tumor progression and metastasis in a mouse model of neuroendocrine prostate carcinoma. PLoS One 2013; 8:e61848. [PMID: 23620793 PMCID: PMC3631138 DOI: 10.1371/journal.pone.0061848] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 03/14/2013] [Indexed: 01/03/2023] Open
Abstract
Neuroendocrine (NE) differentiation has gained increased attention as a prostate cancer (PC) prognostic marker. The aim of this study is to determine whether host germline genetic variation influences tumor progression and metastasis in C57BL/6-Tg(TRAMP)8247Ng/J (TRAMP) mouse model of aggressive NEPC. TRAMP mice were crossed to the eight progenitor strains of the Collaborative Cross recombinant inbred panel to address this. Tumor growth and metastasis burden were quantified in heterozygous transgene positive F1 male mice at 30 weeks of age. Compared to wild-type C57BL/6J-Tg(TRAMP)824Ng/J males, TRAMP x CAST/EiJ, TRAMP x NOD/ShiLtJ and TRAMP x NZO/HlLtJ F1 males displayed significant increases in tumor growth. Conversely, TRAMP x WSB/EiJ and TRAMP x PWK/PhJ F1 males displayed significant reductions in tumor growth. Interestingly, despite reduced tumor burden, TRAMP x WSB/EiJ males had an increased nodal metastasis burden. Patterns of distant pulmonary metastasis tended to follow the same patterns as that of local dissemination in each of the strains. All tumors and metastases displayed positive staining for NE markers, synaptophysin, and FOXA2. These experiments conclusively demonstrate that the introduction of germline variation by breeding modulates tumor growth, local metastasis burden, and distant metastasis frequency in this model of NEPC. These strains will be useful as model systems to facilitate the identification of germline modifier genes that promote the development of aggressive forms of PC.
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MESH Headings
- Animals
- Antigens, Polyomavirus Transforming/metabolism
- Biomarkers, Tumor/metabolism
- Carcinoma, Neuroendocrine/genetics
- Carcinoma, Neuroendocrine/pathology
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/pathology
- Crosses, Genetic
- Disease Models, Animal
- Disease Progression
- Epithelium/metabolism
- Epithelium/pathology
- Female
- Genetic Variation
- Genotype
- Germ Cells/pathology
- Humans
- Male
- Mice
- Mice, Inbred Strains
- Mice, Transgenic
- Neoplasm Metastasis
- Phenotype
- Prostate/metabolism
- Prostate/pathology
- Prostatic Neoplasms/genetics
- Prostatic Neoplasms/pathology
- Survival Analysis
- Tumor Burden
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Affiliation(s)
- Shashank J. Patel
- Metastasis Genetics Section, Cancer Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Alfredo A. Molinolo
- Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Silvio Gutkind
- Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Nigel P. S. Crawford
- Metastasis Genetics Section, Cancer Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
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25
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Siddiqui S, Khan I, Zarina S, Ali S. Use of the SYBR Green dye for measuring helicase activity. Enzyme Microb Technol 2013; 52:196-8. [PMID: 23410932 DOI: 10.1016/j.enzmictec.2012.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 12/25/2012] [Accepted: 12/26/2012] [Indexed: 10/27/2022]
Abstract
Here we describe a non-radioactive assay that exploits the fluorescent dye SYBR Green to measure the helicase enzyme activity. SYBR Green I emits fluorescence upon intercalation with double-stranded DNA or RNA. The fluorescence is lost proportionally as the nucleic acid is converted to single strands by a helicase, and this decrease in fluorescence intensity can be used to measure the activity of the helicase enzyme. The reaction was prepared by mixing a double-stranded substrate with the helicase enzyme, buffer, ATP and SYBR Green I. After completion, the reaction was terminated by EDTA and fluorescence was measured. Using this technique, a linear increase in substrate release was observed with increasing time and helicase concentrations. The assay described here is speedy, efficient and economical; it holds promise for use in large-scale screening of drugs that target helicases.
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Affiliation(s)
- Sammer Siddiqui
- Department of Biological and Biomedical Sciences, The Aga Khan University, Karachi, Pakistan
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26
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Gorbunova V, Hine C, Tian X, Ablaeva J, Gudkov AV, Nevo E, Seluanov A. Cancer resistance in the blind mole rat is mediated by concerted necrotic cell death mechanism. Proc Natl Acad Sci U S A 2012; 109:19392-6. [PMID: 23129611 PMCID: PMC3511137 DOI: 10.1073/pnas.1217211109] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Blind mole rats Spalax (BMR) are small subterranean rodents common in the Middle East. BMR is distinguished by its adaptations to life underground, remarkable longevity (with a maximum documented lifespan of 21 y), and resistance to cancer. Spontaneous tumors have never been observed in spalacids. To understand the mechanisms responsible for this resistance, we examined the growth of BMR fibroblasts in vitro of the species Spalax judaei and Spalax golani. BMR cells proliferated actively for 7-20 population doublings, after which the cells began secreting IFN-β, and the cultures underwent massive necrotic cell death within 3 d. The necrotic cell death phenomenon was independent of culture conditions or telomere shortening. Interestingly, this cell behavior was distinct from that observed in another long-lived and cancer-resistant African mole rat, Heterocephalus glaber, the naked mole rat in which cells display hypersensitivity to contact inhibition. Sequestration of p53 and Rb proteins using SV40 large T antigen completely rescued necrotic cell death. Our results suggest that cancer resistance of BMR is conferred by massive necrotic response to overproliferation mediated by p53 and Rb pathways, and triggered by the release of IFN-β. Thus, we have identified a unique mechanism that contributes to cancer resistance of this subterranean mammal extremely adapted to life underground.
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Affiliation(s)
- Vera Gorbunova
- Department of Biology, University of Rochester, Rochester, NY 14627
| | - Christopher Hine
- Department of Biology, University of Rochester, Rochester, NY 14627
| | - Xiao Tian
- Department of Biology, University of Rochester, Rochester, NY 14627
| | - Julia Ablaeva
- Department of Biology, University of Rochester, Rochester, NY 14627
| | - Andrei V. Gudkov
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263; and
| | - Eviatar Nevo
- Institute of Evolution, University of Haifa, Haifa 31905, Israel
| | - Andrei Seluanov
- Department of Biology, University of Rochester, Rochester, NY 14627
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27
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Fine DA, Rozenblatt-Rosen O, Padi M, Korkhin A, James RL, Adelmant G, Yoon R, Guo L, Berrios C, Zhang Y, Calderwood MA, Velmurgan S, Cheng J, Marto JA, Hill DE, Cusick ME, Vidal M, Florens L, Washburn MP, Litovchick L, DeCaprio JA. Identification of FAM111A as an SV40 host range restriction and adenovirus helper factor. PLoS Pathog 2012; 8:e1002949. [PMID: 23093934 PMCID: PMC3475652 DOI: 10.1371/journal.ppat.1002949] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Accepted: 08/22/2012] [Indexed: 11/18/2022] Open
Abstract
The small genome of polyomaviruses encodes a limited number of proteins that are highly dependent on interactions with host cell proteins for efficient viral replication. The SV40 large T antigen (LT) contains several discrete functional domains including the LXCXE or RB-binding motif, the DNA binding and helicase domains that contribute to the viral life cycle. In addition, the LT C-terminal region contains the host range and adenovirus helper functions required for lytic infection in certain restrictive cell types. To understand how LT affects the host cell to facilitate viral replication, we expressed full-length or functional domains of LT in cells, identified interacting host proteins and carried out expression profiling. LT perturbed the expression of p53 target genes and subsets of cell-cycle dependent genes regulated by the DREAM and the B-Myb-MuvB complexes. Affinity purification of LT followed by mass spectrometry revealed a specific interaction between the LT C-terminal region and FAM111A, a previously uncharacterized protein. Depletion of FAM111A recapitulated the effects of heterologous expression of the LT C-terminal region, including increased viral gene expression and lytic infection of SV40 host range mutants and adenovirus replication in restrictive cells. FAM111A functions as a host range restriction factor that is specifically targeted by SV40 LT. Viruses have evolved numerous mechanisms to counteract host cell defenses to facilitate productive infection. Simian Virus 40 (SV40) replication depends on specific interactions between large T antigen (LT) and a wide variety of host cell proteins. Although the LT C-terminal region has no evident enzymatic activity, mutations or deletions of this region significantly reduce the ability of the virus to replicate in restrictive cell types. Here, we identified host proteins that bind to LT and determined that the LT C-terminal region binds specifically to FAM111A. This physical interaction was required for efficient viral replication and sustained viral gene expression in restrictive cell types. In addition, RNAi-mediated knockdown of FAM111A levels in restrictive cells restored lytic infection of SV40 host range mutants and human adenovirus. These results indicate that FAM111A plays an important role in viral host range restriction. Our study provides insights into the viral-host perturbations caused by SV40 LT and the interaction of viruses with host restriction factors.
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Affiliation(s)
- Debrah A. Fine
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Harvard University Graduate School of Arts and Sciences, Division of Medical Sciences, Boston, Massachusetts, United States of America
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Orit Rozenblatt-Rosen
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Megha Padi
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Computational Biology, Department of Biostatistics and Computational Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, United States of America
| | - Anna Korkhin
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Robert L. James
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Guillaume Adelmant
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Blais Proteomics Center and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Rosa Yoon
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Harvard University Graduate School of Arts and Sciences, Division of Medical Sciences, Boston, Massachusetts, United States of America
| | - Luxuan Guo
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Christian Berrios
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Harvard University Graduate School of Arts and Sciences, Division of Medical Sciences, Boston, Massachusetts, United States of America
| | - Ying Zhang
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Michael A. Calderwood
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Soundarapandian Velmurgan
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Jingwei Cheng
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jarrod A. Marto
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Blais Proteomics Center and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - David E. Hill
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Michael E. Cusick
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Marc Vidal
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Laurence Florens
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Michael P. Washburn
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Department of Pathology and Laboratory Medicine, The University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - Larisa Litovchick
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - James A. DeCaprio
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Program in Virology, Harvard University Graduate School of Arts and Sciences, Division of Medical Sciences, Boston, Massachusetts, United States of America
- Genomic Analysis of Network Perturbations Center of Excellence in Genomic Science, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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28
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Sariyer IK, Merabova N, Patel PK, Knezevic T, Rosati A, Turco MC, Khalili K. Bag3-induced autophagy is associated with degradation of JCV oncoprotein, T-Ag. PLoS One 2012; 7:e45000. [PMID: 22984599 PMCID: PMC3440322 DOI: 10.1371/journal.pone.0045000] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 08/11/2012] [Indexed: 01/12/2023] Open
Abstract
JC virus, JCV, is a human neurotropic polyomavirus whose replication in glial cells causes the fatal demyelinating disease progressive multifocal leukoencephalopathy (PML). In addition, JCV possesses oncogenic activity and expression of its transforming protein, large T-antigen (T-Ag), in several experimental animals induces tumors of neural origin. Further, the presence of JCV DNA and T-Ag have been repeatedly observed in several human malignant tissues including primitive neuroectodermal tumors and glioblastomas. Earlier studies have demonstrated that Bag3, a member of the Bcl-2-associated athanogene (Bag) family of proteins, which is implicated in autophagy and apoptosis, is downregulated upon JCV infection of glial cells and that JCV T-Ag is responsible for suppressing the activity of the BAG3 promoter. Here, we investigated the possible impact of Bag3 on T-Ag expression in JCV-infected human primary glial cells as well as in cells derived from T-Ag-induced medulloblastoma in transgenic animals. Results from these studies revealed that overexpression of Bag3 drastically decreases the level of T-Ag expression by inducing the autophagic degradation of the viral protein. Interestingly, this event leads to the inhibition of JCV infection of glial cells, suggesting that the reduced levels of T-antigen seen upon the overexpression of Bag3 has a biological impact on the viral lytic cycle. Results from protein-protein interaction studies showed that T-Ag and Bag3 physically interact with each other through the zinc-finger of T-Ag and the proline rich domains of Bag3, and this interaction is important for the autophagic degradation of T-Ag. Our observations open a new avenue of research for better understanding of virus-host interaction by investigating the interplay between T-Ag and Bag3, and their impact on the development of JCV-associated diseases.
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MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/metabolism
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Apoptosis Regulatory Proteins
- Astrocytes/cytology
- Astrocytes/metabolism
- Astrocytes/virology
- Autophagy
- Binding Sites
- Blotting, Western
- Cell Line, Tumor
- Cells, Cultured
- DNA, Viral/genetics
- Gene Dosage
- Host-Pathogen Interactions
- Humans
- JC Virus/genetics
- JC Virus/metabolism
- JC Virus/physiology
- Mice
- Mice, Transgenic
- Polymerase Chain Reaction
- Protein Binding
- Proteolysis
- RNA Interference
- Tumor Cells, Cultured
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Affiliation(s)
- Ilker Kudret Sariyer
- Department of Neuroscience and Center for Neurovirology Temple University School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Nana Merabova
- Department of Neuroscience and Center for Neurovirology Temple University School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Prem Kumer Patel
- Department of Neuroscience and Center for Neurovirology Temple University School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Tijana Knezevic
- Department of Neuroscience and Center for Neurovirology Temple University School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Alessandra Rosati
- Department of Pharmaceutical and Biomedical Sciences (FARMABIOMED), University of Salerno, Fisciano, Italy
| | - Maria C. Turco
- Department of Pharmaceutical and Biomedical Sciences (FARMABIOMED), University of Salerno, Fisciano, Italy
| | - Kamel Khalili
- Department of Neuroscience and Center for Neurovirology Temple University School of Medicine, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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29
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Cramer EP, Glenthøj A, Häger M, Juncker-Jensen A, Engelholm LH, Santoni-Rugiu E, Lund LR, Laerum OD, Cowland JB, Borregaard N. No effect of NGAL/lipocalin-2 on aggressiveness of cancer in the MMTV-PyMT/FVB/N mouse model for breast cancer. PLoS One 2012; 7:e39646. [PMID: 22737251 PMCID: PMC3380857 DOI: 10.1371/journal.pone.0039646] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Accepted: 05/24/2012] [Indexed: 11/22/2022] Open
Abstract
NGAL/lipocalin-2 is a siderophore-binding protein that is highly expressed in several cancers. It is suggested to confer a proliferative advantage to cancer cells. Its expression has been correlated with aggressiveness of breast cancer as determined both in patients and in mouse breast cancer models. This was recently confirmed in two mouse models of spontaneous breast cancer in wild-type and lipocalin-2-deficient mice. We used a similar strategy using a different mouse strain. Lipocalin-2-deficient mice and mouse mammary tumor virus-polyoma middle T antigen (MMTV-PyMT) mice were crossed into the same FVB/N background. All mice developed tumors by week 8. The mice were sacrificed on week 13 and tissue was processed for biochemical and histological analysis. The total tumor volume and number of metastases were quantitated in 26 lipocalin-2-deficient mice and 34 wild-type controls. Lipocalin-2 expression in tumors of MMTV-PyMT-positive and wild-type mice was assessed by quantitative real-time PCR and by immunohistochemistry. The expression of the lipocalin-2 receptors 24p3R and megalin and of Mmp-9, transferrin receptor, and Bdh2 (a producer of a mammalian siderophore) were quantitated by real-time PCR. No significant difference was observed between wild-type and lipocalin-2-deficient mice. Lipocalin-2 was highly expressed in tumors from wild-type mice, but the expression did not correlate with tumor size. No effect of lipocalin-2 was observed with respect to time to tumor appearance, total tumor volume, or to the number of metastases. Histology and gelatinolytic activity of the mammary tumors did not differ between wild-type and lipocalin-2-deficient mice. We conclude that NGAL/lipocalin-2 does not invariably affect the aggressiveness of breast cancers as assessed in mouse models, thus questioning the role of lipocalin-2 in cancer development.
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Affiliation(s)
- Elisabeth P. Cramer
- The Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Andreas Glenthøj
- The Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Mattias Häger
- The Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Anna Juncker-Jensen
- Finsen Laboratory, National University Hospital, Rigshospitalet, University of Copenhagen, Denmark
| | - Lars H. Engelholm
- Finsen Laboratory, National University Hospital, Rigshospitalet, University of Copenhagen, Denmark
| | - Eric Santoni-Rugiu
- Department of Pathology, National University Hospital, Rigshospitalet, University of Copenhagen, Denmark
| | - Leif R. Lund
- Department of Cellular and Molecular Medicine, University of Copenhagen, Denmark
| | - Ole D. Laerum
- Finsen Laboratory, National University Hospital, Rigshospitalet, University of Copenhagen, Denmark
- The Gade Institute, Section of Pathology, University of Bergen, Norway
| | - Jack B. Cowland
- The Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark
- * E-mail: (JBC); (NB)
| | - Niels Borregaard
- The Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Copenhagen, Denmark
- * E-mail: (JBC); (NB)
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30
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Kang JH, Krause S, Tobin H, Mammoto A, Kanapathipillai M, Ingber DE. A combined micromagnetic-microfluidic device for rapid capture and culture of rare circulating tumor cells. Lab Chip 2012; 12:2175-81. [PMID: 22453808 DOI: 10.1039/c2lc40072c] [Citation(s) in RCA: 182] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Here we describe a combined microfluidic-micromagnetic cell separation device that has been developed to isolate, detect and culture circulating tumor cells (CTCs) from whole blood, and demonstrate its utility using blood from mammary cancer-bearing mice. The device was fabricated from polydimethylsiloxane and contains a microfluidic architecture with a main channel and redundant 'double collection' channel lined by two rows of dead-end side chambers for tumor cell collection. The microdevice design was optimized using computational simulation to determine dimensions, magnetic forces and flow rates for cell isolation using epithelial cell adhesion molecule (EpCAM) antibody-coated magnetic microbeads (2.8 μm diameter). Using this device, isolation efficiencies increased in a linear manner and reached efficiencies close to 90% when only 2 to 80 breast cancer cells were spiked into a small volume (1.0 mL) of blood taken from wild type mice. The high sensitivity visualization capabilities of the device also allowed detection of a single cell within one of its dead-end side chambers. When blood was removed from FVB C3(1)-SV40 T-antigen mammary tumor-bearing transgenic mice at different stages of tumor progression, cells isolated in the device using anti-EpCAM-beads and magnetically collected within the dead-end side chambers, also stained positive for pan-cytokeratin-FITC and DAPI, negative for CD45-PerCP, and expressed SV40 large T antigen, thus confirming their identity as CTCs. Using this isolation approach, we detected a time-dependent rise in the number of CTCs in blood of female transgenic mice, with a dramatic increase in the numbers of metastatic tumor cells appearing in the blood after 20 weeks when tumors transition to invasive carcinoma and exhibit increased growth of metastases in this model. Importantly, in contrast to previously described CTC isolation methods, breast tumor cells collected from a small volume of blood removed from a breast tumor-bearing animal remain viable and they can be easily removed from these devices and expanded in culture for additional analytical studies or potential drug sensitivity testing.
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Affiliation(s)
- Joo H Kang
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
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31
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Hsueh SP, Du JL, Hsu WB, Fang CA, Liu H, Wang WB. SV40 T/t-common polypeptide enhances the sensitivity of HER2-overexpressing human cancer cells to anticancer drugs cisplatin and doxorubicin. Cancer Lett 2012; 324:48-57. [PMID: 22546288 DOI: 10.1016/j.canlet.2012.04.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2011] [Revised: 04/08/2012] [Accepted: 04/23/2012] [Indexed: 11/19/2022]
Abstract
HER2-overexpressing cancer cells are resistant to cisplatin (CDDP) and doxorubicin (DXR). Here we report that SV40 T/t-common polypeptide could specifically sensitize HER2-overexpressing cancer cells to CDDP and DXR and specifically enhance CDDP- or DXR-induced apoptosis in these cells. This activity of T/t-common may be attributed to its ability to inhibit Bcl-2 and Bcl-XL and to suppress ERK activity in CDDP- or DXR-treated HER2-overexpressing cancer cells. T/t-common could enhance the antitumor activity of DXR on HER2-overexpressing ovarian tumor in NOD/SCID mice, suggesting that combination therapy using T/t-common and chemotherapeutic agents may provide a new approach for treating HER2-overexpressing cancers.
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Affiliation(s)
- Shu-Ping Hsueh
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
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32
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Zimmerman R, Peng DJ, Lanz H, Zhang YH, Danen-Van Oorschot A, Qu S, Backendorf C, Noteborn M. PP2A inactivation is a crucial step in triggering apoptin-induced tumor-selective cell killing. Cell Death Dis 2012; 3:e291. [PMID: 22476099 PMCID: PMC3358009 DOI: 10.1038/cddis.2012.31] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 02/20/2012] [Accepted: 02/21/2012] [Indexed: 01/08/2023]
Abstract
Apoptin (apoptosis-inducing protein) harbors tumor-selective characteristics making it a potential safe and effective anticancer agent. Apoptin becomes phosphorylated and induces apoptosis in a large panel of human tumor but not normal cells. Here, we used an in vitro oncogenic transformation assay to explore minimal cellular factors required for the activation of apoptin. Flag-apoptin was introduced into normal fibroblasts together with the transforming SV40 large T antigen (SV40 LT) and SV40 small t antigen (SV40 ST) antigens. We found that nuclear expression of SV40 ST in normal cells was sufficient to induce phosphorylation of apoptin. Mutational analysis showed that mutations disrupting the binding of ST to protein phosphatase 2A (PP2A) counteracted this effect. Knockdown of the ST-interacting PP2A-B56γ subunit in normal fibroblasts mimicked the effect of nuclear ST expression, resulting in induction of apoptin phosphorylation. The same effect was observed upon downregulation of the PP2A-B56δ subunit, which is targeted by protein kinase A (PKA). Apoptin interacts with the PKA-associating protein BCA3/AKIP1, and inhibition of PKA in tumor cells by treatment with H89 increased the phosphorylation of apoptin, whereas the PKA activator cAMP partially reduced it. We infer that inactivation of PP2A, in particular, of the B56γ and B56δ subunits is a crucial step in triggering apoptin-induced tumor-selective cell death.
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Affiliation(s)
- R Zimmerman
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
| | - D-J Peng
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
- Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - H Lanz
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
| | - Y-H Zhang
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
| | - A Danen-Van Oorschot
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
| | - S Qu
- Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - C Backendorf
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
| | - M Noteborn
- Department of Molecular Genetics, Leiden Institute for Chemistry, Leiden University, Leiden, The Netherlands
- Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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33
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Huang E, Bi Y, Jiang W, Luo X, Yang K, Gao JL, Gao Y, Luo Q, Shi Q, Kim SH, Liu X, Li M, Hu N, Liu H, Cui J, Zhang W, Li R, Chen X, Shen J, Kong Y, Zhang J, Wang J, Luo J, He BC, Wang H, Reid RR, Luu HH, Haydon RC, Yang L, He TC. Conditionally immortalized mouse embryonic fibroblasts retain proliferative activity without compromising multipotent differentiation potential. PLoS One 2012; 7:e32428. [PMID: 22384246 PMCID: PMC3285668 DOI: 10.1371/journal.pone.0032428] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 01/26/2012] [Indexed: 12/29/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are multipotent cells which reside in many tissues and can give rise to multiple lineages including bone, cartilage and adipose. Although MSCs have attracted significant attention for basic and translational research, primary MSCs have limited life span in culture which hampers MSCs' broader applications. Here, we investigate if mouse mesenchymal progenitors can be conditionally immortalized with SV40 large T antigen and maintain long-term cell proliferation without compromising their multipotency. Using the system which expresses SV40 large T antigen flanked with Cre/loxP sites, we demonstrate that mouse embryonic fibroblasts (MEFs) can be efficiently immortalized by SV40 large T antigen. The conditionally immortalized MEFs (iMEFs) exhibit an enhanced proliferative activity and maintain long-term cell proliferation, which can be reversed by Cre recombinase. The iMEFs express most MSC markers and retain multipotency as they can differentiate into osteogenic, chondrogenic and adipogenic lineages under appropriate differentiation conditions in vitro and in vivo. The removal of SV40 large T reduces the differentiation potential of iMEFs possibly due to the decreased progenitor expansion. Furthermore, the iMEFs are apparently not tumorigenic when they are subcutaneously injected into athymic nude mice. Thus, the conditionally immortalized iMEFs not only maintain long-term cell proliferation but also retain the ability to differentiate into multiple lineages. Our results suggest that the reversible immortalization strategy using SV40 large T antigen may be an efficient and safe approach to establishing long-term cell culture of primary mesenchymal progenitors for basic and translational research, as well as for potential clinical applications.
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Affiliation(s)
- Enyi Huang
- School of Bioengineering, Chongqing University, Chongqing, China
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Yang Bi
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Stem Cell Biology and Therapy Laboratory of the Key Laboratory for Pediatrics co-designated by Chinese Ministry of Education and Chongqing Bureau of Education, The Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Wei Jiang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Xiaoji Luo
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Ke Yang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Jian-Li Gao
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Institute of Materia Medica, Zhejiang Chinese Medical University, Hangzhou, China
| | - Yanhong Gao
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Department of Geriatrics, Xinhua Hospital of Shanghai Jiatong University, Shanghai, China
| | - Qing Luo
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Stem Cell Biology and Therapy Laboratory of the Key Laboratory for Pediatrics co-designated by Chinese Ministry of Education and Chongqing Bureau of Education, The Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Qiong Shi
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Stephanie H. Kim
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Xing Liu
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Stem Cell Biology and Therapy Laboratory of the Key Laboratory for Pediatrics co-designated by Chinese Ministry of Education and Chongqing Bureau of Education, The Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Mi Li
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Stem Cell Biology and Therapy Laboratory of the Key Laboratory for Pediatrics co-designated by Chinese Ministry of Education and Chongqing Bureau of Education, The Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Ning Hu
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Hong Liu
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Jing Cui
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Wenwen Zhang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Ruidong Li
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Xiang Chen
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Department of Orthopaedic Surgery, The Affiliated Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Jikun Shen
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Yuhan Kong
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Jiye Zhang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Jinhua Wang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Jinyong Luo
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Bai-Cheng He
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
| | - Huicong Wang
- School of Bioengineering, Chongqing University, Chongqing, China
| | - Russell R. Reid
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Hue H. Luu
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Rex C. Haydon
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
| | - Li Yang
- School of Bioengineering, Chongqing University, Chongqing, China
- * E-mail: (T-CH); (LY)
| | - Tong-Chuan He
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago Medical Center, Chicago, Illinois, United States of America
- Stem Cell Biology and Therapy Laboratory of the Key Laboratory for Pediatrics co-designated by Chinese Ministry of Education and Chongqing Bureau of Education, The Children's Hospital of Chongqing Medical University, Chongqing, China
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education, and the Affiliated Hospitals of Chongqing Medical University, Chongqing, China
- * E-mail: (T-CH); (LY)
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34
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Hafner C, Houben R, Baeurle A, Ritter C, Schrama D, Landthaler M, Becker JC. Activation of the PI3K/AKT pathway in Merkel cell carcinoma. PLoS One 2012; 7:e31255. [PMID: 22363598 PMCID: PMC3281946 DOI: 10.1371/journal.pone.0031255] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 01/05/2012] [Indexed: 01/08/2023] Open
Abstract
Merkel cell carcinoma (MCC) is a highly aggressive skin cancer with an increasing incidence. The understanding of the molecular carcinogenesis of MCC is limited. Here, we scrutinized the PI3K/AKT pathway, one of the major pathways activated in human cancer, in MCC. Immunohistochemical analysis of 41 tumor tissues and 9 MCC cell lines revealed high levels of AKT phosphorylation at threonine 308 in 88% of samples. Notably, the AKT phosphorylation was not correlated with the presence or absence of the Merkel cell polyoma virus (MCV). Accordingly, knock-down of the large and small T antigen by shRNA in MCV positive MCC cells did not affect phosphorylation of AKT. We also analyzed 46 MCC samples for activating PIK3CA and AKT1 mutations. Oncogenic PIK3CA mutations were found in 2/46 (4%) MCCs whereas mutations in exon 4 of AKT1 were absent. MCC cell lines demonstrated a high sensitivity towards the PI3K inhibitor LY-294002. This finding together with our observation that the PI3K/AKT pathway is activated in the majority of human MCCs identifies PI3K/AKT as a potential new therapeutic target for MCC patients.
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Affiliation(s)
- Christian Hafner
- Department of Dermatology, University of Regensburg, Regensburg, Germany.
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35
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Abstract
In vitro, cellular immortalization and transformation define a model for multistep carcinogenesis and current ongoing challenges include the identification of specific molecular events associated with steps along this oncogenic pathway. Here, using NIH3T3 cells, we identified transcriptionally related events associated with the expression of Polyomavirus Large-T antigen (PyLT), a potent viral oncogene. We propose that a subset of these alterations in gene expression may be related to the early events that contribute to carcinogenesis. The proposed tumor suppressor Necdin, known to be regulated by p53, was within a group of genes that was consistently upregulated in the presence of PyLT. While Necdin is induced following p53 activation with different genotoxic stresses, Necdin induction by PyLT did not involve p53 activation or the Rb-binding site of PyLT. Necdin depletion by shRNA conferred a proliferative advantage to NIH3T3 and PyLT-expressing NIH3T3 (NIHLT) cells. In contrast, our results demonstrate that although overexpression of Necdin induced a growth arrest in NIH3T3 and NIHLT cells, a growing population rapidly emerged from these arrested cells. This population no longer showed significant proliferation defects despite high Necdin expression. Moreover, we established that Necdin is a negative regulator of p53-mediated growth arrest induced by nutlin-3, suggesting that Necdin upregulation could contribute to the bypass of a p53-response in p53 wild type tumors. To support this, we characterized Necdin expression in low malignant potential ovarian cancer (LMP) where p53 mutations rarely occur. Elevated levels of Necdin expression were observed in LMP when compared to aggressive serous ovarian cancers. We propose that in some contexts, the constitutive expression of Necdin could contribute to cancer promotion by delaying appropriate p53 responses and potentially promote genomic instability.
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Affiliation(s)
- Julie Lafontaine
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montréal, Québec, Canada
| | - Francis Rodier
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montréal, Québec, Canada
- Département de radiologie, radio-oncologie et médecine nucléaire, Université de Montréal, Montréal, Québec, Canada
| | - Véronique Ouellet
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montréal, Québec, Canada
| | - Anne-Marie Mes-Masson
- Centre de recherche du Centre hospitalier de l'Université de Montréal and Institut du cancer de Montréal, Montréal, Québec, Canada
- Département de médecine, Université de Montréal, Montréal, Québec, Canada
- * E-mail:
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36
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Williams CK, Vaithiyalingam S, Hammel M, Pipas J, Chazin WJ. Binding to retinoblastoma pocket domain does not alter the inter-domain flexibility of the J domain of SV40 large T antigen. Arch Biochem Biophys 2011; 518:111-8. [PMID: 22227098 DOI: 10.1016/j.abb.2011.12.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 12/19/2011] [Accepted: 12/19/2011] [Indexed: 11/17/2022]
Abstract
Simian Virus 40 uses the large T antigen (Tag) to bind and inactivate retinoblastoma tumor suppressor proteins (Rb), which can result in cellular transformation. Tag is a modular protein with four domains connected by flexible linkers. The N-terminal J domain of Tag is necessary for Rb inactivation. Binding of Rb is mediated by an LXCXE consensus motif immediately C-terminal to the J domain. Nuclear magnetic resonance (NMR) and small angle X-ray scattering (SAXS) were used to study the structural dynamics and interaction of Rb with the LXCXE motif, the J domain and a construct (N(260)) extending from the J domain through the origin binding domain (OBD). NMR and SAXS data revealed substantial flexibility between the domains in N(260). Binding of pRb to a construct containing the LXCXE motif and the J domain revealed weak interactions between pRb and the J domain. Analysis of the complex of pRb and N(260) indicated that the OBD is not involved and retains its dynamic independence from the remainder of Tag. These results support a 'chaperone' model in which the J domain of Tag changes its orientation as it acts upon different protein complexes.
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Affiliation(s)
- Christina K Williams
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-8725, USA
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37
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Anders K, Buschow C, Charo J, Blankenstein T. Depot formation of doxycycline impairs Tet-regulated gene expression in vivo. Transgenic Res 2011; 21:1099-107. [PMID: 22167485 DOI: 10.1007/s11248-011-9580-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 11/30/2011] [Indexed: 01/26/2023]
Abstract
The tetracycline (Tet) system is widely used for regulation of gene expression in vitro and in vivo. We constructed C57BL/6 transgenic mice (rtTA-CM2) with strong and ubiquitous reverse transactivator (rtTA2(S)-M2) gene expression. rtTA-CM2 mice were crossed to Tet-responsive reporter mice (LC-1) conditionally expressing the firefly luciferase (FLuc) gene under control of a Tet-responsive element, which allowed sensitive quantification of the transactivator activity by bioluminescent imaging. Following doxycycline (dox) application, up to 10(5)-fold increase in BL signal was measured. rtTA activity was inducible in most analyzed organs. After dox withdrawal the BL signal decreased significantly but did not disappear completely, most likely due to a dox depot formation in vivo. The residual dox was sufficient to partly down-regulate a Tet-off controlled oncogene in a tumor transplantation experiment, resulting in reduced tumor growth. rtTA-CM2 mice may be a useful tool to analyze the function of genes in various organs but also reveal that down-regulation of gene expression is not complete.
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MESH Headings
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Antineoplastic Agents/pharmacology
- Crosses, Genetic
- Doxycycline/pharmacology
- Drug Screening Assays, Antitumor/methods
- Founder Effect
- Gene Expression Regulation, Neoplastic
- Luciferases/genetics
- Luciferases/metabolism
- Luminescent Measurements
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Microinjections
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Oocytes/metabolism
- Promoter Regions, Genetic
- Simian virus 40/genetics
- Tandem Mass Spectrometry
- Trans-Activators/genetics
- Trans-Activators/metabolism
- Transcription, Genetic
- Transgenes
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Affiliation(s)
- Kathleen Anders
- Max-Delbrück-Center for Molecular Medicine, Robert-Rössle-Strasse 10, 13125, Berlin, Germany
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38
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Anders K, Buschow C, Herrmann A, Milojkovic A, Loddenkemper C, Kammertoens T, Daniel P, Yu H, Charo J, Blankenstein T. Oncogene-targeting T cells reject large tumors while oncogene inactivation selects escape variants in mouse models of cancer. Cancer Cell 2011; 20:755-67. [PMID: 22172721 PMCID: PMC3658305 DOI: 10.1016/j.ccr.2011.10.019] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Revised: 05/23/2011] [Accepted: 10/18/2011] [Indexed: 12/22/2022]
Abstract
The genetic instability of cancer cells frequently causes drug resistance. We established mouse cancer models, which allowed targeting of an oncogene by drug-mediated inactivation or monospecific CD8(+) effector T (T(E)) cells. Drug treatment of genetically unstable large tumors was effective but selected resistant clones in the long term. In contrast, T(E) cells completely rejected large tumors (≥500 mm(3)), if the target antigen was cancer-driving and expressed in sufficient amounts. Although drug-mediated oncogene inactivation selectively killed the cancer cells and left the tumor vasculature intact, which likely facilitated survival and growth of resistant clones, T(E) cell treatment led to blood vessel destruction and probably "bystander" elimination of escape variants, which did not require antigen cross-presentation by stromal cells.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- CD8-Positive T-Lymphocytes/physiology
- CD8-Positive T-Lymphocytes/transplantation
- Cell Line, Tumor
- Drug Resistance, Neoplasm/genetics
- Fibrosarcoma/blood supply
- Fibrosarcoma/genetics
- Fibrosarcoma/metabolism
- Fibrosarcoma/therapy
- Genes, Reporter
- Genomic Instability
- Immunotherapy, Adoptive
- Interferon-gamma/metabolism
- Luciferases, Firefly/biosynthesis
- Luciferases, Firefly/genetics
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, SCID
- Molecular Sequence Data
- Neoplasm Transplantation
- Oncogenes
- Point Mutation
- Skin Transplantation
- Stomach Neoplasms/therapy
- Trans-Activators/genetics
- Tumor Escape/genetics
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Affiliation(s)
- Kathleen Anders
- Max-Delbrück-Center for Molecular Medicine, 13092 Berlin, Germany
| | - Christian Buschow
- Institute of Immunology, Charité Campus Benjamin Franklin, 12200 Berlin, Germany
| | - Andreas Herrmann
- Cancer Immunotherapeutics & Tumor Immunology, Beckman Research Institute, City of Hope Cancer Center, Duarte, CA 91010 USA
| | - Ana Milojkovic
- Department of Hematology, Oncology and Tumor Immunology, Charité, Campus Berlin Buch, 13092, Berlin, Germany
| | | | - Thomas Kammertoens
- Institute of Immunology, Charité Campus Benjamin Franklin, 12200 Berlin, Germany
| | - Peter Daniel
- Department of Hematology, Oncology and Tumor Immunology, Charité, Campus Berlin Buch, 13092, Berlin, Germany
| | - Hua Yu
- Cancer Immunotherapeutics & Tumor Immunology, Beckman Research Institute, City of Hope Cancer Center, Duarte, CA 91010 USA
| | - Jehad Charo
- Max-Delbrück-Center for Molecular Medicine, 13092 Berlin, Germany
| | - Thomas Blankenstein
- Max-Delbrück-Center for Molecular Medicine, 13092 Berlin, Germany
- Institute of Immunology, Charité Campus Benjamin Franklin, 12200 Berlin, Germany
- Correspondence:
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39
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Feng H, Kwun HJ, Liu X, Gjoerup O, Stolz DB, Chang Y, Moore PS. Cellular and viral factors regulating Merkel cell polyomavirus replication. PLoS One 2011; 6:e22468. [PMID: 21799863 PMCID: PMC3142164 DOI: 10.1371/journal.pone.0022468] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 06/22/2011] [Indexed: 12/13/2022] Open
Abstract
Merkel cell polyomavirus (MCV), a previously unrecognized component of the human viral skin flora, was discovered as a mutated and clonally-integrated virus inserted into Merkel cell carcinoma (MCC) genomes. We reconstructed a replicating MCV clone (MCV-HF), and then mutated viral sites required for replication or interaction with cellular proteins to examine replication efficiency and viral gene expression. Three days after MCV-HF transfection into 293 cells, although replication is not robust, encapsidated viral DNA and protein can be readily isolated by density gradient centrifugation and typical ∼40 nm diameter polyomavirus virions are identified by electron microscopy. The virus has an orderly gene expression cascade during replication in which large T (LT) and 57kT proteins are first expressed by day 2, followed by expression of small T (sT) and VP1 proteins. VP1 and sT proteins are not detected, and spliced 57kT is markedly diminished, in the replication-defective virus suggesting that early gene splicing and late gene transcription may be dependent on viral DNA replication. MCV replication and encapsidation is increased by overexpression of MCV sT, consistent with sT being a limiting factor during virus replication. Mutation of the MCV LT vacuolar sorting protein hVam6p (Vps39) binding site also enhances MCV replication while exogenous hVam6p overexpression reduces MCV virion production by >90%. Although MCV-HF generates encapsidated wild-type MCV virions, we did not find conditions for persistent transmission to recipient cell lines suggesting that MCV has a highly restricted tropism. These studies identify and highlight the role of polyomavirus DNA replication in viral gene expression and show that viral sT and cellular hVam6p are important factors regulating MCV replication. MCV-HF is a molecular clone that can be readily manipulated to investigate factors affecting MCV replication.
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Affiliation(s)
- Huichen Feng
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Hyun Jin Kwun
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Xi Liu
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Ole Gjoerup
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Donna B. Stolz
- Department of Cell Biology and Physiology, Center for Biologic Imaging, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Yuan Chang
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Patrick S. Moore
- Cancer Virology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
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Hoenerhoff MJ, Shibata MA, Bode A, Green JE. Pathologic progression of mammary carcinomas in a C3(1)/SV40 T/t-antigen transgenic rat model of human triple-negative and Her2-positive breast cancer. Transgenic Res 2011; 20:247-59. [PMID: 20549348 PMCID: PMC3103058 DOI: 10.1007/s11248-010-9406-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 05/19/2010] [Indexed: 12/25/2022]
Abstract
The C3(1) component of the rat prostate steroid binding protein has been used to target expression of the SV40 T/t-antigen to the mammary epithelium of mice resulting in pre-neoplastic lesions that progress to invasive and metastatic cancer with molecular features of human basal-type breast cancer. However, there are major differences in the histologic architecture of the stromal and epithelial elements between the mouse and human mammary glands. The rat mammary gland is more enriched with epithelial and stromal components than the mouse and more closely resembles the cellular composition of the human gland. Additionally, existing rat models of mammary cancer are typically estrogen receptor positive and hormone responsive, unlike most genetically engineered mouse mammary cancer models. In an attempt to develop a mammary cancer model that might more closely resemble the pathology of human breast cancer, we generated a novel C3(1)/SV40 T/t-antigen transgenic rat model that developed progressive mammary lesions leading to highly invasive adenocarcinomas. However, aggressive tumor development prevented the establishment of transgenic lines. Characterization of the tumors revealed that they were primarily estrogen receptor and progesterone receptor negative, and either her2/neu positive or negative, resembling human triple-negative or Her2 positive breast cancer. Tumors expressed the basal marker K14, as well as the luminal marker K18, and were negative for smooth muscle actin. The triple negative phenotype has not been previously reported in a rat mammary cancer model. Further development of a C3(1)SV40 T/t-antigen based model could establish valuable transgenic rat lines that develop basal-type mammary tumors.
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MESH Headings
- Adenocarcinoma/genetics
- Adenocarcinoma/pathology
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Breast Neoplasms/genetics
- Breast Neoplasms/pathology
- Disease Models, Animal
- Disease Progression
- Epithelial Cells/pathology
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/therapy
- Mice
- Rats
- Rats, Sprague-Dawley
- Rats, Transgenic
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/metabolism
- Transgenes/genetics
- Uteroglobin/genetics
- Uteroglobin/metabolism
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Affiliation(s)
- M J Hoenerhoff
- Transgenic Oncogenesis and Genomics Section, Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Institutes of Health, 37 Convent Drive, Building 37, Room 4054, Bethesda, MD 20892, USA
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41
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Chandok GS, Kapoor KK, Brick RM, Sidorova JM, Krasilnikova MM. A distinct first replication cycle of DNA introduced in mammalian cells. Nucleic Acids Res 2011; 39:2103-15. [PMID: 21062817 PMCID: PMC3064806 DOI: 10.1093/nar/gkq903] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 08/30/2010] [Accepted: 09/23/2010] [Indexed: 11/24/2022] Open
Abstract
Many mutation events in microsatellite DNA sequences were traced to the first embryonic divisions. It was not known what makes the first replication cycles of embryonic DNA different from subsequent replication cycles. Here we demonstrate that an unusual replication mode is involved in the first cycle of replication of DNA introduced in mammalian cells. This alternative replication starts at random positions, and occurs before the chromatin is fully assembled. It is detected in various cell lines and primary cells. The presence of single-stranded regions increases the efficiency of this alternative replication mode. The alternative replication cannot progress through the A/T-rich FRA16B fragile site, while the regular replication mode is not affected by it. A/T-rich microsatellites are associated with the majority of chromosomal breakpoints in cancer. We suggest that the alternative replication mode may be initiated at the regions with immature chromatin structure in embryonic and cancer cells resulting in increased genomic instability. This work demonstrates, for the first time, differences in the replication progression during the first and subsequent replication cycles in mammalian cells.
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Affiliation(s)
- Gurangad S. Chandok
- Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16801 and Department of Pathology, University of Washington, Seattle, WA 98195-7705 USA
| | - Kalvin K. Kapoor
- Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16801 and Department of Pathology, University of Washington, Seattle, WA 98195-7705 USA
| | - Rachel M. Brick
- Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16801 and Department of Pathology, University of Washington, Seattle, WA 98195-7705 USA
| | - Julia M. Sidorova
- Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16801 and Department of Pathology, University of Washington, Seattle, WA 98195-7705 USA
| | - Maria M. Krasilnikova
- Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16801 and Department of Pathology, University of Washington, Seattle, WA 98195-7705 USA
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Yang Y, Jiang B, Huo Y, Primo L, Dahl JS, Benjamin TL, Luo J. Shp2 suppresses PyMT-induced transformation in mouse fibroblasts by inhibiting Stat3 activity. Virology 2010; 409:204-10. [PMID: 21056449 DOI: 10.1016/j.virol.2010.09.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 07/28/2010] [Accepted: 09/29/2010] [Indexed: 12/30/2022]
Abstract
We have examined the effect of expression of the protein tyrosine phosphatase Shp2 on transformation by the mouse polyoma virus middle T antigen (PyMT). Gain-of-function mutations in Shp2 indicate that it may serve as an oncogene in several types of human leukemia. Paradoxically, however, some catalytically dominant-negative mutations of Shp2 have also been identified in leukemia and neuroblastomas. In this study, we show that Shp2 suppresses transformation induced by PyMT, the major polyoma viral oncoprotein known to act through binding and activation of pp60(c-src). Over-expression of a catalytically inactive Shp2 mutant in NIH3T3 cells significantly enhanced PyMT-induced transformation. Conversely, re-introduction of Shp2 into Shp2-deficient cells strongly inhibited PyMT-induced transformation and tumorigenesis. Short hairpin RNA (shRNA)-mediated Shp2 knockdown potentiated PyMT-induced transformation. Finally, we present evidence that the transformation-suppressive effects of Shp2 are mediated at least partially through the inhibition of signal transducers and activators of transcription 3.
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Affiliation(s)
- Ying Yang
- Laboratory of Vascular Biology, Institute of Molecular Medicine, Peking University, Beijing 100871, China.
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43
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Huang H, Zhao K, Arnett DR, Fanning E. A specific docking site for DNA polymerase {alpha}-primase on the SV40 helicase is required for viral primosome activity, but helicase activity is dispensable. J Biol Chem 2010; 285:33475-33484. [PMID: 20685648 PMCID: PMC2963361 DOI: 10.1074/jbc.m110.156240] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 07/31/2010] [Indexed: 11/06/2022] Open
Abstract
Replication of simian virus 40 (SV40) DNA, a model for eukaryotic chromosomal replication, can be reconstituted in vitro using the viral helicase (large tumor antigen, or Tag) and purified human proteins. Tag interacts physically with two cellular proteins, replication protein A and DNA polymerase α-primase (pol-prim), constituting the viral primosome. Like the well characterized primosomes of phages T7 and T4, this trio of proteins coordinates parental DNA unwinding with primer synthesis to initiate the leading strand at the viral origin and each Okazaki fragment on the lagging strand template. We recently determined the structure of a previously unrecognized pol-prim domain (p68N) that docks on Tag, identified the p68N surface that contacts Tag, and demonstrated its vital role in primosome function. Here, we identify the p68N-docking site on Tag by using structure-guided mutagenesis of the Tag helicase surface. A charge reverse substitution in Tag disrupted both p68N-binding and primosome activity but did not affect docking with other pol-prim subunits. Unexpectedly, the substitution also disrupted Tag ATPase and helicase activity, suggesting a potential link between p68N docking and ATPase activity. To assess this possibility, we examined the primosome activity of Tag with a single residue substitution in the Walker B motif. Although this substitution abolished ATPase and helicase activity as expected, it did not reduce pol-prim docking on Tag or primosome activity on single-stranded DNA, indicating that Tag ATPase is dispensable for primosome activity in vitro.
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Affiliation(s)
- Hao Huang
- From the Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235-1634
| | - Kun Zhao
- From the Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235-1634
| | - Diana R Arnett
- From the Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235-1634
| | - Ellen Fanning
- From the Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235-1634.
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Liu S, Hatton MP, Khandelwal P, Sullivan DA. Culture, immortalization, and characterization of human meibomian gland epithelial cells. Invest Ophthalmol Vis Sci 2010; 51:3993-4005. [PMID: 20335607 PMCID: PMC2910637 DOI: 10.1167/iovs.09-5108] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 02/22/2010] [Accepted: 02/26/2010] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Meibomian gland epithelial cells are essential in maintaining the health and integrity of the ocular surface. However, very little is known about their physiological regulation. In this study, the cellular control mechanisms were explored, first to establish a defined culture system for the maintenance of primary epithelial cells from human meibomian glands and, second, to immortalize these cells, thereby developing a preclinical model that could be used to identify factors that regulate cell activity. METHODS Human meibomian glands were removed from lid segments after surgery, enzymatically digested, and dissociated. Isolated epithelial cells were cultured in media with or without serum and/or 3T3 feeder layers. To attempt immortalization, the cells were exposed to retroviral human telomerase reverse transcriptase (hTERT) and/or SV40 large T antigen cDNA vectors, and antibiotic-resistant cells were selected, expanded, and subcultured. Analyses for possible biomarkers, cell proliferation and differentiation, lipid-related enzyme gene expression, and the cellular response to androgen were performed with biochemical, histologic, and molecular biological techniques. RESULTS It was possible to isolate viable human meibomian gland epithelial cells and to culture them in serum-free medium. These cells proliferated, survived through at least the fifth passage, and contained neutral lipids. Infection with hTERT immortalized these cells, which accumulated neutral lipids during differentiation, expressed multiple genes for lipogenic enzymes, responded to androgen, and continued to proliferate. CONCLUSIONS The results show that human meibomian gland epithelial cells may be isolated, cultured, and immortalized.
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Affiliation(s)
- Shaohui Liu
- From the Schepens Eye Research Institute and
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts; and
| | - Mark P. Hatton
- From the Schepens Eye Research Institute and
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts; and
- Ophthalmic Consultants of Boston, Boston, Massachusetts
| | - Payal Khandelwal
- From the Schepens Eye Research Institute and
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts; and
| | - David A. Sullivan
- From the Schepens Eye Research Institute and
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts; and
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45
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Liang S, Mele J, Wu Y, Buffenstein R, Hornsby PJ. Resistance to experimental tumorigenesis in cells of a long-lived mammal, the naked mole-rat (Heterocephalus glaber). Aging Cell 2010; 9:626-35. [PMID: 20550519 DOI: 10.1111/j.1474-9726.2010.00588.x] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The naked mole-rat (NMR, Heterocephalus glaber) is a long-lived mammal in which spontaneous cancer has not been observed. To investigate possible mechanisms for cancer resistance in this species, we studied the properties of skin fibroblasts from the NMR following transduction with oncogenes that cause cells of other mammalian species to form malignant tumors. Naked mole-rat fibroblasts were transduced with a retrovirus encoding SV40 large T antigen and oncogenic Ras(G12V). Following transplantation of transduced cells into immunodeficient mice, cells rapidly entered crisis, as evidenced by the presence of anaphase bridges, giant cells with enlarged nuclei, multinucleated cells, and cells with large number of chromosomes or abnormal chromatin material. In contrast, similarly transduced mouse and rat fibroblasts formed tumors that grew rapidly without crisis. Crisis was also observed after > 40 population doublings in SV40 TAg/Ras-expressing NMR cells in culture. Crisis in culture was prevented by additional infection of the cells with a retrovirus encoding hTERT (telomerase reverse transcriptase). SV40 TAg/Ras/hTERT-expressing NMR cells formed tumors that grew rapidly in immunodeficient mice without evidence of crisis. Crisis could also be induced in SV40 TAg/Ras-expressing NMR cells by loss of anchorage, but after hTERT transduction, cells were able to proliferate normally following loss of anchorage. Thus, rapid crisis is a response of oncogene-expressing NMR cells to growth in an in vivo environment, which requires anchorage independence, and hTERT permits cells to avoid crisis and to achieve malignant tumor growth. The unique reaction of NMR cells to oncogene expression may form part of the cancer resistance of this species.
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Affiliation(s)
- Sitai Liang
- Department of Physiology, University of Texas Health Science Center, San Antonio, TX 78245, USA
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Shi Y, Liu H, Gai D, Ma J, Chen XS. A computational analysis of ATP binding of SV40 large tumor antigen helicase motor. PLoS Comput Biol 2009; 5:e1000514. [PMID: 19779548 PMCID: PMC2739275 DOI: 10.1371/journal.pcbi.1000514] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Accepted: 08/25/2009] [Indexed: 11/25/2022] Open
Abstract
Simian Virus 40 Large Tumor Antigen (LTag) is an efficient helicase motor that unwinds and translocates DNA. The DNA unwinding and translocation of LTag is powered by ATP binding and hydrolysis at the nucleotide pocket between two adjacent subunits of an LTag hexamer. Based on the set of high-resolution hexameric structures of LTag helicase in different nucleotide binding states, we simulated a conformational transition pathway of the ATP binding process using the targeted molecular dynamics method and calculated the corresponding energy profile using the linear response approximation (LRA) version of the semi-macroscopic Protein Dipoles Langevin Dipoles method (PDLD/S). The simulation results suggest a three-step process for the ATP binding from the initial interaction to the final tight binding at the nucleotide pocket, in which ATP is eventually “locked” by three pairs of charge-charge interactions across the pocket. Such a “cross-locking” ATP binding process is similar to the binding zipper model reported for the F1-ATPase hexameric motor. The simulation also shows a transition mechanism of Mg2+ coordination to form the Mg-ATP complex during ATP binding, which is accompanied by the large conformational changes of LTag. This simulation study of the ATP binding process to an LTag and the accompanying conformational changes in the context of a hexamer leads to a refined cooperative iris model that has been proposed previously. The Large Tumor antigen (LTag) encoded by Simian Virus 40 (SV40) is a marvelous molecule that is not only a viral oncogene, but also an efficient molecular machine as a helicase that unwinds double helix DNA for genome replication, an essential process in all living organisms. LTag hexameric helicase uses the energy of ATP to power its conformational switch for DNA unwinding. Understanding how the LTag conformational switch is coupled to the energy from ATP usage by LTag to do the mechanical work of unwinding DNA is of great interest to biologists, and yet remains to be established. Based on our previous high-resolution structures of LTag helicase in different conformational states, we simulated an LTag conformational transition pathway in the ATP binding process using the targeted molecular dynamics method. Our simulation results suggest a three-step process for the ATP binding to the nucleotide pocket, in which ATP is eventually “locked” into the pocket by three pairs of “locker” interactions. We have also quantitatively evaluated the energy profile of ATP binding using a special computational simulation technique. Additionally, our simulation study of ATP binding by LTag and the accompanying conformational switches in the context of a hexamer leads to a refined cooperative iris model that may be used for DNA unwinding.
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Affiliation(s)
- Yemin Shi
- Molecular and Computational Biology, University of Southern California, Los Angeles, California, United States of America
| | - Hanbin Liu
- Chemistry Department, University of Southern California, Los Angeles, California, United States of America
| | - Dahai Gai
- Molecular and Computational Biology, University of Southern California, Los Angeles, California, United States of America
| | - Jianpeng Ma
- Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Bioengineering, Rice University, Houston, Texas, United States of America
| | - Xiaojiang S. Chen
- Molecular and Computational Biology, University of Southern California, Los Angeles, California, United States of America
- Chemistry Department, University of Southern California, Los Angeles, California, United States of America
- * E-mail:
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Abstract
Background To obtain non-relative measures of cell proteins, purified preparations of the same proteins are used as standards in Western blots. We have previously quantified SV40 large T antigen expressed over a several fold range in different cell lines and correlated the average number of molecules to average fluorescence obtained by cytometry and determined cell cycle phase related expression by calculation from multi-parametric cytometry data. Using a modified approach, we report quantification of endogenous cyclin B1 and generation of the cell cycle time related expression profile. Methodology Recombinant cyclin B1 was purified from a baculovirus lysate using an antibody affinity column and concentrated. We created fixed cell preparations from nocodazole-treated (high cyclin B1) and serum starved (low cyclin B1) PC3 cells that were either lyophilized (for preservation) or solubilized. The lysates and purified cyclin B1 were subjected to Western blotting; the cell preparations were subjected to cytometry, and fluorescence was correlated to molecules. Three untreated cell lines (K562, HeLa, and RKO) were prepared for cytometry without lyophilization and also prepared for Western blotting. These were quantified by Western blotting and by cytometry using the standard cell preparations. Results The standard cell preparations had 1.5×105 to 2.5×106 molecules of cyclin B1 per cell on average (i.e., 16-fold range). The average coefficient of variation was 24%. Fluorescence varied 12-fold. The relationship between molecules/cell (Western blot) and immunofluorescence (cytometry) was linear (r2 = 0.87). Average cyclin B1 levels for the three untreated cell lines determined by Western blotting and cytometry agreed within a factor of 2. The non-linear rise in cyclin B1 in S phase was quantified from correlated plots of cyclin B1 and DNA content. The peak levels achieved in G2 were similar despite differences in lineage, growth conditions, and rates of increase through the cell cycle (range: 1.6–2.2×106 molecules per cell). Conclusions Net cyclin B1 expression begins in G1 in human somatic cells lines; increases non-linearly with variation in rates of accumulation, but peaks at similar peak values in different cell lines growing under different conditions. This suggests tight quantitative end point control.
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Affiliation(s)
- Phyllis S. Frisa
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - James W. Jacobberger
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, Ohio, United States of America
- * E-mail:
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Du YCN, Klimstra DS, Varmus H. Activation of PyMT in beta cells induces irreversible hyperplasia, but oncogene-dependent acinar cell carcinomas when activated in pancreatic progenitors. PLoS One 2009; 4:e6932. [PMID: 19812721 PMCID: PMC2758666 DOI: 10.1371/journal.pone.0006932] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Accepted: 08/06/2009] [Indexed: 12/31/2022] Open
Abstract
It is unclear whether the cellular origin of various forms of pancreatic cancer involves transformation or transdifferentiation of different target cells or whether tumors arise from common precursors, with tumor types determined by the specific genetic alterations. Previous studies suggested that pancreatic ductal carcinomas might be induced by polyoma middle T antigen (PyMT) expressed in non-ductal cells. To ask whether PyMT transforms and transdifferentiates endocrine cells toward exocrine tumor phenotypes, we generated transgenic mice that carry tetracycline-inducible PyMT and a linked luciferase reporter. Induction of PyMT in β cells causes β-cell hyperplastic lesions that do not progress to malignant neoplasms. When PyMT is de-induced, β cell proliferation and growth cease; however, regression does not occur, suggesting that continued production of PyMT is not required to maintain the viable expanded β cell population. In contrast, induction of PyMT in early pancreatic progenitor cells under the control of Pdx1 produces acinar cell carcinomas and β-cell hyperplasia. The survival of acinar tumor cells is dependent on continued expression of PyMT. Our findings indicate that PyMT can induce exocrine tumors from pancreatic progenitor cells, but cells in the β cell lineage are not transdifferentiated toward exocrine cell types by PyMT; instead, they undergo oncogene-dependent hyperplastic growth, but do not require PyMT for survival.
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Affiliation(s)
- Yi-Chieh Nancy Du
- Program in Cancer Biology and Genetics, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.
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Abstract
The small DNA tumor viruses have provided a very long-lived source of insights into many aspects of the life cycle of eukaryotic cells. In recent years, the emphasis has been on cancer-related signaling. Here we review murine polyomavirus middle T antigen, its mechanisms, and its downstream pathways of transformation. We concentrate on the MMTV-PyMT transgenic mouse, one of the most studied models of breast cancer, which permits the examination of in situ tumor progression from hyperplasia to metastasis.
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Affiliation(s)
- Michele M Fluck
- Department of Microbiology and Molecular Genetics, Interdepartmental Program in Cell and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA.
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50
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Abstract
Nuclear protein transport processes have largely been studied using in vitro semi-intact cell systems where high concentrations of nuclear localizing substrates are used, and cytoplasmic components such as the microtubule (MT) network, are either absent or damaged. Here we use the fluorescence recovery after photobleaching (FRAP) technique to analyze the nucleocytoplasmic flux of distinct fluorescently tagged proteins over time in living cultured cells. FRAP was performed in different parts of the cell to analyze the kinetics of nucleocytoplasmic trafficking and intranuclear/cytoplasmic mobility of the tumor suppressor Rb protein and a SV40 large tumor antigen (T-ag) derivative containing the nuclear localization sequence (NLS), both fused to green fluorescent protein (GFP). The results indicate that proteins carrying the T-ag NLS are highly mobile in the nucleus and cytoplasm. Rb, in contrast, is largely immobile in both cellular compartments, with similar nuclear import and export kinetics. Rb nuclear export was CRM-1-mediated, with its reduced mobility in the cytoplasm in part due to association with MTs. Overall our results show that nuclear and cytoplasm retention modulates the rates of nuclear protein import and export in intact cells.
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Affiliation(s)
- Daniela M Roth
- Nuclear Signalling Laboratory, Department of Biochemistry and Molecular Biology, Monash University, Monash, Victoria 3800, Australia
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