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Singh GB, Byun H, Ali AF, Medina F, Wylie D, Shivram H, Nash AK, Lozano MM, Dudley JP. A Protein Antagonist of Activation-Induced Cytidine Deaminase Encoded by a Complex Mouse Retrovirus. mBio 2019; 10:e01678-19. [PMID: 31409681 PMCID: PMC6692512 DOI: 10.1128/mbio.01678-19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 06/26/2019] [Accepted: 07/08/2019] [Indexed: 01/27/2023] Open
Abstract
Complex human-pathogenic retroviruses cause high morbidity and mortality worldwide, but resist antiviral drugs and vaccine development due to evasion of the immune response. A complex retrovirus, mouse mammary tumor virus (MMTV), requires replication in B and T lymphocytes for mammary gland transmission and is antagonized by the innate immune restriction factor murine Apobec3 (mA3). To determine whether the regulatory/accessory protein Rem affects innate responses to MMTV, a splice-donor mutant (MMTV-SD) lacking Rem expression was injected into BALB/c mice. Mammary tumors induced by MMTV-SD had a lower proviral load, lower incidence, and longer latency than mammary tumors induced by wild-type MMTV (MMTV-WT). MMTV-SD proviruses had many G-to-A mutations on the proviral plus strand, but also C-to-T transitions within WRC motifs. Similarly, a lymphomagenic MMTV variant lacking Rem expression showed decreased proviral loads and increased WRC motif mutations relative to those in wild-type-virus-induced tumors, consistent with activation-induced cytidine deaminase (AID) mutagenesis in lymphoid cells. These mutations are typical of the Apobec family member AID, a B-cell-specific mutagenic protein involved in antibody variable region hypermutation. In contrast, mutations in WRC motifs and proviral loads were similar in MMTV-WT and MMTV-SD proviruses from tumors in AID-insufficient mice. AID was not packaged in MMTV virions. Rem coexpression in transfection experiments led to AID proteasomal degradation. Our data suggest that rem specifies a human-pathogenic immunodeficiency virus type 1 (HIV-1) Vif-like protein that inhibits AID and antagonizes innate immunity during MMTV replication in lymphocytes.IMPORTANCE Complex retroviruses, such as human-pathogenic immunodeficiency virus type 1 (HIV-1), cause many human deaths. These retroviruses produce lifelong infections through viral proteins that interfere with host immunity. The complex retrovirus mouse mammary tumor virus (MMTV) allows for studies of host-pathogen interactions not possible in humans. A mutation preventing expression of the MMTV Rem protein in two different MMTV strains decreased proviral loads in tumors and increased viral genome mutations typical of an evolutionarily ancient enzyme, AID. Although the presence of AID generally improves antibody-based immunity, it may contribute to human cancer progression. We observed that coexpression of MMTV Rem and AID led to AID destruction. Our results suggest that Rem is the first known protein inhibitor of AID and that further experiments could lead to new disease treatments.
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Affiliation(s)
- Gurvani B Singh
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Hyewon Byun
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Almas F Ali
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Frank Medina
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Dennis Wylie
- Computational Biology and Bioinformatics and Center for Biomedical Research Support, The University of Texas at Austin, Austin, Texas, USA
| | - Haridha Shivram
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Andrea K Nash
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Mary M Lozano
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
| | - Jaquelin P Dudley
- Dept. of Molecular Biosciences, LaMontagne Center for Infectious Disease, and Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA
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2
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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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3
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Meiser J, Schuster A, Pietzke M, Vande Voorde J, Athineos D, Oizel K, Burgos-Barragan G, Wit N, Dhayade S, Morton JP, Dornier E, Sumpton D, Mackay GM, Blyth K, Patel KJ, Niclou SP, Vazquez A. Increased formate overflow is a hallmark of oxidative cancer. Nat Commun 2018; 9:1368. [PMID: 29636461 PMCID: PMC5893600 DOI: 10.1038/s41467-018-03777-w] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [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: 12/01/2017] [Accepted: 03/09/2018] [Indexed: 11/09/2022] Open
Abstract
Formate overflow coupled to mitochondrial oxidative metabolism\ has been observed in cancer cell lines, but whether that takes place in the tumor microenvironment is not known. Here we report the observation of serine catabolism to formate in normal murine tissues, with a relative rate correlating with serine levels and the tissue oxidative state. Yet, serine catabolism to formate is increased in the transformed tissue of in vivo models of intestinal adenomas and mammary carcinomas. The increased serine catabolism to formate is associated with increased serum formate levels. Finally, we show that inhibition of formate production by genetic interference reduces cancer cell invasion and this phenotype can be rescued by exogenous formate. We conclude that increased formate overflow is a hallmark of oxidative cancers and that high formate levels promote invasion via a yet unknown mechanism.
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MESH Headings
- Adenoma/genetics
- Adenoma/metabolism
- Adenoma/pathology
- Animals
- Antimetabolites, Antineoplastic/pharmacology
- Cell Line, Tumor
- Female
- Formates/metabolism
- Formates/pharmacology
- Gene Expression Regulation, Neoplastic
- Glycine Hydroxymethyltransferase/genetics
- Glycine Hydroxymethyltransferase/metabolism
- Intestinal Mucosa/metabolism
- Intestinal Neoplasms/genetics
- Intestinal Neoplasms/metabolism
- Intestinal Neoplasms/pathology
- Intestines/pathology
- Isoenzymes/genetics
- Isoenzymes/metabolism
- Male
- Mammary Glands, Animal/metabolism
- Mammary Glands, Animal/pathology
- Mammary Glands, Animal/virology
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/pathogenicity
- Methotrexate/pharmacology
- Mice
- Mice, Inbred C57BL
- Mitochondria/drug effects
- Mitochondria/metabolism
- Oxidation-Reduction
- Serine/metabolism
- Tumor Microenvironment/drug effects
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Affiliation(s)
| | - Anne Schuster
- Department of Oncology, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health, L-1526, Luxembourg, Luxembourg
| | | | | | | | - Kristell Oizel
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK
| | | | - Niek Wit
- MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK
| | | | - Jennifer P Morton
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK
- Institute for Cancer Sciences, University of Glasgow, G61 1BD, Glasgow, UK
| | | | - David Sumpton
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK
| | | | - Karen Blyth
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK
| | - Ketan J Patel
- MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK
- Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, CB2 2QQ, UK
| | - Simone P Niclou
- Department of Oncology, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health, L-1526, Luxembourg, Luxembourg
- Department of Biomedicine, Kristian Gerhard Jebsen Brain Tumour Research Center, University of Bergen, Bergen, N-5009, Norway
| | - Alexei Vazquez
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK.
- Institute for Cancer Sciences, University of Glasgow, G61 1BD, Glasgow, UK.
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4
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Sarvi S, Patel H, Li J, Dodd GL, Creedon H, Muir M, Ward J, Dawson JC, Lee M, Culley J, Salter DM, Sims AH, Byron A, Brunton VG. Kindlin-1 Promotes Pulmonary Breast Cancer Metastasis. Cancer Res 2018; 78:1484-1496. [PMID: 29330144 PMCID: PMC5857359 DOI: 10.1158/0008-5472.can-17-1518] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 05/26/2017] [Revised: 10/30/2017] [Accepted: 01/08/2018] [Indexed: 11/16/2022]
Abstract
In breast cancer, increased expression of the cytoskeletal adaptor protein Kindlin-1 has been linked to increased risks of lung metastasis, but the functional basis is unknown. Here, we show that in a mouse model of polyomavirus middle T antigen-induced mammary tumorigenesis, loss of Kindlin-1 reduced early pulmonary arrest and later development of lung metastasis. This phenotype relied on the ability of Kindlin-1 to bind and activate β integrin heterodimers. Kindlin-1 loss reduced α4 integrin-mediated adhesion of mammary tumor cells to the adhesion molecule VCAM-1 on endothelial cells. Treating mice with an anti-VCAM-1 blocking antibody prevented early pulmonary arrest. Kindlin-1 loss also resulted in reduced secretion of several factors linked to metastatic spread, including the lung metastasis regulator tenascin-C, showing that Kindlin-1 regulated metastatic dissemination by an additional mechanism in the tumor microenvironment. Overall, our results show that Kindlin-1 contributes functionally to early pulmonary metastasis of breast cancer.Significance: These findings provide a mechanistic proof in mice that Kindin-1, an integrin-binding adaptor protein, is a critical mediator of early lung metastasis of breast cancer. Cancer Res; 78(6); 1484-96. ©2018 AACR.
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Affiliation(s)
- Sana Sarvi
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Hitesh Patel
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Jun Li
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Georgia L Dodd
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Helen Creedon
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Morwenna Muir
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Jocelyn Ward
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - John C Dawson
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Martin Lee
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Jayne Culley
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Donald M Salter
- Centre for Genomic & Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Andrew H Sims
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Adam Byron
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Valerie G Brunton
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, United Kingdom.
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5
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Cremers N, Neeb A, Uhle T, Dimmler A, Rothley M, Allgayer H, Fodde R, Sleeman JP, Thiele W. CD24 Is Not Required for Tumor Initiation and Growth in Murine Breast and Prostate Cancer Models. PLoS One 2016; 11:e0151468. [PMID: 26978528 PMCID: PMC4792398 DOI: 10.1371/journal.pone.0151468] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 05/08/2015] [Accepted: 02/29/2016] [Indexed: 12/03/2022] Open
Abstract
CD24 is a small, heavily glycosylated, GPI-linked membrane protein, whose expression has been associated with the tumorigenesis and progression of several types of cancer. Here, we studied the expression of CD24 in tumors of MMTV-PyMT, Apc1572/T+ and TRAMP genetic mouse models that spontaneously develop mammary or prostate carcinoma, respectively. We found that CD24 is expressed during tumor development in all three models. In MMTV-PyMT and Apc1572T/+ breast tumors, CD24 was strongly but heterogeneously expressed during early tumorigenesis, but decreased in more advanced stages, and accordingly was increased in poorly differentiated lesions compared with well differentiated lesions. In prostate tumors developing in TRAMP mice, CD24 expression was strong within hyperplastic lesions in comparison with non-hyperplastic regions, and heterogeneous CD24 expression was maintained in advanced prostate carcinomas. To investigate whether CD24 plays a functional role in tumorigenesis in these models, we crossed CD24 deficient mice with MMTV-PyMT, Apc1572T/+ and TRAMP mice, and assessed the influence of CD24 deficiency on tumor onset and tumor burden. We found that mice negative or positive for CD24 did not significantly differ in terms of tumor initiation and burden in the genetic tumor models tested, with the exception of Apc1572T/+ mice, in which lack of CD24 reduced the mammary tumor burden slightly but significantly. Together, our data suggest that while CD24 is distinctively expressed during the early development of murine mammary and prostate tumors, it is not essential for the formation of tumors developing in MMTV-PyMT, Apc1572T/+ and TRAMP mice.
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MESH Headings
- Animals
- CD24 Antigen/genetics
- CD24 Antigen/physiology
- Cell Differentiation
- Cell Transformation, Neoplastic/genetics
- Female
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Neoplastic
- Genes, APC
- Male
- Mammary Glands, Animal/pathology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Models, Animal
- Neoplastic Syndromes, Hereditary/etiology
- Neoplastic Syndromes, Hereditary/genetics
- Prostate/pathology
- Prostatic Neoplasms/genetics
- Retroviridae Infections/genetics
- Seminal Vesicles/pathology
- Tumor Virus Infections/genetics
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Affiliation(s)
- Natascha Cremers
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
| | - Antje Neeb
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
| | - Tanja Uhle
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
| | - Arno Dimmler
- Institut und Gemeinschaftspraxis für Pathologie an den St. Vincentiuskliniken Karlsruhe, Karlsruhe, Germany
| | - Melanie Rothley
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
| | - Heike Allgayer
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
| | - Riccardo Fodde
- Department of Pathology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Jonathan Paul Sleeman
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
| | - Wilko Thiele
- University of Heidelberg, Medical Faculty Mannheim, Mannheim, Germany
- Karlsruhe Institute of Technology, Institut für Toxikologie und Genetik, Karlsruhe, Germany
- * E-mail:
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6
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Ma Z, Blackwelder AJ, Lee H, Zhao M, Yang X. In Utero exposure to low-dose alcohol induces reprogramming of mammary development and tumor risk in MMTV-erbB-2 transgenic mice. Int J Mol Sci 2015; 16:7655-71. [PMID: 25853264 PMCID: PMC4425041 DOI: 10.3390/ijms16047655] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 03/30/2015] [Accepted: 03/30/2015] [Indexed: 12/20/2022] Open
Abstract
There is increasing evidence that prenatal exposure to environmental factors may modify breast cancer risk later in life. This study aimed to investigate the effects of in utero exposure to low-dose alcohol on mammary development and tumor risk. Pregnant MMTV-erbB-2 mice were exposed to alcohol (6 g/kg/day) between day 13 and day 19 of gestation, and the female offspring were examined for tumor risk. Whole mount analysis indicated that in utero exposure to low-dose alcohol induced significant increases in ductal extension at 10 weeks of age. Molecular analysis showed that in utero alcohol exposure induced upregulation of ERα signaling and activation of Akt and Erk1/2 in pubertal mammary glands. However, enhanced signaling in the EGFR/erbB-2 pathway appeared to be more prominent in 10-week-old glands than did signaling in the other pathways. Interestingly, tumor development in mice with in utero exposure to low-dose alcohol was slightly delayed compared to control mice, but tumor multiplicity was increased. The results indicate that in utero exposure to low-dose alcohol induces the reprogramming of mammary development by mechanisms that include altered signaling in the estrogen receptor (ER) and erbB-2 pathways. The intriguing tumor development pattern might be related to alcohol dose and exposure conditions, and warrants further investigation.
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MESH Headings
- Animals
- Cell Transformation, Viral/genetics
- Estrogen Receptor alpha/metabolism
- Ethanol/pharmacology
- Ethanol/toxicity
- Female
- Fetus/drug effects
- Mammary Glands, Animal/drug effects
- Mammary Glands, Animal/growth & development
- Mammary Glands, Animal/pathology
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/pathogenicity
- Mice
- Mice, Transgenic
- Pregnancy
- Prenatal Exposure Delayed Effects/chemically induced
- Prenatal Exposure Delayed Effects/pathology
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/metabolism
- Signal Transduction/drug effects
- Up-Regulation
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Affiliation(s)
- Zhikun Ma
- Julius L. Chambers Biomedical/Biotechnology Research Institute and Department of Biology, North Carolina Central University, Kannapolis, NC 28081, USA.
| | - Amanda J Blackwelder
- Julius L. Chambers Biomedical/Biotechnology Research Institute and Department of Biology, North Carolina Central University, Kannapolis, NC 28081, USA.
| | - Harry Lee
- Julius L. Chambers Biomedical/Biotechnology Research Institute and Department of Biology, North Carolina Central University, Kannapolis, NC 28081, USA.
| | - Ming Zhao
- Julius L. Chambers Biomedical/Biotechnology Research Institute and Department of Biology, North Carolina Central University, Kannapolis, NC 28081, USA.
| | - Xiaohe Yang
- Julius L. Chambers Biomedical/Biotechnology Research Institute and Department of Biology, North Carolina Central University, Kannapolis, NC 28081, USA.
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7
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Ma J, Lanza DG, Guest I, Uk-Lim C, Glinskii A, Glinsky G, Sell S. Characterization of mammary cancer stem cells in the MMTV-PyMT mouse model. Tumour Biol 2012; 33:1983-96. [PMID: 22878936 DOI: 10.1007/s13277-012-0458-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Accepted: 07/04/2012] [Indexed: 11/26/2022] Open
Abstract
Breast cancer stem cells, the root of tumor growth, present challenges to investigate: Primary human breast cancer cells are difficult to establish in culture and inconsistently yield tumors after transplantation into immune-deficient recipient mice. Furthermore, there is limited characterization of mammary cancer stem cells in mice, the ideal model for the study of breast cancer. We herein describe a pre-clinical breast cancer stem cell model, based on the properties of cancer stem cells, derived from transgenic MMTV-PyMT mice. Using a defined set of cell surface markers to identify cancer stem cells by flow cytometry, at least four cell populations were recovered from primary mammary cancers. Only two of the four populations, one epithelial and one mesenchymal, were able to survive and proliferate in vitro. The epithelial population exhibited tumor initiation potential with as few as 10 cells injected into syngeneic immune-competent recipients. Tumors initiated from injected cell lines recapitulated the morphological and physiological components of the primary tumor. To highlight the stemness potential of the putative cancer stem cells, B lymphoma Mo-MLV insertion region 1 homolog (Bmi-1) expression was knocked down via shRNA targeting Bmi-1. Without Bmi-1 expression, putative cancer stem cells could no longer initiate tumors, but tumor initiation was rescued with the introduction of a Bmi-1 overexpression vector in the Bmi-1 knockdown cells. In conclusion, our data show that primary mammary cancers from MMTV-PyMT mice contain putative cancer stem cells that survive in culture and can be used to create a model for study of mammary cancer stem cells.
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Affiliation(s)
- Jun Ma
- Translational and Functional Genomics Laboratory, Ordway Research Institute, Albany, NY 12208, USA
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8
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Abstract
INTRODUCTION The initial clinical experience from targeted therapy for breast cancer has been mixed. While important progress has been made in the care of a subset of patients characterized by amplification of HER2 through the use of trastuzumab, other targeted therapies have failed to improve the outcome for large, unselected groups of patients. Thus, efforts to find prognostic or predictive biomarkers to enable tailored therapy are highly warranted. Genetically engineered mouse models of human cancer provide a convenient setting in which to perform explorative studies. However, there is a paucity of comparative studies between mouse and human tumours in order to validate the use of mouse models as discovery tools. MATERIALS AND METHODS Here, we have compared the localization of markers for cancer-associated fibroblasts in the MMTV-PyMT mouse model of mammary carcinoma with that of human breast cancer. The expression of α-smooth muscle actin, platelet-derived growth factor receptor-α, and fibroblast-specific protein-1 was assessed by immunostaining of sections from tumours of MMTV-PyMT mice. Information about the distribution of the same markers in human breast cancer was derived from the publicly available database the Human Protein Atlas. RESULTS Both mouse and human mammary carcinomas were infused by a rich fibrotic stroma. While no marker was capable of identifying all stromal fibroblasts, the expression pattern of each marker was remarkably similar in mouse and human. DISCUSSION We conclude that the MMTV-PyMT mouse model of breast cancer will have utility as a discovery tool for biomarkers of cancer-associated fibroblasts during malignant conversion.
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Affiliation(s)
- Pernilla Roswall
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Kristian Pietras
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institutet, Stockholm, Sweden
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9
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Hirner H, Günes C, Bischof J, Wolff S, Grothey A, Kühl M, Oswald F, Wegwitz F, Bösl MR, Trauzold A, Henne-Bruns D, Peifer C, Leithäuser F, Deppert W, Knippschild U. Impaired CK1 delta activity attenuates SV40-induced cellular transformation in vitro and mouse mammary carcinogenesis in vivo. PLoS One 2012; 7:e29709. [PMID: 22235331 PMCID: PMC3250488 DOI: 10.1371/journal.pone.0029709] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 12/01/2011] [Indexed: 02/05/2023] Open
Abstract
Simian virus 40 (SV40) is a powerful tool to study cellular transformation in vitro, as well as tumor development and progression in vivo. Various cellular kinases, among them members of the CK1 family, play an important role in modulating the transforming activity of SV40, including the transforming activity of T-Ag, the major transforming protein of SV40, itself. Here we characterized the effects of mutant CK1δ variants with impaired kinase activity on SV40-induced cell transformation in vitro, and on SV40-induced mammary carcinogenesis in vivo in a transgenic/bi-transgenic mouse model. CK1δ mutants exhibited a reduced kinase activity compared to wtCK1δ in in vitro kinase assays. Molecular modeling studies suggested that mutation N172D, located within the substrate binding region, is mainly responsible for impaired mutCK1δ activity. When stably over-expressed in maximal transformed SV-52 cells, CK1δ mutants induced reversion to a minimal transformed phenotype by dominant-negative interference with endogenous wtCK1δ. To characterize the effects of CK1δ on SV40-induced mammary carcinogenesis, we generated transgenic mice expressing mutant CK1δ under the control of the whey acidic protein (WAP) gene promoter, and crossed them with SV40 transgenic WAP-T-antigen (WAP-T) mice. Both WAP-T mice as well as WAP-mutCK1δ/WAP-T bi-transgenic mice developed breast cancer. However, tumor incidence was lower and life span was significantly longer in WAP-mutCK1δ/WAP-T bi-transgenic animals. The reduced CK1δ activity did not affect early lesion formation during tumorigenesis, suggesting that impaired CK1δ activity reduces the probability for outgrowth of in situ carcinomas to invasive carcinomas. The different tumorigenic potential of SV40 in WAP-T and WAP-mutCK1δ/WAP-T tumors was also reflected by a significantly different expression of various genes known to be involved in tumor progression, specifically of those involved in wnt-signaling and DNA repair. Our data show that inactivating mutations in CK1δ impair SV40-induced cellular transformation in vitro and mouse mammary carcinogenesis in vivo.
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MESH Headings
- Animals
- Antigens, Viral, Tumor/immunology
- Casein Kinase Idelta/chemistry
- Casein Kinase Idelta/genetics
- Casein Kinase Idelta/metabolism
- Cell Line
- Cell Line, Tumor
- Cell Transformation, Viral/genetics
- Disease Progression
- Female
- Gene Expression Regulation
- Male
- Mammary Glands, Animal/metabolism
- Mammary Glands, Animal/pathology
- Mammary Glands, Animal/virology
- Mammary Neoplasms, Experimental/enzymology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mice
- Mice, Inbred BALB C
- Mice, Transgenic
- Milk Proteins/genetics
- Models, Molecular
- Mutation
- Phenotype
- Phosphorylation
- Promoter Regions, Genetic/genetics
- Protein Structure, Tertiary
- Simian virus 40/immunology
- Simian virus 40/physiology
- Survival Analysis
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Affiliation(s)
- Heidrun Hirner
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
| | - Cagatay Günes
- Institute of Molecular Medicine and Max-Planck-Research Group on Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Joachim Bischof
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
| | - Sonja Wolff
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
| | - Arnhild Grothey
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
| | - Marion Kühl
- Department of Tumor Virology, Heinrich-Pette-Institute, Leibniz-Center for Experimental Virology, Hamburg, Germany
| | - Franz Oswald
- Department of Internal Medicine I, University of Ulm, Ulm, Germany
| | - Florian Wegwitz
- Department of Tumor Virology, Heinrich-Pette-Institute, Leibniz-Center for Experimental Virology, Hamburg, Germany
| | - Michael R. Bösl
- Max Planck Institute of Neurobiology Transgenic Mouse Models, Max Planck Institute, Martinsried, Germany
| | - Anna Trauzold
- Division of Molecular Oncology, Institute for Experimental Cancer Research, CCCNorth, UK S-H, Kiel, Germany
| | - Doris Henne-Bruns
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
| | | | | | - Wolfgang Deppert
- Department of Tumor Virology, Heinrich-Pette-Institute, Leibniz-Center for Experimental Virology, Hamburg, Germany
| | - Uwe Knippschild
- Department of General-, Visceral- and Transplantation Surgery, University of Ulm, Ulm, Germany
- * E-mail:
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10
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Abstract
The Adenomatous Polyposis Coli (APC) tumor suppressor gene is silenced by hypermethylation or mutated in up to 70% of human breast cancers. In mouse models, Apc mutation disrupts normal mammary development and predisposes to mammary tumor formation; however, the cooperation between APC and other mutations in breast tumorigenesis has not been studied. To test the hypothesis that loss of one copy of APC promotes oncogene-mediated mammary tumorigenesis, ApcMin/+ mice were crossed with the mouse mammary tumor virus (MMTV)-Polyoma virus middle T antigen (PyMT) or MMTV-c-Neu transgenic mice. In the PyMT tumor model, the ApcMin/+ mutation significantly decreased survival and tumor latency, promoted a squamous adenocarcinoma phenotype, and enhanced tumor cell proliferation. In tumor-derived cell lines, the proliferative advantage was a result of increased FAK, Src and JNK signaling. These effects were specific to the PyMT model, as no changes were observed in MMTV-c-Neu mice carrying the ApcMin/+ mutation. Our data indicate that heterozygosity of Apc enhances tumor development in an oncogene-specific manner, providing evidence that APC-dependent pathways may be valuable therapeutic targets in breast cancer. Moreover, these preclinical model systems offer a platform for dissection of the molecular mechanisms by which APC mutation enhances breast carcinogenesis, such as altered FAK/Src/JNK signaling.
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Affiliation(s)
- Jenifer R. Prosperi
- Department of Surgery, University of Chicago, Chicago, Illinois, United States of America
| | - Andrey I. Khramtsov
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Galina F. Khramtsova
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Kathleen H. Goss
- Department of Surgery, University of Chicago, Chicago, Illinois, United States of America
- * E-mail:
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11
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Medina D. Of mice and women: A short history of mouse mammary cancer research with an emphasis on the paradigms inspired by the transplantation method. Cold Spring Harb Perspect Biol 2010; 2:a004523. [PMID: 20630995 PMCID: PMC2944362 DOI: 10.1101/cshperspect.a004523] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The ability to transplant mammary epithelial cells of any age or developmental stage to the normal anatomical site of an inbred recipient mouse strain has revolutionized the studies of mammary development and tumor biology over the past 50 years. This simple method has made the mammary gland of the rodent one of the most accessible and studied organs and facilitated our understanding of the fundamental cellular and molecular properties of normal and neoplastic development. This short review outlines the early concepts that led to the development of the transplantation technology and the impact of this method on our understanding for a variety of processes important both for the normal development and differentiation of the gland as well as the phenomena of neoplastic progression.
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Affiliation(s)
- Daniel Medina
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
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12
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Martin MD, Kremers GJ, Short KW, Rocheleau JV, Xu L, Piston DW, Matrisian LM, Gorden DL. Rapid extravasation and establishment of breast cancer micrometastases in the liver microenvironment. Mol Cancer Res 2010; 8:1319-27. [PMID: 20724460 DOI: 10.1158/1541-7786.mcr-09-0551] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [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: 01/01/2023]
Abstract
To examine the interplay between tumor cells and the microenvironment during early breast cancer metastasis, we developed a technique for ex vivo imaging of murine tissue explants using two-photon microscopy. Cancer cells in the liver and the lung were compared by imaging both organs at specific time points after the injection of the same polyomavirus middle T-initiated murine mammary tumor cell line. Extravasation was greatly reduced in the lung compared with the liver, with 56% of tumor cells in the liver having extravasated by 24 hours, compared with only 22% of tumor cells in the lung that have extravasated. In the liver, imaged cells continually transitioned from an intravascular location to an extravascular site, whereas in the lung, extravasation rates slowed after 6 hours. Within the liver microenvironment, the average size of the imaged micrometastatic lesions increased 4-fold between days 5 and 12. Histologic analysis of these lesions determined that by day 12, the micrometastases were heterogeneous, consisting of both tumor cells and von Willebrand factor-positive endothelial cells. Further analysis with intravenously administered lectin indicated that vessels within the micrometastatic tumor foci were patent by day 12. These data present the use of two-photon microscopy to directly compare extravasation times in metastatic sites using the same tumor cell line and highlight the differences in early events and metastatic patterns between two important secondary sites of breast cancer progression with implications for future therapy.
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Affiliation(s)
- Michelle D Martin
- Department of Cancer Biology, Vanderbilt University, Nashville, TN 37212, USA.
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13
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Cadieux C, Kedinger V, Yao L, Vadnais C, Drossos M, Paquet M, Nepveu A. Mouse mammary tumor virus p75 and p110 CUX1 transgenic mice develop mammary tumors of various histologic types. Cancer Res 2009; 69:7188-97. [PMID: 19738070 DOI: 10.1158/0008-5472.can-08-4899] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The p75 and p110 isoforms of the CUX1 homeodomain protein are overexpressed in breast tumors and cancer cell lines. To assess and compare the ability of these short CUX1 isoforms in driving mammary tumor development, we used site-specific transgenesis into the Hprt locus to generate transgenic mice expressing p75 or p110 CUX1 under the control of the mouse mammary tumor virus-long terminal repeat. We report that mammary tumors developed after a long latency period, and although various histopathologies were observed, the proportion of adenosquamous carcinomas was significantly higher in p75 CUX1 than in p110 CUX1 transgenic mice. Metastasis to the lung was observed in three p75 CUX1 transgenic mice. Comparisons between tumors and adjacent normal mammary glands revealed that transgenes were overexpressed in most but not all tumors, yet in all cases tested, CUX1 DNA binding was increased, suggesting that both higher expression and changes in post-translational modifications can contribute to stimulate transgene activity. Interestingly, higher expression of erbB2 mRNA was seen in most tumors, not only solid carcinomas but also adenosquamous carcinomas, whereas higher expression of various Wnt genes and activation of the beta-catenin pathway was observed primarily in adenosquamous carcinomas. Activation of erbB2 expression appeared to represent a cooperating event that occurred independently of CUX1. In contrast, chromatin immunoprecipitation, short hairpin RNA-mediated knockdown, and reporter assays established that CUX1 is involved in the transcriptional regulation of several Wnt genes. Together, these results support the notion that oncogenic activity of CUX1 can facilitate the establishment of a Wnt/beta-catenin autocrine loop.
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MESH Headings
- Animals
- Carcinoma, Adenosquamous/genetics
- Carcinoma, Adenosquamous/metabolism
- Carcinoma, Adenosquamous/pathology
- Caseins/biosynthesis
- Caseins/genetics
- Female
- Homeodomain Proteins/biosynthesis
- Homeodomain Proteins/genetics
- Homeodomain Proteins/metabolism
- Humans
- Lung Neoplasms/genetics
- Lung Neoplasms/secondary
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mice
- Mice, Transgenic
- Nuclear Proteins/biosynthesis
- Nuclear Proteins/genetics
- Nuclear Proteins/metabolism
- Protein Isoforms
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Receptor, ErbB-2/biosynthesis
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/metabolism
- Repressor Proteins/biosynthesis
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Transcription Factors
- Transgenes
- Wnt Proteins/metabolism
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Affiliation(s)
- Chantal Cadieux
- Goodman Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada
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14
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Schrauzer GN. Effects of selenium and low levels of lead on mammary tumor development and growth in MMTV-infected female mice. Biol Trace Elem Res 2008; 125:268-75. [PMID: 18726561 DOI: 10.1007/s12011-008-8172-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 05/21/2008] [Indexed: 11/25/2022]
Abstract
Selenium (Se) has been demonstrated in previous studies to inhibit mammary tumorigenesis in C3H mice infected with the murine mammary tumorvirus, MMTV. The antitumorigenic effects of Se in this animal model of breast cancer were subsequently shown to be counteracted by Se-antagonistic elements. Lead (Pb), for example, was found to abolish the anticarcinogenic effects of Se at 5 ppm in the drinking water. The present study was undertaken to explore the effects of Pb at just 0.5 ppm in the water, i.e., at a level comparable to the concentrations of Pb that have been measured in the tap water of older homes in some communities. Groups of 30 female virgin C3H/St mice infected with MMTV maintained on Torula yeast-based diets containing either 0.15 or 0.65 ppm of yeast-based organic Se and received either deionized water or water containing 0.5 ppm Pb as the acetate over their entire postweaning lifespan. In the control group on deionized water and the 0.15 ppm Se feed, the tumor incidence was 78.6%, which is normal for this strain. Increasing the Se content of the feed to 0.65 ppm lowered the tumor incidence to 30%, demonstrating the antitumorigenic effect of Se. In the experimental groups, the Pb-exposed mice on the 0.15 ppm Se feed developed signs of chronic Pb toxicity as evidenced by diminished weight gain that persisted up to the age of 10 months, during which period the animals remained tumor-free. Thereafter, weight gains ensued to near the values of the controls, and the tumors began to develop in rapid succession until the final tumor incidence of 73.7% was reached. In the group of mice on the 0.65 ppm Se feed, the toxic effects of Pb were diminished, as evidenced by the normal weight gains during the first 10 months but with concomitant physiological inactivation of Se, causing 82.6% of the mice to develop tumors, with the first tumor to appear at the age of 5 months, 7 months earlier than in the Pb-unexposed controls. In addition, tumor growth rates in this group were greatly accelerated and the survival of the tumor-bearing animals was significantly shortened. Direct evidence for the interactions of Pb with Se were obtained by determinations of the two elements in the livers, kidneys, and hair of tumor-free and tumor-bearing mice. However, the exposure of the mice to Pb in the water also altered the levels of Zn, Cu, Fe, and Cr in the organs and tissues, more so in tumor-bearing than tumor-free animals. The present study demonstrates the need to consider the interactions of Se with other trace elements in discussions of its mechanism of anticarcinogenic action.
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Affiliation(s)
- G N Schrauzer
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA.
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15
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Abstract
Almost 60 years ago, Foulds carefully described for the first time a particular type of mouse mammary tumor that appeared in the glands of pregnant females and disappeared shortly after delivery. Since then, the attention that researchers paid to the Mouse Mammary Tumor Virus (MMTV)-induced pregnancy-dependent tumors has not vanished through the years. This was because the information obtained from mice carrying MMTV variants that were able to induce pregnancy-dependent tumors was meaningful for studying different aspects of mammary tumor biology. In addition, mice infected with these viral variants provided some of the few chances to use fully hormone-dependent estrogen receptor positive breast cancer models in the mouse. In the analysis of the association between tumor morphology and behavior, the mechanisms underlying progression towards autonomy, the impact of different genes during cancer initiation and development, and the relevance of host genetic background for tumor incidence and hormone-dependence, mouse strains carrying these MMTV variants have been very important tools that could not have been replaced with any other available model. The goal of this article is to provide a succinct chronicle of the experiments and observations made in the MMTV-induced pregnancy-dependent models that most significantly contributed to the mouse mammary tumor biology field. In addition, the possibility to use these MMTV variants as alternative models for analyzing mammary tumor stem cells and pregnancy-associated breast cancer in women is discussed.
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Affiliation(s)
- Edith C Kordon
- Institute of Physiology, Molecular Biology and Neurosciences (IFIBYNE-CONICET), School of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires, Argentina.
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16
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Schrauzer GN. Interactive effects of selenium and cadmium on mammary tumor development and growth in MMTV-infected female mice. A model study on the roles of cadmium and selenium in human breast cancer. Biol Trace Elem Res 2008; 123:27-34. [PMID: 18264682 DOI: 10.1007/s12011-008-8091-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Accepted: 01/11/2008] [Indexed: 10/22/2022]
Abstract
Previous studies demonstrated that the age-corrected breast cancer mortalities in different countries are inversely correlated with the per-capita dietary intakes of selenium and directly with the estimated intakes of cadmium, zinc, and chromium, suggesting that the anticarcinogenic properties of selenium are counteracted by these elements. The tumor-preventative effects of selenium and the converse effects zinc and chromium have already been confirmed experimentally in studies with female inbred C3H mice carrying murine mammary tumor virus (MMTV). Using the same model of human breast cancer, it is now demonstrated that cadmium abolishes the cancer-protecting effects of selenium. In addition, cadmium was also found to interact with zinc, copper, and chromium. At 1.4 ppm in the drinking water, cadmium caused a significant depletion of zinc in vital organs such as the liver, which is held responsible for a delay of the appearance of the mammary tumors by 4 months and their slower growth rates relative to the Cd-unexposed controls. The results of the present study are relevant to human breast cancer prevention as selenium counteracts the effects of cadmium.
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Affiliation(s)
- G N Schrauzer
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA.
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17
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De Las Heras M, Murcia P, Ortín A, Azúa J, Borderías L, Alvarez R, Jiménez-Más JA, Marchetti A, Palmarini M. Jaagsiekte sheep retrovirus is not detected in human lung adenocarcinomas expressing antigens related to the Gag polyprotein of betaretroviruses. Cancer Lett 2007; 258:22-30. [PMID: 17889995 DOI: 10.1016/j.canlet.2007.08.006] [Citation(s) in RCA: 11] [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: 01/10/2007] [Revised: 08/01/2007] [Accepted: 08/06/2007] [Indexed: 10/22/2022]
Abstract
A proportion of human lung adenocarcinomas (hLACs) express an antigen related to the major capsid protein (CA) of Jaagsiekte sheep retrovirus (JSRV), a Betaretrovirus that causes a transmissible lung cancer in sheep. In this study, we have investigated whether JSRV or related betaretroviruses are expressed in hLACs. Results obtained indicate that JSRV is not associated with human lung adenocarcinomas. However, a proportion of hLACs reacted positively in immunohistochemistry with antibodies specific towards different domains of the JSRV Gag suggesting that a bona fide retrovirus antigen could be expressed in these tumours. Further studies will be necessary to ascertain whether the detection of antigens cross-reacting with betaretrovirus Gag antisera in some hLACs is due to expression of a human endogenous retrovirus or, more unlikely, of an uncharacterized exogenous retrovirus.
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Affiliation(s)
- Marcelo De Las Heras
- Departmento de Patología Animal, Facultad de Veterinaria, Universidad de Zaragoza, C/Miguel Servet 177, 50013, Zaragoza, Spain.
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18
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Freitas I, Boncompagni E, Vaccarone R, Fenoglio C, Barni S, Baronzio GF. Iron accumulation in mammary tumor suggests a tug of war between tumor and host for the microelement. Anticancer Res 2007; 27:3059-3065. [PMID: 17970045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Iron is indispensable for the metabolism and proliferation of both normal and malignant cells. Recycling from senescent erythrocytes in the liver and spleen is critical for iron supply to all tissues. In the liver and spleen from MMTV-neu (erbB-2) mice bearing a mammary carcinoma, we noticed the scarcity of hemosiderin pigment and its abundance in the stroma of the tumor. Thus iron (III) was investigated with the Perls' reaction in tissues from normal and MMTV-neu mice. With respect to normal animals, in MMTV-neu mice, staining for iron was almost absent in the liver and scarce in the red pulp of the spleen. By contrast, iron was abundant in stromal and tumor cells in the invasion, angiogenic, necrotic and hemorrhagic regions and also in the interstitial fluid. These observations suggest that the tumor subverts iron recycling to its own advantage, by directly utilizing iron released from erythrocytes and dead tumor cells. Our findings are in keeping with the development of iron chelating drugs as chemotherapic agents.
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Affiliation(s)
- Isabel Freitas
- Department of Animal Biology and CNR-IGM, University of Pavia, 27100 Pavia, Italy.
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19
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Lin DI, Lessie MD, Gladden AB, Bassing CH, Wagner KU, Diehl JA. Disruption of cyclin D1 nuclear export and proteolysis accelerates mammary carcinogenesis. Oncogene 2007; 27:1231-42. [PMID: 17724472 PMCID: PMC3733559 DOI: 10.1038/sj.onc.1210738] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [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: 01/10/2023]
Abstract
Cyclin D1 levels are maintained at steady state by phosphorylation-dependent nuclear export and polyubiquitination by SCF(FBX4-alphaB crystallin). Inhibition of cyclin D1 proteolysis has been implicated as a causative factor leading to its overexpression in breast and esophageal carcinomas; however, the contribution of stable cyclin D1 to the genesis of such carcinomas has not been evaluated. We therefore generated transgenic mice wherein expression of either wild-type or a stable cyclin D1 allele (D1T286A) is regulated by MMTV-LTR. MMTV-D1T286A mice developed mammary adenocarcinomas at an increased rate relative to MMTV-D1 mice. Similar to human cancers that overexpress cyclin D1, D1T286A tumors were estrogen receptor-positive and exhibited estrogen-dependent growth. Collectively, these results suggest that temporal control of cyclin D1 subcellular localization and proteolysis is critical for maintenance of homeostasis within the mammary epithelium.
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MESH Headings
- Active Transport, Cell Nucleus/genetics
- Adenocarcinoma/etiology
- Adenocarcinoma/metabolism
- Adenocarcinoma/virology
- Animals
- Cell Line, Tumor
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cells, Cultured
- Cyclin D1/genetics
- Cyclin D1/metabolism
- Cyclin D1/physiology
- Female
- Homeostasis/genetics
- Humans
- Hydrolysis
- Mammary Neoplasms, Animal/etiology
- Mammary Neoplasms, Animal/metabolism
- Mammary Neoplasms, Animal/virology
- Mammary Neoplasms, Experimental/etiology
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/pathogenicity
- Mice
- Mice, Transgenic
- Phosphorylation
- Subcellular Fractions/metabolism
- Ubiquitination/genetics
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Affiliation(s)
- Douglas I. Lin
- The Leonard and Madlyn Abramson Family Cancer Research Institute and Cancer Center
- Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Matthew D. Lessie
- The Leonard and Madlyn Abramson Family Cancer Research Institute and Cancer Center
- Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Andrew B. Gladden
- The Leonard and Madlyn Abramson Family Cancer Research Institute and Cancer Center
- Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Craig H. Bassing
- Department of Pathology and Laboratory Medicine, Children’s Hospital of Philadelphia, Abramson Family Cancer Research Institute, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Kay-Uwe Wagner
- Eppley Institute for Research in Cancer and Allied Diseases and the Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA
| | - J. Alan Diehl
- The Leonard and Madlyn Abramson Family Cancer Research Institute and Cancer Center
- Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- To whom correspondence should be directed:
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20
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Corsino P, Davis B, Law M, Chytil A, Forrester E, Nørgaard P, Teoh N, Law B. Tumors Initiated by Constitutive Cdk2 Activation Exhibit Transforming Growth Factor β Resistance and Acquire Paracrine Mitogenic Stimulation during Progression. Cancer Res 2007; 67:3135-44. [PMID: 17409420 DOI: 10.1158/0008-5472.can-06-3815] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [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: 11/16/2022]
Abstract
Cyclin D1/cyclin-dependent kinase 2 (Cdk2) complexes are present at high frequency in human breast cancer cell lines, but the significance of this observation is unknown. This report shows that expression of a cyclin D1-Cdk2 fusion protein under the control of the mouse mammary tumor virus (MMTV) promoter results in mammary gland hyperplasia and fibrosis, and mammary tumors. Cell lines isolated from MMTV-cyclin D1-Cdk2 (MMTV-D1K2) tumors exhibit Rb and p130 hyperphosphorylation and up-regulation of the protein products of E2F-dependent genes. These results suggest that cyclin D1/Cdk2 complexes may mediate some of the transforming effects that result from cyclin D1 overexpression in human breast cancers. MMTV-D1K2 cancer cells express the hepatocyte growth factor (HGF) receptor, c-Met. MMTV-D1K2 cancer cells also secrete transforming growth factor beta (TGFbeta), but are relatively resistant to TGFbeta antiproliferative effects. Fibroblasts derived from MMTV-D1K2 tumors secrete factors that stimulate the proliferation of MMTV-D1K2 cancer cells, stimulate c-Met tyrosine phosphorylation, and stimulate the phosphorylation of the downstream signaling intermediates p70(s6k) and Akt on activating sites. Together, these results suggest that deregulation of the Cdk/Rb/E2F axis reprograms mammary epithelial cells to initiate a paracrine loop with tumor-associated fibroblasts involving TGFbeta and HGF, resulting in desmoplasia. The MMTV-D1K2 mice should provide a useful model system for the development of therapeutic approaches to block the stromal desmoplastic reaction that likely plays an important role in the progression of multiple types of human tumors.
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Affiliation(s)
- Patrick Corsino
- Department of Pharmacology and Therapeutics and the Shands Cancer Center, University of Florida, Gainesville, Florida, USA
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21
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Abstract
Mouse mammary tumor virus (MMTV) has developed a strategy of exploitation of the immune response. It infects dendritic cells and B cells and requires this infection to establish an efficient chronic infection. This allows transmission of infection to the mammary gland, production in milk and infection of the next generation via lactation. The elaborate strategy developed by MMTV utilizes several key elements of the normal immune response. Starting with the infection and activation of dendritic cells and B cells leading to the expression of a viral superantigen followed by professional superantigen-mediated priming of naive polyclonal T cells by dendritic cells and induction of superantigen-mediated T cell B cell collaboration results in long-lasting germinal center formation and production of long-lived B cells that can later carry the virus to the mammary gland epithelium. Later in life it can induce transformation of mammary gland epithelium by integrating close to proto-oncogenes leading to their overexpression. Genes encoding proteins of the Wnt-pathway are preferential targets. This review will put these effects in the context of a normal immune response and summarize important facts on MMTV biology.
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Affiliation(s)
- Hans Acha-Orbea
- Department of Biochemistry, University of Lausanne, Ch. des Boveresses 155, CH-1066 Epalinges, Switzerland.
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Gattelli A, Zimberlin MN, Meiss RP, Castilla LH, Kordon EC. Selection of early-occurring mutations dictates hormone-independent progression in mouse mammary tumor lines. J Virol 2006; 80:11409-15. [PMID: 16971449 PMCID: PMC1642155 DOI: 10.1128/jvi.00234-06] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [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: 01/28/2023] Open
Abstract
Mice harboring three mouse mammary tumor virus (MMTV) variants develop pregnancy-dependent (PD) tumors that progress to pregnancy-independent (PI) behavior through successive passages. Herein, we identified 10 predominant insertions in PI transplants from 8 independent tumor lines. These mutations were also detected in small cell populations in the early PD passages. In addition, we identified a new viral insertion upstream of the gene Rspo3, which is overexpressed in three of the eight independent tumor lines and codes for a protein very similar to the recently described protein encoded by Int7. This study suggests that during progression towards hormone independence, clonal expansion of cells with specific mutations might be more relevant than the occurrence of new MMTV insertions.
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Affiliation(s)
- Albana Gattelli
- IFIBYNE-CONICET, Facultad de Ciencias Exactas y Naturales, UBA Ciudad Universitaria, Pabellón 2, 2do piso, (1428) Buenos Aires, Argentina
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23
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Woditschka S, Haag JD, Waller JL, Monson DM, Hitt AA, Brose HL, Hu R, Zheng Y, Watson PA, Kim K, Lindstrom MJ, Mau B, Steele VE, Lubet RA, Gould MN. Neu-induced retroviral rat mammary carcinogenesis: a novel chemoprevention model for both hormonally responsive and nonresponsive mammary carcinomas. Cancer Res 2006; 66:6884-91. [PMID: 16818667 DOI: 10.1158/0008-5472.can-05-1823] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [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: 11/16/2022]
Abstract
Clinically relevant animal models of mammary carcinogenesis are crucial for the development and evaluation of new breast cancer chemopreventive agents. The neu-induced retroviral rat mammary carcinogenesis model is based on the direct in situ transfer of the activated neu oncogene into the mammary epithelium using a replication-defective retroviral vector. The resulting mammary carcinomas in intact Wistar-Furth rats exhibit a mixed hormonal response in the same proportion as has been observed in women. In intact rats, approximately 50% of mammary carcinomas can be prevented by tamoxifen treatment. In ovariectomized animals, the mammary carcinomas are hormonally nonresponsive and cannot be prevented by tamoxifen. We evaluated the efficacy of retinoic X receptor-selective retinoids (rexinoids) in this novel model of mammary carcinogenesis. The rexinoids LG100268 and bexarotene (LG1069, Targretin) were highly efficacious in the prevention of neu-induced mammary carcinomas. Dietary LG100268 at 100 mg/kg diet decreased tumor multiplicity by 32% (P = 0.0114) in intact rats and 50% (P < 0.0001) in ovariectomized rats. Bexarotene treatment at a dose of 250 mg/kg diet was associated with reductions in tumor multiplicity of 84% (P < 0.0001) and 86% (P < 0.0001) in intact and ovariectomized animals, respectively. In addition to tumor multiplicity, proliferation and apoptosis were modulated by bexarotene treatment independently of estrogen signaling. The neu-induced retroviral rat mammary carcinogenesis model represents a valuable addition to existing rodent chemoprevention models. The model is useful for assessing the efficacy of chemopreventive agents, specifically those compounds that target hormonally nonresponsive tumors.
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MESH Headings
- Animals
- Anticarcinogenic Agents/pharmacology
- Bexarotene
- Body Weight/drug effects
- Disease Models, Animal
- Female
- Genes, erbB-2
- Genetic Vectors/genetics
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/prevention & control
- Mammary Neoplasms, Experimental/virology
- Neoplasms, Hormone-Dependent/genetics
- Neoplasms, Hormone-Dependent/pathology
- Neoplasms, Hormone-Dependent/prevention & control
- Neoplasms, Hormone-Dependent/virology
- Nicotinic Acids/pharmacology
- Rats
- Rats, Inbred WF
- Retroviridae/genetics
- Tamoxifen/pharmacology
- Tetrahydronaphthalenes/pharmacology
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Affiliation(s)
- Stephan Woditschka
- McArdle Laboratory for Cancer Research, University of Wisconsin, 1400 University Avenue, Madison, WI 53706, USA
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24
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Joung KE, Min KN, An JY, Kim DK, Kong G, Sheen YY. Potent in vivo anti-breast cancer activity of IN-2001, a novel inhibitor of histone deacetylase, in MMTV/c-Neu mice. Cancer Res 2006; 66:5394-402. [PMID: 16707467 DOI: 10.1158/0008-5472.can-05-3835] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A novel synthetic inhibitor of histone deacetylase (HDAC), 3-(4-dimethylaminophenyl)-N-hydroxy-2-propenamide (IN-2001), was examined for its antitumor activity and for the underlying molecular mechanisms of any such activity. IN-2001 effectively inhibited cellular HDAC activity (IC(50), 5.42 nmol/L) in MCF-7 human breast cancer cells. Based on the Western blot analysis, this HDAC inhibitory effect of IN-2001 was confirmed by an increase in histone H4 acetylation from the IN-2001-treated breast cancer cells. IN-2001 suppressed mammary tumor growth in MMTV/c-Neu transgenic mice and also showed higher apoptotic index and lower lymphatic invasion compared with controls. In human breast cancer cells (MCF-7, T47D, MDA-MB-231, and MDA-MB-468), IN-2001 induced cell cycle arrest at G(2)-M phase through up-regulation of p21(WAF1) and p27(KIP1) and eventually caused apoptosis. IN-2001-induced apoptosis was caspase dependent and seems mediated through an increase in Bax/Bcl-2 ratio. Taken together, our data indicate that this novel HDAC inhibitor is a promising therapeutic agent against human breast cancer.
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Affiliation(s)
- Ki E Joung
- College of Pharmacy, Ewha Womans University, Seoul, Korea
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25
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Cabodi S, Tinnirello A, Di Stefano P, Bisarò B, Ambrosino E, Castellano I, Sapino A, Arisio R, Cavallo F, Forni G, Glukhova M, Silengo L, Altruda F, Turco E, Tarone G, Defilippi P. p130Cas as a new regulator of mammary epithelial cell proliferation, survival, and HER2-neu oncogene-dependent breast tumorigenesis. Cancer Res 2006; 66:4672-80. [PMID: 16651418 DOI: 10.1158/0008-5472.can-05-2909] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To investigate the mechanisms through which p130Cas adaptor protein is linked to tumorigenesis, we generated mouse mammary tumor virus (MMTV)-p130Cas mice overexpressing p130Cas in the mammary gland. MMTVp130Cas transgenic mice are characterized by extensive mammary epithelial hyperplasia during development and pregnancy and by delayed involution at the end of lactation. These phenotypes are associated with activation of Src kinase, extracellular signal-regulated kinase 1/2, mitogen-activated protein kinase, and Akt pathways, leading to an increased rate of proliferation and a decreased apoptosis. A double-transgenic line derived from crossing MMTV-p130Cas with MMTV-HER2-Neu mice expressing the activated form of the HER2-Neu oncogene develops multifocal mammary tumors with a significantly shorter latency than the HER2-Neu parental strain alone. Mammary epithelial cells isolated from tumors of double-transgenic mice display increased tyrosine phosphorylation, c-Src, and Akt activation compared with cells derived from HER2-Neu tumors. In addition, p130Cas down-regulation by RNA interference increases apoptosis in HER2-Neu-expressing cells, indicating that p130Cas regulates cell survival. Consistently with the double-transgenic mice model, p130Cas is overexpressed in a significant subset of human breast cancers and high levels of p130Cas in association with HER2 expression correlate with elevated proliferation. These findings provide evidences for a role of p130Cas as a positive regulator of both proliferation and survival in normal and transformed mammary epithelial cells. Its overexpression contributes to HER2-Neu-induced breast tumorigenesis, thus identifying this protein as a putative target for clinical therapy.
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MESH Headings
- Animals
- Apoptosis/genetics
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Cell Cycle
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/pathology
- Crk-Associated Substrate Protein/biosynthesis
- Crk-Associated Substrate Protein/genetics
- Crk-Associated Substrate Protein/physiology
- Female
- Genes, erbB-2
- Humans
- Mammary Glands, Animal/metabolism
- Mammary Glands, Animal/pathology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse
- Mice
- Mice, Transgenic
- RNA Interference
- Receptor, ErbB-2/biosynthesis
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/physiology
- Signal Transduction
- Up-Regulation
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Affiliation(s)
- Sara Cabodi
- Department of Genetics, Biology and Biochemistry, University of Torino, Italy
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26
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Swanson I, Jude BA, Zhang AR, Pucker A, Smith ZE, Golovkina TV. Sequences within the gag gene of mouse mammary tumor virus needed for mammary gland cell transformation. J Virol 2006; 80:3215-24. [PMID: 16537589 PMCID: PMC1440402 DOI: 10.1128/jvi.80.7.3215-3224.2006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 11/20/2022] Open
Abstract
Previously, we identified a group of replication-competent exogenous mouse mammary tumor viruses that failed to induce mammary tumors in susceptible mice. Sequence comparison of tumorigenic and tumor-attenuated virus variants has linked the ability of virus to cause high-frequency mammary tumors to the gag gene. To determine the specific sequences within the gag gene that contribute to tumor induction, we constructed five distinct chimeric viruses that have various amino acid coding sequences of gag derived from a tumor-attenuated virus replaced by those of highly tumorigenic virus and tested these viruses for tumorigenic capacities in virus-susceptible C3H/HeN mice. Comparing the tumorigenic potentials of these viruses has allowed us to map the region responsible for tumorigenesis to a 253-amino-acid region within the CA and NC regions of the Gag protein. Unlike C3H/HeN mice, BALB/cJ mice develop tumors when infected with all viral variants, irrespective of the gag gene sequences. Using genetic crosses between BALB/cJ and C3H/HeN mice, we were able to determine that the mechanism that confers susceptibility to Gag-independent mammary tumors in BALB/cJ mice is inherited as a dominant trait and is controlled by a single gene, called mammary tumor susceptibility (mts), that maps to chromosome 14.
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MESH Headings
- Amino Acid Sequence
- Animals
- Blotting, Western
- Cell Transformation, Neoplastic
- Chromosome Mapping
- Chromosomes
- Cloning, Molecular
- Conserved Sequence
- Crosses, Genetic
- Female
- Gene Expression Regulation, Neoplastic
- Gene Expression Regulation, Viral
- Genes, gag
- Genetic Engineering
- Haplotypes
- Mammary Neoplasms, Experimental/etiology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mammary Tumor Virus, Mouse/pathogenicity
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Mice, Transgenic
- Models, Genetic
- Molecular Sequence Data
- Mutagenesis
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Lacher MD, Tiirikainen MI, Saunier EF, Christian C, Anders M, Oft M, Balmain A, Akhurst RJ, Korn WM. Transforming growth factor-beta receptor inhibition enhances adenoviral infectability of carcinoma cells via up-regulation of Coxsackie and Adenovirus Receptor in conjunction with reversal of epithelial-mesenchymal transition. Cancer Res 2006; 66:1648-57. [PMID: 16452224 DOI: 10.1158/0008-5472.can-05-2328] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Expression of the Coxsackie and Adenovirus Receptor (CAR) is frequently reduced in carcinomas, resulting in decreased susceptibility of such tumors to infection with therapeutic adenoviruses. Because CAR participates physiologically in the formation of tight-junction protein complexes, we examined whether molecular mechanisms known to down-regulate cell-cell adhesions cause loss of CAR expression. Transforming growth factor-beta (TGF-beta)-mediated epithelial-mesenchymal transition (EMT) is a phenomenon associated with tumor progression that is characterized by loss of epithelial-type cell-cell adhesion molecules (including E-cadherin and the tight junction protein ZO-1), gain of mesenchymal biochemical markers, such as fibronectin, and acquisition of a spindle cell phenotype. CAR expression is reduced in tumor cells that have undergone EMT in response to TGF-beta. This down-regulation results from repression of CAR gene transcription, whereas altered RNA stability and increased proteasomal protein degradation play no role. Loss of CAR expression in response to TGF-beta is accompanied by reduced susceptibility to adenovirus infection. Indeed, treatment of carcinoma cells with LY2109761, a specific pharmacologic inhibitor of TGF-beta receptor types I and II kinases, resulted in increased CAR RNA and protein levels as well as improved infectability with adenovirus. This was observed in cells induced to undergo EMT by addition of exogenous TGF-beta and in those that were transformed by endogenous autocrine/paracrine TGF-beta. These findings show down-regulation of CAR in the context of EMT and suggest that combination of therapeutic adenoviruses and TGF-beta receptor inhibitors could be an efficient anticancer strategy.
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Affiliation(s)
- Markus D Lacher
- Division of Gastroenterology and Hematology/Oncology, University of California-San Francisco Comprehensive Cancer Center, San Francisco, CA 94143, USA
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28
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Abstract
Mouse mammary tumor virus (MMTV), a well-characterized retrovirus that causes mammary tumors in susceptible mice, is commonly used to investigate virus-host interactions. We have shown that YBR/Ei mice demonstrate a novel, dominant mechanism of resistance to MMTV infection and MMTV-induced mammary tumors. MMTV can both establish infection in YBR/Ei mice and be transmitted by YBR/Ei mice as an infectious virus. However, virus production is severely attenuated, resulting in gradual clearance of infection in successive generations. Our transfer experiments showed that T cells generated in MMTV-infected resistant mice were required to restrict MMTV replication in susceptible mice. These results emphasize the importance of inducing T-cell responses for effective protection against retroviral infections.
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29
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Popken-Harris P, Kirchhof N, Harrison B, Harris LF. Gene expression array analyses predict increased proto-oncogene expression in MMTV induced mammary tumors. Virus Res 2006; 119:177-86. [PMID: 16469401 DOI: 10.1016/j.virusres.2006.01.006] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/01/2006] [Indexed: 11/28/2022]
Abstract
Exogenous infection by milk-borne mouse mammary tumor viruses (MMTV) typically induce mouse mammary tumors in genetically susceptible mice at a rate of 90-95% by 1 year of age. In contrast to other transforming retroviruses, MMTV acts as an insertional mutagen and under the influence of steroid hormones induces oncogenic transformation after insertion into the host genome. As these events correspond with increases in adjacent proto-oncogene transcription, we used expression array profiling to determine which commonly associated MMTV insertion site proto-oncogenes were transcriptionally active in MMTV induced mouse mammary tumors. To verify our gene expression array results we developed real-time quantitative RT-PCR assays for the common MMTV insertion site genes found in RIII/Sa mice (int-1/wnt-1, int-2/fgf-3, int-3/Notch 4, and fgf8/AIGF) as well as two genes that were consistently up regulated (CCND1, and MAT-8) and two genes that were consistently down regulated (FN1 and MAT-8) in the MMTV induced tumors as compared to normal mammary gland. Finally, each tumor was also examined histopathologically. Our expression array findings support a model whereby just one or a few common MMTV insertions into the host genome sets up a dominant cascade of events that leave a characteristic molecular signature.
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Affiliation(s)
- Pamela Popken-Harris
- David F. Hickok Memorial Cancer Research Laboratory, Abbott Northwestern Hospital, Mpls., MN 54407, USA.
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30
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Abstract
Intratumoral infusion is the most commonly used method for viral gene delivery in clinical trials for cancer treatment. However, a potential problem in this approach is that viral vectors may disseminate from tumor to normal tissues during and after the infusion. To reduce the dissemination, we developed a novel method based on a biocompatible polymer, poloxamer 407, which could significantly increase the viscosity of virus suspension when the temperature was changed from 4 degrees C to 37 degrees C. With this method, we could significantly increase transgene expression in solid tumors and reduce virus dissemination by 2 orders of magnitude after intratumoral infusion of adenoviral vectors. The mechanism of reduction was likely to be that the viscous poloxamer solution blocked convection of viral vectors in the interstitial space and the lumen of microvessels in the vicinity of the infusion site. This method has a potential to be used in the clinic for enhancing efficacy and reducing toxicity in viral gene therapy.
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Affiliation(s)
- Yong Wang
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA
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31
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Abstract
Type B leukemogenic virus is a variant of mouse mammary tumor virus (MMTV) that causes thymic lymphomas rather than mammary tumors in mice. We demonstrate that conversion of a mammotropic MMTV to a T-cell-tropic virus requires two alterations in the long terminal repeat: (i) acquisition of a T-cell-specific enhancer and (ii) loss of transcriptional repression through deletion of negative regulatory elements (NREs) or by suppression of NRE activity after appropriate positioning of the enhancer.
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Affiliation(s)
- Sanchita Bhadra
- Section of Molecular Genetics and Microbiology, The University of Texas at Austin, Austin, TX 78712-0162, USA
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32
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Abstract
MUC1 is an integral membrane mucin glycoprotein that is normally expressed on the apical surface of most simple, secretory epithelia and hematopoietic cells. Overexpression of aberrantly glycosylated MUC1 is a hallmark of many carcinomas including 90% of breast carcinomas. MUC1 has been shown to bind to c-Src tyrosine kinase in vitro, whereby c-Src phosphorylates the MUC1 cytoplasmic domain at a YEKV motif. c-Src is an extensively studied nonreceptor tyrosine kinase implicated in mammary tumorigenesis. Previously, mouse mammary tumor virus-driven polyoma middle T-antigen (MMTV-PyV MT) transgenic mice crossed onto a Muc1 null background exhibited a significant delay in tumor progression. c-Src has been shown to interact with PyV MT, and to play an integral and indispensable role in MMTV-PyV MT-induced mammary tumorigenesis. Here, we determine the effect of Muc1 expression on c-Src activation and signaling. Examination of MMTV-PyV MT glands on a wild-type or Muc1 null background demonstrates that Muc1 expression promotes c-Src signaling by influencing its association with known substrates such as the p85 subunit of phosphatidylinositol 3-kinase and beta-catenin. These findings may provide a mechanism for the delay in tumor progression that is observed in the absence of Muc1.
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Affiliation(s)
- Azzah Al Masri
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Scottsdale, AZ 85259, USA
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Bar-Sinai A, Bassa N, Fischette M, Gottesman MM, Love DC, Hanover JA, Hochman J. Mouse Mammary Tumor Virus Env–Derived Peptide Associates with Nucleolar Targets in Lymphoma, Mammary Carcinoma, and Human Breast Cancer. Cancer Res 2005; 65:7223-30. [PMID: 16103073 DOI: 10.1158/0008-5472.can-04-3879] [Citation(s) in RCA: 18] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have previously shown that the leader peptide (p14) of the Env-precursor of mouse mammary tumor virus is translocated into the nucleoli of murine T cell lymphomas that harbor this virus. Using a polyclonal antibody against recombinant p14, we show here that p14 is also localized to the nucleoli of murine mammary carcinomas and some human breast cancer samples. Affinity purification studies define a number of proteins, mostly nucleolar, that bind p14. Taken together, these findings point towards a more general involvement of p14 in lymphomagenesis and mammary carcinogenesis.
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Affiliation(s)
- Allan Bar-Sinai
- Department of Cell and Animal Biology, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
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Abstract
In this study, we identified murine breast cancer cell lines that support DNA replication of E1-deleted adenovirus vectors and which can be killed by an oncolytic adenovirus expressing adenovirus E1A and tumor necrosis factor (TNF)-related apoptosis inducing ligand (TRAIL) in a replication-dependent manner (Ad.IR-E1A/TRAIL). We showed that systemic or intratumoral (i.t.) injection of adenovirus vectors into mice increases plasma levels of proinflammatory cytokines and chemokines, including TNF-alpha, INF-gamma, and MCP-1, which are potent inducers of dendritic cell maturation. Furthermore, we showed that in vivo expression of Flt3L from an adenovirus vector increases the number of CD11b+ and CD11c+ cells (populations that include dendritic cells) in the blood circulation. Based on these findings, we tested whether Ad.IR-E1A/TRAIL induced killing of tumor cells in combination with dendritic cell mobilization by Ad.Flt3L or, for comparison, Ad.GM-CSF would have an additive antitumor effect. As a model, we used immunocompetent C3H mice with syngeneic s.c. tumors derived from C3L5 cells. We found that vaccination of mice with C3L5 cells that underwent viral oncolysis in combination with Flt3L or granulocyte-macrophage colony-stimulating factor (GM-CSF) expression induces a systemic antitumor immune response. I.t. injection of the oncolytic and Flt3L expressing vectors into established tumors delayed tumor growth but did not cause efficient tumor elimination. This study shows the effectiveness of a combined oncolytic/immunostimulatory tumor therapy approach.
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Affiliation(s)
- Kathrin Maria Bernt
- Division of Medical Genetics and Department of Pathology, University of Washington, Seattle, Washington, USA
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35
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Abstract
Oncolytic herpes simplex virus vectors are a promising strategy for cancer therapy, as direct cytotoxic agents, inducers of antitumor immune responses, and as expressers of anticancer genes. Progress is dependent upon representative preclinical models to evaluate therapy. In this study, two families of oncolytic herpes simplex virus vectors (G207 and NV1020 series) that have been in clinical trials were examined for the treatment of breast cancer, using the C3(1)/T-Ag transgenic mouse model. Female mice spontaneously develop mammary carcinomas, and the C3(1)/T-Ag-derived tumor cell line M6c forms implantable tumors. Both in vitro and in vivo, G47Delta, derived from G207 by deletion of ICP47 and the US11 promoter, was more efficacious than G207. Whereas NV1023, derived from NV1020 by deletion of ICP47 and insertion of LacZ, was as cytotoxic to M6c cells in vitro as G47Delta, it did not inhibit the growth of s.c. M6c tumors but did extend the survival of intracerebral tumor bearing mice. In contrast, NV1042, NV1023 expressing interleukin 12, inhibited s.c. M6c tumor growth to a similar extent as G47Delta, but was less effective than NV1023 in intracerebral tumors. In the spontaneously arising mammary tumor model, when only the first arising tumor per mouse was treated, G47Delta inhibited the growth of a subset of tumors, and when all tumors were treated, G47Delta significantly delayed tumor progression. When the first mammary tumor was treated and the remaining mammary glands removed, NV1042 was more efficacious than G47Delta at inhibiting the growth and progression of injected tumors.
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Affiliation(s)
- Renbin Liu
- Molecular Neurosurgery Laboratory, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, USA
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36
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Liu RB, Rabkin SD. Oncolytic herpes simplex virus vectors for the treatment of human breast cancer. Chin Med J (Engl) 2005; 118:307-12. [PMID: 15740669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
BACKGROUND Oncolytic herpes simplex virus (HSV) vectors can be used for cancer therapy as direct cytotoxic agents, inducers of anti-tumor immune responses, and as expressers of anti-cancer genes. In this study, the efficacy of HSV vectors, G47Delta and NV1023 were examined for the treatment of the human breast cancer. METHODS Human breast cancer MDA-MB-435 cells were cultured or implanted subcutaneously in BALB/c nude mice. The cells or tumors were inoculated with G47Delta or NV1023, and cell killing or inhibition of tumor growth determined. Both viruses contained the LacZ gene and expression in infected cells was detected with X-gal histochemistry. RESULTS G47Delta and NV1023 were highly cytotoxic to MDA-MB-435 cells in vitro at very low multiplicities of infection. X-gal staining of infected tumor cells in vitro and in vivo illustrated the replication and spread of both viruses. G47Delta and NV1023 inoculation inhibited tumor growth and prolonged mouse survival. Both vectors behaved similarly. CONCLUSIONS Oncolytic HSV vectors, G47Delta and NV1023, were extremely effective at killing human breast cancer cells in vitro and in tumor xenografts in vivo. This novel form of cancer therapy warrants further investigation and consideration of clinical application.
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Affiliation(s)
- Ren-bin Liu
- Department of Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China.
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37
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Abstract
Mouse mammary tumor virus (MMTV), a member of the betaretroviridae, is the most common cause of breast cancer (BC) in mice. MMTV is transmitted in mice both in the germline as endogenous proviruses and exogenously as infectious virions. Here, we review a variety of evidence accumulated for six decades that has suggested that a human homologue of MMTV may exist. The findings include recent studies from several independent laboratories that have detected sequences very closely related to MMTV in DNA isolated from human BC tumors. Other laboratories, however, have failed to detect the MMTV-related sequences in human DNA samples, and conclusive evidence for a human mammary tumor virus has been elusive. We also reviewed additional studies, suggesting that betaretroviruses are present in a much wider range of species than previously known, including rodents, felines, and primates. The observation that a subset of cats may be infected with a close homologue of MMTV may be of epidemiological significance for human BC. Cats may become infected by MMTV from mice, and in turn may transmit the virus to humans, possibly after selection for variants with an expanded host range.
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Affiliation(s)
- Sara Szabo
- Department of Pathology, Children's Hospital, New Orleans, Louisiana 70118, USA.
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38
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Abstract
I have used the paradigm of mammary cancer induction by the mouse mammary tumor virus (MMTV) to illustrate the body of evidence that supports the hypothesis that mammary epithelial stem/progenitor cells represent targets for oncogenic transformation. Further, it is argued that this is not a special case applicable only to MMTV-induced mammary cancer, because MMTV acts as an environmental mutagen producing random interruptions in the somatic DNA of infected cells by insertion of proviral DNA copies. In addition to disrupting the host genome, the proviral DNA also influences gene expression through its associated enhancer sequences over significant inter-genome distances. Genes commonly affected by MMTV insertion in multiple individual tumors include the Wnt genes, the fibroblast growth factor (FGF) gene family, and the Notch gene family. All of these gene families are known to play essential roles in stem cell maintenance and behavior in a variety of organs. The MMTV-induced mutations accumulate in cells that are long-lived and possess the properties of stem cells, namely, self-renewal and the capacity to produce divergent epithelial progeny through asymmetric division. The evidence shows that epithelial cells with these properties are present in normal mammary glands, may be infected with MMTV, and become transformed to produce epithelial hyperplasia through MMTV-induced mutagenesis and progress to frank mammary malignancy. Retroviral marking via MMTV proviral insertion demonstrates that this process progresses from a single mammary epithelial cell that possesses all the features ascribed to tissue-specific stem cells.
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MESH Headings
- Animals
- Cell Transformation, Viral/genetics
- Epithelial Cells/metabolism
- Epithelial Cells/ultrastructure
- Epithelial Cells/virology
- Female
- Gene Expression Regulation, Neoplastic/genetics
- Mammary Neoplasms, Animal/genetics
- Mammary Neoplasms, Animal/metabolism
- Mammary Neoplasms, Animal/ultrastructure
- Mammary Neoplasms, Animal/virology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/ultrastructure
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mammary Tumor Virus, Mouse/metabolism
- Mice
- Mutagenesis, Insertional
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/virology
- Virus Integration/genetics
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Affiliation(s)
- Gibert H Smith
- Mammary Biology and Tumorigenesis Laboratory, Center for Cancer Research, National Cancer Institute, Bethesda, MD 10892, USA.
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39
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Nakamori M, Fu X, Rousseau R, Chen SY, Zhang X. Destruction of nonimmunogenic mammary tumor cells by a fusogenic oncolytic herpes simplex virus induces potent antitumor immunity. Mol Ther 2004; 9:658-65. [PMID: 15120326 DOI: 10.1016/j.ymthe.2004.02.019] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [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: 01/29/2004] [Accepted: 02/27/2004] [Indexed: 10/26/2022] Open
Abstract
In principle, destruction of tumor cells in vivo by oncolytic agents would release the entire repertoire of tumor antigens in their natural forms, leading to effective antitumor immunity. This goal has been elusive despite extensive testing of numerous strategies. We developed a doubly fusogenic oncolytic herpes simplex virus (Synco-2D) that kills tumor cells by a unique dual mechanism combining direct cytolysis with syncytial formation induced by cell membrane fusion. A single intratumor injection of Synco-2D induced strong antitumor immunity against an otherwise nonimmunogenic murine mammary tumor growing in immune-competent mice. CD8+ T cells were the primary mediators of immunity, contributing to the destruction of both primary and metastatic tumors. We conclude that the fusogenic capacity of Synco-2D enables it to elicit antitumor immunity exceeding that induced by more conventional oncolytic viruses.
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Affiliation(s)
- Mikihito Nakamori
- Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, TX 77030, USA
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40
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Qiu TH, Chandramouli GVR, Hunter KW, Alkharouf NW, Green JE, Liu ET. Global expression profiling identifies signatures of tumor virulence in MMTV-PyMT-transgenic mice: correlation to human disease. Cancer Res 2004; 64:5973-81. [PMID: 15342376 DOI: 10.1158/0008-5472.can-04-0242] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
FVB/N-Tg (MMTV-PyMT)(634Mul)-transgenic mice develop multifocal mammary tumors with a high incidence of pulmonary metastasis. We have demonstrated previously that mammary tumors derived from transgene-positive F1 progeny in particular inbred strains display altered latency, tumor growth rates, and metastatic rates when compared with the FVB/NJ homozygous parent. To identify genes with expression that might be critical in modifying the biological behavior of MMTV-PyMT tumors, we performed a detailed comparative analysis of expression profiles from mammary tumors arising in the parental FVB/NJ background and F1 progeny from crosses with I/LnJ, LP/J, MOLF/Ei, and NZB/B1NJ mice. Compared with normal mammary glands, gene expression profiles of tumors from all five strains exhibited up-regulation of genes involved in cell growth (e.g., Cks1 and CDC25C) and down-regulation of cell adhesion molecules, with many genes associated previously with human breast cancer such as STAT2, CD24 antigen, gelsolin, and lipocalin2. To identify genes with significant variation in expression between the five different genotypes, significance analysis of microarrays (SAM) and one-way ANOVA were used. Three definable groupings of tumors were identified: (a) tumors derived in the LP/J F1 and MOLF/Ei F1 strains in which tumor growth and dissemination are suppressed and latency prolonged; (b) the most aggressive tumors from the FVB/NJ parental strain and I/LnJ F1 genomic backgrounds; and (c) an intermediate virulence phenotype with tumors from NZB/B1NJ-F1 crosses. These array based assessments correlated well with a composite phenotype ranking using a "virulence" index. The gene expression signature that is associated with a high metastatic rate in the mouse contains the same 17 genes described recently as the signature gene set predictive of metastasis in human tumors (1) with 16 of the 17 genes exhibiting the same directional change in expression associated with human metastases. These results demonstrate that the genetic analysis of mouse models of tumorigenesis may be highly relevant to human cancer and that the metastatic phenotype of a tumor may be affected by the germline genetic configuration of the host.
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MESH Headings
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/pathology
- Disease Models, Animal
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic/genetics
- Humans
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/genetics
- Mice
- Mice, Transgenic
- Oligonucleotide Array Sequence Analysis
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Affiliation(s)
- Ting Hu Qiu
- Laboratory of Cell Regulation and Carcinogenesis, Cancer Research Center, National Cancer Institute, Bethesda, Maryland 20892, USA
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41
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Gattelli A, Cirio MC, Quaglino A, Schere-Levy C, Martinez N, Binaghi M, Meiss RP, Castilla LH, Kordon EC. Progression of pregnancy-dependent mouse mammary tumors after long dormancy periods. Involvement of Wnt pathway activation. Cancer Res 2004; 64:5193-9. [PMID: 15289324 DOI: 10.1158/0008-5472.can-03-3992] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 11/16/2022]
Abstract
Mouse mammary tumor virus (LA) induces pregnancy-dependent mammary tumors that progress toward autonomy. Here we show that in virgin females, pregnancy-dependent tumor transplants are able to remain dormant for up to 300 days. During that period, these tumors synthesize DNA, express high levels of estrogen and progesterone receptors (ER+PR+) and are able to resume growth after hormone stimulation. Surprisingly, in a subsequent transplant generation, all these tumors are fully able to grow in virgin females, they express low levels of ER and PR (ER-PR-) and have a monoclonal origin; i.e., show all of the features we have described previously in pregnancy-independent tumors. Histologically, mouse mammary tumor virus (LA)-induced tumors are morphologically similar to genetically engineered mouse (GEM) mammary tumors that overexpress genes belonging to the Wnt pathway. Interestingly, in the virus-induced neoplasias, pregnancy-independent passages arising after a dormant phase usually display a lower level of glandular differentiation together with epithelial cell trans-differentiation, a specific feature associated to Wnt pathway activation. In addition, dormancy can lead to the specific selection of Int2/Fgf3 mutated and overexpressing cells. Therefore, our results indicate that during hormone-dependent tumor dormancy, relevant changes in cell population occur, allowing rapid progression after changes in the animal internal milieu.
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Affiliation(s)
- Albana Gattelli
- ILEX-CONICET, División Medicina Experimental, Instituto de Investigaciones Hematológicas e Instituto de Estudios Oncológicos, Academia Nacional de Medicina, J.A. Pacheco de Melo 3081, (1425) Buenos Aires, Argentina
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Sarkar NH, Golovkina T, Uz-Zaman T. RIII/Sa mice with a high incidence of mammary tumors express two exogenous strains and one potential endogenous strain of mouse mammary tumor virus. J Virol 2004; 78:1055-62. [PMID: 14694140 PMCID: PMC368770 DOI: 10.1128/jvi.78.2.1055-1062.2004] [Citation(s) in RCA: 7] [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] [Indexed: 11/20/2022] Open
Abstract
The inbred mouse strain RIII has long been known for shedding large amounts of mouse mammary tumor virus (MMTV) particles in milk and for the development of hormone-dependent early mammary tumors at a very high incidence (>90%). We have established one RIII subline (RIII/Sa) that shows a pattern of virus expression and tumor incidence similar to that in RIII mice. In the present study, we analyzed the milk and mammary tumors of RIII/Sa mice for virus characterization by reverse transcriptase PCR (RT-PCR) cloning and sequencing of the open reading frame (ORF) of the MMTV long terminal repeats (LTRs). Our results show that these mice express a mixture of at least three different MMTV strains, two of which, designated here as RIII/Sa MMTV-1 and RIII/Sa MMTV-2, are exogenous. The third virus, RIII/Sa MMTV-3, appears to carry the signature of an endogenous provirus, Mtv-17. Similar studies done with the milk and mammary glands of another subline, RIIIS/J, revealed that they do not express MMTV in their milk. The RIII/Sa and RIIIS/J mice also exhibited differences in their endogenous proviral contents. Twelve spontaneously developed mammary tumors of RIII/Sa mice were examined for possible Wnt-1 and/or int-2/Fgf3 mutations that are usually found to occur in most mouse mammary tumors as a consequence of MMTV proviral integration. This work led to the isolation of one MMTV-Wnt-1 junction fragment and one MMTV-int-2/Fgf3 junction fragment from 2 of the 12 tumors. Further analyses showed that both junction fragments contained the RIII/Sa MMTV-2-specific LTR ORF, indicating that this virus was involved in the development of both tumors. Whether RIII/Sa MMTV-1 and/or RIII/Sa MMTV-3 plays any role in mammary tumor development in RIII/Sa mice remains to be established. Overall, the present study demonstrates, to our surprise, that (i) RIII/Sa mice express, unlike other native mouse strains, three strains of MMTVs; and (ii) the virions are completely different from the virus expressed by another subline of RIII mice, the BR6 mice.
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Affiliation(s)
- Nurul H Sarkar
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia 30912, USA.
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43
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Dwenger A, Rosenthal F, Machein M, Waller C, Spyridonidis A. Transplanted Bone Marrow Cells Preferentially Home To The Vessels Of In Situ Generated Murine Tumors Rather Than Of Normal Organs. Stem Cells 2004; 22:86-92. [PMID: 14688394 DOI: 10.1634/stemcells.22-1-86] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Transplanted bone marrow-derived (BM) cells have been shown to home into the tumor vessels of s.c. implanted tumor models and to functionally contribute to tumor neoangiogenesis and tumor growth. However, whether BM cells contribute to the vessels of in situ developing tumors remains unknown. We have taken advantage of the in situ generation of mammary tumors in transgenic mice carrying the polyoma virus middle T oncogene (MMTV-PyVT) to determine whether transplanted BM cells home to and incorporate into the intratumoral vessels. Unfractionated BM from lacZ+ROSA 26 mice was used to rescue irradiated MMTV-PyVT transgenic mice or their wild-type congenics. All transgenic mice were sacrificed when they developed easily palpable mammary tumors. BM cells recruited and incorporated into the vasculature were identified by coexpression of lacZ and CD31, evidence that these cells had a distinctive, elongated appearance and that they lined the vessel structures. We found that BM cells home to and incorporate into 1.3% of the vessels of all in situ generated mammary adenocarcinomas examined (n=8). In contrast, BM cells did not recruit into the vessels of colon or liver of the tumor-bearing mice. Whether these cells contribute to new vessel formation via vasculogenesis or angiogenesis or simply attach to, and integrate into, the growing tips or shafts of pre-existing vessels has to be determined. BM could be used as a vehicle for the specific transport of antiangiogenic signals into the tumor vascular bed.
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Affiliation(s)
- Anne Dwenger
- Department of Hematology/Oncology, Freiburg University Medical Center, Freiburg, Germany
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44
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Andarawewa KL, Boulay A, Masson R, Mathelin C, Stoll I, Tomasetto C, Chenard MP, Gintz M, Bellocq JP, Rio MC. Dual stromelysin-3 function during natural mouse mammary tumor virus-ras tumor progression. Cancer Res 2003; 63:5844-9. [PMID: 14522908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
In human carcinomas, stromelysin-3/matrix metalloproteinase 11 (ST3, MMP11) expression by nonmalignant fibroblastic cells located in the immediate vicinity of cancer cells is a bad prognostic factor. Using mouse models of primary tumors, it has been demonstrated that ST3 is a key player during local invasion, favoring cancer cell survival in connective tissue through an antiapoptotic function. To investigate the ST3 impact on additional phases of cancer cell invasion, we developed mammary gland cancer prone MMTV-ras transgenic mice in wild-type (ras+/+;ST3+/+) or ST3-deficient (ras+/+;ST3-/-) genotype and studied their whole natural cancer history. The tumor-free survival and delay between the first ras oncogenic hit and primary tumor appearance increased in ras+/+;ST3-/- mice (P < 0.000001 and <0.0000007, respectively). A systematic search for occult primary tumors and metastases revealed, in addition to a lower total number and size of primary tumors (P < 0.02), an unexpected higher number of metastases (P < 0.01) in ras+/+;ST3-/- mice. Moreover, for a similar number and size of primary invasive tumors, ras+/+;ST3-/- mice developed more metastases, indicating that the cancer cells evolving in ST3-deficient stroma have an increased potential to hematogenous dissemination. We conclude that the ST3 microenvironment is a consistently active partner of invading cancer cells but that its function differs throughout cancer progression, being tumor enhancer or repressor in processes leading to local or distal invasion. Such a dual effect for an MMP might shed light, at least partially, for the absence of survival benefit for patients included in anti-MMP clinical trials.
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Affiliation(s)
- Kumari L Andarawewa
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale U184/ULP BP 163, 67404 Illkirch, Cedex, C.U. de Strasbourg, France
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45
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Freitas I, Fracchiolla S, Baronzio G, Griffini P, Bertone R, Sitar GM, Barni S, Gerzeli G, Sacco MG. Stem cell recruitment and liver de-differentiation in MMTV-neu (ErbB-2) transgenic mice. Anticancer Res 2003; 23:3783-94. [PMID: 14666678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The liver of tumor-bearing hosts manifests fetal phenotypes. We investigated the expression of differentiation markers on the liver in MMTV-neu (ErbB-2) transgenic mice, in the period from incipient neoangiogenesis to lung metastatization. We report AFP expression by hepatocytes in all lobular zones, CD34 cell arrest and subsequent hemopoiesis in periportal and mid-zone areas, oval-like cells (CD34+, CK19+, AFP+) and ductular reaction in portal tracts, portal CK19+ and GGT+ hepatoblast-like cells, and midzonal large dysplastic hepatocytes. We hypothesize that CD34 cells are recruited by the tumor from the marrow for angiogenic purposes and that their differentiation in the liver is influenced by altered liver microenvironment(s). AFP may act as a growth factor and biological response modifier for these cells and for the tumor. Dysplasia might be enhanced by metabolic stress. We conclude that the liver differentiation potential is lobular-zone-dependent and that the risk for eventually developing a pre-malignant lesion is not negligible.
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Affiliation(s)
- Isabel Freitas
- Department of Animal Biology, CNR Institute of Molecular Genetics, Session of Histochemistry and Cytometry, University of Pavia, Italy.
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46
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Uz-Zaman T, Ignatowicz L, Sarkar NH. Mouse mammary tumor viruses expressed by RIII/Sa mice with a high incidence of mammary tumors interact with the Vβ-2- and Vβ-8-specific T cells during viral infection. Virology 2003; 314:294-304. [PMID: 14517082 DOI: 10.1016/s0042-6822(03)00429-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The mouse mammary tumor viruses (MMTVs) that induce mammary adenocarcinomas in mice are transmitted from mother to offspring through milk. MMTV infection results in the deletion of specific T cells as a consequence of interaction between the MMTV-encoded superantigen (Sag) and specific V beta chains of the T cell receptor. The specificity and kinetics of T cell deletion for a number of highly oncogenic MMTVs, such as C3H- and GR-MMTVs, have been studied in great detail. Some work has also been done with the MMTVs expressed in two substrains of RIII mice, BR6 and RIIIS/J, but the nature of the interaction between T cells and the virus(es) that the parental RIII-strain of mice express has not been investigated. Since RIII mice (designated henceforth as RIII/Sa) have a very high incidence (90-98%) of mammary tumors, and they have been extensively used in studies of the biology of mammary tumor development, we have presently determined the pattern of V beta-T cell deletion caused by RIII/Sa-MMTV-Sag(s) during viral infection. T cells were isolated from lymph nodes and thymus of young RIII/Sa mice, as well as from BALB/c (BALB/cfRIII/Sa), C57BL (C57BLfRIII/Sa), and RIIIS/J (RIIIS/JfRIII/Sa) mice after they were infected with RIII/Sa-MMTV(s) by foster nursing. The composition of the T cells was analyzed by FACS using a panel of monoclonal antibodies specific to a variety of V betas. Our results show that milk-borne RIII/Sa-MMTV(s) infection leads to the deletion of CD4(+) V beta-2, and to a lesser extent V beta-8 bearing peripheral and central T cells in RIII/Sa, RIIIS/J, BALB/c, and C57BL mice. Our results are in contrast to the findings that C3H-, GR-, and BR6-MMTVs delete V beta-14- and/or V beta-15-specific T cells.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, Viral
- CD4-Positive T-Lymphocytes/metabolism
- Female
- Incidence
- Lactation
- Mammary Neoplasms, Experimental/virology
- Mammary Tumor Virus, Mouse/metabolism
- Mammary Tumor Virus, Mouse/pathogenicity
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Milk/virology
- Molecular Sequence Data
- Receptors, Antigen, T-Cell, alpha-beta/chemistry
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- Retroviridae Infections/virology
- Tumor Virus Infections/virology
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Affiliation(s)
- Taher Uz-Zaman
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, GA 30912, USA
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Holländerová D, Raslová H, Blangy D, Forstová J, Berebbi M. Interference of mouse polyomavirus with the c-myc gene and its product in mouse mammary adenocarcinomas. Int J Oncol 2003; 23:333-41. [PMID: 12851682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023] Open
Abstract
In two tumour sublines (T.wt/BL and T.wt/Bc), established from mammary adenocarcinomas caused by mouse polyoma (Py) infection of nu/nu mice, integration of polyomavirus DNA sequences into the c-myc gene locus was mapped. A complete Py genome was found to be integrated just upstream from the c-myc gene in T.wt/BL cell line, while only a part of the early Py region coding for the early proteins was inserted in the chromosomal DNA of T.wt/Bc cells. An interference of Py sequences with the regulation of c-myc gene expression gives further significance to a Py-derived tumour system that appears to be similar to some human mammary cancers in the modifications of c-myc expression. Both cell lines were found to produce truncated large T antigen and entire middle and small T antigens. In addition, production of VP1 protein was observed in the T.wt/BL cell line. The integration of polyomavirus sequences and/or expression of viral proteins caused an elevation of c-myc expression. The level of the c-myc expression was higher in both tumour cell lines in comparison with control normal murine mammary gland (NMuMG) lines, but substantially lower than in NMuMG cells infected with polyomavirus. Possible co-operation of Py proteins with c-Myc was examined. Through GST fusion protein pull-down experiments, we evidenced, that c-Myc forms a complex with the common part of the Py early antigens in the two tumour cell lines. Co-localisation of the c-myc and LT was observed in cells overexpressing c-Myc and LT.
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MESH Headings
- Adenocarcinoma/genetics
- Adenocarcinoma/virology
- Animals
- Antigens, Polyomavirus Transforming/genetics
- Antigens, Polyomavirus Transforming/metabolism
- Cell Transformation, Viral
- DNA, Neoplasm/analysis
- DNA, Viral/analysis
- Genes, myc/physiology
- Glutathione Transferase/metabolism
- Humans
- Mammary Glands, Human/physiology
- Mammary Glands, Human/virology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/virology
- Mice
- Polyomavirus/genetics
- Proto-Oncogene Proteins c-myc/genetics
- Proto-Oncogene Proteins c-myc/metabolism
- Virus Integration
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Affiliation(s)
- Dana Holländerová
- Department of Genetics and Microbiology, Charles University, Prague, Czech Republic
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48
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Li YJ, Song R, Korkola JE, Archer MC, Ben-David Y. Cyclin D1 is necessary but not sufficient for anchorage-independent growth of rat mammary tumor cells and is associated with resistance of the Copenhagen rat to mammary carcinogenesis. Oncogene 2003; 22:3452-62. [PMID: 12776197 DOI: 10.1038/sj.onc.1206411] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To identify genes associated with the resistance of Copenhagen (Cop) rats to mammary carcinogenesis, we infused a retrovirus harboring v-Ha-ras directly into the main mammary ducts of resistant F1 rats from a cross between Cop and susceptible Wistar Furth (WF) rats. Adenocarcinomas formed in approximately 50% of infused glands. Cell lines derived from these tumors were clonal, but did not share a common viral integration site, suggesting that a high level of v-Ha-ras expression was able to overcome resistance in the F1 rats. Some of the cell lines were able to grow in soft agar, but a significant number did not display anchorage-independent growth. These growth characteristics were independent of v-Ha-ras expression levels. The ability to grow in soft agar was associated with the size of tumors induced by injecting the cells into nude mice, and showed a striking positive association with the expression of cyclin D1. Furthermore, while resistance to anchorage-independent growth was fully overcome by transfection of cyclin D1 in some clones, in the others the effect was partial. A similar pattern of cyclin D1 upregulation and growth in soft agar was also observed when the cells were transfected with an active form of beta-catenin. Hybrid cells from the somatic fusion of an anchorage-dependent to an anchorage-independent clone did not grow in soft agar. These results suggest that while a high expression level of cyclin D1 is necessary for anchorage-independent growth in all clones, it is not sufficient for full growth capacity in soft agar, raising the possibility that the loss of a tumor suppressor gene in the cell lines is required to fully confer anchorage-independent growth. Our anchorage-dependent and -independent rat mammary tumor-derived cell lines may recapitulate the resistance and susceptibility of Cop and WF rats, respectively, to mammary carcinogenesis that could facilitate the identification of breast cancer susceptibility genes.
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Affiliation(s)
- You-Jun Li
- Molecular and Cell Biology Research, Sunnybrook and Women's College Health Sciences Centre, Toronto, ON, Canada
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49
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Hirasawa K, Nishikawa SG, Norman KL, Coffey MC, Thompson BG, Yoon CS, Waisman DM, Lee PWK. Systemic reovirus therapy of metastatic cancer in immune-competent mice. Cancer Res 2003; 63:348-53. [PMID: 12543787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The human reovirus is an oncolytic virus that specifically targets cancer cells with an activated Ras pathway. Because it is replication competent and highly specific for cancer cells, this virus has the potential to be an effective antimetastatic cancer agent through remote site delivery. In this study, we exploited the ability of reovirus to replicate in murine cells to test the efficacy of this virus in eliminating distal and/or metastatic tumors in immune-competent mice. We found that i.v. therapy with reovirus not only inhibited metastatic tumor growth but also led to a significant improvement in animal survival. Combining i.v. reovirus treatment with immune suppression (cyclosporine A or anti-CD4/anti-CD8 antibodies) resulted in further reduction in tumor size and a considerable prolongation in survival, compared with viral therapy alone. Combined therapy was also effective in overcoming a preexisting immunity to reovirus (a common occurrence in humans and thus a potential impediment to oncolytic effectiveness) to induce metastatic tumor regression. This is the first study to use systemic delivery of an oncolytic agent in conjunction with immune-suppressive drugs to effectively prolong animal survival. Altogether, our results suggest that i.v. reovirus therapy may present a feasible, novel alternative in the treatment of metastatic cancer in humans.
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MESH Headings
- Animals
- Carcinoma, Lewis Lung/therapy
- Carcinoma, Lewis Lung/virology
- Combined Modality Therapy
- Cyclosporine/pharmacology
- Cytopathogenic Effect, Viral
- Disease Models, Animal
- Female
- Immunosuppressive Agents/pharmacology
- Lung Neoplasms/secondary
- Lung Neoplasms/therapy
- Lung Neoplasms/virology
- Mammary Neoplasms, Experimental/therapy
- Mammary Neoplasms, Experimental/virology
- Mice
- Mice, Inbred C3H
- Mice, Inbred C57BL
- Neoplasms, Experimental/therapy
- Neoplasms, Experimental/virology
- Retroviridae/immunology
- Retroviridae/physiology
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Affiliation(s)
- Kensuke Hirasawa
- Cancer Biology Research Group and Departments of Microbiology and Infectious Diseases, University of Calgary, School of Medicine, Calgary, Alberta, T2N 4N1 Canada
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50
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Affiliation(s)
- Emmett V Schmidt
- Massachusetts General Hospital Cancer Center, Building 149, 7th Floor, 13th Street, Charlestown, MA 02129, USA.
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