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Dutt M, Mahmoud LM, Chamusco K, Stanton D, Chase CD, Nielsen E, Quirico M, Yu Q, Gmitter FG, Grosser JW. Utilization of somatic fusion techniques for the development of HLB tolerant breeding resources employing the Australian finger lime (Citrus australasica). PLoS One 2021; 16:e0255842. [PMID: 34375348 PMCID: PMC8354479 DOI: 10.1371/journal.pone.0255842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 07/23/2021] [Indexed: 11/18/2022] Open
Abstract
The Australian finger lime is a unique citrus species that has gained importance due to its unique fruit characteristics and perceived tolerance to Huanglongbing (HLB), an often-fatal disease of citrus trees. In this study, we developed allotetraploid finger lime hybrids and cybrids by utilizing somatic cell fusion techniques to fuse diploid ‘OLL8’ sweet orange or ‘Page’ tangelo callus-derived protoplasts with finger lime (FL) mesophyll-derived protoplasts. Six somatic fusions were regenerated from the ‘OLL8’ + FL fusion, while three putative cybrids were regenerated from the ‘Page’ + FL fusion. Ploidy levels and nuclear-expressed sequence tag derived simple sequence repeat (EST-SSR) markers confirmed the somatic hybrid production, and mitochondrial DNA primer sets confirmed the cybrid nature. Several trees produced by the somatic fusion remained HLB negative even after 6 years of growth in an HLB-endemic environment. Pathogenesis related (PR) and other genes that are often upregulated in HLB-tolerant trees were also upregulated in our somatic fusions. These newly developed somatic fusions and cybrids could potentially be used as breeding parents to develop the next generation of improved HLB-tolerant rootstocks and scions.
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Affiliation(s)
- Manjul Dutt
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
- * E-mail:
| | - Lamiaa M. Mahmoud
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
- Faculty of Agriculture, Pomology Department, Mansoura University, Mansoura, Egypt
| | - Karen Chamusco
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States of America
| | - Daniel Stanton
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
| | - Christine D. Chase
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States of America
| | - Ethan Nielsen
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
| | - Maria Quirico
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
| | - Qibin Yu
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
| | - Frederick G. Gmitter
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
| | - Jude W. Grosser
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States of America
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Brito A, Merle C, Lagarde P, Faustin B, Devin A, Lartigue L, Chibon F. Cell fusion enhances energy metabolism of mesenchymal tumor hybrid cells to sustain their proliferation and invasion. BMC Cancer 2021; 21:863. [PMID: 34320948 PMCID: PMC8317390 DOI: 10.1186/s12885-021-08561-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 06/09/2021] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Cell-to-cell fusion is emerging as a key element of the metastatic process in various cancer types. We recently showed that hybrids made from the spontaneous merging of pre-malignant (IMR90 E6E7, i.e. E6E7) and malignant (IMR90 E6E7 RST, i.e. RST) mesenchymal cells recapitulate the main features of human undifferentiated pleomorphic sarcoma (UPS), with a highly rearranged genome and increased spreading capacities. To better characterize the intrinsic properties of these hybrids, we investigated here their metabolic energy profile compared to their parents. RESULTS Our results unveiled that hybrids harbored a Warburg-like metabolism, like their RST counterparts. However, hybrids displayed a much greater metabolic activity, enhancing glycolysis to proliferate. Interestingly, modifying the metabolic environmental conditions through the use of 5-aminoimidazole-4-carbox-amide-1-β-D-ribofuranoside (AICAR), an activator of the 5'-adenosine monophosphate (AMP)-activated protein kinase (AMPK), specifically reduced the growth of hybrids, and also abrogated the invasive capacity of hybrids displaying enhanced glycolysis. Furthermore, AICAR efficiently blocked the tumoral features related to the aggressiveness of human UPS cell lines. CONCLUSION Altogether, our findings strongly suggest that hybrids rely on higher energy flux to proliferate and that a drug altering this metabolic equilibrium could impair their survival and be potentially considered as a novel therapeutic strategy.
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Affiliation(s)
- Ariadna Brito
- Cancer Research Center in Toulouse (CRCT), INSERM U1037, 31037, Toulouse, France
- University of Toulouse 3, Paul Sabatier, 118 route Narbonne, 31062 Cedex 9, Toulouse, France
| | - Candice Merle
- Cancer Research Center in Toulouse (CRCT), INSERM U1037, 31037, Toulouse, France
- University of Toulouse 3, Paul Sabatier, 118 route Narbonne, 31062 Cedex 9, Toulouse, France
| | - Pauline Lagarde
- INSERM U1218, 299 cours de l'Argonne, F-33076, Bordeaux, France
- University of Bordeaux, 146 rue Léo Saignat, F-33000, Bordeaux, France
- Department of Biopathology, Bergonie Institute, 229 cours de l'Argonne, F-33076, Bordeaux, France
| | - Benjamin Faustin
- CNRS UMR 5164, 33000, Bordeaux, France
- Immunology Discovery, Janssen Research and Development, San Diego, CA, USA
| | - Anne Devin
- CNRS UMR 5095, 1 Rue Camille Saint-Saëns, F-33077, Bordeaux Cedex, France
| | - Lydia Lartigue
- INSERM U1218, 299 cours de l'Argonne, F-33076, Bordeaux, France
- University of Bordeaux, 146 rue Léo Saignat, F-33000, Bordeaux, France
| | - Frederic Chibon
- Cancer Research Center in Toulouse (CRCT), INSERM U1037, 31037, Toulouse, France.
- INSERM U1218, 299 cours de l'Argonne, F-33076, Bordeaux, France.
- Department of Biopathology, Bergonie Institute, 229 cours de l'Argonne, F-33076, Bordeaux, France.
- Department of Pathology, Institut Claudius Régaud, IUCT-Oncopole, Toulouse, France.
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Siemionow M, Szilagyi E, Cwykiel J, Domaszewska-Szostek A, Heydemann A, Garcia-Martinez J, Siemionow K. Transplantation of Dystrophin Expressing Chimeric Human Cells of Myoblast/Mesenchymal Stem Cell Origin Improves Function in Duchenne Muscular Dystrophy Model. Stem Cells Dev 2021; 30:190-202. [PMID: 33349121 DOI: 10.1089/scd.2020.0161] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is a lethal X-linked disorder caused by mutations in dystrophin gene. Currently, there is no cure for DMD. Cell therapies are challenged by limited engraftment and rejection. Thus, more effective and safer therapeutic approaches are needed for DMD. We previously reported increased dystrophin expression correlating with improved function after transplantation of dystrophin expressing chimeric (DEC) cells of myoblast origin in the mdx mouse models of DMD. This study established new DEC cell line of myoblasts and mesenchymal stem cells (MSC) origin and tested its efficacy and therapeutic potential in mdx/scid mouse model of DMD. Fifteen ex vivo cell fusions of allogenic human myoblast [normal myoblasts (MBN)] and normal human bone marrow-derived MSC (MSCN) from normal donors were performed using polyethylene glycol. Flow cytometry, confocal microscopy, polymerase chain reaction (PCR)-short tandem repeats, polymerase chain reaction-reverse sequence-specific oligonucleotide probe assessed chimeric state of fused MBN/MSCN DEC cells, whereas Comet assay assessed fusion procedure safety testing genotoxicity. Immunofluorescence and real-time PCR assessed dystrophin expression and myogenic differentiation. Mixed lymphocyte reaction (MLR) evaluated DEC's immunogenicity. To test MBN/MSCN DEC efficacy in vivo, gastrocnemius muscle of mdx/scid mice were injected with vehicle (n = 12), nonfused MBN and MSCN (n = 9, 0.25 × 106/each) or MBN/MSCN DEC (n = 9, 0.5 × 106). Animals were evaluated for 90 days using ex vivo and in vivo muscle strength tests. Histology and immunofluorescence staining assessed dystrophin expression, centrally nucleated fibers and scar tissue formation. Post-fusion, MBN/MSCN DEC chimeric state, myogenic differentiation, and dystrophin expression were confirmed. MLR reveled reduced DEC's immune response compared with controls (P < 0.05). At 90 days post-DEC transplant, increase in dystrophin expression (20.26% ± 2.5%, P < 0.05) correlated with improved muscle strength and function in mdx/scid mice. The created human MBN/MSCN DEC cell line introduces novel therapeutic approach combining myogenic and immunomodulatory properties of MB and MSC, and as such may open a universal approach for muscle regeneration in DMD.
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MESH Headings
- Animals
- Cell Differentiation/genetics
- Cell Fusion
- Cells, Cultured
- Disease Models, Animal
- Dystrophin/genetics
- Dystrophin/metabolism
- Gene Expression
- Humans
- Hybrid Cells/cytology
- Hybrid Cells/metabolism
- Hybrid Cells/transplantation
- Mesenchymal Stem Cells/cytology
- Mesenchymal Stem Cells/metabolism
- Mice, Inbred C57BL
- Mice, Inbred mdx
- Mice, SCID
- Muscle, Skeletal/cytology
- Muscular Dystrophy, Duchenne/genetics
- Muscular Dystrophy, Duchenne/physiopathology
- Muscular Dystrophy, Duchenne/therapy
- Myoblasts/cytology
- Myoblasts/metabolism
- Stem Cell Transplantation/methods
- Transplantation, Heterologous
- Mice
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Affiliation(s)
- Maria Siemionow
- Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Erzsebet Szilagyi
- Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Joanna Cwykiel
- Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Anna Domaszewska-Szostek
- Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois, USA
- Department of Human Epigenetics, Mossakowski Medical Research Center Polish Academy of Science, Warsaw, Poland
| | - Ahlke Heydemann
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Jesus Garcia-Martinez
- Department of Clinical Health Sciences, Saint Louis University, Saint Louis, Missouri, USA
| | - Krzysztof Siemionow
- Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois, USA
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Druzhkova I, Shirmanova M, Ignatova N, Dudenkova V, Lukina M, Zagaynova E, Safina D, Kostrov S, Didych D, Kuzmich A, Sharonov G, Rakitina O, Alekseenko I, Sverdlov E. Expression of EMT-Related Genes in Hybrid E/M Colorectal Cancer Cells Determines Fibroblast Activation and Collagen Remodeling. Int J Mol Sci 2020; 21:ijms21218119. [PMID: 33143259 PMCID: PMC7662237 DOI: 10.3390/ijms21218119] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/22/2020] [Accepted: 10/27/2020] [Indexed: 12/13/2022] Open
Abstract
Collagen, the main non-cellular component of the extracellular matrix (ECM), is profoundly reorganized during tumorigenesis and has a strong impact on tumor behavior. The main source of collagen in tumors is cancer-associated fibroblasts. Cancer cells can also participate in the synthesis of ECM; however, the contribution of both types of cells to collagen rearrangements during the tumor progression is far from being clear. Here, we investigated the processes of collagen biosynthesis and remodeling in parallel with the transcriptome changes during cancer cells and fibroblasts interactions. Combining immunofluorescence, RNA sequencing, and second harmonic generation microscopy, we have explored the relationships between the ratio of epithelial (E) and mesenchymal (M) components of hybrid E/M cancer cells, their ability to activate fibroblasts, and the contributions of both cell types to collagen remodeling. To this end, we studied (i) co-cultures of colorectal cancer cells and normal fibroblasts in a collagen matrix, (ii) patient-derived cancer-associated fibroblasts, and (iii) mouse xenograft models. We found that the activation of normal fibroblasts that form dense collagen networks consisting of large, highly oriented fibers depends on the difference in E/M ratio in the cancer cells. The more-epithelial cells activate the fibroblasts more strongly, which correlates with a dense and highly ordered collagen structure in tumors in vivo. The more-mesenchymal cells activate the fibroblasts to a lesser degree; on the other hand, this cell line has a higher innate collagen remodeling capacity. Normal fibroblasts activated by cancer cells contribute to the organization of the extracellular matrix in a way that is favorable for migratory potency. At the same time, in co-culture with epithelial cancer cells, the contribution of fibroblasts to the reorganization of ECM is more pronounced. Therefore, one can expect that targeting the ability of epithelial cancer cells to activate normal fibroblasts may provide a new anticancer therapeutic strategy.
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Affiliation(s)
- Irina Druzhkova
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
| | - Marina Shirmanova
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
| | - Nadezhda Ignatova
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
| | - Varvara Dudenkova
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
| | - Maria Lukina
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
| | - Elena Zagaynova
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
- Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia
| | - Dina Safina
- Department of Molecular-Genetic Basis of Biotechnology and Protein Engineering, Institute of Molecular Genetics of National Research Centre «Kurchatov Institute», 123182 Moscow, Russia; (D.S.); (S.K.); (I.A.); (E.S.)
| | - Sergey Kostrov
- Department of Molecular-Genetic Basis of Biotechnology and Protein Engineering, Institute of Molecular Genetics of National Research Centre «Kurchatov Institute», 123182 Moscow, Russia; (D.S.); (S.K.); (I.A.); (E.S.)
| | - Dmitry Didych
- Department of Genomics and Postgenomic Technologies, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of The Russian Academy of Sciences, 117997 Moscow, Russia; (D.D.); (O.R.)
| | - Alexey Kuzmich
- Department of Molecular-Genetic Basis of Biotechnology and Protein Engineering, Institute of Molecular Genetics of National Research Centre «Kurchatov Institute», 123182 Moscow, Russia; (D.S.); (S.K.); (I.A.); (E.S.)
- Department of Genomics and Postgenomic Technologies, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of The Russian Academy of Sciences, 117997 Moscow, Russia; (D.D.); (O.R.)
- Correspondence:
| | - George Sharonov
- Research Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (I.D.); (M.S.); (N.I.); (V.D.); (M.L.); (E.Z.); (G.S.)
- Department of Genomics and Postgenomic Technologies, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of The Russian Academy of Sciences, 117997 Moscow, Russia; (D.D.); (O.R.)
- Institute of Translational Medicine, Pirogov Russian National Research Medical University, 117997 Moscow, Russia
| | - Olga Rakitina
- Department of Genomics and Postgenomic Technologies, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of The Russian Academy of Sciences, 117997 Moscow, Russia; (D.D.); (O.R.)
| | - Irina Alekseenko
- Department of Molecular-Genetic Basis of Biotechnology and Protein Engineering, Institute of Molecular Genetics of National Research Centre «Kurchatov Institute», 123182 Moscow, Russia; (D.S.); (S.K.); (I.A.); (E.S.)
- Department of Genomics and Postgenomic Technologies, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of The Russian Academy of Sciences, 117997 Moscow, Russia; (D.D.); (O.R.)
- Laboratory of Epigenetics, FSBI «National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I. Kulakov» Ministry of Healthcare of the Russian Federation, 117198 Moscow, Russia
| | - Eugene Sverdlov
- Department of Molecular-Genetic Basis of Biotechnology and Protein Engineering, Institute of Molecular Genetics of National Research Centre «Kurchatov Institute», 123182 Moscow, Russia; (D.S.); (S.K.); (I.A.); (E.S.)
- National Research Center «Kurchatov Institute», 123182 Moscow, Russia
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5
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Collins DP, Hapke JH, Aravalli RN, Steer CJ. Development of immortalized human hepatocyte-like hybrid cells by fusion of multi-lineage progenitor cells with primary hepatocytes. PLoS One 2020; 15:e0234002. [PMID: 32497071 PMCID: PMC7272032 DOI: 10.1371/journal.pone.0234002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/15/2020] [Indexed: 11/30/2022] Open
Abstract
Human primary hepatocytes (PHs) are critical to studying liver functions, drug metabolism and toxicity. PHs isolated from livers that are unacceptable for transplantation have limited expansion and culture viability in vitro, in addition to rapidly deteriorating enzymatic functions. The unsuitability of immortalized hepato-carcinoma cell lines for this function has prompted studies to develop hepatocyte-like cells from alternative sources like ESC, iPS, and other stem cell types using differentiation protocols. This study describes a novel technique to produce expandable and functional hepatocyte-like cells from the fusion of an immortalized human umbilical cord blood derived cell line (E12 MLPC) to normal human primary hepatocytes. Multi-lineage progenitor cells (MLPC) comprise a small subset of mesenchymal-like cells isolated from human umbilical cord blood. MLPC are distinguishable from other mesenchymal-like cells by their extended expansion capacity (up to 80 cell doublings before senescence) and the ability to be differentiated into cells representative of endo-, meso- and ectodermal origins. Transfection of MLPC with the gene for telomerase reverse transcriptase (TERT) resulted in clonal cell lines that were capable of differentiation to different cellular outcomes while maintaining their functional immortality. A methodology for the development of immortalized hepatocyte-like hybrid cells by the in vitro fusion of human MLPC with normal human primary hepatocytes is reported. The resultant hybrid cells exhibited homology with hepatocytes by morphology, immunohistochemistry, urea and albumin production and gene expression. A medium that allows stable long-term expansion of hepatocyte-like fusion cells is described.
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Affiliation(s)
| | - Joel H. Hapke
- CMDG, LLC, Saint Paul, Minnesota, United States of America
| | - Rajagopal N. Aravalli
- Department of Electrical and Computer Engineering, College of Science and Engineering, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Clifford J. Steer
- Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
- Department of Genetics, Cell Biology and Development, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
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Kong M, Xiang H, Wang J, Liu J, Zhang X, Zhao X. Mitochondrial DNA Haplotypes Influence Energy Metabolism across Chicken Transmitochondrial Cybrids. Genes (Basel) 2020; 11:genes11010100. [PMID: 31963157 PMCID: PMC7017162 DOI: 10.3390/genes11010100] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 11/16/2022] Open
Abstract
The association between mitochondrial DNA haplotype and productive performances has been widely reported in chicken breeds. However, there has not been physiological evidence of this seen previously. In this study, chicken transmitochondrial cells were generated using the nucleus of the DF-1 cell line and mitochondria of primary cell lines derived from two native chicken breeds, Tibetan chicken and Shouguang chicken. Generally, Tibetan chicken primary cells showed a stronger metabolic capacity than Shouguang chicken primary cells. However, the Tibetan chicken cybrids had a dramatic drop in relative mtDNA copies and oxygen consumption. Higher rates of oxygen consumption (OCR) and expression levels of mitochondrial biogenesis and fusion genes were observed in Shouguang chicken cybrids, potentially reflecting that the mitochondrial DNA haplotype of Shouguang chicken had better coordination with the DF-1 nucleus than others. Meanwhile, mitonuclear incompatibility occurred in Tibetan chicken cybrids. The results demonstrate functional differences among mitochondrial DNA haplotypes and may shed light on the interaction between the mitochondria and nucleus in Gallus gallus domesticus.
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Affiliation(s)
- Minghua Kong
- National Engineering Laboratory for Animal Breeding; Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture; College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
| | - Hai Xiang
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528225, China;
| | - Jikun Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Sichuan Province and Ministry of Education, Southwest Minzu University, Chengdu 610041, China;
| | - Jian Liu
- Guizhou Nayong Professor Workstation, Bijie 553300, China; (J.L.); (X.Z.)
| | - Xiben Zhang
- Guizhou Nayong Professor Workstation, Bijie 553300, China; (J.L.); (X.Z.)
- Institute of Animal Husbandry and Veterinary Medicine, Bijie 551700, China
| | - Xingbo Zhao
- National Engineering Laboratory for Animal Breeding; Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture; College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
- Guizhou Nayong Professor Workstation, Bijie 553300, China; (J.L.); (X.Z.)
- Correspondence: ; Tel.: +86-010-62733417; Fax: +86-010-62733417
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7
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Ishikawa K, Kobayashi K, Yamada A, Umehara M, Oka T, Nakada K. Concentration of mitochondrial DNA mutations by cytoplasmic transfer from platelets to cultured mouse cells. PLoS One 2019; 14:e0213283. [PMID: 30830936 PMCID: PMC6398856 DOI: 10.1371/journal.pone.0213283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 09/05/2018] [Accepted: 02/18/2019] [Indexed: 01/11/2023] Open
Abstract
Accumulation of mutations in mitochondrial DNA (mtDNA) is thought to be responsible for mitochondrial, and other, diseases and biological phenomena, such as diabetes, cancer, neurodegenerative diseases, and aging. Mouse models may elucidate the relationship between mutations in mtDNA and these abnormalities. However, because of the difficulty of mtDNA manipulation, generation of mouse models has not sufficiently progressed to enable such studies. To overcome this difficulty and to establish a source of diverse mtDNA mutations, we here generated cultured mouse cells containing mtDNA derived from an mtDNA mutator mouse that accumulates random mtDNA mutations with age. Mutation analysis of the obtained transmitochondrial cytoplasmic hybrid cells (cybrids) revealed that the cells harbored diverse mtDNA mutations occurring at a higher frequency than in mouse tissues, and exhibited severe respiration defects that would be lethal in tissues or organs. Abnormal respiratory complex formation and high stress on the mitochondrial protein quality control system appeared to be involved in these severe respiration defects. The mutation rates of the majority of highly accumulated mutations converged to either approximately 5%, 10%, or 40%, suggesting that these mutations are linked on the respective mtDNA molecules, and mtDNA in cybrid cells likely consisted of mtDNA molecules clonally expanded from the small population of introduced mtDNAs. Thus, the linked mutations in these cybrid cells cannot be evaluated individually. In addition, mtDNA mutations homologous to confirmed pathogenic mutations in human were rarely observed in our generated cybrids. However, the transmitochondrial cybrids constitute a useful tool for concentrating pathogenic mtDNA mutations and as a source of diverse mtDNA mutations to elucidate the relationship between mtDNA mutations and diseases.
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Affiliation(s)
- Kaori Ishikawa
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
- * E-mail: (KI); (KN)
| | - Kohei Kobayashi
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
| | - Akihito Yamada
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
| | - Moe Umehara
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
| | - Toshihiko Oka
- Department of Life Science, Rikkyo University, Nishi-Ikebukuro, Toshima-ku, Tokyo, Japan
| | - Kazuto Nakada
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki, Japan
- * E-mail: (KI); (KN)
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Abstract
Current strategies to determine tumor × normal (TN)-hybrid cells among human cancer cells include the detection of hematopoietic markers and other mesodermal markers on tumor cells or the presence of donor DNA in cancer samples from patients who had previously received an allogenic bone marrow transplant. By doing so, several studies have demonstrated that TN-hybrid cells could be found in human cancers. However, a prerequisite of this cell fusion search strategy is that such markers are stably expressed by TN-hybrid cells over time. However, cell fusion is a potent inducer of genomic instability, and TN-hybrid cells may lose these cell fusion markers, thereby becoming indistinguishable from nonfused tumor cells. In addition, hybrid cells can evolve from homotypic fusion events between tumor cells or from heterotypic fusion events between tumor cells and normal cells possessing similar markers, which would also be indistinguishable from nonfused tumor cells. Such indistinguishable or invisible hybrid cells will be referred to as dark matter hybrids, which cannot as yet be detected and quantified, but which contribute to tumor growth and progression.
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Affiliation(s)
- Julian Weiler
- Chair of Immunology, Center for Biomedical Education and Research (ZBAF), Witten/Herdecke University, Stockumer Str. 10, 58448 Witten, Germany.
| | - Thomas Dittmar
- Chair of Immunology, Center for Biomedical Education and Research (ZBAF), Witten/Herdecke University, Stockumer Str. 10, 58448 Witten, Germany.
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Esteves AR, Filipe F, Magalhães JD, Silva DF, Cardoso SM. The Role of Beclin-1 Acetylation on Autophagic Flux in Alzheimer's Disease. Mol Neurobiol 2019; 56:5654-5670. [PMID: 30661206 DOI: 10.1007/s12035-019-1483-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/10/2019] [Indexed: 01/25/2023]
Abstract
Macroautophagy impairment plays a key role in sporadic Alzheimer's disease (sAD) neurodegenerative process. Nevertheless, the mechanism(s) that lead to a deficiency in macroautophagy in AD remains elusive. In this work, we identify, for the first time that Beclin-1 acetylation status is implicated in the alterations in autophagy observed in AD neurodegeneration. We observed that Beclin-1 is deacetylated by sirtuin 1 (SIRT1) and acetylated by p300. In addition, Beclin-1 acetylation inhibits autophagosome maturation, leading to impairment in autophagic flux. We also analyzed some proteins known to be involved in the maturation of autophagosomes such as Rab7, which participates in the fusion step with lysosomes. We observed that increased expression of Rab7 might represent a response to boost the formation of large perinuclear lysosome clusters in accordance with an increase in lysosomal biogenesis determined by increase in LAMP-2A, LAMP-1, and cathepsin D expression in AD cells. Thus, our data provides strong evidences that Beclin-1 acetylation impairs the autophagic flux, and despite lysosomal biogenesis seems to be triggered as a compensatory response, autophagosome fusion with lysosomes is compromised contributing to AD neurodegeneration.
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Affiliation(s)
- A Raquel Esteves
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Filipa Filipe
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - João D Magalhães
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Diana F Silva
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Sandra M Cardoso
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.
- Institute of Cellular and Molecular Biology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
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Sinyov VV, Sazonova MA, Karagodin VP, Ryzhkova AI, Galitsyna EV, Melnichenko AA, Demakova NA, Shkurat TP, Sobenin IA, Orekhov AN. [Study of mitochondrial dysfunction using cytoplasmic hybrid]. Patol Fiziol Eksp Ter 2017; 61:92-97. [PMID: 29215849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Aim. This review article describes literature sources devoted to the investigation of mitochondrial dysfunction using cytoplasmic hybrids (cybrids). The presented studies were carried out on cultures of cybrid cell lines HL60, MOL T-4, A549, 143B, HeLa, Arpe-19, HEK-293, SH-SY5Y and NT2. According to the analysis of scientific world literature, some of the most promising models for studying mitochondrial dysfunction are cell cultures without mitochondria (rho0) and cytoplasmic hybrids containing one or several mutations of mitochondrial genome. In the review scientific researches on studying biochemical and molecular cellular pathological processes in cybrid cells in various human diseases such as Alzheimer's disease and mild cognitive impairment, MERRF and MELAS syndromes, Leber's optic atrophy and Parkinson's disease were considered. Material dedicated to cybrids as potential models for the study of treatment possibilities was presented separately. Conclusion. The analyzed in the review rho0-cell cultures and cybrid lines containing mtDNA mutations may be models for the study of mitochondrial genome dysfunctions, biochemical and molecular cellular pathological processes. It is worth noting that in various cell cultures, similar tendencies are observed in functional activity changes of rho0-cell and cybrids compared with native cell lines. For example, such tendencies as reduction of oxygen consumption level, morphological changes of mitochondrial structure, resistance to apoptosis, reduction of ATP consumption level, increase in glucose consumption, activity deterioration of some respiratory chain complexes.
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Kandpal RP, Sandhu AK, Kaur G, Kaur GP, Athwal RS. Monochromosomal Hybrids and Chromosome Transfer: A Functional Approach for Gene Identification. Cancer Genomics Proteomics 2017; 14:93-101. [PMID: 28387649 PMCID: PMC5369314 DOI: 10.21873/cgp.20022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/19/2017] [Accepted: 02/22/2017] [Indexed: 11/10/2022] Open
Abstract
Functional complementation of cellular defects has been a valuable approach for localizing causative genes to specific chromosomes. The complementation strategy was followed by positional cloning and characterization of genes for their biological relevance. We herein describe strategies used for the construction of monochromosomal hybrids and their applications for cloning and characterization of genes related to cell growth, cell senescence and DNA repair. We have cloned RNaseT2, GluR6 (glutamate ionotropic receptor kainate type subunit 2-GRIK2) and protein tyrosine phosphatase, receptor type K (PTPRK) genes using these strategies.
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Affiliation(s)
- Raj P Kandpal
- Department of Basic Medical Sciences, Western University of Health Sciences, Pomona, CA, U.S.A.
| | - Arbans K Sandhu
- Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA, U.S.A
| | - Gurpreet Kaur
- Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA, U.S.A
| | - Gursurinder P Kaur
- Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA, U.S.A
| | - Raghbir S Athwal
- Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA, U.S.A.
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12
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Nashine S, Chwa M, Kazemian M, Thaker K, Lu S, Nesburn A, Kuppermann BD, Kenney MC. Differential Expression of Complement Markers in Normal and AMD Transmitochondrial Cybrids. PLoS One 2016; 11:e0159828. [PMID: 27486856 PMCID: PMC4972370 DOI: 10.1371/journal.pone.0159828] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 07/09/2016] [Indexed: 12/19/2022] Open
Abstract
Purpose Variations in mitochondrial DNA (mtDNA) and abnormalities in the complement pathways have been implicated in the pathogenesis of age-related macular degeneration (AMD). This study was designed to determine the effects of mtDNA from AMD subjects on the complement pathway. Methods Transmitochondrial cybrids were prepared by fusing platelets from AMD and age-matched Normal subjects with Rho0 (lacking mtDNA) human ARPE-19 cells. Quantitative PCR and Western blotting were performed to examine gene and protein expression profiles, respectively, of complement markers in these cybrids. Bioenergetic profiles of Normal and AMD cybrids were examined using the Seahorse XF24 flux analyzer. Results Significant decreases in the gene and protein expression of complement inhibitors, along with significantly higher levels of complement activators, were found in AMD cybrids compared to Older-Normal cybrids. Seahorse flux data demonstrated that the bioenergetic profiles for Older-Normal and Older-AMD cybrid samples were similar to each other but were lower compared to Young-Normal cybrid samples. Conclusion In summary, since all cybrids had identical nuclei and differed only in mtDNA content, the observed changes in components of complement pathways can be attributed to mtDNA variations in the AMD subjects, suggesting that mitochondrial genome and retrograde signaling play critical roles in this disease. Furthermore, the similar bioenergetic profiles of AMD and Older-Normal cybrids indicate that the signaling between mitochondria and nuclei are probably not via a respiratory pathway.
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Affiliation(s)
- Sonali Nashine
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
| | - Marilyn Chwa
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
| | - Mina Kazemian
- College of Osteopathic Medicine, Touro University Nevada, Nevada, United States of America
| | - Kunal Thaker
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
| | - Stephanie Lu
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
- VA Medical Center Long Beach Hospital, Long Beach, California, United States of America
| | - Anthony Nesburn
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
- Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Baruch D. Kuppermann
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
| | - M. Cristina Kenney
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America
- Department of Pathology and Laboratory Medicine, University of California Irvine, Irvine, California, United States of America
- * E-mail:
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Tosun S, Fried S, Niggemann B, Zänker KS, Dittmar T. Hybrid Cells Derived from Human Breast Cancer Cells and Human Breast Epithelial Cells Exhibit Differential TLR4 and TLR9 Signaling. Int J Mol Sci 2016; 17:ijms17050726. [PMID: 27187369 PMCID: PMC4881548 DOI: 10.3390/ijms17050726] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 04/15/2016] [Accepted: 05/03/2016] [Indexed: 02/07/2023] Open
Abstract
TLRs are important receptors of cells of the innate immune system since they recognize various structurally conserved molecular patterns of different pathogens as well as endogenous ligands. In cancer, the role of TLRs is still controversial due to findings that both regression and progression of tumors could depend on TLR signaling. In the present study, M13SV1-EGFP-Neo human breast epithelial cells, MDA-MB-435-Hyg human breast cancer cells and two hybrids M13MDA435-1 and -3 were investigated for TLR4 and TLR9 expression and signaling. RT-PCR data revealed that LPS and CpG-ODN induced the expression of pro-inflammatory cytokines, like IFN-β, TNF-α, IL-1β and IL-6 in hybrid cells, but not parental cells. Interestingly, validation of RT-PCR data by Western blot showed detectable protein levels solely after LPS stimulation, suggesting that regulatory mechanisms are also controlled by TLR signaling. Analysis of pAKT and pERK1/2 levels upon LPS and CpG-ODN stimulation revealed a differential phosphorylation pattern in all cells. Finally, the migratory behavior of the cells was investigated showing that both LPS and CpG-ODN potently blocked the locomotory activity of the hybrid cells in a dose-dependent manner. In summary, hybrid cells exhibit differential TLR4 and TLR9 signaling.
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Affiliation(s)
- Songül Tosun
- Institute of Immunology & Experimental Oncology, Center for Biomedical Education and Research (ZBAF), University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
| | - Sabrina Fried
- Institute of Immunology & Experimental Oncology, Center for Biomedical Education and Research (ZBAF), University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
- Faculty of Medicine, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany.
| | - Bernd Niggemann
- Institute of Immunology & Experimental Oncology, Center for Biomedical Education and Research (ZBAF), University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
| | - Kurt S Zänker
- Institute of Immunology & Experimental Oncology, Center for Biomedical Education and Research (ZBAF), University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
| | - Thomas Dittmar
- Institute of Immunology & Experimental Oncology, Center for Biomedical Education and Research (ZBAF), University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
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McKenzie M, Duchen MR. Impaired Cellular Bioenergetics Causes Mitochondrial Calcium Handling Defects in MT-ND5 Mutant Cybrids. PLoS One 2016; 11:e0154371. [PMID: 27110715 PMCID: PMC4844100 DOI: 10.1371/journal.pone.0154371] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 04/12/2016] [Indexed: 11/18/2022] Open
Abstract
Mutations in mitochondrial DNA (mtDNA) can cause mitochondrial disease, a group of metabolic disorders that affect both children and adults. Interestingly, individual mtDNA mutations can cause very different clinical symptoms, however the factors that determine these phenotypes remain obscure. Defects in mitochondrial oxidative phosphorylation can disrupt cell signaling pathways, which may shape these disease phenotypes. In particular, mitochondria participate closely in cellular calcium signaling, with profound impact on cell function. Here, we examined the effects of a homoplasmic m.13565C>T mutation in MT-ND5 on cellular calcium handling using transmitochondrial cybrids (ND5 mutant cybrids). We found that the oxidation of NADH and mitochondrial membrane potential (Δψm) were significantly reduced in ND5 mutant cybrids. These metabolic defects were associated with a significant decrease in calcium uptake by ND5 mutant mitochondria in response to a calcium transient. Inhibition of glycolysis with 2-deoxy-D-glucose did not affect cytosolic calcium levels in control cybrids, but caused an increase in cytosolic calcium in ND5 mutant cybrids. This suggests that glycolytically-generated ATP is required not only to maintain Δψm in ND5 mutant mitochondria but is also critical for regulating cellular calcium homeostasis. We conclude that the m.13565C>T mutation in MT-ND5 causes defects in both mitochondrial oxidative metabolism and mitochondrial calcium sequestration. This disruption of mitochondrial calcium handling, which leads to defects in cellular calcium homeostasis, may be an important contributor to mitochondrial disease pathogenesis.
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Affiliation(s)
- Matthew McKenzie
- Centre for Genetic Diseases, Hudson Institute of Medical Research, Clayton, Melbourne, Victoria 3168, Australia
- The Department of Molecular and Translational Science, Monash University, Clayton, Melbourne, Victoria 3168, Australia
- * E-mail:
| | - Michael R. Duchen
- Department of Physiology, University College London, Gower St, London, UK WC1E6BT
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15
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Nakamura Y, Kitada M, Satoh F, Maekawa T, Morimoto R, Yamazaki Y, Ise K, Gomez-Sanchez CE, Ito S, Arai Y, Dezawa M, Sasano H. Intratumoral heterogeneity of steroidogenesis in aldosterone-producing adenoma revealed by intensive double- and triple-immunostaining for CYP11B2/B1 and CYP17. Mol Cell Endocrinol 2016; 422:57-63. [PMID: 26597777 PMCID: PMC4827777 DOI: 10.1016/j.mce.2015.11.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 11/10/2015] [Accepted: 11/11/2015] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Cytochrome P450 11B2 (CYP11B2) plays a pivotal role in aldosterone synthesis, while cytochrome P450 11B1 (CYP11B1) and cytochrome P450 17A1 (CYP17) are involved in cortisol synthesis in normal human adrenal glands. However, their detailed distribution in aldosterone-producing adenoma (APA) remains incompletely settled. MATERIALS AND METHODS We examined the status of CYP11B1/CYP11B2 and CYP11B2/CYP17A1 expressions in 27 APA (double staining) cases and 21 APA (triple staining) cases by using immunofluorescence staining and semi-quantitative evaluation. RESULTS Tumor cells co-expressing CYP11B1/B2 (hybrid cell type A), CYP11B2/17 (hybrid cell type B), CYP11B1/17 (hybrid cell type C), and CYP11B1/B2/17 (triple-positive cell) were identified. The area and cell number of these cells were relatively small, but the size of individual hybrid cells were different between three hybrid cell types (A/B/C) and triple-positive cells. CONCLUSION The presence of hybrid cells indicated the marked intratumoral heterogeneity of steroidogenesis in APAs, particularly in those producing glucocorticoids and mineralocorticoids.
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Affiliation(s)
- Yasuhiro Nakamura
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan.
| | - Masaaki Kitada
- Department of Stem Cell Biology and Histology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Fumitoshi Satoh
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Nephrology, Endocrinology and Vascular Medicine, Department of Medicine, Tohoku University, Hospital, Sendai, Japan
| | - Takashi Maekawa
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ryo Morimoto
- Division of Nephrology, Endocrinology and Vascular Medicine, Department of Medicine, Tohoku University, Hospital, Sendai, Japan
| | - Yuto Yamazaki
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kazue Ise
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Celso E Gomez-Sanchez
- Endocrine Section, G.V. (Sonny) Montgomery VA Medical Center, MS, USA; Endocrinology, University of Mississippi Medical Center, MS, USA
| | - Sadayoshi Ito
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yoichi Arai
- Department of Urology, Tohoku University School of Medicine, Sendai, Japan
| | - Mari Dezawa
- Department of Stem Cell Biology and Histology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
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Liu S, Li F, Kong L, Sun Y, Qin L, Chen S, Cui H, Huang Y, Xia G. Genetic and epigenetic changes in somatic hybrid introgression lines between wheat and tall wheatgrass. Genetics 2015; 199:1035-45. [PMID: 25670745 PMCID: PMC4391570 DOI: 10.1534/genetics.114.174094] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Accepted: 02/05/2015] [Indexed: 12/27/2022] Open
Abstract
Broad phenotypic variations were induced in derivatives of an asymmetric somatic hybridization of bread wheat (Triticum aestivum) and tall wheatgrass (Thinopyrum ponticum Podp); however, how these variations occurred was unknown. We explored the nature of these variations by cytogenetic assays and DNA profiling techniques to characterize six genetically stable somatic introgression lines. Karyotyping results show the six lines similar to their wheat parent, but GISH analysis identified the presence of a number of short introgressed tall wheatgrass chromatin segments. DNA profiling revealed many genetic and epigenetic differences, including sequences deletions, altered regulation of gene expression, changed patterns of cytosine methylation, and the reactivation of retrotransposons. Phenotypic variations appear to result from altered repetitive sequences combined with the epigenetic regulation of gene expression and/or retrotransposon transposition. The extent of genetic and epigenetic variation due to the maintenance of parent wheat cells in tissue culture was assessed and shown to be considerably lower than had been induced in the introgression lines. Asymmetric somatic hybridization provides appropriate material to explore the nature of the genetic and epigenetic variations induced by genomic shock.
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Affiliation(s)
- Shuwei Liu
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Fei Li
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Lina Kong
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Yang Sun
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Lumin Qin
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Suiyun Chen
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Haifeng Cui
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
| | - Yinghua Huang
- U.S. Department of Agriculture/Agricultural Research Service Plant Science Research Laboratory, Stillwater, Oklahoma 74075
| | - Guangmin Xia
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan 250100, Peoples' Republic of China
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Abstract
mtDNA mutations are common in human cancers and are thought to contribute to the process of neoplasia. We examined the role of mtDNA mutations in skin cancer by generating fibroblast cybrids harboring a mutation in the gene encoding the mitochondrial tRNA for arginine. This somatic mutation (9821insA) was previously reported in UV-induced hyperkeratotic skin tumors in hairless mice and confers specific tumorigenic phenotypes to mutant cybrids. Microarray analysis revealed and RT-PCR along with Western blot analysis confirmed the up-regulation of CCL20 and its receptor CCR6 in mtBALB haplotype containing the mt-Tr 9821insA allele compared to wild type mtB6 haplotype. Based on reported role of CCL20 in cancer progression we examined whether the hyper-proliferation and enhanced motility of mtBALB haplotype would be associated with CCL20 levels. Treatment of both genotypes with recombinant CCL20 (rmCCL20) resulted in enhanced growth and motility of mtB6 cybrids. Furthermore, the acquired somatic alteration increased the in vivo tumor growth of mtBALB cybrids through the up-regulation of CCL20 since neutralizing antibody significantly decreased in vivo tumor growth of these cells; and tumors from anti-CCL20 treated mice injected with mtBALB cybrids showed significantly decreased CCL20 levels. When rmCCL20 or mtBALB cybrids were used as chemotactic stimuli, mtB6 cybrids showed increased motility while anti-CCL20 antibody decreased the migration and in vivo tumor growth of mtBALB cybrids. Moreover, the inhibitors of MAPK signaling and NF-κB activation inhibited CCL20 expression in mtBALB cybrids and decreased their migratory capabilities. Thus, acquired mtDNA mutations may promote tumorigenic phenotypes through up-regulation of chemokine CCL20.
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Affiliation(s)
- James Sligh
- Department of Medicine – Dermatology Division, University of Arizona, Tucson, AZ, 857 24, USA
- University of Arizona Cancer Center, Tucson, AZ, 85724, USA
| | - Jaroslav Janda
- University of Arizona Cancer Center, Tucson, AZ, 85724, USA
| | - Jana Jandova
- Department of Medicine – Dermatology Division, University of Arizona, Tucson, AZ, 857 24, USA
- University of Arizona Cancer Center, Tucson, AZ, 85724, USA
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Abstract
We present a microfluidic cell pairing device capable of sequential trapping and pairing of hundreds of cells using passive hydrodynamics and flow-induced deformation. We describe the design and operation principles of our device and show its applicability for cell fusion. Using our device, we achieved both homotypic and heterotypic cell pairing, demonstrating efficiencies up to 80%. The platform is compatible with fusion protocols based on biological, chemical and physical stimuli with fusion yields up to 95%. Our device further permits its disconnection from the fluidic hardware enabling its transportation for imaging and culture while maintaining cell registration on chip. Our design principles and cell trapping technique can readily be applied for different cell types and can be extended to trap and fuse multiple (>2) cell partners as demonstrated by our preliminary experiments.
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Affiliation(s)
- Burak Dura
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 36-824, Cambridge, MA 02139, USA.
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19
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Kenney MC, Chwa M, Atilano SR, Falatoonzadeh P, Ramirez C, Malik D, Tarek M, Del Carpio JC, Nesburn AB, Boyer DS, Kuppermann BD, Vawter MP, Jazwinski SM, Miceli MV, Wallace DC, Udar N. Molecular and bioenergetic differences between cells with African versus European inherited mitochondrial DNA haplogroups: implications for population susceptibility to diseases. Biochim Biophys Acta 2014; 1842:208-19. [PMID: 24200652 PMCID: PMC4326177 DOI: 10.1016/j.bbadis.2013.10.016] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 10/18/2013] [Accepted: 10/29/2013] [Indexed: 02/08/2023]
Abstract
The geographic origins of populations can be identified by their maternally inherited mitochondrial DNA (mtDNA) haplogroups. This study compared human cybrids (cytoplasmic hybrids), which are cell lines with identical nuclei but mitochondria from different individuals with mtDNA from either the H haplogroup or L haplogroup backgrounds. The most common European haplogroup is H while individuals of maternal African origin are of the L haplogroup. Despite lower mtDNA copy numbers, L cybrids had higher expression levels for nine mtDNA-encoded respiratory complex genes, decreased ATP (adenosine triphosphate) turnover rates and lower levels of reactive oxygen species production, parameters which are consistent with more efficient oxidative phosphorylation. Surprisingly, GeneChip arrays showed that the L and H cybrids had major differences in expression of genes of the canonical complement system (5 genes), dermatan/chondroitin sulfate biosynthesis (5 genes) and CCR3 (chemokine, CC motif, receptor 3) signaling (9 genes). Quantitative nuclear gene expression studies confirmed that L cybrids had (a) lower expression levels of complement pathway and innate immunity genes and (b) increased levels of inflammation-related signaling genes, which are critical in human diseases. Our data support the hypothesis that mtDNA haplogroups representing populations from different geographic origins may play a role in differential susceptibilities to diseases.
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Affiliation(s)
- M Cristina Kenney
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA; Department of Pathology and Laboratory Medicine, Univ. of California Irvine, Irvine, CA, USA.
| | - Marilyn Chwa
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
| | - Shari R Atilano
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
| | | | - Claudio Ramirez
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
| | - Deepika Malik
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
| | - Mohamed Tarek
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
| | | | - Anthony B Nesburn
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA; Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - David S Boyer
- Retina-Vitreous Associates Medical Group, Beverly Hills, CA, USA
| | | | - Marquis P Vawter
- Functional Genomics Laboratory, Department of Psychiatry and Human Behavior, Univ. of California Irvine, Irvine, CA, USA
| | | | - Michael V Miceli
- Tulane Center for Aging, Tulane University, New Orleans, LA, USA
| | | | - Nitin Udar
- Gavin Herbert Eye Institute, Univ. of California Irvine, Irvine, CA, USA
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20
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Silva DF, Selfridge JE, Lu J, E L, Roy N, Hutfles L, Burns JM, Michaelis EK, Yan S, Cardoso SM, Swerdlow RH. Bioenergetic flux, mitochondrial mass and mitochondrial morphology dynamics in AD and MCI cybrid cell lines. Hum Mol Genet 2013; 22:3931-46. [PMID: 23740939 DOI: 10.1093/hmg/ddt247] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Bioenergetic dysfunction occurs in Alzheimer's disease (AD) and mild cognitive impairment (MCI), a clinical syndrome that frequently precedes symptomatic AD. In this study, we modeled AD and MCI bioenergetic dysfunction by transferring mitochondria from MCI, AD and control subject platelets to mtDNA-depleted SH-SY5Y cells. Bioenergetic fluxes and bioenergetics-related infrastructures were characterized in the resulting cytoplasmic hybrid (cybrid) cell lines. Relative to control cybrids, AD and MCI cybrids showed changes in oxygen consumption, respiratory coupling and glucose utilization. AD and MCI cybrids had higher ADP/ATP and lower NAD+/NADH ratios. AD and MCI cybrids exhibited differences in proteins that monitor, respond to or regulate cell bioenergetic fluxes including HIF1α, PGC1α, SIRT1, AMPK, p38 MAPK and mTOR. Several endpoints suggested mitochondrial mass increased in the AD cybrid group and probably to a lesser extent in the MCI cybrid group, and that the mitochondrial fission-fusion balance shifted towards increased fission in the AD and MCI cybrids. As many of the changes we observed in AD and MCI cybrid models are also seen in AD subject brains, we conclude reduced bioenergetic function is present during very early AD, is not brain-limited and induces protean retrograde responses that likely have both adaptive and mal-adaptive consequences.
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Kenney MC, Chwa M, Atilano SR, Pavlis JM, Falatoonzadeh P, Ramirez C, Malik D, Hsu T, Woo G, Soe K, Nesburn AB, Boyer DS, Kuppermann BD, Jazwinski SM, Miceli MV, Wallace DC, Udar N. Mitochondrial DNA variants mediate energy production and expression levels for CFH, C3 and EFEMP1 genes: implications for age-related macular degeneration. PLoS One 2013; 8:e54339. [PMID: 23365660 PMCID: PMC3554762 DOI: 10.1371/journal.pone.0054339] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [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: 10/01/2012] [Accepted: 12/10/2012] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Mitochondrial dysfunction is associated with the development and progression of age-related macular degeneration (AMD). Recent studies using populations from the United States and Australia have demonstrated that AMD is associated with mitochondrial (mt) DNA haplogroups (as defined by combinations of mtDNA polymorphisms) that represent Northern European Caucasians. The aim of this study was to use the cytoplasmic hybrid (cybrid) model to investigate the molecular and biological functional consequences that occur when comparing the mtDNA H haplogroup (protective for AMD) versus J haplogroup (high risk for AMD). METHODOLOGY/PRINCIPAL FINDINGS Cybrids were created by introducing mitochondria from individuals with either H or J haplogroups into a human retinal epithelial cell line (ARPE-19) that was devoid of mitochondrial DNA (Rho0). In cybrid lines, all of the cells carry the same nuclear genes but vary in mtDNA content. The J cybrids had significantly lower levels of ATP and reactive oxygen/nitrogen species production, but increased lactate levels and rates of growth. Q-PCR analyses showed J cybrids had decreased expressions for CFH, C3, and EFEMP1 genes, high risk genes for AMD, and higher expression for MYO7A, a gene associated with retinal degeneration in Usher type IB syndrome. The H and J cybrids also have comparatively altered expression of nuclear genes involved in pathways for cell signaling, inflammation, and metabolism. CONCLUSION/SIGNIFICANCE Our findings demonstrate that mtDNA haplogroup variants mediate not only energy production and cell growth, but also cell signaling for major molecular pathways. These data support the hypothesis that mtDNA variants play important roles in numerous cellular functions and disease processes, including AMD.
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Affiliation(s)
- M Cristina Kenney
- Gavin Herbert Eye Institute, University of California Irvine, Irvine, California, United States of America.
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Bower K, Napier CE, Cole SL, Dagg RA, Lau LMS, Duncan EL, Moy EL, Reddel RR. Loss of wild-type ATRX expression in somatic cell hybrids segregates with activation of Alternative Lengthening of Telomeres. PLoS One 2012. [PMID: 23185534 PMCID: PMC3502299 DOI: 10.1371/journal.pone.0050062] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [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] [Indexed: 11/18/2022] Open
Abstract
Alternative Lengthening of Telomeres (ALT) is a non-telomerase mechanism of telomere lengthening that occurs in about 10% of cancers overall and is particularly common in astrocytic brain tumors and specific types of sarcomas. Somatic cell hybridization analyses have previously shown that normal telomerase-negative fibroblasts and telomerase-positive immortalized cell lines contain repressors of ALT activity, indicating that activation of ALT results from loss of one or more unidentified repressors. More recently, ATRX or DAXX was shown to be mutated both in tumors with telomere lengths suggestive of ALT activity and in ALT cell lines. Here, an ALT cell line was separately fused to each of four telomerase-positive cell lines, and four or five independent hybrid lines from each fusion were examined for expression of ATRX and DAXX and for telomere lengthening mechanism. The hybrid lines expressed either telomerase or ALT, with the other mechanism being repressed. DAXX was expressed normally in all parental cell lines and in all of the hybrids. ATRX was expressed normally in each of the four telomerase-positive parental cell lines and in every telomerase-positive hybrid line, and was abnormal in the ALT parental cells and in all but one of the ALT hybrids. This correlation between ALT activity and loss of ATRX expression is consistent with ATRX being a repressor of ALT.
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Affiliation(s)
- Kylie Bower
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
| | - Christine E. Napier
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
| | - Sara L. Cole
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
| | - Rebecca A. Dagg
- Children’s Cancer Research Unit, Children’s Hospital at Westmead, Westmead, New South Wales, Australia
| | - Loretta M. S. Lau
- Children’s Cancer Research Unit, Children’s Hospital at Westmead, Westmead, New South Wales, Australia
- Sydney Medical School, University of Sydney, New South Wales, Australia
| | - Emma L. Duncan
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
| | - Elsa L. Moy
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
| | - Roger R. Reddel
- Cancer Research Unit, Children’s Medical Research Institute, Westmead, New South Wales, Australia
- Sydney Medical School, University of Sydney, New South Wales, Australia
- * E-mail:
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Chen A, Raule N, Chomyn A, Attardi G. Decreased reactive oxygen species production in cells with mitochondrial haplogroups associated with longevity. PLoS One 2012; 7:e46473. [PMID: 23144696 PMCID: PMC3483264 DOI: 10.1371/journal.pone.0046473] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 08/31/2012] [Indexed: 01/04/2023] Open
Abstract
Mitochondrial DNA (mtDNA) is highly polymorphic, and its variations in humans may contribute to individual differences in function. Zhang and colleagues found a strikingly higher frequency of a C150T transition in the D-loop of mtDNA from centenarians and twins of an Italian population, and also demonstrated that this base substitution causes a remodeling of the mtDNA 151 replication origin in human leukocytes and fibroblasts [1]. The C150T transition is a polymorphism associated with several haplogroups. To determine whether haplogroups that carry the C150T transition display any phenotype that may be advantageous for longevity, we analyzed cybrids carrying or not the C150T transition. These cybrids were obtained by fusing cytoplasts derived from human fibroblasts with human mtDNA-less cells (ρ0 cells). We chose for cybrid construction and analysis haplogroup-matched pairs of fibroblast strains containing or not the C150T transition. In particular, we used, as one pair of mtDNA donors, a fibroblast strain of the U3a haplogroup, carrying the C150T transition and a strain of the U-K2 haplogroup, without the C150T transition, and as another pair, fibroblasts of the J2b haplogroup, carrying the C150T transition and of the J1c haplogroup, without the C150T transition. We have found no association of respiratory capacity, mtDNA level, mitochondrial gene expression level, or growth rate with the presence of the C150T transition. However, we have found that the cybrids with haplogroups that include the C150T transition have in common a lower reactive oxygen species (ROS) production rate than the haplogroup-matched cybrids without that transition. Thus, the lower ROS production rate may be a factor in the increased longevity associated with the U and the J2 haplogroups. Of further interest, we found that cybrids with the U3a haplogroup exhibited a higher respiration rate than the other cybrids examined.
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Affiliation(s)
- Ai Chen
- Division of Biology, California Institute of Technology, Pasadena, California, United States of America
- * E-mail: (A. Chen); (A. Chomyn)
| | | | - Anne Chomyn
- Division of Biology, California Institute of Technology, Pasadena, California, United States of America
- * E-mail: (A. Chen); (A. Chomyn)
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Hong K, Li Y, Duan W, Guo Y, Jiang H, Li W, Li C. Full-length TDP-43 and its C-terminal fragments activate mitophagy in NSC34 cell line. Neurosci Lett 2012; 530:144-9. [PMID: 23063673 DOI: 10.1016/j.neulet.2012.10.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 09/27/2012] [Accepted: 10/02/2012] [Indexed: 12/12/2022]
Abstract
TAR DNA binding protein of 43kDa (TDP-43), which has been associated with amyotrophic lateral sclerosis (ALS), plays an essential role in neurodegenerative disease pathogenesis. In particular, mitochondrial dysfunction is involved in the disease development. Thus, we investigated how TDP-43 is related to mitochondrial dysfunction. In this study, we found that overexpression of TDP-43 and its C-terminal fragments resulted in mitochondrial damage. In addition, full-length TDP-43 and truncated TDP-43 were localized in the mitochondria, where autophagy was activated, indicated by changes of LC3-II and p62. These studies suggest that human TDP-43 and its C-terminal fragments may cause mitochondrial dysfunction and enhance mitophagy.
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Affiliation(s)
- Kun Hong
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, China
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Imanishi H, Hattori K, Wada R, Ishikawa K, Fukuda S, Takenaga K, Nakada K, Hayashi JI. Mitochondrial DNA mutations regulate metastasis of human breast cancer cells. PLoS One 2011; 6:e23401. [PMID: 21853128 PMCID: PMC3154938 DOI: 10.1371/journal.pone.0023401] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Accepted: 07/15/2011] [Indexed: 02/03/2023] Open
Abstract
Mutations in mitochondrial DNA (mtDNA) might contribute to expression of the tumor phenotypes, such as metastatic potential, as well as to aging phenotypes and to clinical phenotypes of mitochondrial diseases by induction of mitochondrial respiration defects and the resultant overproduction of reactive oxygen species (ROS). To test whether mtDNA mutations mediate metastatic pathways in highly metastatic human tumor cells, we used human breast carcinoma MDA-MB-231 cells, which simultaneously expressed a highly metastatic potential, mitochondrial respiration defects, and ROS overproduction. Since mitochondrial respiratory function is controlled by both mtDNA and nuclear DNA, it is possible that nuclear DNA mutations contribute to the mitochondrial respiration defects and the highly metastatic potential found in MDA-MB-231 cells. To examine this possibility, we carried out mtDNA replacement of MDA-MB-231 cells by normal human mtDNA. For the complete mtDNA replacement, first we isolated mtDNA-less (ρ0) MDA-MB-231 cells, and then introduced normal human mtDNA into the ρ0 MDA-MB-231 cells, and isolated trans-mitochondrial cells (cybrids) carrying nuclear DNA from MDA-MB-231 cells and mtDNA from a normal subject. The normal mtDNA transfer simultaneously induced restoration of mitochondrial respiratory function and suppression of the highly metastatic potential expressed in MDA-MB-231 cells, but did not suppress ROS overproduction. These observations suggest that mitochondrial respiration defects observed in MDA-MB-231 cells are caused by mutations in mtDNA but not in nuclear DNA, and are responsible for expression of the high metastatic potential without using ROS-mediated pathways. Thus, human tumor cells possess an mtDNA-mediated metastatic pathway that is required for expression of the highly metastatic potential in the absence of ROS production.
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Affiliation(s)
- Hirotake Imanishi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Keisuke Hattori
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Reiko Wada
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Kaori Ishikawa
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Sayaka Fukuda
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Keizo Takenaga
- Shimane University Faculty of Medicine, Izumo, Shimane, Japan
| | - Kazuto Nakada
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Jun-Ichi Hayashi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- * E-mail:
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Wang J, Zhao C, Liu C, Xia G, Xiang F. Introgression of Swertia mussotii gene into Bupleurum scorzonerifolium via somatic hybridization. BMC Plant Biol 2011; 11:71. [PMID: 21513581 PMCID: PMC3098146 DOI: 10.1186/1471-2229-11-71] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 04/25/2011] [Indexed: 05/23/2023]
Abstract
BACKGROUND The wild herb Swertia mussotii is a source of the anti-hepatitis compounds swertiamarin, mangiferin and gentiopicroside. Its over-exploitation has raised the priority of producing these compounds heterologously. Somatic hybridization represents a novel approach for introgressing Swertia mussotii genes into a less endangered species. RESULTS Protoplasts derived from calli of Bupleurum scorzonerifolium and S. mussotii were fused to produce 194 putative hybrid cell lines, of which three (all derived from fusions where the S. mussotii protoplasts were pre-treated for 30 s with UV light) later differentiated into green plants. The hybridity of the calli was confirmed by a combination of isozyme, RAPD and chromosomal analysis. The hybrid calli genomes were predominantly B. scorzonerifolium. GISH analysis of mitotic chromosomes confirmed that the irradiation of donor protoplasts increased the frequency of chromosome elimination and fragmentation. RFLP analysis of organellar DNA revealed that mitochondrial and chloroplast DNA of both parents coexisted and recombined in some hybrid cell lines. Some of the hybrid calli contained SmG10H from donor, and produced swertiamarin, mangiferin and certain volatile compounds characteristic of S. mussotii. The expression of SmG10H (geraniol 10-hydroxylase) was associated with the heterologous accumulation of swertiamarin. CONCLUSIONS Somatic hybrids between B. scorzonerifolium and S. mussotii were obtained, hybrids selected all contained introgressed nuclear and cytoplasmic DNA from S. mussotii; and some produced more mangiferin than the donor itself. The introgression of SmG10H was necessary for the accumulation of swertiamarin.
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Affiliation(s)
- Junfeng Wang
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Shanda Nanlu 27#, Jinan 250100, China
- Crop Germplasm Resources Centre of Shandong, Shandong Academy of Agricultural Sciences, Gongye Beilu 202#, Jinan 250100, China
| | - Cuizhu Zhao
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Shanda Nanlu 27#, Jinan 250100, China
| | - Chang Liu
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Shanda Nanlu 27#, Jinan 250100, China
| | - Guangmin Xia
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Shanda Nanlu 27#, Jinan 250100, China
| | - Fengning Xiang
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Shanda Nanlu 27#, Jinan 250100, China
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Abstract
Tumor necrosis factor-alpha (TNF-α) may cause apoptosis and inflammation in amyotrophic lateral sclerosis (ALS) and spinal cord injury (SCI). Recent studies suggest that estrogen (EST) provides neuroprotection against SCI. We tested whether 1,3,5-tris (4-hydroxyphenyl)-4-propyl-1H-pyrazole (PPT) (EST receptor alpha (ERα) agonist), 2,3-bis (4-hydroxyphenyl) propionitrile (DPN) (EST receptor beta (ERβ) agonist), or EST itself would prevent apoptosis in VSC4.1 motoneurons following exposure to TNF-α. Cells were exposed to TNF-α and 15 min later treated with PPT, DPN, or EST. Posttreatment with 50 nM PPT, 50 nM DPN, or 150 nM EST prevented cell death in VSC4.1 motoneurons. Treatment of VSC4.1 motoneurons with PPT, DPN, or EST induced overexpression of ERα, ERβ, or both, which contributed to neuroprotection by upregulating expression of anti-apoptotic proteins (p-AKT, p-CREB, Bcl-2, and p-Src). Our analyses also revealed that EST agonists and EST increased phosphorylation of extracellular signal-regulated kinase (ERK). The L-type Ca(2+) channel inhibitor, nifedipine (10 μM), partially inhibited EST agonist and EST-induced increase in phosphorylated ERK expression. The mitogen-activated protein kinase inhibitor, PD98059 (5 μM), partially prevented ER agonists and EST from providing neuroprotection to TNF-α toxicity. Presence of the nuclear ER antagonist, ICI 182 780 (10 μM), blocked the neuroprotection provided by all three ER agonists tested. Taken together, our data indicate that both ERα and ERβ contribute to PPT, DPN, or EST-mediated neuroprotection with similar signaling profiles. Our data strongly imply that PPT, DPN, or EST can be used as effective neuroprotective agents to attenuate motoneuron death in ALS and SCI.
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Affiliation(s)
- Arabinda Das
- Department of Neurosciences, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, South Carolina 29425, USA
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Abstract
Recent technological advances have enabled visualization of the organization and dynamics of local -chromatin structures; however, the global mechanisms by which chromatin organization modulates gene regulation are poorly understood. We designed and constructed a human artificial chromosome (HAC) vector that allows regulation of transgene expression and delivery of a gene expression platform into many vertebrate cell lines. This technology for manipulating a transgene using a HAC vector could be used in applied biology.
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Ivanovna SE, Alekseevich LO, Mikhailovich KY, Vladimirovna ZO. Genetic stability of murine pluripotent and somatic hybrid cells may be affected by conditions of their cultivation. J Stem Cells 2011; 6:199-212. [PMID: 23550338] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Using mouse pluripotent teratocarcinoma PCC4azal cells and proliferating spleen lymphocytes we obtained a new type of hybrids, in which marker lymphocyte genes were suppressed, but expression the Oct-4 gene was not effected; the hybrid cells were able to differentiate to cardiomyocytes. In order to specify the environmental factors which may affect the genetic stability and other hybrid properties, we analyzed the total chromosome number and differentiation potencies of hybrids respectively to conditions of their cultivation. Particular attention was paid to the number and transcription activity of chromosomal nucleolus organizing regions (NORs), which harbor the most actively transcribed - ribosomal - genes. The results showed that the hybrids obtained are characterized by a relatively stable chromosome number which diminished less than in 5% during 27 passages. However, a long-term cultivation of hybrid cells in non-selective conditions resulted in preferential elimination of some NO- chromosomes, whereas the number of active NORs per cell was increased due to activation of latent NORs. On the contrary, in selective conditions, i.e. in the presence of hypoxantine, aminopterin and thymidine, the total number of NOR-bearing chromosomes was not changed, but a partial inactivation of remaining NORs was observed. The higher number of active NORs directly correlated with the capability of hybrid cells for differentiation to cardiomyocytes.
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Affiliation(s)
- Shramova Elena Ivanovna
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow
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30
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Bulla GA, Luong Q, Shrestha S, Reeb S, Hickman S. Genome-wide analysis of hepatic gene silencing in mammalian cell hybrids. Genomics 2010; 96:323-32. [PMID: 20801210 DOI: 10.1016/j.ygeno.2010.08.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 08/13/2010] [Accepted: 08/17/2010] [Indexed: 12/29/2022]
Abstract
Silencing of tissue-specific gene expression in mammalian somatic cell hybrids is a well-documented epigenetic phenomenon which is both profound (involving a large number of genes) and enigmatic. Our aim was to utilize whole-genome microarray analyses to determine the true extent of gene silencing on a genomic level. By comparing gene expression profiles of hepatoma×fibroblast cell hybrids with those of parental cells, we have identified over 300 liver-enriched genes that are repressed at least 5-fold in the cell hybrids, the majority of which are repressed at least 10-fold. Also, we identify nearly 200 fibroblast-enriched genes that are repressed at least 5-fold. Silenced hepatic genes include several that encode transcription factors and proteins involved in signal transduction pathways. These data suggest that extensive reprogramming occurs in cell hybrids, leading to a nearly global (although not complete) loss of tissue-specific gene expression.
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Affiliation(s)
- Gary A Bulla
- Department of Biological Sciences, Eastern Illinois University, 600 Lincoln Avenue, Charleston, IL 61920, USA.
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Yang CY, Li RC, Pang CY, Yang BZ, Qin GS, Chen MT, Zhang XF, Huang FX, Zheng HY, Huang YJ, Liang XW. Study on the inter-subspecies nuclear transfer of river buffalo somatic cell nuclei into swamp buffalo oocyte cytoplasm. Anim Reprod Sci 2010; 121:78-83. [PMID: 20621244 DOI: 10.1016/j.anireprosci.2010.05.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [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: 06/13/2009] [Revised: 04/23/2010] [Accepted: 05/12/2010] [Indexed: 11/16/2022]
Abstract
The objective of this study was to explore the feasibility of inter-subspecies somatic cell nuclear transfer (SCNT) of river buffalo (50 chromosomes) somatic cell nuclei into swamp buffalo (48 chromosomes) oocyte cytoplasm. The enucleated swamp buffalo oocytes were fused with four different types of river buffalo cells: freshly thawed ear fibroblasts, serum-starved ear fibroblasts, cumulus cells and ear fibroblasts from a cloned buffalo calf. As a result, the developmental competence of embryos reconstructed with freshly thawed ear fibroblasts was the poorest (P<0.01), while those of the other three types were not different from each other. Furthermore, the efficiency of swamp-swamp buffalo, swamp-river buffalo and bovine-buffalo SCNT were also compared. The results showed that the blastocyst rate of swamp-river reconstructed embryos was not different from swamp-swamp embryos, while significantly higher than that of bovine-buffalo embryos (P<0.01). A total of thirty cloned blastocysts derived from freshly thawed ear fibroblasts were transferred into thirteen recipient buffaloes, four recipients established pregnancy, while three of them aborted on Days 65, 75 and 90 of gestation, respectively. One cross-bred buffalo (Murrah x swamp, 49 chromosomes) receiving three embryos delivered a 39 kg female calf on Day 335 of gestation. These results indicate that the inter-subspecies SCNT is feasible to produce swamp-river buffalo embryos, and these can develop to full term and result in live buffalo calves.
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Affiliation(s)
- C Y Yang
- Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, 24-1 Yongwu Road, Nanning, Guangxi, PR China
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Yano T, Tanaka M, Fukuda N, Ueda T, Nagase H. Loss of mutant mitochondrial DNA harboring the MELAS A3243G mutation in human cybrid cells after cell-cell fusion with normal tissue-derived fibroblast cells. Int J Mol Med 2010; 25:153-158. [PMID: 19956914] [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: 05/28/2023] Open
Abstract
Mutant mitochondrial (mt) DNA variants are related to human disease and have been investigated using cytoplasmic hybrid (cybrid) cells generated from human tumor cells in which mutant mt maintenance depends on the cell line. It is, however, unclear whether human intercellular fusion of non-tumorous cells influences the maintenance of disease-related mutant mt. A preliminary experiment of cell-cell fusion between a human skin fibroblast cell line from a Lesch-Nyhan syndrome patient and an osteosarcoma cybrid cell line harboring the mitochondrial tRNALeu(UUR)A3243G mutation showed a decrease of A3243G mutant mtDNA in fused cells during passages. In order to confirm the decrease of mutant mtDNA, we performed cell-cell fusion experiments using another human lung fibroblastic cell line. When the hygromycin-resistant osteosarcoma cybrid cell line was fused with the fibroblasts without any A3243G mtDNA mutations, the proportion of A3243G mutant mtDNA in the hybrid cells gradually decreased during cell culture and almost completely disappeared in all hybrid clones at the end of 15 passages. These results indicated that A3243G mutant specific mtDNA decreases in the hybrid background when normal fibroblast-derived cell contents, including the nucleus and mt, were introduced. Thus, we are hypothesizing that the non-tumorigenic fibroblast cellular components induce a difference in replication efficacy between the mtDNAs with and without the A3243G mutant sequence, which may be related to the decrease of disease-related mutant mtDNA in the hybrid cells.
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Affiliation(s)
- Takamitsu Yano
- Department of Medical Genome Sciences, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan
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Yamanaka N, Wong CJ, Gertsenstein M, Casper RF, Nagy A, Rogers IM. Bone marrow transplantation results in human donor blood cells acquiring and displaying mouse recipient class I MHC and CD45 antigens on their surface. PLoS One 2009; 4:e8489. [PMID: 20046883 PMCID: PMC2796175 DOI: 10.1371/journal.pone.0008489] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [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: 07/22/2009] [Accepted: 11/09/2009] [Indexed: 11/19/2022] Open
Abstract
Background Mouse models of human disease are invaluable for determining the differentiation ability and functional capacity of stem cells. The best example is bone marrow transplants for studies of hematopoietic stem cells. For organ studies, the interpretation of the data can be difficult as transdifferentiation, cell fusion or surface antigen transfer (trogocytosis) can be misinterpreted as differentiation. These events have not been investigated in hematopoietic stem cell transplant models. Methodology/Principal Findings In this study we investigated fusion and trogocytosis involving blood cells during bone marrow transplantation using a xenograft model. We report that using a standard SCID repopulating assay almost 100% of the human donor cells appear as hybrid blood cells containing both mouse and human surface antigens. Conclusion/Significance Hybrid cells are not the result of cell-cell fusion events but appear to be due to efficient surface antigen transfer, a process referred to as trogocytosis. Antigen transfer appears to be non-random and includes all donor cells regardless of sub-type. We also demonstrate that irradiation preconditioning enhances the frequency of hybrid cells and that trogocytosis is evident in non-blood cells in chimera mice.
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Affiliation(s)
- Nobuko Yamanaka
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Christine J. Wong
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Marina Gertsenstein
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Robert F. Casper
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Canada
| | - Andras Nagy
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Ian M. Rogers
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Canada
- * E-mail:
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Adams GG, Uddin A, Vives-Pi M, Pujol-Borrell R, James RFL. Characterisation of the NES2Y cell line and its use in the production of human glucose-responsive insulin producing (hGRIP) cell lines by cell-cell fusion. Islets 2009; 1:117-23. [PMID: 21099259 DOI: 10.4161/isl.1.2.9432] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Diabetes mellitus is a debilitating disease and alternative methods of treatment are a priority if the short-term and long term sequelae are to be avoided. Here the authors manipulate NES2Y cells, which have the potential to be used as 'fusion partners' to produce human insulin-producing glucose-responsive hybrids. The fusion experiments were carried out using polyethylene glycol (PEG) and electroporation. Human insulin production of the resulting hybrids (in response to glucose) was measured using ELISA. Our results showed that it is possible to engineer human glucose-responsive insulin-producing (hGRIPs) hybrid cells by the manipulation of two different cell types. The resulting hybrids continuously grow in culture and are insulin-secreting and glucose-responsive for a period of time. Immortalised cells with the characteristics of human beta cells could provide an important resource for experimental studies in Type 1 diabetes, such as an improved understanding of the fundamental mechanisms of glucose-responsive insulin processing and secretion, transplantation and drug screening programs.
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Affiliation(s)
- Gary G Adams
- Insulin Diabetes Experimental Research Group, Faculty of Medicine and Health Science, University of Nottingham, Clifton Boulevard, Nottingham, UK.
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Abstract
Parkinson's disease (PD) is the eponym attached to the most prevalent neurodegenerative movement disorder of adults, derived from observations of an early nineteenth century physician and paleontologist, James Parkinson, and is now recognized to encompass much more than a movement disorder clinically or dopamine neuron death pathologically. Most PD ( approximately 90%) is sporadic (sPD), is associated with mitochondrial deficiencies and has been studied in cell and animal models arising from the use of mitochondrial toxins that unfortunately have not predicted clinical efficacy to slow disease progression in humans. We have extensively studied the cytoplasmic hybrid ("cybrid") model of sPD in which donor mtDNAs are introduced into and expressed in neural tumor cells with identical nuclear genetic and environmental backgrounds. sPD cybrids demonstrate many abnormalities in which increased oxidative stress drives downstream antioxidant response and cell death activating signaling pathways. sPD cybrids regulate mitochondrial ETC genes and gene ontology families like sPD brain. sPD cybrids spontaneously form Lewy bodies and Lewy neurites, linking mtDNA expression to neuropathology, and demonstrate impaired organelle transport in processes and reduced mitochondrial respiration. Our recent studies show that near-infrared laser light therapy normalizes mitochondrial movement and can stimulate respiration in sPD cybrid neurons, and mitochondrial gene therapy can restore respiration and stimulate mitochondrial ETC gene and protein expression. sPD cybrids have provided multiple lines of circumstantial evidence linking mtDNA to sPD pathogenesis and can serve as platforms for therapy development. sPD cybrid models can be improved by the use of non-tumor human stem cell-derived neural precursor cells and by an introduction of postmortem brain mtDNA to test its causality directly.
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Affiliation(s)
- Patricia A Trimmer
- Morris K. Udall Parkinson's Disease Research Center of Excellence, Department of Neurology, University of Virginia, Charlottesville, 22908, USA.
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Pereira CF, Terranova R, Ryan NK, Santos J, Morris KJ, Cui W, Merkenschlager M, Fisher AG. Heterokaryon-based reprogramming of human B lymphocytes for pluripotency requires Oct4 but not Sox2. PLoS Genet 2008; 4:e1000170. [PMID: 18773085 PMCID: PMC2527997 DOI: 10.1371/journal.pgen.1000170] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Accepted: 07/15/2008] [Indexed: 12/14/2022] Open
Abstract
Differentiated cells can be reprogrammed through the formation of heterokaryons and hybrid cells when fused with embryonic stem (ES) cells. Here, we provide evidence that conversion of human B-lymphocytes towards a multipotent state is initiated much more rapidly than previously thought, occurring in transient heterokaryons before nuclear fusion and cell division. Interestingly, reprogramming of human lymphocytes by mouse ES cells elicits the expression of a human ES-specific gene profile, in which markers of human ES cells are expressed (hSSEA4, hFGF receptors and ligands), but markers that are specific to mouse ES cells are not (e.g., Bmp4 and LIF receptor). Using genetically engineered mouse ES cells, we demonstrate that successful reprogramming of human lymphocytes is independent of Sox2, a factor thought to be required for induced pluripotent stem (iPS) cells. In contrast, there is a distinct requirement for Oct4 in the establishment but not the maintenance of the reprogrammed state. Experimental heterokaryons, therefore, offer a powerful approach to trace the contribution of individual factors to the reprogramming of human somatic cells towards a multipotent state. One of the most pressing objectives of medical research today is the development of approaches to restore the function of tissues damaged by accident or disease. An important goal for this work is the isolation of stem cell populations to replace missing or nonfunctioning cells. Because problems of immune rejection are likely to occur unless the recipient and donor stem cells are very closely matched, a desirable strategy is to convert differentiated cells (such as white blood cells) from patients into immature tailored stem cell populations. Here, we have experimentally fused human white blood cells and mouse embryonic stem cells and shown that this reprograms them to become stem-like. This kind of “differentiation reversal” is shown to be rapid and stable. It requires the stem cell–specific factor Oct4, but does not require Sox2. This approach allows the identification of factors that are required to reprogram human blood cells with the long-term perspective to eventually generate patient-specific stem cells.
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Affiliation(s)
- Carlos F. Pereira
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Rémi Terranova
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Natalie K. Ryan
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Joana Santos
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Kelly J. Morris
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Wei Cui
- Stem Cell Initiative, Institute of Reproductive and Developmental Biology, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London, United Kingdom
| | - Matthias Merkenschlager
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
| | - Amanda G. Fisher
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
- * E-mail:
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Shimmin LC, Natarajan S, Ibarguen H, Montasser M, Kim DK, Hanis CL, Boerwinkle E, Wadhwa PD, Hixson JE. Corticotropin releasing hormone (CRH) gene variation: comprehensive resequencing for variant and molecular haplotype discovery in monosomic hybrid cell lines. ACTA ACUST UNITED AC 2008; 18:434-44. [PMID: 17676473 DOI: 10.1080/10425170701388719] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Candidate gene association studies have met with mixed success due to many reasons including incomplete surveys of genetic variation and differences in patterns of genetic variation among study populations. We present the results of comprehensive variant discovery for the corticotropin releasing hormone gene (CRH on chromosome 8) encoding a neuropeptide that is central to many physiologic pathways. Mouse-human hybrid cell lines were constructed that are monosomic for human chromosome 8 for resequencing of separated CRH alleles to identify variants and directly determine their chromosomal phase for three major ethnic groups including African Americans (AA), Mexican Americans (MA) and European Americans (EA). We also resequenced diploid individuals to evaluate single nucleotide polymorphism (SNP) discovery in the limited numbers of monosomic hybrid cell lines. Our results show that CRH variation is very different in AA, yielding larger numbers of variants and haplotypes compared to MA and EA. Analysis of LD structure found three haplotype blocks in AA and two blocks in EA. Comparisons between AA and EA groups yielded extremely high measures of genetic differentiation (Wright's F(ST)>0.6), likely reflecting disruptive selection in CRH evolution. Network analysis showed that AA have retained an ancestral CRH haplotype, while the most common EA haplotype is derived from a single recombination event.
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Affiliation(s)
- Lawrence C Shimmin
- Human Genetics Center, University of Texas Health Science Center at Houston, Houston, TX, USA
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Oza J, Yang J, Chen KY, Liu AYC. Changes in the regulation of heat shock gene expression in neuronal cell differentiation. Cell Stress Chaperones 2008; 13:73-84. [PMID: 18347944 PMCID: PMC2666217 DOI: 10.1007/s12192-008-0013-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 08/01/2007] [Accepted: 08/09/2007] [Indexed: 11/28/2022] Open
Abstract
Neuronal differentiation of the NG108-15 neuroblastoma-glioma hybrid cells is accompanied by a marked attenuation in the heat shock induction of the Hsp70-firefly luciferase reporter gene activity. Analysis of the amount and activation of heat shock factor 1, induction of mRNA(hsp), and the synthesis and accumulation of heat shock proteins (HSPs) in the undifferentiated and differentiated cells suggest a transcriptional mechanism for this attenuation. Concomitant with a decreased induction of the 72-kDa Hsp70 protein in the differentiated cells, there is an increased abundance of the constitutive 73-kDa Hsc70, a protein known to function in vesicle trafficking. Assessment of sensitivity of the undifferentiated and differentiated cells against stress-induced cell death reveals a significantly greater vulnerability of the differentiated cells toward the cytotoxic effects of arsenite and glutamate/glycine. This study shows that changes in regulation of the HSP and HSC proteins are components of the neuronal cell differentiation program and that the attenuated induction of HSPs likely contributes to neuronal vulnerability whereas the increased expression of Hsc70 likely has a role in neural-specific functions.
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Affiliation(s)
- Jay Oza
- Department of Cell Biology and Neuroscience, Division of Life Sciences, Rutgers State University of New Jersey, 604 Allison Road, Piscataway, NJ 08854-8082 USA
| | - Jingxian Yang
- Department of Cell Biology and Neuroscience, Division of Life Sciences, Rutgers State University of New Jersey, 604 Allison Road, Piscataway, NJ 08854-8082 USA
| | - Kuang Yu Chen
- Department of Chemistry and Chemical Biology, Rutgers State University of New Jersey, Piscataway, NJ USA
| | - Alice Y.-C. Liu
- Department of Cell Biology and Neuroscience, Division of Life Sciences, Rutgers State University of New Jersey, 604 Allison Road, Piscataway, NJ 08854-8082 USA
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Menzorov AG, Matveeva NM, Larkin DM, Zaykin DV, Serov OL. [Fate of parental mitochondria in embryonic stem hybrid cells]. Tsitologiia 2008; 50:711-718. [PMID: 18822791 PMCID: PMC2775045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
When hybrid cells are created, not only the nuclear genomes of parental cells unite but their cytoplasm as well. Mitochondrial DNA (mtDNA) is a convenient marker of cytoplasm allowing one to gain insight into the organization of hybrid cell cytoplasm. We analyzed the parental mtDNAs in hybrid cells resulting from fusion of Mus musculus embryonic stem (ES) cells with splenocytes and fetal fibroblasts of DD/c mice or with splenocytes of M. caroli. Identification of the parental mtDNAs in hybrid cells was based on polymorphism among the parental mtDNAs for certain restrictases. We found that intra- and inter-specific ES cell-splenocyte hybrid cells lost entirely or partially mtDNA derived from the somatic partner, whereas ES cell-fibroblast hybrids retained mtDNAs from both parents in similar ratios with a slight bias. The lost of the “somatic” mitochondria by ES-splenocyte hybrids implies non-random segregation of the parental mitochondria as supported by a computer simulation of genetic drift. In contrast, ES cell-fibroblast hybrids show bilateral random segregation of the parental mitochondria judging from analysis of mtDNA in single cells. Preferential segregation of “somatic” mitochondria does not depend on the differences in sequences of the parental mtDNAs but depends on replicative state of the parental cells.
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Han DW, Do JT, Gentile L, Stehling M, Lee HT, Schöler HR. Pluripotential reprogramming of the somatic genome in hybrid cells occurs with the first cell cycle. Stem Cells 2007; 26:445-54. [PMID: 18065396 DOI: 10.1634/stemcells.2007-0553] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The fusion of pluripotent embryonic cells with somatic cells results in reprogramming of the somatic cell genome. Oct4-green fluorescent protein (GFP) transgenes that do not contain the proximal enhancer (PE) region are widely used to visualize reprogramming of the somatic to the pluripotent cell state. The temporal onset of Oct4-GFP activation has been found to occur 40-48 hours postfusion. We asked whether activation of the transgene actually reflects activation of the endogenous Oct4 gene. In the current study, we show that activation of an Oct4-GFP transgene that contains the PE region occurs within 22 hours of fusion. In addition, demethylation of the Oct4-GFP transgene and that of the endogenous Oct4 and Nanog genes was found to occur within 24 hours of fusion. As this timing corresponds with the timing of cell cycle completion in embryonic stem cells and fusion hybrids (approximately 22 hours), we postulate that pluripotential reprogramming of the somatic cell genome begins during the first cell cycle after the fusion of a somatic cell with a pluripotent cell and has been completed by day 2 postfusion.
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Affiliation(s)
- Dong Wook Han
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Röntgenstrasse 20, 48149 Münster, Germany
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Paulis M, Bensi M, Orioli D, Mondello C, Mazzini G, D'Incalci M, Falcioni C, Radaelli E, Erba E, Raimondi E, De Carli L. Transfer of a Human Chromosomal Vector from a Hamster Cell Line to a Mouse Embryonic Stem Cell Line. Stem Cells 2007; 25:2543-50. [PMID: 17615268 DOI: 10.1634/stemcells.2007-0052] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Two transchromosomic mouse embryonic stem (ES) sublines (ESMClox1.5 and ESMClox2.1) containing a human minichromosome (MC) were established from a sample of hybrid colonies isolated in fusion experiments between a normal diploid mouse ES line and a Chinese hamster ovary line carrying the MC. DNA cytometric and chromosome analyses of ESMClox1.5 and ESMClox2.1 indicated a mouse chromosome complement with a heteroploid constitution in a subtetraploid range; the karyotypes showed various degrees of polysomy for different chromosomes. A single copy of the MC was found in the majority of cells in all the isolated hybrid colonies and was stably maintained in the established sublines for more than 100 cell generations either with or without the selective agent. No significant differences from the ES parental cells were observed in growth characteristics of the transchromosomic ES sublines. ESMClox1.5 cells were unable to grow in soft agar; when cultured in hanging drops, they formed embryoid bodies, and when inoculated in nude mice, they produced teratomas. They were able to express the early development markers Oct4 and Nanog, as demonstrated by reverse transcription-polymerase chain reaction assay. All these features are in common with the ES parental line. Further research using the transchromosomic ES sublines described here may allow gene expression studies on transferred human minichromosomes and could shed light on the relationships among ploidy, pluripotency, cell transformation, and tumorigenesis. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Marianna Paulis
- Dipartimento di Genetica e Microbiologia Adriano Buzzati Traverso Università degli Studi di Pavia, Pavia, Italy
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Masuda Y, Yamada T, Kuboyama T, Marubashi W. Identification and characterization of genes involved in hybrid lethality in hybrid tobacco cells (Nicotiana suaveolens x N. tabacum) using suppression subtractive hybridization. Plant Cell Rep 2007; 26:1595-604. [PMID: 17410367 DOI: 10.1007/s00299-007-0352-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2006] [Revised: 03/14/2007] [Accepted: 03/18/2007] [Indexed: 05/14/2023]
Abstract
Hybrid lethality is an important problem for cross-breeding; however, its molecular mechanism is not clear. The purpose of the present study was to identify the genes expressed during hybrid lethality in the hybrid cells (Nicotiana suaveolens x N. tabacum). In order to identify these genes, we employed suppression subtractive hybridization (SSH) between RNA isolated from cells expressing lethality (lethal hybrid line; LH line) and cells overcoming lethality fortuitously (a surviving hybrid line; SH line). Four populations of cDNA were created from the time points corresponding to before and during induction, and at and after the point of no return (PNR) during the process of programmed cell death (PCD) that occurs during hybrid lethality. By SSH and following dot-blot macroarray analysis, 99 genes out of 138 isolated clones were identified as hybrid lethality-related (HLR) genes. Quantitative real-time PCR analysis data indicated that ten clones were expressed specifically in LH line cells. The HLR genes in these clones show homology to genes involved in disease resistance, ethylene-induced reactions, phosphorylation, ubiquitination, jasmonic acid-related reactions, calcium signaling and self-incompatibility. These data suggested that at least some parts of the mechanism of hybrid lethality are shared with those of the putative functions of the HLR gene-related pathways.
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Affiliation(s)
- Yu Masuda
- Laboratory of Plant Chromosome and Gene Stock, Graduate School of Science, Hiroshima University, 1-4-3 Kagamiyama, Higashi-Hiroshima-city, Hiroshima 739-8526, Japan
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Zhou J, Xia JC, Wang H, Wang QJ, Huang LX, Li YQ, Chen SP, Zhou FJ. [Antitumor response induced by vaccine of autologous dendritic/tumor fusion cells against renal cell]. Zhonghua Zhong Liu Za Zhi 2007; 29:411-414. [PMID: 17974271] [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] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
OBJECTIVE To investigate whether dendritic cells fused with tumor cells could elicit in vitro antitumor responses against renal cell carcinoma (RCC) cells. METHODS Renal carcinoma cells were purified from tumor tissue excised from patients with metastatic RCC through tumor cell purifying technique and cultured in RPMI-1640 medium containing 10% FCS. Monocyte-derived DCs generated from peripheral blood mononuclear cell of RCC patients were cultured in the presence of human recombinant granulocyte-macrophage colony stimulating factor and interleukin-4. Tumor cells and DCs were cocultured in the presence of polyethylene glycol (PEG) to generate cell fusion. The phenotype of tumor cells, DCs and fusion cells were detected by flow cytometry. MTT was used to measure the ability of fusion cells to stimulate T cell proliferation. T cell-mediated antitumor responses were measured by lactate dehydrogenase release (LDH) assay for lysis of autologous tumor cells. RESULTS The DCs expressed MHC class I, MHC class II and costimulatary molecules (CD80 and CD86), while the renal carcinoma cells expressed a high molecular glycoprotein MUC-1. The DC/tumor fusion cells coexpressed MUC-1 and the phenotype of DCs, and could stimulate T cell proliferation effectively. CTLs stimulated by the fusion vaccine showed distinct lytie activity in vitro to autologous tumor cells. CONCLUSION Dendritic cells fused with tumor cells can elicit distinct antitumor responses in vitro against tumor cells from patients with metastatic RCC, providing a basis for further research on the clinical application of fusion vaccine in treatment for renal cancers.
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Affiliation(s)
- Jun Zhou
- State Key Laboratory of Oncology in Southern China, Cancer Center, Sun Yat-sen University, Guangzhou 510060, China
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Munakata K, Fujii K, Nanko S, Kunugi H, Kato T. Sequence and functional analyses of mtDNA in a maternally inherited family with bipolar disorder and depression. Mutat Res 2007; 617:119-24. [PMID: 17320116 DOI: 10.1016/j.mrfmmm.2007.01.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 05/26/2006] [Revised: 01/04/2007] [Accepted: 01/17/2007] [Indexed: 10/23/2022]
Abstract
Recent studies suggest that mutations/polymorphisms of mitochondrial DNA (mtDNA) are associated with neuropsychiatric diseases. We identified a patient with major depression and epilepsy. Some family members in the pedigree of the proband had bipolar disorder, depression, suicide, or psychotic disorder not otherwise specified. The mode of inheritance was compatible with maternal inheritance with low penetration. We assumed that the mental disorder in this family might be associated with maternally inherited mitochondrial DNA (mtDNA) mutation. We sequenced the entire mtDNA of the proband. Among the 34 base substitutions detected in the proband, two homoplasmic, nonsynonymous single substitutions of mtDNA, T3394C in MT-ND1 and A9115G in MT-ATP6, were suspected to cause functional impairment, because the former was reported to be disease-related and the latter is vary rare. To study the functional outcome of these substitutions, we examined mitochondrial membrane potential and the activity of mitochondrial ATP synthesis in the transmitochondrial cybrids, but no significant impairment was detected. The data did not support our hypothesis that these disorders in this family are caused by mtDNA mutation(s).
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Affiliation(s)
- Kae Munakata
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Brain Science Institute, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
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Chen J, Zhao X, Lai Y, Suzuki A, Tomaru U, Ishizu A, Takada A, Ikeda H, Kasahara M, Yoshiki T. Enhanced production of p24 Gag protein in HIV-1-infected rat cells fused with uninfected human cells. Exp Mol Pathol 2007; 83:125-30. [PMID: 17222823 DOI: 10.1016/j.yexmp.2006.11.003] [Citation(s) in RCA: 2] [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] [Received: 08/16/2006] [Revised: 10/25/2006] [Accepted: 11/20/2006] [Indexed: 11/29/2022]
Abstract
Although many human molecules have been suggested to affect replication of human immunodeficiency virus type 1 (HIV-1), the distribution of such cofactors in human cell types is not well understood. Rat W31/D4R4 fibroblasts expressing human CD4 and CXCR4 receptors were infected with HIV-1. The provirus was integrated in the host genome, but only a limited amount of p24 Gag protein was produced in the cells and culture supernatants. Here we found that p24 production was significantly increased by fusing HIV-1-infected W31/D4R4 cells with uninfected human cell lines of T-cell, B-cell, or macrophage lineages. These findings suggest that human cellular factors supporting HIV-1 replication are distributed widely in cells of lymphocyte and macrophage lineages. We also examined whether the amount of p24 produced by rat-human hybrid cells was correlated with expression levels of specific human genes. The results suggested that HP68 and MHC class II transactivator (CIITA) might up- and down-regulate p24 production, respectively. It was also suggested that HIV-1 replication is affected by molecules other than those examined in this study, namely, cyclin T1, cyclin-dependent kinase 9, CRM1, HP68, and CIITA.
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Affiliation(s)
- Jing Chen
- Department of Pathology, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan
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Olszanecki R, Gebska A, Korbut R. Production of prostacyclin and prostaglandin E2 in resting and IL-1beta-stimulated A549, HUVEC and hybrid EA.HY 926 cells. J Physiol Pharmacol 2006; 57:649-60. [PMID: 17229988] [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] [Subscribe] [Scholar Register] [Received: 10/26/2006] [Accepted: 10/30/2006] [Indexed: 05/13/2023]
Abstract
Production of arachidonic acid (AA) metabolites - prostacyclin (PGI(2)) in large vessels and prostaglandin E(2) (PGE(2)) in microcirculation is intrinsically involved in maintenance of vascular wall homeostasis. EA.hy 926 is a hybrid cell line, is derived by fusion of HUVEC with A549 cells. The aim of this study was to examine the production of prostacyclin and PGE2 in resting and IL-1beta-stimulated EA.ha 926 cells, in comparison with its progenitor cells. Non-stimulated EA.hy 926 cells has been found to produce much lower amounts of prostacyclin than resting HUVEC. Resting hybrid cells produced more PGE(2) than prostacyclin, despite they expressed high levels of COX-1 and PGI(2) synthase. On the contrary to HUVEC and A549, EA.hy 926 cells did not respond to IL-1beta with COX-2 induction and increase of prostaglandin production, however they did it in response to lysophosphatidylcholine (LPC). The characteristics of EA.hy 926 cells in terms of the pattern of prostanoid formation could facilitate studies on endothelial metabolism and role of these important lipid mediators.
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Affiliation(s)
- R Olszanecki
- Jagiellonian University School of Medicine, Krakow, Poland.
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Stadel JM, De Lean A, Lefkowitz RJ. Molecular mechanisms of coupling in hormone receptor-adenylate cyclase systems. Adv Enzymol Relat Areas Mol Biol 2006; 53:1-43. [PMID: 6277164 DOI: 10.1002/9780470122983.ch1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Bao L, Chen S, Wu L, Hei TK, Wu Y, Yu Z, Xu A. Mutagenicity of diesel exhaust particles mediated by cell-particle interaction in mammalian cells. Toxicology 2006; 229:91-100. [PMID: 17147977 DOI: 10.1016/j.tox.2006.10.007] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2006] [Revised: 10/05/2006] [Accepted: 10/09/2006] [Indexed: 11/17/2022]
Abstract
Diesel exhaust particle (DEP) has been identified as a class 2A human carcinogen and closely related to the increased incidence of respiratory allergy, cardiopulmonary morbidity and mortality, and risk of lung cancer. However, the molecular mechanisms of DEP mutagenicity/carcinogenicity are still largely unknown. In the present study, we focused on the mutagenicity of DEPs in human-hamster hybrid (A(L)) cells and evaluated the role of cell-particle interaction in mediating mutagenic process. We found that DEPs formed micron-sized aggregates in the medium and located mainly in large cytoplasmic vacuoles of cells by 24h treatment. The cellular granularity was increased by DEP treatment in a dose-dependent manner. DEPs resulted in a dose-dependent increase of mutation yield at CD59 locus in A(L) cells, while inflicting minimal cytotoxicity. There was a more than two-fold increase of mutation yield at CD59 locus in A(L) cells exposed to DEPs at a dose of 50mug/ml. Such induction was significantly reduced by concurrent treatment with phagocytosis inhibitors, cytochalasin B and ammonium chloride (p<0.05). These results provided direct evidence that DEPs was mutagenic in mammalian cells and that cell-particle interaction played an essential role in the process.
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Affiliation(s)
- Lingzhi Bao
- Key Laboratory of Ion Beam Bioengineering, Institute of Plasma Physics, Hefei, PR China
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Sullivan S, Pells S, Hooper M, Gallagher E, McWhir J. Nuclear reprogramming of somatic cells by embryonic stem cells is affected by cell cycle stage. Cloning Stem Cells 2006; 8:174-88. [PMID: 17009894 DOI: 10.1089/clo.2006.8.174] [Citation(s) in RCA: 26] [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] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Hybrid embryonic stem (ES)-like clones were generated by fusion of murine ES cells with somatic cells that carried a neo resistance gene under the transcriptional control of the Oct-4 promoter. The Oct-4 promoter was reactivated in hybrid ES cells formed by fusion with fetal fibroblasts, and all hybrid colonies were of ES rather than fibroblast phenotype, suggesting efficient reprogramming of fibroblast chromosomes. Like normal diploid murine ES cells, hybrid lines expressed alkaline phosphatase activity and formed differentiated cells derived from the three embryonic germ layers both in vitro and in vivo. Treatments thought to affect nuclear transfer efficiency (ES cell confluence and serum starvation of primary embryonic fibroblasts) were investigated to determine whether they had an effect on reprogramming in cell hybrids. Serum starvation of primary embryonic fibroblasts increased hybrid colony number 50-fold. ES cells were most effective at reprogramming when they contained a high proportion of cells in the S and G2/M phases of the cell cycle. These data suggest that nuclear reprogramming requires an initial round of somatic DNA replication of quiescent chromatin in the presence of ES-derived factors produced during S and G2/M phases.
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Affiliation(s)
- Stephen Sullivan
- Division of Gene Function and Development, Roslin Institute (Edinburgh), Midlothian, United Kingdom
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Timur AA, Wang QK. Construction of somatic cell hybrid lines: fusion of mouse thymidine kinase-deficient 3T3 fibroblasts and human lymphoblastoid cells. Methods Mol Med 2006; 128:33-40. [PMID: 17071988 DOI: 10.1385/1-59745-159-2:33] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Somatic cell hybrids are generated by fusion of two different parental cells. This technology has been used extensively in the production of monoclonal antibodies and has made significant contributions to the field of human genetics through its applications in gene expression, gene mapping, and positional cloning of human disease genes. In our laboratory, we have employed this technique in the positional cloning of several genes for human diseases associated with cytogenetic abnormalities (chromosomal disorders), including translocations. Somatic cell hybrids are constructed by fusing mouse thymidine kinase-deficient 3T3 fibroblasts with human lymphoblastoid cells, as a result of which specific hybrid cells containing only cytogenetically abnormal human chromosomes involved in a chromosomal disorder can be successfully isolated and cloned. These hybrid cells serve as an excellent tool with which to define the exact chromosomal breakpoints involved in a cytogenetic abnormality and to identify genes at the breakpoints.
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Affiliation(s)
- Ayse Anil Timur
- Department of Molecular Cardiology, The Cleveland Clinic Foundation, OH, USA
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