1
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Kilian M, Sheinin R, Tan CL, Friedrich M, Krämer C, Kaminitz A, Sanghvi K, Lindner K, Chih YC, Cichon F, Richter B, Jung S, Jähne K, Ratliff M, Prins RM, Etminan N, von Deimling A, Wick W, Madi A, Bunse L, Platten M. MHC class II-restricted antigen presentation is required to prevent dysfunction of cytotoxic T cells by blood-borne myeloids in brain tumors. Cancer Cell 2023; 41:235-251.e9. [PMID: 36638785 DOI: 10.1016/j.ccell.2022.12.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/20/2022] [Accepted: 12/16/2022] [Indexed: 01/15/2023]
Abstract
Cancer immunotherapy critically depends on fitness of cytotoxic and helper T cell responses. Dysfunctional cytotoxic T cell states in the tumor microenvironment (TME) are a major cause of resistance to immunotherapy. Intratumoral myeloid cells, particularly blood-borne myeloids (bbm), are key drivers of T cell dysfunction in the TME. We show here that major histocompatibility complex class II (MHCII)-restricted antigen presentation on bbm is essential to control the growth of brain tumors. Loss of MHCII on bbm drives dysfunctional intratumoral tumor-reactive CD8+ T cell states through increased chromatin accessibility and expression of Tox, a critical regulator of T cell exhaustion. Mechanistically, MHCII-dependent activation of CD4+ T cells restricts myeloid-derived osteopontin that triggers a chronic activation of NFAT2 in tumor-reactive CD8+ T cells. In summary, we provide evidence that MHCII-restricted antigen presentation on bbm is a key mechanism to directly maintain functional cytotoxic T cell states in brain tumors.
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Affiliation(s)
- Michael Kilian
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Ron Sheinin
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Blavatnik School of Computer Science, Tel Aviv University, 69978 Tel Aviv, Israel
| | - Chin Leng Tan
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Mirco Friedrich
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Faculty of Biosciences, Heidelberg University, Heidelberg, Germany; Department of Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany
| | - Christopher Krämer
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Ayelet Kaminitz
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Khwab Sanghvi
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Katharina Lindner
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Faculty of Biosciences, Heidelberg University, Heidelberg, Germany; Immune Monitoring Unit, National Center for Tumor Diseases (NCT), Heidelberg, Germany
| | - Yu-Chan Chih
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Frederik Cichon
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Joint Immunotherapeutics Laboratory of the DKFZ-Bayer Innovation Alliance, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Benjamin Richter
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Stefanie Jung
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Kristine Jähne
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Miriam Ratliff
- Department of Neurosurgery, University Hospital Mannheim, Mannheim, Germany
| | - Robert M Prins
- Department of Neurosurgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Nima Etminan
- Department of Neurosurgery, University Hospital Mannheim, Mannheim, Germany
| | - Andreas von Deimling
- DKTK CCU Neuropathology, DKFZ, Heidelberg, Germany; Department of Neuropathology, Heidelberg University Hospital, University of Heidelberg, Heidelberg, Germany
| | - Wolfgang Wick
- Neurology Clinic, Heidelberg University Hospital, University of Heidelberg, Heidelberg, Germany; DKTK CCU Neurooncology, DKFZ, Heidelberg, Germany
| | - Asaf Madi
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Lukas Bunse
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Michael Platten
- DKTK Clinical Cooperation Unit (CCU) Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Neurology, MCTN, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Immune Monitoring Unit, National Center for Tumor Diseases (NCT), Heidelberg, Germany; Helmholtz Institute of Translational Oncology (HI-TRON), Mainz, Germany; DKFZ Hector Cancer Institute at the University Medical Center Mannheim, Mannheim, Germany.
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2
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Yeini E, Ofek P, Pozzi S, Albeck N, Ben-Shushan D, Tiram G, Golan S, Kleiner R, Sheinin R, Reich-Zeliger S, Grossman R, Ram Z, Brem H, Hyde T, Magod P, Friedmann-Morvinski D, Madi A, Satchi-Fainaro R. Abstract 2716: P-selectin axis plays a key role in microglia immunophenotype and glioblastoma progression. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-2716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Glioblastoma (GB) is an aggressive type of brain cancer with high mortality rate. It is a highly angiogenic tumor exhibiting an extremely invasive nature. As such, its brain microenvironment plays a crucial role in its progression. Microglia are the brain resident immune cells which have been shown to facilitate GB cell invasion and immune suppression. The mechanism by which GB cells alter microglia behavior is yet to be fully understood. One proposed mechanism involves adhesion molecules such as the Selectins family of proteins which are expressed on the surface of endothelial and immune cells and are involved in immune modulation and cancer immunity. We have previously shown that P-Selectin (SELP) is expressed by GB cells. Here, we investigated the factional role of SELP in GB-microglia interactions. First, we found that microglia cells facilitate the expression and secretion of SELP by GB cells, and that GB cells facilitate the expression of P-Selectin ligand by microglia. We then showed that SELP mediates microglia-enhanced GB invasion and proliferation in 2D and 3D in vitro models and has a role in microglia activation state. These findings were validated in vivo, showing that inhibition or downregulation of SELP leads to reduced tumor growth, increased overall survival and improved immune response. Single-Cells RNA-seq analysis of the tumors revealed an increase in pro-inflammatory microglia signature, reduction in cancer cell tumorigenesis potential and improved T cell activation. Our results indicated that SELP has an important role in GB progression and microenvironment activation. This work can improve our understanding of tumor-associated microglia function and the mechanisms by which GB cells suppress the immune system and invade the brain tissue.
Citation Format: Eilam Yeini, Paula Ofek, Sabina Pozzi, Nitzan Albeck, Dikla Ben-Shushan, Galia Tiram, Sapir Golan, Ron Kleiner, Ron Sheinin, Shlomit Reich-Zeliger, Rachel Grossman, Zvi Ram, Henry Brem, Thomas Hyde, Prerna Magod, Dinorah Friedmann-Morvinski, Asaf Madi, Ronit Satchi-Fainaro. P-selectin axis plays a key role in microglia immunophenotype and glioblastoma progression [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 2716.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Zvi Ram
- 3Tel-Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Henry Brem
- 4Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Thomas Hyde
- 4Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD
| | | | | | - Asaf Madi
- 1Tel-Aviv University, Tel Aviv, Israel
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3
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Yeini E, Ofek P, Pozzi S, Albeck N, Ben-Shushan D, Tiram G, Golan S, Kleiner R, Sheinin R, Israeli Dangoor S, Reich-Zeliger S, Grossman R, Ram Z, Brem H, Hyde TM, Magod P, Friedmann-Morvinski D, Madi A, Satchi-Fainaro R. P-selectin axis plays a key role in microglia immunophenotype and glioblastoma progression. Nat Commun 2021; 12:1912. [PMID: 33771989 PMCID: PMC7997963 DOI: 10.1038/s41467-021-22186-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 03/01/2021] [Indexed: 02/06/2023] Open
Abstract
Glioblastoma (GB) is a highly invasive type of brain cancer exhibiting poor prognosis. As such, its microenvironment plays a crucial role in its progression. Among the brain stromal cells, the microglia were shown to facilitate GB invasion and immunosuppression. However, the reciprocal mechanisms by which GB cells alter microglia/macrophages behavior are not fully understood. We propose that these mechanisms involve adhesion molecules such as the Selectins family. These proteins are involved in immune modulation and cancer immunity. We show that P-selectin mediates microglia-enhanced GB proliferation and invasion by altering microglia/macrophages activation state. We demonstrate these findings by pharmacological and molecular inhibition of P-selectin which leads to reduced tumor growth and increased survival in GB mouse models. Our work sheds light on tumor-associated microglia/macrophage function and the mechanisms by which GB cells suppress the immune system and invade the brain, paving the way to exploit P-selectin as a target for GB therapy.
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Affiliation(s)
- Eilam Yeini
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Paula Ofek
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sabina Pozzi
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Nitzan Albeck
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neurosciences, Tel Aviv University, Tel Aviv, Israel
| | - Dikla Ben-Shushan
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Galia Tiram
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sapir Golan
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ron Kleiner
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ron Sheinin
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sahar Israeli Dangoor
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | | | - Rachel Grossman
- Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Zvi Ram
- Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Henry Brem
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Thomas M Hyde
- Lieber Institute for Brain Development, Johns Hopkins Medical Campus, Baltimore, MD, USA
- Department of Psychiatry & Behavioral Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Prerna Magod
- Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Sherman Building, Tel Aviv University, Tel Aviv, Israel
| | - Dinorah Friedmann-Morvinski
- Sagol School of Neurosciences, Tel Aviv University, Tel Aviv, Israel
- Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Sherman Building, Tel Aviv University, Tel Aviv, Israel
| | - Asaf Madi
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ronit Satchi-Fainaro
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
- Sagol School of Neurosciences, Tel Aviv University, Tel Aviv, Israel.
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4
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Maranda EL, Sheinin R, Brys A, Rubin B, Lim HW. A case of eosinophilic fasciitis associated with pyoderma gangrenosum. J Eur Acad Dermatol Venereol 2017; 31:e356-e358. [PMID: 28150344 DOI: 10.1111/jdv.14148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- E L Maranda
- Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - R Sheinin
- Department of Dermatology, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - A Brys
- Department of Dermatology, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - B Rubin
- Division of Rheumatology, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - H W Lim
- Department of Dermatology, Henry Ford Hospital, Detroit, MI, 48202, USA
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5
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Abstract
BalB/C-3T3 mouse fibroblasts and a temperature-sensitive derivative, ts 2e, were transfected by the calcium phosphatedimethyl sulphoxide procedure to examine the effect of this manipulation on cell cycle progression. Cells were synchronized by growth to confluence in the presence of [2-14C]thymidine to generally label cellular DNA, and then subcultured from the G0 state. Plasmid pSV3-neo or pSV2-neo DNA was added to cells at 24 h post-plating, at peak S phase. At designated intervals prior to, during, and after the transfection procedure, cells were labelled with [methyl-3H]thymidine for 1 h to monitor nascent DNA synthesis and thereby assess cell cycle position. In all experiments performed, irrespective of the time of DNA addition, the transfection manipulations resulted in a reproducible, transient interruption of cell cycle progression, of about 5 h, and manifested as a delay in movement across the subsequent G1-S interface. Thereafter, the cycle resumed normally. The results indicated that the temporal sequence of the cell duplication cycle is altered when cells are exposed to exogenous DNA:Ca3 (PO4)2.
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Affiliation(s)
- C A McBroom
- Department of Microbiology, University of Toronto, Ont., Canada
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6
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Munsch N, Sheinin R. DNA polymerase-primase complex in wild-type and ts A1S9 mouse L-cells, temperature-sensitive for DNA replication during cell cycle progression. J Cell Physiol 1990; 144:531-7. [PMID: 2391381 DOI: 10.1002/jcp.1041440322] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
ts A1S9 mutant cells, derived from wild type WT-4 mouse L-cells, are temperature-sensitive (ts) for DNA synthesis and cell division. We try to determine the cause of the arrest of DNA replication in ts A1S9 cells at the nonpermissive temperature by comparing the modifications induced by the shift of temperature on the activity and the synthesis of DNA polymerase-alpha and DNA primase as a function of time. Forty-seven hours after temperature upshift DNA polymerase-alpha activity of ts A1S9 cells was inhibited by 90% while primase activity was barely detectable. By contrast, the activities of both enzymes increased to a plateau level in WT-4 cultured at either temperature and in ts A1S9 cells grown at the low permissive temperature. Study of the synthesis of DNA polymerase-alpha primase and of the structure of the enzyme complex during cell cycle progression was approached by immunoprecipitation of [35S]-labelled cells, with a specific monoclonal antibody directed against DNA polymerase-alpha. We have found that, irrespective of temperature of cultivation of WT-4 or ts A1S9 cells, this antibody precipitated polypeptides of 220, 186, 150, 110, 68-70, 60, and 48 kDa from cell extracts. With ts A1S9 cells cultivated at 38.5 degrees C for 48 hr the polypeptides of 220 and 186 kDa, associated with alpha-polymerase activity, were considerably more abundant than in the control cells, with a concomitant decline in the polypeptides of 60 and 48 kDa, implicated in primase activity. Thus the inhibition of DNA polymerase-alpha cannot be due to a decreased synthesis of the 186 kDa subunit but to its temperature inactivation. Consistent with a recent asymmetric dimeric model where polymerase-alpha complex and polymerase delta complex synthesize co-ordinately at the replication fork lagging and leading DNA strands, the observed alterations of polymerase-alpha and primase content explain the inhibition of DNA synthesis and the cell cycle arrest of the ts A1S9 cells at the nonpermissive temperature.
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Affiliation(s)
- N Munsch
- Institut de Recherches Scientifiques sur le Cancer, Villejuif, France
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7
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Zacksenhaus E, Sheinin R. Molecular cloning, primary structure and expression of the human X linked A1S9 gene cDNA which complements the ts A1S9 mouse L cell defect in DNA replication. EMBO J 1990; 9:2923-9. [PMID: 2390975 PMCID: PMC552008 DOI: 10.1002/j.1460-2075.1990.tb07483.x] [Citation(s) in RCA: 36] [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] [Indexed: 11/11/2022] Open
Abstract
The temperature-sensitive ts A1S9 mutation of mouse L cells was previously shown to affect nuclear DNA replication and to be complemented by active and inactive human X chromosomes in human-ts A1S9 somatic cell hybrids. We report the isolation of cDNA clones which correct the ts A1S9 lesion, using as a probe a genomic fragment derived from the human A1S9 locus. The nucleotide sequence of the A1S9 cDNA encompasses a single open reading frame of 2409 bp which could encode a heretofore unreported protein of 90 393 daltons. Southern blot hybridization of the A1S9 cDNA probe with DNA from various species revealed homologous sequences in vertebrates but not in yeast. Northern blot analysis of serum-starved, synchronized cells demonstrated that the A1S9 gene was expressed at a relatively low level in quiescent cells and at a higher and constant level throughout the cell cycle. Human cell lines harbouring increasing numbers of inactive X chromosomes (47, XXX, 49, XXXXX) were found to express the A1S9 gene at the same level as control cells (45, X), suggesting that the gene does not escape X chromosome inactivation.
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Affiliation(s)
- E Zacksenhaus
- Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada
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8
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Zacksenhaus E, Sheinin R, Wang HS. Localization of the human A1S9 gene complementing the ts A1S9 mouse L-cell defect in DNA replication and cell cycle progression to Xp11.2----p11.4. Cytogenet Cell Genet 1990; 53:20-2. [PMID: 2323223 DOI: 10.1159/000132887] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The temperature-sensitive ts A1S9 mouse L-cell mutant is defective in an X-linked gene essential for progression of cells through the S phase of the cell division cycle. A single copy fragment derived from the complementing human A1S9 gene was used as a probe to localize the gene on the X chromosome. Southern blot analysis of human x rodent hybrids and in situ hybridization to human metaphase chromosomes allowed the regional assignment of the human A1S9 gene to Xp11.2----p11.4.
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Affiliation(s)
- E Zacksenhaus
- Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada
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9
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Bhimji S, Sheinin R. Dr. Edna Mary Guest: she promoted women's issues before it was fashionable. CMAJ 1989; 141:1093-4. [PMID: 2680010 PMCID: PMC1451476] [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: 01/02/2023] Open
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10
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Zacksenhaus E, Sheinin R. Molecular cloning of human A1S9 locus: an X-linked gene essential for progression through S phase of the cell cycle. Somat Cell Mol Genet 1989; 15:545-53. [PMID: 2595454 DOI: 10.1007/bf01534915] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The temperature-sensitive (ts) A1S9 mouse L-cell mutant is defective in an X-linked gene essential for the progression of cells through the S phase of the cell duplication cycle. We recently reported the complementation of the ts A1S9 cell defect with total human DNA and the isolation of independent temperature-resistant transformants that retained a common set of human specific Alu-containing fragments. Here we describe the molecular cloning of these human DNA sequences from one of the secondary transformants. ST-1-0. A genomic library prepared from ST-1-0 was screened with a total human DNA probe, and two recombinant bacteriophages carrying overlapping segments were isolated. The cloned region was extended in both directions using a human X-chromosome specific library. In total, a human region spanning 42 kb in length, and containing all the Alu-specific DNA sequences found in ST-1-0, was isolated in five overlapping recombinant phages. The A1S9 gene appeared to be larger than the DNA recovered in individual phage isolates, as was assessed by transfection experiments. A single-copy probe derived from the phage DNA was shown to be conserved in independent primary, secondary, and tertiary transformants of ts A1S9 cells and mapped to the X chromosome by molecular hybridization. Northern blot hybridization of this probe with poly(A)+ mRNA derived from ST-1-0 cells identified a transcript of about 3.6 kb.
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Affiliation(s)
- E Zacksenhaus
- Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada
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11
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Brown CJ, Powers VE, Munroe DL, Sheinin R, Willard HF. Gene on short arm of human X chromosome complements murine tsA1S9 DNA synthesis mutation. Somat Cell Mol Genet 1989; 15:173-8. [PMID: 2928842 DOI: 10.1007/bf01535079] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We have created somatic cell hybrids between the temperature-sensitive mouse cell line tsA1S9 and human cell lines in order to localize the human gene (A1S9T) complementing the cell cycle defect of the murine line. Segregation of the human X chromosome is completely concordant with growth at the nonpermissive temperature. Hybrids retaining the X chromosome are temperature-resistant, whereas those without a human X are temperature-sensitive. Further hybrids made using human cell lines with X-autosome translocations indicate that the A1S9T gene is located on the short arm of the human X chromosome.
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Affiliation(s)
- C J Brown
- Department of Medical Genetics, University of Toronto, Canada
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12
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Sheinin R, Bhimji S. Pearl Jane Manson Sproule, MD (1879-1961) Canada's first woman otolaryngologist: a belated tribute. J Otolaryngol 1988; 17:409-10. [PMID: 3068373] [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: 01/04/2023]
Abstract
Pearl Jane Manson enrolled in the Ontario Medical College for Women in 1904 and graduated with an M.D. degree from the University of Toronto in 1907. She was admitted to the Royal College of Surgeons of England in 1911 and worked at a hospital in England during World War I. On returning to Toronto she held positions both at Toronto General Hospital and Women's College Hospital, where she became Chief of the ENT Department in 1926. She was keenly interested in epidemiology and the prevention of infections in women and children. In 1931 she became a Fellow of the Royal College of Physicians and Surgeons of Canada and also the American College of Surgeons. She was the first woman physician in Canada to become a specialist and gain recognition as a clinical scientist.
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Affiliation(s)
- R Sheinin
- School of Graduate Studies, University of Toronto, Ontario, Canada
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13
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Zacksenhaus E, Sheinin R. Identification of human gene complementing ts AlS9 mouse L-cell defect in DNA replication following DNA-mediated gene transfer. Somat Cell Mol Genet 1988; 14:371-9. [PMID: 3399963 DOI: 10.1007/bf01534645] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The temperature-sensitive (ts) mouse L-cell, ts AlS9, is defective in a gene required for nuclear DNA replication early in the S phase of the cell cycle. Human DNA sequences were introduced into ts AlS9 cells together with the plasmid pSV2neo, which can confer resistance to the drug geneticin. Cotransformants, expressing both the plasmid-derived neomycin gene and the transferred human AlS9 gene, were selected for growth in the presence of the drug at the nonpermissive temperature (npt). The resulting transformants retained a common set of human-specific Alu repetitive DNA sequences. These are likely to be accommodated within, or in proximity to, the transferred human AlS9 gene. The results obtained provide the basis for cloning human genes required for DNA replication.
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Affiliation(s)
- E Zacksenhaus
- Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada
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14
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Sheinin R, Mirjah D, Dubsky M, Sigouin J. DNA synthesis in BalB/C-3T3 ts 2 cells is restricted by a temperature-sensitive function of late G1 phase. Biochemistry 1986; 25:1208-16. [PMID: 3964672 DOI: 10.1021/bi00354a003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
ts 2 BalB/C-3T3 mouse fibroblasts are cdc mutants, which arrest late in G1, at or near the G1/S traverse, upon full expression of the heat-sensitive lesion. The kinetics of temperature inhibition of DNA synthesis in logarithmically growing cultures reveal three stages of heat inactivation. During the first generation time equivalent, normal semiconservative, semidiscontinuous replication proceeds but is reduced as cells exit and do not reenter S phase. During a second such period, a minimal rate of normal DNA synthesis is maintained. Thereafter, as the cells move into a third aborted cell division cycle, the rate of DNA synthesis increases. However, all semiconservative synthesis is then replaced by DNA repair replication. Temperature inactivation of the ts 2 protein results in shutdown of nuclear DNA synthesis. In contrast, normal replication of mitochondrial DNA proceeds at control rate throughout the first stage of temperature inactivation. Synthesis of this organellar genome is quantitatively reduced as the cells move into the second phase of heat inhibition. Titration of chromatin-bound DNA with ethidium bromide revealed that wild-type cells exhibit a changing DNA topology as the temperature is raised. Temperature-inactivated ts 2 cells behave as though their DNA has been topologically frozen in the configuration of control cells at or near entry into S phase.
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Sheinin R, Dubsky M, Naismith L, Sigouin J. Cell cycle arrest of heat-inactivated ts 2 BALB/c-3T3 mouse fibroblasts, temperature-sensitive for DNA synthesis. Exp Cell Res 1985; 161:393-405. [PMID: 4065226 DOI: 10.1016/0014-4827(85)90096-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The ts 2 derivative of BALB/c-3T3 mouse fibroblasts is a cell division cycle (cdc) mutant. Upon expression of the heat-sensitive defect, ts 2 cells arrest late in G1 at, or very near the G1/S traverse. This conclusion derives from three kinds of experiment. In the first the cells were brought to different stages of the cell cycle by physiological manipulation, or with specific anti-metabolites. They were then released from the resulting blocks, and their subsequent cell-cycle progression, at the permissive- and non-permissive temperature (npt), was followed. The second experiment was an execution point analysis. In the third, premature chromosome condensation was performed between metaphase HeLa cells and temperature-blocked ts 2 cells. The resulting prematurely-condensed chromosomes were largely of the morphotype of very late G1 cells. The ts 2 cells are prevented from expressing their defect by temporary incubation at 38.5 degrees C in the G0, non-cycling state and by prior arrest in early S phase, imposed by hydroxyurea treatment. Such prevention is not allowed ts 2 cells incubated at the npt in the absence of isoleucine, a procedure which brings cells to mid-G1 arrest.
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Sheinin R, Fabbro J, Dubsky M. Mouse polyoma virus and adenovirus replication in mouse cells temperature-sensitive in DNA synthesis. Intervirology 1985; 24:174-80. [PMID: 2999031 DOI: 10.1159/000149638] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Mouse adenovirus multiplies, apparently without impediment, in temperature-inactivated ts A1S9, tsC1 and ts2 mouse fibroblasts. Thus, the DNA of mouse adenovirus can replicate in the absence of functional DNA topoisomerase II, a DNA-chain-elongation factor, and a protein required for traverse of the G1/S interface, respectively, encoded in the ts A1S9, tsC1 and ts2 genetic loci. These results are compared with those obtained with polyoma virus.
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Colwill RW, Sheinin R. ts A1S9 locus in mouse L cells may encode a novobiocin binding protein that is required for DNA topoisomerase II activity. Proc Natl Acad Sci U S A 1983; 80:4644-8. [PMID: 6308635 PMCID: PMC384100 DOI: 10.1073/pnas.80.15.4644] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Nuclear novobiocin binding proteins (NBPs) from a set of mouse L cells have been extensively purified by affinity chromatography on novobiocin-Sepharose columns. The NBPs, specifically eluted with 100 micrograms of novobiocin per ml, exhibited equivalent DNA topoisomerase activities (measured as ATP-dependent relaxation or catenation of phi X174 replicative-form I DNA substrate) when extracted from equal numbers of wild-type (WT-4) mouse L cells growing logarithmically at 34 degrees C or at 38.5 degrees C, from ts A1S9 cells similarly cultivated at the low, permissive temperature or from revertant ts+ AR cells in exponential growth at either temperature. The NBPs isolated from similar numbers of ts A1S9 cells grown to midlogarithmic phase and then incubated for 24 hr at 38.5 degrees C (the nonpermissive temperature) showed no topoisomerase II activity. Preliminary NaDodSO4/polyacrylamide gel electrophoretic analysis of enzymatically active material revealed that the NBPs of WT-4 and ts+ AR cells grown at 34 degrees C comprised three major polypeptides of 76,000, 74,000, and 30,000 daltons and a number of larger molecular mass components present in trace amounts. The NBP of ts A1S9 cells grown at the permissive temperature was similar, except that the 30,000-kilodalton polypeptide was not detected. Such enzymatically active NBPs from WT-4 and ts+ AR cells were unaffected by 100 micrograms of novobiocin per ml, whereas the analogous preparation from ts A1S9 cells was totally inhibited. On the basis of these and other considerations, it is postulated that the ts A1S9 locus of mouse L cells encodes a temperature-sensitive polypeptide that is required for normal DNA topoisomerase II activity.
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Abstract
Several different forms of progeny viral DNA can be identified in polyoma virus (Py)-infected mouse L-cells. The majority comprise mature form I superhelical DNA and the circular, double-stranded "theta" replicating intermediates in which the progeny DNA strands never exceed the unit genome length of the template. There is formed, in addition, a minority fraction of multimeric, linear, double-stranded Py DNA molecules that sediment heterogeneously at 28 to 35S and greater than 35S. Restriction enzyme analysis of these large Py DNA molecules reveals them to be tandem arrays of multiple unit genome lengths, covalently linked head to tail. It is estimated that the 28 to 35S multimeric DNA has an average size of about 20 megadaltons, made up of 6 to 20 Py genome units. The greater than 35S Py DNA is, of course, larger. Kinetic analysis indicates that formation of the monomeric progeny viral DNA and the 28 to 35S multimeric Py DNA reaches a peak at about 35 to 36 h postinfection. Synthesis of the very large linear molecules of greater than 35S is first detected after this interval and continues thereafter. The de novo synthesis of all of these progeny Py DNA molecules proceeds apparently normally in Py-infected tsA1S9 mouse L-cells incubated at 38.5 degrees C under conditions which restrict normal cellular DNA replication. These findings suggest that the cellular DNA topoisomerase II activity, encoded in the tsA1S9 locus (R. W. Colwill and R. Sheinin, submitted for publication), is not required for de novo formation of any form of Py DNA. However, the total amount made and the rate of synthesis of the large molecular weight Py DNA are affected very late in temperature-inactivated tsA1S9 cells.
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Colwill RW, Sheinin R. Novobiocin sensitivity and chromatin conformation in wild-type and temperature-sensitive mouse L cells. ACTA ACUST UNITED AC 1982. [DOI: 10.1139/o82-024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The ts A1S9 cell is a dnats mutant of mouse L cells which exhibits enhanced sensitivity to killing by the antibiotic novobiocin, as compared with the parental wild-type (WT-4) cell, another dnats mouse L cell (ts C1), and other mammalian cells. Such a response was not detected with other cytotoxic agents tested. Novobiocin inhibits DNA synthesis in ts A1S9 cells, at concentrations which have little or no effect on RNA or protein synthesis. Enhanced novobiocin sensitivity is not due to altered cellular permeability to the drug, since ts A1S9 cells do not take up more antibiotic than do WT-4 or ts+ AR mouse L cells. A ts+ revertant of ts A1S9 cells exhibits a wild-type pattern of novobiocin sensitivity, suggesting that novobiocin resistance may be encoded in the ts A1S9 locus. These findings led to a study of DNA conformation which revealed that the nuclear, chromatin-bound DNA of temperature-inactivated ts A1S9 cells sediments differently in ethidium bromide sucrose density gradients than does that of WT-4 cells grown at 38.5 °C. These observations suggest that expression of the ts A1S9 defect results in a more highly constrained conformation of the DNA, relative to that in control cells, and that in this configuration the DNA may be unable to act as template for replication.
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Savard P, Poirier GG, Sheinin R. Poly(ADP-ribose) polymerase activity in mouse cells which exhibit temperature-sensitive DNA synthesis. Biochim Biophys Acta 1981; 653:271-5. [PMID: 6261825 DOI: 10.1016/0005-2787(81)90162-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The poly(ADP-ribose) polymerase activity of wild-type mouse L cells and of Balb/C-3T3 mouse fibroblasts remained relatively unchanged (at approx. 400 nmol substrate utilized/mg DNA per h) in actively-growing cells incubated at 34 degrees C or at 38.5 degrees C for at least 72 h. A similar result was obtained with the following temperature-sensitive cells grown at the permissive temperature (34 degrees C): ts A1S9 mouse L cells, ts C1 mouse L cells and Balb/C-3T3 ts mouse fibroblasts. The poly(ADP-ribose) polymerase activity of the temperature-sensitive cells was little affected during incubation for 20-24 h at the non-permissive temperature of 38.5 degrees C under which conditions temperature-inactivation of DNA replication was complete. Thereafter, this enzyme activity was found to increase some 2-fold, at a time when normal semi-conservative DNA synthesis was totally suppressed and replaced by repair replication (Sheinin, R. and Guttman, S. (1977) Biochim. Biophys. Acta 479, 105-118; Sheinin, R., Dardick, I. and Doane, F.W. (1980) Exp. Cell. Res., in the press).
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Sheinin R. Tumor viruses as modifiers of the nuclear genome of eukaryotic cells. Ann N Y Acad Sci 1981; 361:435-60. [PMID: 6941733 DOI: 10.1111/j.1749-6632.1981.tb46537.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Sheinin R, Setterfield G, Dardick I, Kiss G, Dubsky M. Relationship between chromatin structure and replication in mouse L-cells. Can J Biochem 1980; 58:1359-69. [PMID: 6454476 DOI: 10.1139/o80-185] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Mouse L-cells treated with cytosine arabinoside, hydroxyurea, fluorodeoxyuridine, methotrexate, or mitomycin C rapidly cease DNA synthesis and stop dividing. Such inhibition of DNA replication is followed by interruption of formation of lysine- and arginine-containing proteins, including chromatin-bound histones, and by a major reorganization of the heterochromatin of the central nucleoplasm, manifest as disaggregation of large clumps of this condensed chromatin. Morphometric analysis revealed both cell and nuclear enlargement in cells treated with such antimetabolites of DNA replication. These observations are in contrast to those made with WT-4 cells starved of isoleucine or treated with cycloheximide. Isoleucine depletion was associated with inhibition of DNA synthesis and continued increase of cell and nuclear volume, but not with massive disaggregation of heterochromatin. Cycloheximide produced inhibition of DNA synthesis and protoplasmic growth, and also prevented structural reorganization of chromatin. A model is presented which suggests that initiation of chromatin replication is associated with a process, dependent upon de novo protein synthesis, which results in chromatin disaggregation. This can be revealed by inhibition of the correct replication of chromatin DNA and chromatin protein.
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Sparkuhl J, Sheinin R. Protein synthesis and degradation during expression of the temperature-sensitive defect in ts A1S9 mouse L-cells. J Cell Physiol 1980; 105:247-58. [PMID: 6161937 DOI: 10.1002/jcp.1041050208] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The involvement of altered protein metabolism in the expression of the temperature-sensitive (ts) pleiotropic phenotype of ts A1S9 cells was investigated. Cells are ts in growth and DNA replication. They undergo decondensation of their heterochromatin, interruptions of chromatin synthesis, and changes in cell size and morphology at the non-permissive temperature (npt) of 38.5 degrees C. Whereas the rates of incorporation of 3H-leucine, 35S-methionine, and 3H-fucose into proteins were unaffected at 38.5 degrees C, net protein accumulation was greatly reduced. This imbalance resulted from a rapid increase in the rate of protein degradation at the npt. Enhancement of protein degradation was detected within 2-4 hours after temperature upshift and constitutes the earliest metabolic alteration thus far observed during expression of the temperature-sensitive phenotype. The average half-life of proteins performed in ts A1S9 cells at 34 degrees C was decreased four-fold at the npt, and all major cytoplasmic proteins were affected equally. Enhanced protein degradation at the npt was shown to be sensitive to cycloheximide, ammonia, chloroquine, and vinblastine at concentrations that did not affect the basal protein degradation of normally cycling cells. Increased protein degradation at 38.5 degrees C did not involve an equivalent increase in total cellular protease activity. The data obtained are compatible with a model that suggests that temperature inactivation of the ts A1S9 gene product results in activation of a lysosome-mediated mechanism for the rapid degradation of cytoplasmic proteins.
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Sheinin R, Lewis PN. DNA and histone synthesis in mouse cells which exhibit temperature-sensitive DNA synthesis. Somatic Cell Genet 1980; 6:225-39. [PMID: 7394699 DOI: 10.1007/bf01538798] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
It is demonstrated that temperature inactivation of histone synthesis is coupled to inhibition of DNA replication in ts AlS9 and ts Cl mouse L-cells, which are temperature-sensitive (ts) in an S-phase function. In contrast, uncoupling of histone and DNA synthesis occurs in BalB/C-3T3 ts 2 cells which are ts in a function of the pre-DNA-synthetic phase. Termination of histone synthesis in ts AlS9 and ts Cl cells is 16--18 h after onset of temperature inactivation of DNA replication and appears to be associated with general cessation of chromatin replication triggered by the earlier event. Synthesis of histone and other chromosomal proteins proceeds in ts 2 cells under conditions in which DNA synthesis undergoes temperature inactivation. It is suggested that the terminal phenotype of coupled temperature inactivation of DNA and histone synthesis may be diagnostic of cells ts in an S-phase function and may therefore be a useful secondary screen in designation of cell cycle mutants.
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Dardick I, Setterfield G, Sheinin R. Animal model of human disease. Megaloblastic anemia. Am J Pathol 1978; 93:849-52. [PMID: 717546 PMCID: PMC2018346] [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: 12/24/2022]
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Abstract
When temperature-sensitive (ts) mutant lines of mouse L-cells, ts AIS9 and ts CI, are shifted from 34C to 38.5C, a rapid inhibition of DNA synthesis and mitosis occurs. During this phase, cell and nuclear growth continues and results in a substantial increase in cell and nuclear volume. Such cellular modifications are also associated with a marked dispersal of the condensed chromatin masses of interphase nuclei, so that after 48-72 h of incubation at 38.5C, nuclear profiles of both ts cell lines bear a striking resemblance to the nuclear features characteristic of megaloblastic anaemia. Despite these marked alterations in nuclear chromatin organization, morphometric analysis indicates that the volume of condensed chromatin does not decrease. Current biochemical, cytological and morphometric data on the two ts lines of mutant mouse L-cells during expression of the mutation, suggest that they might provide a useful model to further elucidate cytological features of megaloblastic anaemia.
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Humbert J, Sheinin R. Properties of an invitro system for studying temperature-sensitive DNA synthesis in ts A1S9 mouse L-cells. Can J Biochem 1978; 56:444-51. [PMID: 667691 DOI: 10.1139/o78-069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The in vitro DNA synthesis has been observed in whole cell lysates and in cytosol and nuclear fractions of wild-type (WT-4) mouse L-cells and ts A1S9 cells which exhibit temperature-sensitive (ts) DNA replication in vivo. The product, labelled with substrate 3H-labelled TTP, is resistant to alkali and has the buoyant density (1.709 g/cm3) expected for normal mouse DNA. Pulse-chase studies, in which newly made, single-stranded DNA was analyzed by velocity sedimentation in alkaline sucrose density gradients, revealed that in vitro DNA synthesis proceeds by a discontinuous mechanism. Approximately half of the DNA made in a 30-s pulse sedimented at 3–8S; the rest was very heterogeneous with S values between [Formula: see text] and 30S. After incubation for up to 300 s, a majority of the newly made DNA (>85%) sedimented as the larger, heterogeneous material, with some cosedimenting with chromosomal size DNA.The ts DNA synthesis phenotype of ts A1S9 cells is expressed in vitro. Thus, the activity of extracts of ts cells incubated at the nonpermissive (38.5 °C) temperature was commensurate with the in vivo activity. Restriction of the ts phenotype to DNA synthesis is evident in vitro since the RNA synthetic activity of lysates of temperature-inactivated ts A1S9 cells was equivalent to that of extracts obtained from cells grown at the permissive temperature (33.5 °C). The DNA synthetic activity of nuclei from WT-4 or ts A1S9 cells grown at 33.5 °C plus homologous cytosol is equivalent to that of the whole lysate. In contrast, such cytosol preparations give little, if any, enhancement of the activity of nuclei from ts A1S9 cells incubated at 38.5 °C for 16 h. The cytosol of such temperature-inactivated cells, which are almost fully effective with nuclei of control cells, produce little or no enhancement of DNA synthesis by homologous nuclei.
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Setterfield G, Sheinin R, Dardick I, Kiss G, Dubsky M. Structure of interphase nuclei in relation to the cell cycle. Chromatin organization in mouse L cells temperature-sensitive for DNA replication. J Cell Biol 1978; 77:246-63. [PMID: 659512 PMCID: PMC2110034 DOI: 10.1083/jcb.77.1.246] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Mutant lines of mouse L cells, TS A1S9, and TS C1, show temperature-sensitive (TS) DNA synthesis and cell division when shifted from 34 degrees to 38.5 degrees C. With TS A1S9 the decline in DNA synthesis begins after 6-8 h at 38.5 degrees C and is most marked at about 24 h. Most cells in S, G2, or M at temperature upshift complete one mitosis and accumulate in the subsequent interphase at G1 or early S as a result of expression of a primary defect, failure of elongation of newly made small DNA fragments. Heat inactivation of TS C1 cells is more rapid; they fail to complete the interphase in progress at temperature upshift and accumulate at late S or G2. Inhibition of both cell types is reversible on return to 34 degrees C. Cell and nuclear growth continues during inhibition of replication. Expression of both TS mutations leads to a marked change in gross organization of chromatin as revealed by electron microscopy. Nuclei of wild-type cells at 34 degrees and 38.5 degrees C and mutant cells at 34 degrees C show a range of aggregation of condensed chromatin from small dispersed bodies to large discrete clumps, with the majority in an intermediate state. In TS cells at 38.5 degrees C, condensed chromatin bodies in the central nuclear region become disaggregated into small clumps dispersed through the nucleus. Morphometric estimation of volume of condensed chromatin indicates that this process is not due to complete decondensation of chromatin fibrils, but rather involves dispersal of large condensed chromatin bodies into finer aggregates and loosening of fibrils within the aggregates. The dispersed condition is reversed in nuclei which resume DNA synthesis when TS cells are downshifted from 38.5 degrees to 34 degrees C. The morphological observations are consistent with the hypothesis that condensed chromatin normally undergoes an ordered cycle of transient, localized disaggregation and reaggregation associated with replication. In temperature-inactivated mutants, normal progressive disaggregation presumably occurs, but subsequent lack of chromatin replication prevents reaggregation.
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Sheinin R, Darragh P, Dubsky M. Some properties of chromatin synthesized by mouse-L-cells temperature-sensitive in DNA replication. J Biol Chem 1978; 253:922-6. [PMID: 621211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
When ts A1S9 mouse L-cells are incubated at the nonpermissive temperature (38.5 degrees) DNA synthesis proceeds at the normal rate for 6 to 8 h; it then declines to attain 1 to 5% of this rate after 24 h. General protein synthesis from precursor leucine is relatively unaffected by the high temperature. In contrast, protein formation from lysine (and arginine) remains unchanged for 12 to 15 h after temperature upshift. It then drops and plateaus at about 25% of the initial rate after 32 h. The chromatin protein and DNA are fully conserved in ts A1S9 cells incubated at 38.5 degrees for at least 24 h after full expression of the ts defect. Temperature inactivation of the ts A1S9 gene product results in inhibition of de novo formation of chromatin. This is evidenced by coordinate suppression of incorporation of dThd and of lysine and arginine into chromatin-bound DNA and histone, respectively.
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Sheinin R, Guttman S. Semi-conservative and non-conservative replication of DNA in temperature-sensitive mouse L-cells. Biochim Biophys Acta 1977; 479:105-18. [PMID: 911846 DOI: 10.1016/0005-2787(77)90130-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The mode of DNA replication has been studied in wild-type mouse L-cells (WT-4) and in two subclones (TS A1S9 and ts C1 cells) which are temperature-sensitive in DNA synthesis. It has been demonstrated that DNA is replicated by the semi-conservative mechanism in WT-4 cells grown at 34 degrees C or at 38.5 degrees C throughout the logarithmic phase and into the stationary phase. Similar results were obtained with ts A1S9 and ts C1 cells grown at the permissive temperature (34 degrees C). When the latter cells were incubated at the non-permissive temperature (38.5 degrees C) inactivation of DNA synthesis appeared to proceed through three general stages. During the first 24 h after temperature upshift suppression of semi-conservative DNA replication occurred. During the second stage a very low level of semi-conservative synthesis was maintained. During the third stage, incorporation of dThd into DNA began to increase, often reaching 10-20% of control levels after 3-5 days. During this third stage DNA synthesis was effected by a non-conservative mechanism. Temperature-inactivated ts A1S9 cells and ts C1 cells were able to perform semi-conservative synthesis upon back-shift to 34 degrees C, using as template that DNA synthesized prior to temperature upshift.
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Sheinin R, Darragh P, Dubsky M. Mitochondrial DNA synthesis in mouse L cells temperature sensitive in nuclear DNA replication. Can J Biochem 1977; 55:543-7. [PMID: 560242 DOI: 10.1139/o77-077] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Temperature-sensitive (ts) A 1S9 mouse L cells continue to synthesize double-stranded covalently closed mitochondrial (mt) DNA at a temperature (38.5 degrees C) which is nonpermissive for chromosomal DNA replication. The amount of mt DNA made appears to be quantitatively linked to nuclear DNA synthesis. Nuclear DNA replication proceeds normally for 6-8 h after the cells are shifted to 38.5 degrees C, and then declines to reach a minimum at 20-24 h. The level of mt DNA synthesis remains high during this period and decreases once the ts lesion has been established.
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Shopsis C, Sheinin R. Biosynthesis of plasma membrane components by SV40-virus-transformed 3T3 mouse cells temperature sensitive for expression of some transformed cell properties. Biochim Biophys Acta 1976; 433:101-17. [PMID: 177078 DOI: 10.1016/0005-2736(76)90181-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We have studied the plasma membranes of an SV40-transformed 3T3 cell line temperature sensitive for the transformed growth phenotype (ts H6-15 cells), and have found that they vary little as a function of temperature of cultivation. Analysis by polyacrylamide gel electrophoresis was performed on plasma membranes prepared from ts H6-15 cells cultured at the permissive (32 degrees C) and non-permissive (39 degrees C) temperatures and radioactively-labelled in several ways. No significant differences were seen when the electrophoretic patterns of polypeptides of the plasma membranes of ts H6-15 cells, grown through 3-4 generations in medium containing radioactive leucine (32 degrees C and 39 degrees C temperatures) were compared. Plasma membranes derived from cells similarly grown in medium with radioactive glucosamine indicated that extensive alterations in the intrinsic glycopeptides occurred in association with alteration in growth phenotype. A shift towards decreased synthesis of large molecular weight (congruent to 100 000-160 000) glycopeptides occurred in cells grown at the temperature of non-transformed growth (39 degrees C). A decrease in amount of a 120 000 molecular weight glycopeptide at 39 degrees C was the most prominent of these alterations. We have studied the surface exposure of polypeptides and glycopeptides of intact cells grown at 32 and 39 degrees C, using lactoperoxidase-catalyzed iodination, NaBH4 reduction of galactose oxidase-treated cells, and metabolic-labelling with glucosamine of trypsin-sensitive molecules. We found no major qualitative differences between whole cell extracts or between plasma membrane preparations of cells cultivated at the permissive and non-permissive temperatures. Of special interest was the observation that the formation and surface exposure of a trypsin-sensitive, 240 000 molecular weight polypeptide appeared not to be ts in ts H6-15 cells. The significance of these observations will be discussed.
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Sheinin R, Shopsis C. A consideration of the role of cell surface macromolecules in the process of viral transformation. In Vitro 1976; 12:198-207. [PMID: 177354 DOI: 10.1007/bf02796442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
There is extensive physiological evidence implicating the cell surface as the key organelle which mediates the cell:cell interactions which underlie both normal and neoplastic growth. This information has now been supplemented with biochemical and biophysical data which indicates that surface macromolecules, in particular the heteroglycans of transformed cells, differ from those which lie at the periphery of normal cells. In the case of cells neoplastically transformed by most tumour viruses it is clear that the small virus genome (2-5 x 10(6) daltons) cannot carry the total genetic information to accomodate these various biochemical modifications, if indeed they are encoded in separate genes (1). To examine the part played in transformation by cellular genes coding for surface heteroglycan formation, we have turned to a study of SV-3T3 cells (ts H6-15) which are temperature-sensitive for expression of the transformed cell phenotype (2). The data show that cells grown under conditions permissive and non-permissive for such expression exhibit the same pattern of formation of glycolipids, and the majority of the polypeptides of the plasma membrane. There are, however, significant differences in the synthesis of some glycopeptides. A large molecular weight, trypsin-labile glycopeptide, present at the surface of untransformed fibroblasts but barely measurable in some of their virus-transformed derivatives (3), was detected, essentially at the same level, at the surface of ts H6-15 cells grown at the permissive and non-permissive temperatures. The signficance of these observations is discussed.
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Abstract
Temperature-sensitive ts A1S9 mouse L cells synthesize DNA apparently normally for 6-8 hr upon incubation at 38.5 degrees C. Thereafter, these cells are able to perform limited polydeoxyribonucleotide chain synthesis at the high temperature, but are unable to convert newly replicated small single-strand segments of DNA (of the order of molecular weight 10(6) daltons) to large molecular weight chromosomal DNA. Data obtained are compatible with a model which suggests that ts A1S9 cells are able to carry out most individual reactions of DNA synthesis at the high temperature, but are temperature-sensitive in a protein which participates in the joining of small DNA segments to make chromosomal DNA strands. When cells are reincubated at a permissive temperature, after the temperature-sensitive lesion has been established, they recover the latter capability several hours before they are able once again to synthesize DNA at normal rates.
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Abstract
Evidence accumulated over a period of 60 years has clearly established that a number of different viruses cause neoplasia (of a broad spectrum) amongst a variety of animals. Although it is known that viruses do produce self-limiting proliferative human diseases, complete verification of a human viral carcinogen remains to be provided. This paper presents an overview of the conceptual and practical tools for the detection of tumor viruses, which have derived from experimental model systems. It indicates how these are being applied to studies of human malignant disease, with special reference to assessing a possible viral etiology for laryngeal cancer.
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Sheinin R, Yogeeswaran G, Murray RK. Synthesis of surface glycoproteins and glycosphingolipids in db-cAMP-treated normal and virus-transformed 3T3 cells. Exp Cell Res 1974; 89:95-104. [PMID: 4373263 DOI: 10.1016/0014-4827(74)90191-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Mak TW, Aye MT, Messner H, Sheinin R, Till JE, McCulloch EA. Reverse transcriptase activity: increase in marrow cultures from leukaemic patients in relapse and remission. Br J Cancer 1974; 29:433-7. [PMID: 4137170 PMCID: PMC2009110 DOI: 10.1038/bjc.1974.95] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
An enzyme activity with the characteristics of reverse transcriptase was detected in marrow from patients with leukaemia in relapse and in firm haematological remission. The endogenous enzyme activities increased following culture, and in remission patients the enzyme activities reached levels equal to or exceeding those found in relapse.
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Branton PE, Sheinin R. Studies on the replication of polyoma DNA: physicochemical properties of viral DNA synthesized when protein synthesis is inhibited. Can J Biochem 1973; 51:305-17. [PMID: 4349466 DOI: 10.1139/o73-036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Physicochemical, electron microscopic, and enzymatic studies have been carried out to analyze the structure of the polyoma DNA synthesized under conditions in which de novo protein synthesis is inhibited late during infection, and in which (as shown elsewhere) the maturation of progeny viral DNA to yield superhelical, fully covalently closed DNA is blocked. The evidence indicated that viral DNA molecules are accumulated which, upon deproteinization and extraction, give rise to the following: (i) form II Py DNA, double-stranded, circular with one single-strand break; (ii) circular dimers; (iii) form-II-like molecules, but carrying double-stranded, linear "tails".
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Yogeeswaran G, Sheinin R, Wherrett JR, Murray RK. Studies on the glycosphingolipids of normal and virally transformed 3T3 mouse fibroblasts. J Biol Chem 1972; 247:5146-8. [PMID: 4341540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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Abstract
It was previously shown that the majority of deoxyribonucleic acid (DNA) made in growing mouse embryo cells productively infected at low multiplicity with polyoma virus is cellular in nature and that some of this cell DNA contains discontinuities in the newly synthesized strand. Evidence obtained indicates the following. (i) Induction of cell DNA synthesis precedes the onset of detectable viral DNA replication by approximately 3 hr. (ii) Double-stranded cell DNA molecules, discontinuous in the newly synthesized strands, arise by direct synthesis (rather than by degradation of a high-molecular-weight precursor) only in the cell DNA replicated after initiation of viral DNA synthesis. (iii) This DNA component is continuously formed throughout the "late" stage of infection and is continuously converted into apparently normal cell DNA of high molecular weight without prior degradation to acid-soluble components.
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Cheevers WP, Sheinin R. RNA synthesis in polyoma virus-infected cells. I. Pattern of formation of polyribosome-associated messenger RNA during productive infection. Can J Biochem 1970; 48:1104-12. [PMID: 4320080 DOI: 10.1139/o70-174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Experimental conditions have been established for selective measurement of the synthesis of mRNA in mouse embryo cells. Using such conditions, it was found that productive infection of these cells by polyoma virus resulted in stimulation of mRNA synthesis. The pattern of induction of mRNA synthesis was biphasic, characterized by distinct "early" and "late" periods, as denoted by the time of initiation of progeny viral DNA replication. The formation of "early" mRNA was first detected at 9–11 h postinfection, 6 h prior to the time of onset of virus-induced synthesis of cell DNA and 9 h prior to initiation of polyoma DNA replication. The initiation of synthesis of "late" mRNA was approximately coincident with the onset of formation of viral DNA. Most of the newly synthesized "early" and "late" mRNA was of relatively small size (8–12 S) and was associated with polyribosomes which sedimented at less than 180 S. The proportion of the total "late" mRNA which was virus-specific was three times higher than that of the total "early" mRNA; however, the mRNA synthesized both "early" and "late" was predominantly cell-specific.
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Abstract
It has been demonstrated that a glucosamine-containing macromolecular component of the cell surface of 3T3 mouse cells, and SV40-transformed cells, is released from cells by treatment with trypsin under conditions in which the plasma membrane remains functionally intact. This was shown by the fact that the treated cells could be cloned with high plating efficiency and remained impermeable to the vital stain, erythrocin. A method for specifically marking this surface component has been devised based on the finding that in 3T3 cells growing synchronously after subculture by trypsin maximum incorporation of glucosamine into this material occurs 12-13 h thereafter. Of the total radioactive glucosamine incorporated into macro-molecular cell constituents, over 80% was recovered in surface component.
Studies on the biosynthesis of surface component revealed that this was periodic during a cycle of cell duplication, with an increased rate of formation immediately after cell division. It was found that the surface component of 3T3 cells differed from that of SV40-transformed cells.
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Sheinin R, Onodera K. Studies on the biochemical properties of surface component of normal and SV-40 transformed 3T3 mouse cells. Can J Biochem 1970; 48:851-7. [PMID: 4318117 DOI: 10.1139/o70-134] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A specifically marked surface component from 3T3 mouse cells and from SV-40 transformed 3T3 cells has been isolated and partially purified. These components have been shown to be free of RNA, DNA, and lipid. They do contain carbohydrate and peptide, probably as glycoprotein.
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Cheevers WP, Sheinin R. Selective measurement of the synthesis and metabolic stability of messenger RNA in 3T3 mouse cells. Biochim Biophys Acta 1970; 204:449-61. [PMID: 5462410 DOI: 10.1016/0005-2787(70)90165-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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