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Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses

In chick-embryo fibroblasts infected with the Schmidt-Ruppin strain of Rous sarcoma virus, subgroup A (wild type), or with a thermosensitive mutant of this virus, T5, the rates of mitochondrial DNA synthesis differ in cells that exhibit normal and malignant phenotypes. In wild type virus-infected ce...

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Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1976
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2109783/
https://www.ncbi.nlm.nih.gov/pubmed/186463
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collection PubMed
description In chick-embryo fibroblasts infected with the Schmidt-Ruppin strain of Rous sarcoma virus, subgroup A (wild type), or with a thermosensitive mutant of this virus, T5, the rates of mitochondrial DNA synthesis differ in cells that exhibit normal and malignant phenotypes. In wild type virus-infected cells grown at 36 or 41 degrees C, morphological transformation is expressed, the rate of 2-deoxy-D-[3H]glucose uptake is stimulated, and mitochondrial DNA synthesis in vivo is stimulated three- to fivefold over that in uninfected cells. In T5-infected cells these changes occur only at the permissive temperature (36 degrees C); a shift to the nonpermissive temperature (41 degrees C) causes the reversal of these effects, and the specific activity of purified mitochondrial DNA is characteristic of that from uninfected cells. In contrast, the specific activities of nuclear DNA purified from cells maximally transformed under the permissive conditions do not differ between wild type-infected and uninfected with the T5 virus. In parallel experiments with isolated mitochondria, the rate of mtDNA synthesis in vitro is again greater in mitochondria isolated from transformed cells. In addition, mitochondrial DNA synthesis in vitro in mitochondria from nontransformed and virus-transformed cells exhibits differential sensitivity to inhibition by mercaptoethanol. Furthermore, the ntDNAP polymerase activity in mitochondrial extracts prepared from cells with transformed phenotypes is about sevenfold higher than in extracts from cells with nontransformed phenotypes.
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spelling pubmed-21097832008-05-01 Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses J Cell Biol Articles In chick-embryo fibroblasts infected with the Schmidt-Ruppin strain of Rous sarcoma virus, subgroup A (wild type), or with a thermosensitive mutant of this virus, T5, the rates of mitochondrial DNA synthesis differ in cells that exhibit normal and malignant phenotypes. In wild type virus-infected cells grown at 36 or 41 degrees C, morphological transformation is expressed, the rate of 2-deoxy-D-[3H]glucose uptake is stimulated, and mitochondrial DNA synthesis in vivo is stimulated three- to fivefold over that in uninfected cells. In T5-infected cells these changes occur only at the permissive temperature (36 degrees C); a shift to the nonpermissive temperature (41 degrees C) causes the reversal of these effects, and the specific activity of purified mitochondrial DNA is characteristic of that from uninfected cells. In contrast, the specific activities of nuclear DNA purified from cells maximally transformed under the permissive conditions do not differ between wild type-infected and uninfected with the T5 virus. In parallel experiments with isolated mitochondria, the rate of mtDNA synthesis in vitro is again greater in mitochondria isolated from transformed cells. In addition, mitochondrial DNA synthesis in vitro in mitochondria from nontransformed and virus-transformed cells exhibits differential sensitivity to inhibition by mercaptoethanol. Furthermore, the ntDNAP polymerase activity in mitochondrial extracts prepared from cells with transformed phenotypes is about sevenfold higher than in extracts from cells with nontransformed phenotypes. The Rockefeller University Press 1976-12-01 /pmc/articles/PMC2109783/ /pubmed/186463 Text en This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Articles
Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title_full Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title_fullStr Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title_full_unstemmed Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title_short Specific changes in the synthesis of mitochondrial DNA in chick embryo fibroblasts transformed by Rous sarcoma viruses
title_sort specific changes in the synthesis of mitochondrial dna in chick embryo fibroblasts transformed by rous sarcoma viruses
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2109783/
https://www.ncbi.nlm.nih.gov/pubmed/186463