Linked Life Data

8223726

Source:http://linkedlifedata.com/resource/pubmed/id/8223726

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pubmed-article:8223726pubmed:abstractTextCultured human muscle cells were depleted of mitochondrial DNA (mtDNA) by prolonged treatment with ethidium bromide (EB). In these respiration-deficient muscle cells neither cytochrome c oxidase activity nor mtDNA were detectable. However, mitochondrial matrix enzymes remained present and were localized in mitochondria-like organelles, as shown by subcellular fractionation. Metabolic labeling showed synthesis of cytochrome c oxidase subunits coded by nuclear DNA (nDNA). These results indicate that depletion of mtDNA in cultured human myoblasts does not inhibit expression of nDNA-coded mitochondrial proteins. The characteristic thread-like pattern of mitochondria was lost in mtDNA-depleted myoblasts, as shown by immunofluorescence with antibodies against cytochrome c oxidase and the F1 part of the mitochondrial ATP synthase (F1-ATPase) and by fluorescence of the carbocyanine dye, 3,3'-dipentyloxacarbocyanine iodide (DiOC5(3)). The organelles visualized by these methods were round and swollen and had a localization different from lysosomes as shown by double-labeling with mitochondrial and lysosomal antibodies. These results indicate that not only synthesis, but also import of mitochondrial proteins into mitochondria-like organelles remains possible in respiration-deficient cells.lld:pubmed
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pubmed-article:8223726pubmed:articleTitleMitochondria in cultured human muscle cells depleted of mitochondrial DNA.lld:pubmed
pubmed-article:8223726pubmed:affiliationDepartment of Neurology, University of Amsterdam, The Netherlands.lld:pubmed
pubmed-article:8223726pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8223726pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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