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Mitochondrial fission and fusion mediators, hFis1 and OPA1, modulate cellular senescence.

Authors
Lee, S; Jeong, SY; Lim, WC; Kim, S; Park, YY; Sun, X; Youle, RJ; Cho, H
Citation
The Journal of biological chemistry, 282(31):22977-22983, 2007
Journal Title
The Journal of biological chemistry
ISSN
0021-92581083-351X
Abstract
The number and morphology of mitochondria within a cell are precisely regulated by the mitochondrial fission and fusion machinery. The human protein, hFis1, participates in mitochondrial fission by recruiting the Drp1 into the mitochondria. Using short hairpin RNA, we reduced the expression levels of hFis1 in mammalian cells. Cells lacking hFis1 showed sustained elongation of mitochondria and underwent significant cellular morphological changes, including enlargement, flattening, and increased cellular granularity. In these cells, staining for acidic senescence-associated beta-galactosidase activity was elevated, and the rate of cell proliferation was greatly reduced, indicating that cells lacking hFis1 undergo senescence-associated phenotypic changes. Reintroduction of the hFis1 gene into hFis1-depleted cells restored mitochondrial fragmentation and suppressed senescence-associated beta-galactosidase activity. Moreover, depletion of both hFis1 and OPA1, a critical component of mitochondrial fusion, resulted in extensive mitochondrial fragmentation and markedly rescued cells from senescence-associated phenotypic changes. Intriguingly, sustained elongation of mitochondria was associated with decreased mitochondrial membrane potential, increased reactive oxygen species production, and DNA damage. The data indicate that sustained mitochondrial elongation induces senescence-associated phenotypic changes that can be neutralized by mitochondrial fragmentation. Thus, one of the key functions of mitochondrial fission might be prevention of the sustained extensive mitochondrial elongation that triggers cellular senescence.
MeSH terms
Cell Aging*Cell ProliferationDNA DamageDNA FragmentationGTP Phosphohydrolases/physiology*Gene SilencingHela CellsHumansMembrane ProteinsMitochondriaMitochondrial Proteins/physiology*Models, BiologicalPhenotypeRNA InterferenceReactive Oxygen SpeciesTime Factors
DOI
10.1074/jbc.M700679200
PMID
17545159
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Biochemistry & Molecular Biology
Journal Papers > School of Medicine / Graduate School of Medicine > Medical Genetics
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