Increased mitochondrial biogenesis in muscle improves aging phenotypes in the mtDNA mutator mouse

Lloye M. Dillon, Siôn L. Williams, Aline Hida, Jacqueline D. Peacock, Tomas A. Prolla, Joy Lincoln, Carlos T. Moraes

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

Aging is an intricate process that increases susceptibility to sarcopenia and cardiovascular diseases. The accumulation of mitochondrial DNA (mtDNA) mutations is believed to contribute to mitochondrial dysfunction, potentially shortening lifespan. The mtDNA mutator mouse, a mouse model with a proofreading-deficient mtDNA polymerase γ, was shown to develop a premature aging phenotype, including sarcopenia, cardiomyopathy and decreased lifespan. This phenotype was associated with an accumulation of mtDNA mutations and mitochondrial dysfunction. We found that increased expression of peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), a crucial regulator of mitochondrial biogenesis and function, in the muscle of mutator mice increased mitochondrial biogenesis and function and also improved the skeletal muscle and heart phenotypes of the mice. Deep sequencing analysis of their mtDNA showed that the increased mitochondrial biogenesis did not reduce the accumulation of mtDNA mutations but rather caused a small increase. These results indicate that increased muscle PGC-1α expression is able to improve some premature aging phenotypes in the mutator mice without reverting the accumulation of mtDNA mutations.

Original languageEnglish (US)
Article numberdds049
Pages (from-to)2288-2297
Number of pages10
JournalHuman molecular genetics
Volume21
Issue number10
DOIs
StatePublished - May 2012

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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