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Aging Cell. 2018 Apr;17(2). doi: 10.1111/acel.12707. Epub 2018 Feb 10.

Overexpression of PGC-1α in aging muscle enhances a subset of young-like molecular patterns.

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Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA.
Neuroscience Graduate Program, University of Miami Miller School of Medicine, Miami, FL, USA.
Graduate Program in Environment and Regional Development, University of Western São Paulo, Presidente Prudente, Brazil.
Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, USA.
Institute of Biosciences, São Paulo State University (UNESP), Botucatu, Brazil.


PGC-1α is a transcriptional co-activator known as the master regulator of mitochondrial biogenesis. Its control of metabolism has been suggested to exert critical influence in the aging process. We have aged mice overexpressing PGC-1α in skeletal muscle to determine whether the transcriptional changes reflected a pattern of expression observed in younger muscle. Analyses of muscle proteins showed that Pax7 and several autophagy markers were increased. In general, the steady-state levels of several muscle proteins resembled that of muscle from young mice. Age-related mtDNA deletion levels were not increased by the PGC-1α-associated increase in mitochondrial biogenesis. Accordingly, age-related changes in the neuromuscular junction were minimized by PGC-1α overexpression. RNA-Seq showed that several genes overexpressed in the aged PGC-1α transgenic are expressed at higher levels in young when compared to aged skeletal muscle. As expected, there was increased expression of genes associated with energy metabolism but also of pathways associated with muscle integrity and regeneration. We also found that PGC-1α overexpression had a mild but significant effect on longevity. Taken together, overexpression of PGC-1α in aged muscle led to molecular changes that resemble the patterns observed in skeletal muscle from younger mice.


aging; lifespan; longevity; mitochondria; mouse models; skeletal muscle

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