title: Increased muscle PGC-1alpha expression protects from sarcopenia and metabolic disease during aging.
abstract: Aging is a major risk factor for metabolic disease and loss of skeletal muscle mass and strength, a condition known as sarcopenia. Both conditions present a major health burden to the elderly population. Here, we analyzed the effect of mildly increased PGC-1alpha expression in skeletal muscle during aging. We found that transgenic MCK-PGC-1alpha animals had preserved mitochondrial function, neuromuscular junctions, and muscle integrity during aging. Increased PGC-1alpha levels in skeletal muscle prevented muscle wasting by reducing apoptosis, autophagy, and proteasome degradation. The preservation of muscle integrity and function in MCK-PGC-1alpha animals resulted in significantly improved whole-body health; both the loss of bone mineral density and the increase of systemic chronic inflammation, observed during normal aging, were prevented. Importantly, MCK-PGC-1alpha animals also showed improved metabolic responses as evident by increased insulin sensitivity and insulin signaling in aged mice. Our results highlight the importance of intact muscle function and metabolism for whole-body homeostasis and indicate that modulation of PGC-1alpha levels in skeletal muscle presents an avenue for the prevention and treatment of a group of age-related disorders.
authors.affiliation: Department of Neurology, University of Miami School of Medicine, Miami, FL33136, USA.
authors.forename: Tina
authors.initials: T
authors.lastname: Wenz
authors.forename: Susana G
authors.initials: SG
authors.lastname: Rossi
authors.forename: Richard L
authors.initials: RL
authors.lastname: Rotundo
authors.forename: Bruce M
authors.initials: BM
authors.lastname: Spiegelman
authors.forename: Carlos T
authors.initials: CT
authors.lastname: Moraes
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001823:Body Composition / Q000502:physiology; D001824:Body Constitution / Q000502:physiology; D001835:Body Weight; D008659:Metabolic Diseases / Q000378:metabolism / Q000517:prevention & control*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D008928:Mitochondria / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism* / Q000502:physiology; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D055948:Sarcopenia / Q000378:metabolism / Q000517:prevention & control*; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors
chemical_list: D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; C485290:Ppargc1a protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors