Role of peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) in denervation-induced atrophy in aged muscle: facts and hypotheses

Longevity & Healthspan

Russell T Hepple¹  Yan Burelle⁴  Richard Godin⁴  Martin Picard²  Gilles Gouspillou³ 

[1] Department of Medicine, McGill University, Royal Victoria Hospital, Montreal, QC, Canada;Center for Mitochondrial and Epigenomic Medicine − CMEM, Children's Hospital of Philadelphia, University of Pennsylvania, Colket Translational Research Center, 3501 Civic Center Blvd, Room 6100, Philadelphia, PA 19104, USA;Université du Québec À Montréal (UQÀM), Faculté des sciences Pavillon des sciences biologiques (SB), Local: SB-4640 141, Avenue du Président Kennedy, Montréal, Québec H2X 1Y4, Canada;Faculty of Pharmacy, Université de Montréal, 2940, Chemin de la polytechnique, Montreal, QC H3C 3J7, Canada

关键词: Reinnervation;    Denervation;    PGC-1α;    Sarcopenia;    Aging;    Skeletal muscle;   

Others  :  803743
DOI  :  10.1186/2046-2395-2-13

 received in 2013-03-08, accepted in 2013-06-19,  发布年份 2013

【 摘 要 】

Aging-related loss of muscle mass, a biological process named sarcopenia, contributes to mobility impairment, falls, and physical frailty, resulting in an impaired quality of life in older people. In view of the aging of our society, understanding the underlying mechanisms of sarcopenia is a major health-care imperative. Evidence obtained from human and rodent studies demonstrates that skeletal muscle denervation/reinnervation cycles occur with aging, and that progressive failure of myofiber reinnervation is a major cause of the accelerating phase of sarcopenia in advanced age. However, the mechanisms responsible for the loss of myofiber innervation with aging remain unknown. The two major strategies that counteract sarcopenia, that is, caloric restriction and endurance training, are well known to protect neuromuscular junction (NMJ) integrity, albeit through undefined mechanisms. Interestingly, both of these interventions better preserve PGC-1α expression with aging, a transcriptional coactivator which has recently been shown to regulate key proteins involved in maintaining NMJ integrity. We therefore propose that the aging-related decline in PGC-1α may be a central mechanism promoting instability of the NMJ and consequently, aging-related alterations of myofiber innervation in sarcopenia. Similarly, the promotion of PGC-1α expression by both caloric restriction and exercise training may be fundamental to their protective benefits for aging muscle by better preserving NMJ integrity.

【 授权许可】

   
2013 Gouspillou et al.; licensee BioMed Central Ltd.

【 图 表 】

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