期刊
AMERICAN JOURNAL OF PATHOLOGY
卷 169, 期 4, 页码 1129-1139出版社
ELSEVIER SCIENCE INC
DOI: 10.2353/ajpath.2006.060034
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Peroxisome proliferator-activated receptor-gamma co-activator-1 alpha (PGC-1 alpha) is a key nuclear receptor co-activator for mitochondrial biogenesis. Here we report that overexpression of PGC-1 alpha in skeletal muscles increased mitochondrial number and caused atrophy of skeletal muscle, especially type 2B fiber-rich muscles (gastrocnemius, quadriceps, and plantaris). Muscle atrophy became evident at 25 weeks of age, and a portion of the muscle was replaced by adipocytes. Mice showed increased energy expenditure and reduced body weight; thyroid hormone levels were normal. Mitochondria exhibited normal respiratory chain activity per mitochondrion; however, mitochondrial respiration was not inhibited by an ATP synthase inhibitor, oligomycin, clearly indicating that oxidative phosphorylation was uncoupled. Accordingly, ATP content in gastrocnemius was markedly reduced. A similar phenotype is observed in Luft's disease, a mitochondrial disorder that involves increased uncoupling of respiration and muscle atrophy. Our results indicate that overexpression of PGC-1 alpha in skeletal muscle increases not only mitochondrial biogenesis but also uncoupling of respiration, resulting in muscle atrophy.
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