Abstract：
:Skeletal and cardiac muscle depend on high turnover of ATP made by mitochondria in order to contract efficiently. The transcriptional coactivator PGC-1alpha has been shown to function as a major regulator of mitochondrial biogenesis and respiration in both skeletal and cardiac muscle, but this has been based only on gain-of-function studies. Using genetic knockout mice, we show here that, while PGC-1alpha KO mice appear to retain normal mitochondrial volume in both muscle beds, expression of genes of oxidative phosphorylation is markedly blunted. Hearts from these mice have reduced mitochondrial enzymatic activities and decreased levels of ATP. Importantly, isolated hearts lacking PGC-1alpha have a diminished ability to increase work output in response to chemical or electrical stimulation. As mice lacking PGC-1alpha age, cardiac dysfunction becomes evident in vivo. These data indicate that PGC-1alpha is vital for the heart to meet increased demands for ATP and work in response to physiological stimuli.
journal_name
Cell Metabjournal_title
Cell metabolismauthors
Arany Z,He H,Lin J,Hoyer K,Handschin C,Toka O,Ahmad F,Matsui T,Chin S,Wu PH,Rybkin II,Shelton JM,Manieri M,Cinti S,Schoen FJ,Bassel-Duby R,Rosenzweig A,Ingwall JS,Spiegelman BMdoi
10.1016/j.cmet.2005.03.002keywords:
subject
Has Abstractpub_date
2005-04-01 00:00:00pages
259-71issue
4eissn
1550-4131issn
1932-7420pii
S1550-4131(05)00081-1journal_volume
1pub_type
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