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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Sequential changes in the signal transduction responses of skeletal muscle following food deprivation.

Coping with reduced energy sources entails drastic morphological and functional changes in skeletal muscle, but the sequence of events required classification. We found that gastrocnemius muscle from food-deprived rats shows acute rises in peroxisome proliferator activated receptor (PPAR) gamma coactivator (PGC) -1alpha/PPAR delta nuclear protein and myosin heavy chain (MHC) Ib protein, while type I fibers accumulate and the muscle tissue appears redder. AMP levels, phosphorylation of both AMP-activated protein kinase ( AMPK) and its downstream target acetyl coenzyme A carboxylase (ACC) are induced within 6 h. Rapidly increased MyoD mRNA levels are followed by an increase in uncoupling protein (UCP) 3 (UCP3) transcription. Increased serum fatty acid levels coincide with increases in mitochondrial UCP3 protein levels and fatty acid oxidation. Accompanying this is a decrease in AMPK phosphorylation, reversible upon nicotinic acid treatment, indicating that fatty acids may modulate this kinase's activity after the metabolic challenges posed by food deprivation.[1]

References

  1. Sequential changes in the signal transduction responses of skeletal muscle following food deprivation. de Lange, P., Farina, P., Moreno, M., Ragni, M., Lombardi, A., Silvestri, E., Burrone, L., Lanni, A., Goglia, F. FASEB J. (2006) [Pubmed]
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