| Literature DB >> 18255222 |
A Janovská1, G Hatzinikolas, V Staikopoulos, J McInerney, M Mano, G A Wittert.
Abstract
Leptin stimulates fatty acid oxidation via the phosphorylation of AMPK (AMP-activated protein kinase) and ACC (acetyl-CoA carboxylase). Obesity is associated with resistance to the effects of leptin. We determined the action of leptin on AMPKalpha and ACCbeta phosphorylation and lipid metabolism in soleus (SOL) and extensor digitorum longus (EDL) muscles from lean and obese Wistar rats after 1 and 100 nM leptin. Both leptin doses stimulated phosphorylation of AMPKalpha and ACCbeta (P<or=0.05) only in EDL muscles from lean animals. Malonyl-CoA levels were decreased in EDL muscles from lean animals after 1 and 100 nM leptin and significantly after 100 nM leptin in obese animals (P<or=0.05). Long-chain fatty acyl-CoA concentrations were decreased in EDL muscles from both phenotypes after 100 nM leptin. AMPK activation by leptin occurred independently of energy-related metabolites. These data demonstrate that the leptin effect on AMPKalpha and ACCbeta is muscle fibre type dependent and fails in diet-induced obesity.Entities:
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Year: 2008 PMID： 18255222 DOI： 10.1016/j.mce.2007.12.013
Source DB: PubMed Journal: Mol Cell Endocrinol ISSN： 0303-7207 Impact factor: 4.102