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|Title:||AMPK and ACC phosphorylation: Effect of leptin, muscle fibre type and obesity|
|Citation:||Molecular and Cellular Endocrinology, 2008; 284(1-2):1-10|
|Publisher:||Elsevier Sci Ireland Ltd|
|A. Janovská, G. Hatzinikolas, V. Staikopoulos, J. McInerney, M. Mano and 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 AMPKα and ACCβ 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 AMPKα and ACCβ (P ≤ 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 ≤ 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 AMPKα and ACCβ is muscle fibre type dependent and fails in diet-induced obesity.|
|Keywords:||Leptin; AMPK; Obesity; LCFA-CoA; ACC; Skeletal muscle|
|Description:||Crown copyright © 2008 Published by Elsevier Ireland Ltd.|
|Appears in Collections:||Medicine publications|
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