ACTH and alpha-MSH inhibit leptin expression and secretion in 3T3-L1 adipocytes: model for a central-peripheral melanocortin-leptin pathway.
Leptin is the 167 amino-acid protein product of the Lep (obese) gene that is released predominantly from adipose tissue and circulates at levels related to the amount of fat. Leptin expression is hormonally regulated: insulin and glucocorticoids are stimulators, while inhibitors include beta-adrenergic agonists and testosterone. Recently, adenylate cyclase-coupled melanocortin receptors have been identified in murine adipose tissue, the 3T3-L1 adipocyte cell line, and in human fat tissue. The...Expand abstract
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