Niacin stimulates adiponectin secretion through the GPR109A receptor

American Journal of Physiology. Endocrinology and Metabolism
Eric P PlaisanceRobert L Judd

Abstract

Niacin (nicotinic acid) has recently been shown to increase serum adiponectin concentrations in men with the metabolic syndrome. However, little is known about the mechanism(s) by which niacin regulates the intracellular trafficking and secretion of adiponectin. Since niacin appears to exert its effects on lipolysis through receptor (GPR109A)-dependent and -independent pathways, the purpose of this investigation was to examine the role of the recently identified GPR109A receptor in adiponectin secretion. Initial in vivo studies in rats demonstrated that niacin (30 mg/kg po) acutely increases serum adiponectin concentrations, whereas it decreases NEFAs. Further in vitro studies demonstrated an increase in adiponectin secretion and a decrease in lipolysis in primary adipocytes following treatment with niacin or beta-hydroxybutyrate (an endogenous ligand of the GPR109A receptor), but these effects were blocked when adipocytes were pretreated with pertussis toxin. Niacin had no effect on adiponectin secretion or lipolysis in 3T3-L1 adipocytes, which have limited cell surface expression of the GPR109A receptor. To further substantiate these in vitro findings, wild-type and GPR109A receptor knockout mice were administered a single do...Continue Reading

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