Regulation of food intake and energy expenditure by hypothalamic malonyl-CoA

International Journal of Obesity : Journal of the International Association for the Study of Obesity
M Daniel LaneYun Dai

Abstract

Energy balance is monitored by the hypothalamus. Malonyl-CoA, an intermediate in fatty acid synthesis, serves as an indicator of energy status in the hypothalamic neurons. The cellular malonyl-CoA level is determined by its rate of synthesis, catalyzed by acetyl-CoA carboxylase (ACC), and rate of removal, by fatty acid synthase (FAS). Malonyl-CoA functions in the hypothalamic neurons that express orexigenic and anorexigenic neuropeptides. Inhibitors of FAS, administered systemically or intracerebroventricularly to mice, increase hypothalamic malony-CoA and suppress food intake. Recent evidence suggests that the changes of hypothalamic malonyl-CoA during feeding and fasting cycles are caused by changes in the phosphorylation state and activity of ACC mediated via 5'-AMP-activated protein kinase (AMPK). Stereotactic delivery of a viral malonyl-CoA decarboxylase (MCD) vector into the ventral hypothalamus lowers malonyl-CoA and increases food intake. Fasting decreases hypothalamic malonyl-CoA and refeeding increases hypothalamic malonyl-CoA, to alter feeding behavior in the predicted manner. Malonyl-CoA level is under the control of AMP kinase which phosphorylates/inactivates ACC. Malonyl-CoA is an inhibitor of carnitine palmitoyl-...Continue Reading

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Citations

Aug 8, 2012·Cellular and Molecular Life Sciences : CMLS·Liang Tong
Aug 18, 2010·International Journal of Obesity : Journal of the International Association for the Study of Obesity·D R SchwinkendorfD G Mashek
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