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Journal Article
Review
Role of hypothalamic AMP-kinase in food intake regulation.
Nutrition 2008 September
Adenosine monophosphate-activated protein kinase (AMPK) functions as a cellular fuel gauge that regulates metabolic pathways in nutrient metabolism. Recent studies have strongly implicated that AMPK in the hypothalamus regulates energy metabolism by integrating inputs from multiple hormones, peptides, neurotransmitters, and nutrients. Leptin is an adipocyte hormone that regulates food intake and energy expenditure in peripheral tissues. Leptin inhibits AMPK activity in the arcuate and paraventricular hypothalamus, and its inhibition is necessary for the anorexic effect of leptin. Alteration of hypothalamic AMPK activity is sufficient to change food intake and body weight. Furthermore, fasting/refeeding, glucose, and melanocortin receptor alter AMPK activity in the hypothalamus. Adiponectin has also been shown to increase food intake by activating AMPK in the arcuate hypothalamus. Recent data have shown that acetyl-coenzyme A carboxylase/malonyl-coenzyme A/carnitine palmitoyltransferase-1/fatty acid oxidation and mammalian target of rapamycin signalings are putative downstream pathways for food intake regulation in response to hypothalamic AMPK. Thus, these results suggest that food intake and nutrient metabolism are coordinately regulated by the common signaling pathway of AMPK in the hypothalamus.
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