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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
D-chiro-inositol glycan reduces food intake by regulating hypothalamic neuropeptide expression via AKT-FoxO1 pathway.
Biochemical and Biophysical Research Communications 2016 Februrary 20
The regulation of food intake is important for body energy homeostasis. Hypothalamic insulin signaling decreases food intake by upregulating the expression of anorexigenic neuropeptides and downregulating the expression of orexigenic neuropeptides. INS-2, a Mn(2+) chelate of 4-O-(2-amino-2-deoxy-β-D-galactopyranosyl)-3-O-methyl-D-chiro-inositol, acts as an insulin mimetic and sensitizer. We found that intracerebroventricular injection of INS-2 decreased body weight and food intake in mice. In hypothalamic neuronal cell lines, INS-2 downregulated the expression of neuropeptide Y (NPY), an orexigenic neuropeptide, but upregulated the expression of proopiomelanocortin (POMC), an anorexigenic neuropeptide, via modulation of the AKT-forkhead box-containing protein-O1 (FoxO1) pathway. Pretreatment of these cells with INS-2 enhanced the action of insulin on downstream signaling, leading to a further decrease in NPY expression and increase in POMC expression. These data indicate that INS-2 reduces food intake by regulating the expression of the hypothalamic neuropeptide genes through the AKT-FoxO1 pathway downstream of insulin.
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