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- W2029958630 abstract "The central melanocortin (MC) pathway is suggested to mediate satiety signaling downstream of serotonin (5-HT)2C receptors. 5-HT2C receptor mutant mice consume more food, which leads to late-onset obesity and impaired glucose tolerance. Ay mice with ectopic expression of the agouti peptide, which leads to a perturbation of the central MC pathway, develop obesity and diabetes, associated with low levels of plasma total ghrelin. Here, we report that 5-wk-old Ay mice consumed more food in association with decreases in levels of plasma des-acyl ghrelin, but not active ghrelin, and increases in hypothalamic 5-HT2C and 5-HT1B receptor gene expression compared with wild-type mice matched for age and body weight. These alterations were also observed in 8-wk-old obese Ay mice. Restricted feeding significantly decreased hypothalamic 5-HT2C and 5-HT1B receptor gene expression in association with a reversal of the decreases in plasma des-acyl ghrelin levels in 5-wk-old Ay mice. Moreover, restricted feeding reduced body weight, hyperinsulinemia, and hyperglycemia in association with increases in plasma des-acyl ghrelin levels in 8-wk-old obese Ay mice. Administration of m-chlorophenylpiperazine and fenfluramine, both of which induce anorexic effects via 5-HT2C receptors and/or 5-HT1B receptors, suppressed food intake in 5- and 8-wk-old Ay mice, whereas the anorexic effects were attenuated in food-restricted Ay mice. These findings suggest that the agouti peptide down-regulates hypothalamic 5-HT2C and 5-HT1B receptor gene expression under restricted feeding conditions, whereas chronic hyperphagia increases the expression of these genes and decreases plasma des-acyl ghrelin levels in Ay mice." @default.
- W2029958630 created "2016-06-24" @default.
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- W2029958630 date "2006-12-01" @default.
- W2029958630 modified "2023-10-04" @default.
- W2029958630 title "Hyperphagia Alters Expression of Hypothalamic 5-HT2C and 5-HT1B Receptor Genes and Plasma Des-Acyl Ghrelin Levels in A<sup>y</sup>Mice" @default.
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- W2029958630 doi "https://doi.org/10.1210/en.2006-0418" @default.
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