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Metformin demonstrates anorectic effects in vivo and inhibits neuropeptide Y expression in cultured hypothalamic neurons. Here we investigated the mechanisms implicated in the modulation of feeding by metformin in animals rendered obese by long-term high-fat diet (diet-induced obesity [DIO]) and in animals resistant to obesity (diet resistant [DR]). Male Long-Evans rats were kept on normal chow feeding...
It has been proposed that ghrelin induces food intake by a mechanism due to the stimulation of hypothalamic NPY-ergic activity. It is recognized that bilateral adrenalectomy (ADX) enhances hypothalamic CRH-ergic function and reduces appetite. Thus, the aim of the present study was to test whether, icv-administered, ghrelin modulates NPY- and CRH-ergic functions after food restriction (FR) and glucocorticoid...
Pubertal development results from the coordinate secretion of gonadotropin-releasing hormone (GnRH) by hypothalamic GnRH neurons. Central administration of neuropeptide Y (NPY) to prepubertal rats can indefinitely delay sexual maturation by inhibiting this GnRH secretion. The aim of the present study was to further investigate the physiological role of NPY in pubertal development, and to assess the...
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