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Type: Artigo de periódico
Title: Effect of chemical stimulation of the dorsomedial hypothalamic nucleus on blood plasma glucose, triglycerides and free fatty acids in rats
Author: Zaia, CTBV
Gaziri, LCJ
Zaia, DAM
Delattre, E
Dolnikoff, MS
TimoIaria, C
Abstract: The effects of chemical stimulation of the dorsomedial hypothalamic nucleus (DMH) on blood plasma concentration of glucose, triglycerides, insulin, and free fatty acids (FFA) were investigated in anesthetized adult Wistar rats. Microinjection of 12.5 nmol of norepinephrine into the DMH increased blood plasma concentration of glucose and FFA, decreased triglycerides, and did not change plasma insulin within 5 min; after 20 min, blood glucose and FFA reached control values. Microinjection of epinephrine (12.5 nmol) into the DMH also increased blood plasma glucose concentration and decreased triglycerides after 5 min. These effects are probably mediated by beta-adrenergic mechanisms, because they were prevented by beta-adrenergic antagonist propranolol, but not by alpha-adrenergic antagonist prazosin. Microinjection into the DMH of glutamate, dopamine, or acetylcholine failed to cause any change in those metabolic parameters, corroborating the hypothesis that the DMH is part of a beta-adrenergic pathway involved in short-term modulation of the availability of glucose and FFA. Copyright (C) 1997 Elsevier Science Inc.
Subject: hypothalamus
adrenergic blockers
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Brain Research Bulletin. Pergamon-elsevier Science Ltd, v. 42, n. 3, n. 195, n. 198, 1997.
Rights: fechado
Identifier DOI: 10.1016/S0361-9230(96)00225-0
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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