首页> 外文期刊>Pharmacology, Biochemistry and Behavior >GABAergic agents prevent alpha-melanocyte stimulating hormone induced anxiety and anorexia in rats.
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GABAergic agents prevent alpha-melanocyte stimulating hormone induced anxiety and anorexia in rats.

机译:GABA激动剂可防止刺激大鼠的黑素细胞刺激激素引起的焦虑和厌食。

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摘要

Alpha-melanocyte stimulating hormone (alpha-MSH) is a hypothalamic peptide believed to play a tonic inhibitory role in feeding and energy homeostasis. Systemic administration of alpha-MSH is known to produce anorexia and anxiety. Since synaptic contacts between gamma-aminobutyric acid (GABA)ergic terminals and alpha-MSH neurons in the hypothalamus have been reported, the present work was undertaken to refine our knowledge on the role of GABAergic systems in anxiety and anorexia induced by intracerebroventricular (icv) administration of alpha-MSH in rats. The anxiety was assessed by elevated plus maze, and spontaneous food consumption was monitored during dark cycle. Prior administration of diazepam and muscimol that promote the function of GABA(A) receptors reversed the anxiogenic response and decreased food intake elicited by alpha-MSH. In contrast, bicuculline, the GABA(A) receptor antagonist, not only enhanced the effects of alpha-MSH but also prevented the influence of GABAergic drugs on alpha-MSH-induced anorexia and anxiety. These findings suggest that alpha-MSH-induced anxiety and anorexia are due to its negative influence on GABAergic system.
机译:α-黑素细胞刺激激素(alpha-MSH)是一种下丘脑肽,据信在进食和能量稳态中起着强壮的抑制作用。众所周知,α-MSH的全身给药会引起厌食和焦虑。由于已经报道了下丘脑中γ-氨基丁酸(GABA)能量末端和α-MSH神经元之间的突触接触,因此本工作旨在完善我们对GABA能量系统在脑室内(icv)诱发的焦虑和厌食中的作用的认识。在大鼠中使用alpha-MSH。通过高架迷宫评估焦虑,并在黑暗周期中监控自发食物的摄入量。事先服用会促进GABA(A)受体功能的地西epa和麝香酚逆转了焦虑反应,并减少了α-MSH引起的食物摄入。相反,双瓜氨酸,即GABA(A)受体拮抗剂,不仅增强了α-MSH的作用,而且还阻止了GABA能药物对α-MSH引起的厌食和焦虑的影响。这些发现表明,α-MSH引起的焦虑和厌食是由于其对GABA能系统的负面影响。

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