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Acute orexin effects on insulin secretion in the rat: in vivo and in vitro studies.

机译:急性食欲素对大鼠胰岛素分泌的影响:体内和体外研究。

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摘要

Orexin-A and orexin-B are members of a family of newly described orexigenic hypothalamic neuropeptides. Scanty data are available suggesting the involvement of orexins in regulation of the secretion of pituitary hormones and in control of energy homeostasis. Present studies aimed to explain whether orexins affect blood insulin concentration and insulin secretion in the rat. To check this possibility, adult female rats were subcutaneously injected with different doses (1 or 2 nmol) of orexin-A or orexin-B. A bolus administration of orexin-A resulted in an increase in blood insulin (up to min 120) and glucose (60 min after injection) concentration. The higher dose of orexin-B, on the other hand, exerted effect on insulin secretion only at min 60 of experiment and neither doses changed blood glucose level. Only orexin-A stimulated insulin secretion in an in vitro perfusion system of the rat pancreas preparation, while orexin-B was less effective. The results demonstrate that orexins belong to a group of neuropeptides influencing insulin secretion and acting directly on the pancreas. Direct, at least partial, effect of orexin on insulin secretion may be connected with the regulation of metabolism by this peptide.
机译:Orexin-A和orexin-B是新近描述的食源性下丘脑神经肽家族的成员。很少的数据表明,orexins参与调节垂体激素的分泌和控制能量稳态。目前的研究旨在解释食欲素是否会影响大鼠的血胰岛素浓度和胰岛素分泌。为了检查这种可能性,成年雌性大鼠皮下注射了不同剂量(1或2 nmol)的orexin-A或orexin-B。大剂量施用orexin-A导致血液胰岛素(最高120分钟)和葡萄糖(注射后60分钟)浓度增加。另一方面,高剂量的orexin-B仅在实验的第60分钟对胰岛素分泌产生作用,并且没有一个剂量改变血糖水平。在大鼠胰腺制剂的体外灌注系统中,只有orexin-A刺激胰岛素分泌,而orexin-B效果较差。结果表明,orexins属于一组影响胰岛素分泌并直接作用于胰腺的神经肽。食欲素对胰岛素分泌的直接的,至少部分的作用可能与该肽的代谢调节有关。

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