Central nervous system action of thyrotropin-releasing hormone to increase gastric mucosal blood flow in the rat.

Central nervous system action of thyrotropin-releasing hormone to increase gastric mucosal blood flow in the rat.
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促甲状腺激素释放激素增加大鼠胃粘膜血流量的中枢神经系统作用。

DOI:
10.1016/0016-5085(89)90076-0
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发表时间:
1989
期刊:
影响因子:
29.4
通讯作者:
Guth,PH
Guth,PH
中科院分区:
医学1区
文献类型:
--
作者:
Thiefin,G;Taché,Y;Leung,FW;Guth,PH

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本文研究了促甲状腺激素释放激素(TRH)对大鼠胃酸分泌和胃粘膜血流量的中枢作用。通过氢气清除技术和连续胃灌注法在禁食、麻醉大鼠中测量体粘膜血流量和酸排出量。侧脑室注射促甲状腺激素释放激素(1或5 μg)可引起胃酸分泌和粘膜血流量的增加。静脉滴注阶梯剂量TRH(60和180 μg/kg · h)对上述参数无影响。切断双侧迷走神经和阿托品(0.15mg/kg)可完全阻断侧脑室注射TRH(5 μg)对胃酸分泌和粘膜血流量的影响。相反,静脉注射奥美拉唑(20 μmol/kg)完全抑制胃酸分泌的增加,但不能抑制侧脑室注射TRH(5 μg)引起的粘膜血流量增加。这些结果表明,TRH在脑中通过迷走神经依赖性途径和外周毒蕈碱受体刺激胃酸分泌和粘膜血流。中枢TRH对胃粘膜血流量的部分作用并不继发于酸分泌的刺激,而是表现为直接的胆碱能血管舒张反应。
The central nervous system effects of thyrotropin-releasing hormone (TRH) on gastric acid secretion and mucosal blood flow were studied in rats. Corpus mucosal blood flow was measured by the hydrogen gas clearance technique and acid output by a continuous gastric perfusion method in fasted, urethane-anesthetized rats. Thyrotropin-releasing hormone (1 or 5 μg) injected into the cerebral lateral ventricle induced concomitant increases in gastric acid secretion and mucosal blood flow. Intravenous infusion of step doses of TRH (60 and 180 μg/kg · h) had no effect on these parameters. Bilateral vagotomy and atropine (0.15 mg/kg) completely blocked the effects of intracerebroventricular injection of TRH (5 μg) on gastric acid secretion and mucosal blood flow. In contrast, intravenous omeprazole (20 μmol/kg) completely inhibited the increase in gastric acid secretion but not the increase in mucosal blood flow elicited by intracerebroventricular administration of TRH (5 μg). These results demonstrate that TRH acts in the brain to stimulate gastric acid secretion and mucosal blood flow through vagal dependent pathways and peripheral muscarinic receptors. Part of the effect of central TRH on gastric mucosal blood flow is not secondary to the stimulation of acid secretion and appears to represent a direct cholinergic vasodilatory response.
p-Glu-His-(3,3-二甲基)-Pro NH2(TRH 的稳定类似物)对刺激大鼠胃分泌的有效中枢神经系统作用
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