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Noradrenergic inhibition of canine gallbladder contraction and murine pancreatic secretion during stress by corticotropin-releasing factor.

机译:促肾上腺皮质激素释放因子对大鼠胆囊收缩和鼠胰腺分泌的去甲肾上腺素能抑制作用。

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摘要

Gastrointestinal secretory and motor responses are profoundly altered during stress; but the effects of stress and its mediator(s) on the two major gut functions, exocrine pancreatic secretion and gallbladder motility, are unknown. We therefore developed two animal models that allowed us to examine the effects of acoustic stress on canine gallbladder contraction and restraint stress on rat exocrine pancreatic secretion. Acoustic stress inhibited cholecystokinin-8 (CCK)- and meal-induced gallbladder contraction, and restraint stress inhibited basal and CCK/secretin-stimulated pancreatic secretion. These inhibitory responses were mimicked by cerebral injection of corticotropin-releasing factor (CRF) and abolished by the CRF antagonist, alpha-helical CRF-(9-41). The effects of stress and exogenous CRF were simulated by intravenous infusion of norepinephrine but prevented by ganglionic, noradrenergic, and alpha-adrenergic but not beta-adrenergic receptor blockade. Vagotomy, adrenalectomy, and--in rats--hypophysectomy did not alter the effects produced by stress and CRF. These results indicate that endogenous CRF released in response to different stressors in distinct species inhibits canine gallbladder contraction and murine exocrine pancreatic secretion via activation of sympathetic efferents. Release of norepinephrine appears to be the final common pathway producing inhibition of biliary and pancreatic digestive function during stress mediated by cerebral CRF.
机译:在压力下,胃肠道的分泌和运动反应发生了深刻的变化。但是,压力及其介体对两种主要肠道功能(外分泌胰腺分泌和胆囊运动性)的影响尚不清楚。因此,我们开发了两个动物模型,使我们能够研究声压对犬胆囊收缩的影响以及对大鼠外分泌胰腺分泌的约束性应激。声学应激抑制胆囊收缩素8(CCK)和餐引起的胆囊收缩,而抑制应激抑制基础和CCK /分泌素刺激的胰腺分泌。这些抑制性反应通过脑内注射促肾上腺皮质激素释放因子(CRF)得以模仿,而被CRF拮抗剂α-螺旋CRF-(9-41)消除。通过静脉注射去甲肾上腺素可模拟压力和外源性CRF的作用,但可通过神经节,去甲肾上腺素和α-肾上腺素阻止,但不能通过β-肾上腺素受体阻断来预防。迷走神经切断术,肾上腺切除术以及大鼠的垂体切除术并没有改变压力和CRF所产生的影响。这些结果表明,在不同物种中对不同应激源的响应而释放的内源性CRF通过激活交感神经来抑制犬胆囊收缩和鼠外分泌胰腺分泌。去甲肾上腺素的释放似乎是在脑CRF介导的应激过程中抑制胆汁和胰腺消化功能的最终常见途径。

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