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首页> 外文期刊>Pharmacology: International Journal of Experimental and Clinical Pharmacology >Effects of diabetes mellitus on the contractile activity of carbachol and galanin in isolated gastric fundus strips of rats.
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Effects of diabetes mellitus on the contractile activity of carbachol and galanin in isolated gastric fundus strips of rats.

机译:糖尿病对大鼠离体胃底条中卡巴胆碱和甘丙肽收缩活性的影响。

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摘要

The role of the cholinergic and peptidergic pathways in the impairment of gastric motility associated with diabetic gastroparesis was assessed at the postsynaptic level using isolated fundus smooth muscle strips. Maximal contractile responses to carbachol and galanin were significantly decreased in fundus strips isolated from rats rendered diabetic by a single intraperitoneal injection of streptozotocin (STZ, 70 mg/kg) 1, 4 and 8 weeks before experiments. We also observed notable decrements in the slopes and Hill's coefficients without conspicuous changes in the EC50 of the respective galanin concentration-response curves measured in strips obtained from STZ animals after 4 and 8 weeks. L-NAME reversed the above-mentioned alterations in an L-arginine-sensitive manner in STZ rats after 4 weeks but not in STZ rats after 8 weeks. The blood plasma nitriteitrate levels in STZ animals after 4 and 8 weeks were increased by 44.6 and 61.9%, respectively. Ca2+-independent nitric oxide synthase activity in gastric fundus strips and stomach corpus mucosa from STZ rats after 4 weeks was markedly enhanced by 37.4 and 31.9%, respectively, suggesting an enhanced nitric oxide production. In vivo insulin treatment prevented diabetes-induced alterations in smooth muscle contractility. We conclude that the smooth muscle dysfunction evoked by experimental diabetes causing diminished contractions of fundus strips to carbachol and galanin is at least partly due to the increased nitric oxide synthesis.
机译:使用孤立的眼底平滑肌条在突触后水平评估胆碱能和肽能途径在与糖尿病性胃轻瘫相关的胃动力损害中的作用。在实验前1、4和8周,通过单次腹膜内注射链脲佐菌素(STZ,70 mg / kg)从患糖尿病的大鼠分离出的眼底条中,对卡巴胆碱和甘丙肽的最大收缩反应显着降低。我们还观察到在4周和8周后从STZ动物获得的试纸条中测得的各甘丙肽浓度-响应曲线的EC50均没有显着变化,但斜率和Hill系数显着下降。 L-NAME在4周后以L-精氨酸敏感性方式逆转了上述变化,但在8周后未在STZ大鼠中逆转。 4周和8周后,STZ动物的血浆亚硝酸盐/硝酸盐水平分别增加了44.6%和61.9%。 4周后,来自STZ大鼠的胃底条和胃体粘膜中的Ca2 +非依赖性一氧化氮合酶活性分别显着提高了37.4%和31.9%,表明一氧化氮的产生增加。体内胰岛素治疗可预防糖尿病引起的平滑肌收缩力改变。我们得出的结论是,实验性糖尿病引起的平滑肌功能障碍,导致眼底条对碳酰胆碱和甘丙肽的收缩减少,至少部分原因是一氧化氮合成增加。

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