首页> 外文期刊>American Journal of Physiology >Motilin controls cyclic release of insulin through vagal cholinergic muscarinic pathways in fasted dogs.
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Motilin controls cyclic release of insulin through vagal cholinergic muscarinic pathways in fasted dogs.

机译:胃动素通过禁食狗的迷走胆碱能毒蕈碱途径控制胰岛素的循环释放。

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The effect of motilin on insulin release has not been studied in the interdigestive state. Adult mongrel dogs were chronically implanted with force transducers in the stomach and duodenum to monitor contractile activity, and the plasma motilin and insulin concentrations were measured by a specific radioimmunoassay and enzyme immunoassay, respectively. The concentration of insulin in plasma was found to fluctuate in close association with that of motilin and phase III of the interdigestive migrating contractions in the stomach. This spontaneous release of insulin was mimicked by intravenous infusion of motilin at a dose of 0.3 microgram.kg-1.h-1. Exogenous motilin (0.01-0.3 microgram/kg) dose dependently stimulated insulin release, which was abolished by atropine, hexamethonium, ondansetron, and truncal vagotomy. Phentolamine significantly enhanced, whereas propranolol inhibited, motilin-induced insulin release. In a perifusion system using islet cells from the canine pancreas, motilin did not affect insulin release. In conclusion, motilin stimulates insulin release through vagal cholinergic, muscarinic receptors on pancreatic beta-cells, and the effect appears to be modulated by adrenergic nerves.
机译:在消化不良状态下尚未研究胃动素对胰岛素释放的作用。将成年杂种犬长期在胃和十二指肠中植入力传感器以监测其收缩活动,并分别通过特异性放射免疫测定法和酶免疫测定法测定血浆胃动素和胰岛素浓度。发现血浆中的胰岛素浓度与胃动素和胃中消化性迁移收缩的III期密切相关地波动。胰岛素的这种自发释放通过以0.3微克.kg-1.h-1的剂量静脉内注入胃动素来模仿。外源性胃动素(0.01-0.3微克/千克)剂量依赖性地刺激胰岛素释放,阿托品,六甲铵,恩丹西酮和截断迷走神经切断了胰岛素的释放。酚妥拉明显着增强,而普萘洛尔抑制胃动素诱导的胰岛素释放。在使用来自犬胰岛的胰岛细胞的灌注系统中,胃动素不影响胰岛素释放。总之,胃动素通过胰岛β细胞上的迷走胆碱能,毒蕈碱受体刺激胰岛素释放,其作用似乎由肾上腺素能神经调节。

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