Erythromycin inhibits rabbit pyloric smooth muscle through neuronal motilin receptors.

Erythromycin inhibits rabbit pyloric smooth muscle through neuronal motilin receptors.
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红霉素通过神经元胃动素受体抑制兔幽门平滑肌。

DOI:
10.1053/gast.1996.v111.pm8780573
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发表时间:
1996
期刊:
影响因子:
29.4
通讯作者:
Ryan,JP
Ryan,JP
中科院分区:
医学1区
文献类型:
--
作者:
Parkman,HP;Pagano,AP;Ryan,JP

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背景:红霉素促进胃排空的作用主要归因于胃窦收缩功能的增强。本研究的目的是研究红霉素对幽门肌条的作用。方法对幽门肌条进行体外研究。结果幽门肌条出现自发性时相收缩,收缩频率为每分钟1.9+/-0.1次。红霉素和胃动素对幽门肌的抑制作用呈剂量依赖性。在最大有效剂量(50mumol/L)时,红霉素使自发收缩停止1.8±0.2分钟,使初始2分钟运动指数降至基础收缩的35%±9%(P<0.01)。在河豚毒素存在的情况下,红霉素和胃动素都能增加幽门的收缩能力。无论有没有河豚毒素,胃动素的快速反应都会取消红霉素的作用。N-硝基-L-精氨酸甲酯和血管活性肠肽拮抗剂[4-氯-D-Phe6,Leu17]均可减弱红霉素的抑制作用。结论幽门肌和幽门肌抑制神经元上均存在胃动素受体,红霉素对幽门的初级作用是通过激活抑制运动神经元上的胃动素受体来实现的,一氧化氮和血管活性肠肽均可介导红霉素的抑制作用。(《胃肠病学》1996年9月第111(3)期:682-90页)
BACKGROUND & AIMSErythromycin's effect in accelerating gastric emptying is attributed primarily to increased antral contractility. The aim of this study was to characterize erythromycin's effect on pyloric muscle.METHODSRabbit pyloric muscle strips were studied in vitro.RESULTSPyloric muscle strips developed spontaneous phasic contractions with a frequency of 1.9 +/- 0.1 contractions per minute. Erythromycin and motilin had dose-dependent inhibitory effects on pyloric muscle. At the maximal effective dose (50 mumol/L), erythromycin caused cessation of spontaneous contractions for 1.8 +/- 0.2 minutes, decreasing the initial 2-minute motility index to 35% +/- 9% (P < 0.01) of basal. In the presence of tetrodotoxin, both erythromycin and motilin increased pyloric contractility. Motilin tachyphylaxis both in the presence or absence of tetrodotoxin abolished the effects of erythromycin. The inhibitory effect of erythromycin was decreased by NG-nitro-L-arginine methyl ester and the vasoactive intestinal peptide antagonist [4-Chloro-D-Phe6, Leu17]vasoactive intestinal peptide.CONCLUSIONSThese studies suggest that motilin receptors are present on both pyloric muscle and inhibitory neurons to pyloric muscle, that the primary effect of erythromycin on the pylorus is mediated by activating motilin receptors on inhibitory motor neurons, and that both nitric oxide and vasoactive intestinal peptide may mediate the inhibitory effect of erythromycin. (Gastroenterology 1996 Sep;111(3):682-90)
红霉素可增强人类的禁食和餐后近端胃张力。
DOI: --
发表时间: 1995
期刊: Gastroenterology
影响因子: 29.4
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