Microinjection of L-glutamate into the nucleus ambiguus partially inhibits gastric motility through the NMDA receptor - nitric oxide pathway

文献类型: 外文期刊

第一作者: Sun, Hong-Zhao

作者: Sun, Hong-Zhao;Zhao, Shu-Zhen;Ai, Hong-Bin

作者机构:

关键词: gastric motility;L-glutamate;nitric oxide;NMDA receptor;nucleus ambiguus

期刊名称:CANADIAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY ( 影响因子:2.273; 五年影响因子:2.45 )

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收录情况: SCI

摘要: We have previously reported that both L-glutamate (L-Glu) and nitric oxide (NO) modulate gastric motility in the nucleus ambiguus (NA). The aim of this study is to explore the potential correlation between the L-Glu and NO. A latex balloon connected to a pressure transducer was inserted into the pylorus through the fundus of anesthetized male Wistar rats to continuously record changes in gastric smooth muscle contractile curves. Pretreatment with the NO-synthase inhibitor N-nitro-L- arginine methylester (L-NAME) did not completely abolish the inhibitory effect of L-Glu on gastric motility, but intravenous injection of the ganglionic blocker hexamethonium bromide (Hb) did. By using a specific N-methyl-D-aspartic acid (NMDA) receptor antagonist, we blocked the inhibitory effect of the NO-donor sodium nitroprusside (SNP) on gastric motility. These results suggest that microinjections of L-Glu into the NA inhibits gastric motility by activating the cholinergic preganglionic neurons, partially through the NMDA receptor - NO pathway.

分类号: R96

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