首页> 外文期刊>American Journal of Physiology >Shear stress-induced nitric oxide antagonizes adenosine effects on intestinal metabolism.
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Shear stress-induced nitric oxide antagonizes adenosine effects on intestinal metabolism.

机译:剪应力诱导的一氧化氮拮抗腺苷对肠道代谢的影响。

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The influence of nitric oxide (NO) on adenosine-induced metabolic effects was studied in the intestine. Blood flow supplied an in situ- isolated segment of small intestine in anesthetized cats via the superior mesenteric artery (SMA) and was controlled by a vascular circuit. The SMA and portal samples were taken for analysis of oxygen and lactate. Adenosine (0.4 mg. kg-1. min-1, intra-SMA) reduced oxygen consumption by 25.1 +/- 2.9 from 73.1 +/- 10.8 micromol. min-1. 100 g-1 and increased lactate production by 13.3 +/- 3.0 from 12.8 +/- 4.6 micromol. min-1. 100 g tissue-1 during constant-flow (CF, decreased shear stress) but not during constant-pressure (CP, increased shear stress) perfusion. Blockade of NO synthase using Nomega-nitro-L-arginine methyl ester did not affect the metabolic effects of adenosine during CF but eliminated the differences seen between CP and CF perfusion. A NO donor, 3-morpholinosydnonimine, attenuated the metabolic effects of adenosine during CF perfusion. The results suggested that shear-induced NO antagonized metabolic effects of adenosine but that the inhibition of vascular effects by NO was not shear dependent since it occurred in both CP and CF perfusion.
机译:一氧化氮(NO)对腺苷诱导的代谢作用的影响在肠道中进行了研究。血流通过肠系膜上动脉(SMA)在麻醉的猫中提供了一个原位分离的小肠段,并由血管回路控制。取出SMA和门户样品以分析氧气和乳酸。腺苷(0.4 mg。kg-1。min-1,SMA内)从73.1 +/- 10.8微摩尔减少了25.1 +/- 2.9的耗氧量。 min-1。 100 g-1,乳酸产量从12.8 +/- 4.6微摩尔增加了13.3 +/- 3.0。 min-1。在恒流(CF,剪切应力降低)过程中100 g组织-1,但在恒压(CP,剪切应力增加)灌注过程中不是100 g组织-1。使用Nomega-nitro-L-精氨酸甲酯阻断NO合酶不会影响CF期间腺苷的代谢作用,但消除了CP和CF灌注之间的差异。 NO供体3-吗啉代亚砜亚胺可减弱CF灌注过程中腺苷的代谢作用。结果表明,剪切诱导的NO拮抗腺苷的代谢作用,但NO对血管作用的抑制作用与剪切无关,因为它同时发生在CP和CF灌注中。

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