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Inhibition of nitric oxide synthesis blocks the inhibitory response to capsaicin in intestinal circular muscle preparations from different species

机译:一氧化氮合成的抑制作用会阻止不同物种的肠道环形肌肉制剂对辣椒素的抑制反应

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Moderate concentrations of the sensory stimulant drug capsaicin caused relaxation in human and animal intestinal circular muscle preparations (guinea-pig proximal, mouse distal colon, human small intestine and appendix) in vitro. With the exception of the guinea-pig colon, the nitric oxide (NO) synthase inhibitor N-G -nitro-Larginine (L-NOARG; 10(-4) M) strongly inhibited the relaxant effect of capsaicin. Tetrodotoxin, an inhibitor of voltage-sensitive Na+ channels failed to significantly reduce the inhibitory effect of capsaicin in the guinea-pig colon, human ileum and appendix; it caused an approximately 50% reduction in the mouse colon. The relaxant effect of capsaicin was strongly reduced in colonic preparations from transient receptor potential vanilloid type (TRPV1) receptor knockout mice as compared to their wildtype controls. It is concluded that nitric oxide, possibly of sensory origin, is involved in the relaxant action of capsaicin in the circular muscle of the mouse and human intestine. (c) 2005 Elsevier Inc. All rights reserved.
机译:适度浓度的感官刺激药物辣椒素在体外导致人和动物肠环形肌制剂(豚鼠近端,小鼠远端结肠,人小肠和阑尾)松弛。除豚鼠结肠外,一氧化氮(NO)合酶抑制剂N-G-硝基-精氨酸(L-NOARG; 10(-4)M)强烈抑制辣椒素的松弛作用。河豚毒素,一种电压敏感的Na +通道抑制剂,不能显着降低辣椒素对豚鼠结肠,人回肠和阑尾的抑制作用;它导致小鼠结肠大约减少了50%。与野生型对照相比,在瞬时受体电位类香草酸型(TRPV1)受体敲除小鼠的结肠制剂中,辣椒素的松弛作用大大降低。结论是一氧化氮(可能是感觉起源的)参与了辣椒素在小鼠和人肠的环形肌中的松弛作用。 (c)2005 Elsevier Inc.保留所有权利。

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