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Effect of oxytocin on contraction of rabbit proximal colon in vitro

机译:催产素对家兔近端结肠收缩的影响

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AIM: To investigate the effects of oxytocin (OT) on isolated rabbit proximal colon and its mechanism. METHODS: Both longitudinal muscle (LM) and circular muscle (CM) were suspended in a tissue chamber containing 5mL Krebs solution (37℃), bubbled continuously with 950mL·L~(-1) O_2 and 50 mL·L~(-1) CO_2. Isometric spontaneous contractile responses to oxytocin or other drugs were recorded in circular and longitudinal muscle strips. RESULTS: OT (0.1 U·L~(-1)) failed to elicit significant effects on the contractile activity of proximal colonic smooth muscle strips (P>0.05). OT (1 to 10 U·L~(-1)) decreased the mean contractile amplitude and the contractile frequency of CM and LM. Hexamethonium (10 nmol·L~(-1)) partly blocked the inhibition of oxytocin (1 U·L~(-1)) on the contractile frenquency of CM. N~ω-nitro-L-arginine-methylester(L-NAME, 1 μmol·L~(-1)), progesterone (32 μmol·L~(-1)) and estrogen (2.6 μmol·L~(-1)) had no effects on OT-induced responses. CONCLUSION: OT inhibits the motility of proximal colon in rabbits. The action is partly relevant with N receptor, but irrelevant with that of NO, progesterone or estrogen.
机译:目的:探讨催产素(OT)对离体兔近端结肠的影响及其机制。方法:将纵向肌(LM)和环形肌(CM)均悬浮在含5mL Krebs溶液(37℃)的组织室中,并分别用950mL·L〜(-1)O_2和50mL·L〜(-1)鼓泡)CO_2。对催产素或其他药物的等距自发收缩反应记录在圆形和纵向肌肉条中。结果:OT(0.1 U·L〜(-1))未能对结肠近端平滑肌条的收缩活动产生显着影响(P> 0.05)。 OT(1至10 U·L〜(-1))降低CM和LM的平均收缩幅度和收缩频率。六甲铵(10nmol·L〜(-1))部分抑制了催产素(1 U·L〜(-1))对CM收缩频率的抑制作用。 N〜ω-硝基-L-精氨酸甲酯(L-NAME,1μmol·L〜(-1)),孕酮(32μmol·L〜(-1))和雌激素(2.6μmol·L〜(-1) ))对OT诱导的反应没有影响。结论:OT可抑制家兔近端结肠运动。该作用与N受体部分相关,但与NO,孕酮或雌激素无关。

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