首页> 外文期刊>European Journal of Pharmacology: An International Journal >Pertussis toxin increases isoproterenol induced relaxation in field-stimulated ileum.
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Pertussis toxin increases isoproterenol induced relaxation in field-stimulated ileum.

机译:百日咳毒素会增加异丙肾上腺素诱导的回肠舒张。

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摘要

We investigated the effects of pertussis toxin on contraction in field-stimulated guinea pig ileum in the absence and presence of isoproterenol. Field-stimulation elicited pertussis toxin-insensitive contractions. Cumulative addition of isoproterenol produced a maximal 52% reduction in the contractile response. Following pertussis toxin-treatment, the maximal inhibitory effect of isoproterenol increased to 83%. Pertussis toxin had no effect on the ability isoproterenol to inhibit contractions elicited by histamine agonists. Our results suggest that the increased effectiveness of isoproterenol in pertussis toxin-treated ileum is due to an uncoupling of the muscarinic M2 receptor contractile mechanism.
机译:我们调查了在没有异丙肾上腺素存在和存在的情况下,百日咳毒素对田间刺激豚鼠回肠收缩的影响。田间刺激引起百日咳毒素不敏感的收缩。累积添加异丙肾上腺素可使收缩反应最大降低52%。百日咳毒素治疗后,异丙肾上腺素的最大抑制作用增加到83%。百日咳毒素对异丙肾上腺素抑制组胺激动剂引起的收缩的能力没有影响。我们的结果表明,异丙肾上腺素在百日咳毒素治疗的回肠中的有效性提高是由于毒蕈碱M2受体收缩机制的解偶联。

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