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cAMP and in vitro inotropic actions of secretin and VIP in rat papillary muscle.

机译:cAMP和大鼠乳头肌中促胰液素和VIP的体外正性肌力作用。

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摘要

Secretin and VIP stimulate cardiac adenylyl cyclase activity and exert a positive inotropic action in several mammalian species. This study examined positive inotropic activity and cAMP levels in rat papillary muscle. Isoproterenol and secretin increased contractions by 150+/-31% and 129+/-27%, respectively. VIP increased contraction by 30+/-21% only at 10 microM. Isoproterenol significantly increased cAMP levels by 82%, whereas increases by secretin (58%) and VIP (56%) were not significant. These results are consistent with reports that secretin and VIP stimulate cardiac adenylyl cyclase in the rat, but suggest that cAMP tissue levels cannot totally explain the positive inotropic responses to secretin and VIP.
机译:促胰液素和VIP刺激心脏腺苷酸环化酶活性,并在几种哺乳动物中发挥正性肌力作用。这项研究检查了大鼠乳头肌中的正性肌力活动和cAMP水平。异丙肾上腺素和促胰液素分别使收缩增加150 +/- 31%和129 +/- 27%。 VIP仅在10 microM时收缩增加30 +/- 21%。异丙肾上腺素可将cAMP水平显着提高82%,而促胰液素(58%)和VIP(56%)的升高并不显着。这些结果与关于促胰液素和VIP刺激大鼠心脏腺苷酸环化酶的报道一致,但是表明cAMP组织水平不能完全解释对促胰液素和VIP的正性肌力反应。

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