title: Effect of devazepide reversed antagonism of CCK-8 against morphine on electrical and mechanical activities of rat duodenum in vitro.
abstract: AIM:To study the antagonism of cholecystokinin octapeptide (CCK-8) against the effect of morphine and its mechanism.METHODS:The method of simultaneously recording the electrical and mechanical activities of rat duodenum in vitro was adopted.RESULTS:Acetylcholine (ACh) could increase the amplitude and the number of the spike potential (SPA and SPN of rat duodenum in vitro, followed by the increase of the duodenal contraction amplitudes (CA), showing a positive correlation. Morphine, on the contrary, inhibited the potentiation of ACh, showing a negative correlation. CCK-8 could antagonize the effects of morphine, i.e. th SPA and SPN were increased again, followed by the increase of CA. On the basis of the above, CCK-A receptor antagonist Devazepide could reverse the antagonism of CCK-8 to the effect of morphine.CONCLUSION:CCK-8 could antagonize the effect of morphine which inhibited the potentiation of ACh on the duodenal activities in vitro.Furthermore, it was inferred that the antagonistic effect of CCK-8 on morphine was mainly mediated by CCK-A receptor.
authors.forename: Man-Ying
authors.initials: MY
authors.lastname: Xu
authors.forename: Hui-Ming
authors.initials: HM
authors.lastname: Lu
authors.forename: Shu-Zhen
authors.initials: SZ
authors.lastname: Wang
authors.forename: Wen-Yan
authors.initials: WY
authors.lastname: Shi
authors.forename: Xin-Chun
authors.initials: XC
authors.lastname: Wang
authors.forename: Dong-Xiao
authors.initials: DX
authors.lastname: Yang
authors.forename: Chun-Xiao
authors.initials: CX
authors.lastname: Yang
authors.forename: Li-Zhuang
authors.initials: LZ
authors.lastname: Yang