Role of alpha adrenoceptors in opossum internal anal sphincter.

Role of alpha adrenoceptors in opossum internal anal sphincter.
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α肾上腺素受体在负鼠肛门内括约肌中的作用。

DOI:
10.1172/jci114728
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发表时间:
1990
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Rattan,S
Rattan,S
中科院分区:
--
文献类型:
--
作者:
Yamato,S;Rattan,S

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本研究的目的是探讨α肾上腺素受体在肛门内括约肌(IAS)中的作用。对α-氯醛糖麻醉的负鼠进行了研究。使用低顺应性连续灌注导管记录IAS(IASP)中的静息压。α-1肾上腺素能受体激动剂苯肾上腺素和α-2肾上腺素能受体激动剂可乐定及其相应的选择性拮抗剂,哌唑嗪和育亨宾,分别对静息IASP和直肠球囊扩张(RBD)介导的IAS松弛的影响进行了研究。苯乙哌啶引起IASP升高,但哌唑嗪可阻断IASP升高,育亨宾则不能。苯肾上腺素对RBD引起的IAS舒张无影响。另一方面,可乐定对RBD引起的IAS舒张反应产生显著抑制,但对静息IASP的影响极小。可乐定对IAS舒张的抑制作用可被育亨宾选择性地拮抗,而哌唑嗪则不拮抗。从这些研究中,我们得出结论,α-2肾上腺素能受体发挥重要的神经调节作用的直肠肛门抑制反射,而α-1肾上腺素能受体可能发挥调节作用的休息IAS紧张。
The purpose of the present investigation was to examine the role of alpha adrenoceptors in the internal anal sphincter (IAS). Studies wer performed on alpha-chloralose anesthetized opossums. Resting pressure in the IAS (IASP) was recorded using low compliant continuously perfused catheters. The effects of the alpha-1 adrenoceptor agonist phenylephrine and alpha-2 adrenoceptor agonist clonidine and their corresponding selective antagonists, prazosin and yohimbine, respectively, were examined on the resting IASP, and on rectal balloon distension (RBD)-mediated IAS relaxation. Phenylephrine caused a rise in the IASP that was blocked by prazosin and not by yohimbine. Phenylephrine had no effect on IAS relaxation caused by RBD. Clonidine on the other hand caused significant suppression of IAS relaxation in response to RBD, but caused minimal changes in the resting IASP. The suppression of IAS relaxation by clonidine was selectively antagonized by yohimbine but not by prazosin. From these studies we conclude that alpha-2 adrenoceptors exert important neuromodulatory influences on rectoanal inhibitory reflex, while alpha-1 adrenoceptors may exert modulatory effects on the resting IAS tone.
神经肽 Y 在负鼠肛门内括约肌中的作用。
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