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:
影响因子:
--
通讯作者:
Rattan,S
中科院分区:
文献类型:
--
作者:
Yamato,S;Rattan,S
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.
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DOI:
10.1152/ajpgi.1990.258.1.g59
发表时间:
1990
期刊:
The American journal of physiology
影响因子:
--
作者:
Nurko,S;Rattan,S
通讯作者:
Rattan,S
影响因子:
2.4
作者:
S. Nissan;Y. Vinograd;A. Hadari;P. Merguerian;O. Zamir;O. Lernau;M. Hanani
通讯作者:
M. Hanani
影响因子:
15.9
作者:
M. Schuster;T. Hendrix;A. Mendeloff
通讯作者:
A. Mendeloff
影响因子:
29.4
作者:
M. Fargeas;J. Fioramonti;L. Buéno
通讯作者:
L. Buéno
影响因子:
7.3
作者:
Siew Peng Lim;Thomas C. Muir
通讯作者:
Thomas C. Muir