The involvement of pertussis toxin‐sensitive G proteins in the post receptor mechanism of central I1‐imidazoline receptors
The involvement of pertussis toxin‐sensitive G proteins in the post receptor mechanism of central I1‐imidazoline receptors
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百日咳毒素敏感 G 蛋白参与中枢 I1-咪唑啉受体后受体机制
DOI:
10.1038/sj.bjp.0701090
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发表时间:
1997
影响因子:
7.3
通讯作者:
I. Yoshiya
中科院分区:
文献类型:
--
作者:
K. Takada;Y. Hayashi;T. Kamibayashi;T. Mammoto;A. Yamatodani;Seiji Kitamura;I. Yoshiya
To elucidate the possible involvement of pertussis toxin (PTX)‐sensitive G proteins in the post receptor mechanism of α2‐adrenoceptors and imidazoline receptors, we examined the effect of pretreatment of the central nervous system with PTX on the antidysrhythmic effect of dexmedetomidine, a selective α2‐adrenoceptor agonist, and rilmenidine, a selective I1‐imidazoline receptor agonist on halothane‐adrenaline dysrhythmias in rats. Dexmedetomidine (0, 1.0, 2.0, 5.0 μg kg−1 min−1, i.v.) and rilmenidine (0, 1.0, 3.0, 10, 20 μg kg−1, i.v.) prevented the genesis of halothane‐adrenaline dysrhythmias in a dose‐dependent fashion. Both idazoxan (10, 20 μg kg−1, intracerebroventricularly (i.c.v.)), an α2‐adrenoceptor antagonist with high affinity for imidazoline receptors, and rauwolscine, (40 μg kg−1, i.c.v.), an α2‐adrenoceptor antagonist with low affinity for imidazoline receptors inhibited the action of dexmedetomidine (5.0 μg kg−1 min−1, i.v.), but the inhibitory potency of idazoxan was much greater than that of rauwolscine. While the pretreatment with PTX (0.1, 0.5, 1.0 μg kg−1, i.c.v.) did not change the dysrhythmogenecity of adrenaline, this treatment completely blocked the antidysrhythmic property of rilmenidine (20 μg kg−1, i.v.) as well as dexmedetomidine (5.0 μg kg−1 min−1, i.v.). It is suggested that central I1‐imidazoline receptors as well as α2‐adrenoceptors may be functionally coupled to PTX‐sensitive G proteins.
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DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Parini,A;Coupry,I;Graham,RM;Uzielli,I;Atlas,D;Lanier,SM
通讯作者:
Lanier,SM
DOI:
--
发表时间:
1987
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Boyajian,CL;Leslie,FM
通讯作者:
Leslie,FM
DOI:
--
发表时间:
1984-07
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
P. Bousquet;J. Feldman;J. Schwartz
通讯作者:
P. Bousquet;J. Feldman;J. Schwartz
DOI:
--
发表时间:
1987
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Boyajian,CL;Loughlin,SE;Leslie,FM
通讯作者:
Leslie,FM
影响因子:
4.4
作者:
Potter,DE;Ogidigben,MJ
通讯作者:
Ogidigben,MJ