Modulation of agonist binding by guanine nucleotides in CHO cells expressing muscarinic m1 – m5 receptors
Modulation of agonist binding by guanine nucleotides in CHO cells expressing muscarinic m1 – m5 receptors
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表达毒蕈碱 m1 – m5 受体的 CHO 细胞中鸟嘌呤核苷酸对激动剂结合的调节
DOI:
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发表时间:
1995
期刊:
影响因子:
--
通讯作者:
R. Leppik
中科院分区:
文献类型:
--
作者:
P. Giersbergen;R. Leppik
In membranes prepared from CHO-m2 cells, inhibition of [3H]-N-methylscopolamine ([3H]NMS) binding by several muscarinic agonists resulted in competition curves with Hill slopes significantly different from unity. Addition of 5′-guanylylimidodiphosphate (Gpp(NH)p) led to an increase in the IC50 value of the agonists with significant steepening of the inhibition curves. The shift in potency induced by Gpp(NH)p differed among the agonists with a rank order of oxotremorine-M = carbachol > oxotremorine > McN-A-343 = pilocarpine. In CHO-m4 membranes, Gpp(NH)p was less efficacious than in CHO-m2 membranes whereas no effect of the guanine nucleotide was found in membranes prepared from CHO-m1, -m3, and-m5 cells. No major differences in the effect of Gpp(NH)p among agonists were found in CHO-m4 cells. Atropine binding was not affected by the guanine nucleotide. Together, these results indicate that coupling of G-proteins to muscarinic receptors linked to inhibition of cyclic adenosine monophosphate (cAMP) (m2 and m4) but not of those linked to phosphoinositol turnover (m1, m3 and m5) can be perturbed by Gpp(NH)p. The differential effects observed with Gpp(NH)p between agonist binding to m2 and m4 receptors appear to be receptor-specific and may reflect differences in the G proteins activated by these receptors in CHO cells.
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影响因子:
3.6
作者:
Luthin,GR;Harkness,J;Artymyshyn,RP;Wolfe,BB
通讯作者:
Wolfe,BB
DOI:
--
发表时间:
1991
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Parker,EM;Kameyama,K;Higashijima,T;Ross,EM
通讯作者:
Ross,EM
影响因子:
3.6
作者:
Yasuda,RP;Ciesla,W;Flores,LR;Wall,SJ;Li,M;Satkus,SA;Weisstein,JS;Spagnola,BV;Wolfe,BB
通讯作者:
Wolfe,BB
影响因子:
5.8
作者:
Aronstam,RS;Narayanan,TK
通讯作者:
Narayanan,TK
影响因子:
3.6
作者:
Harden,TK;Scheer,AG;Smith,MM
通讯作者:
Smith,MM