Stimulation of cardiac alpha receptors increases Na/K pump current and decreases gK via a pertussis toxin-sensitive pathway.

Stimulation of cardiac alpha receptors increases Na/K pump current and decreases gK via a pertussis toxin-sensitive pathway.
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刺激心脏 α 受体会通过百日咳毒素敏感途径增加 Na/K 泵电流并降低 gK。

DOI:
10.1016/s0006-3495(88)82950-3
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发表时间:
1988
影响因子:
3.4
通讯作者:
Rosen,MR
Rosen,MR
中科院分区:
生物学3区
文献类型:
--
作者:
Shah,A;Cohen,IS;Rosen,MR

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α-肾上腺素胺对心脏浦肯野纤维的自律性发挥浓度依赖性作用(Posner, P., E. L. Farrar, and C. R. Lambert. 1976. Am. J. Physiol. 231:1415–1420;Rosen, M. R., A. J. Hordof, J. P. Ilvento, and P. Danilo, Jr. 1977 年,Res. 40:390-400;Rosen,M. R.,R. M. Weiss,和 P. Danilo,Jr. 1984。J. Pharmacol Exp。在高浓度下,它们会诱导成年犬浦肯野纤维自发放电率的β肾上腺素能增加,而在浓度低于10(-6) M时,它们的作用是通过α-肾上腺素受体介导的,主要表现为纤维自发放电率的降低。自发放电率降低的机制仍不清楚。我们在此报告,去氧肾上腺素 (10(-7) M) 会增加浦肯野肌细胞中 Na/K 泵的活性并降低背景 gK。这两种效应似乎都是 α-1 肾上腺素能效应,此外,在用百日咳毒素预处理时会被消除。这些结317:538–540) 浦肯野纤维 α-1 受体通过 GTP 调节蛋白与背景 gK 偶联。此外,他们认为去氧肾上腺素诱导的自发放电率降低是由于 Na/K 泵通过 Na/K 泵与百日咳毒素敏感的 GTP 调节蛋白的新型偶联而受到刺激。
Alpha-adrenergic amines exert concentration-dependent actions on the automaticity of cardiac Purkinje fibers (Posner, P., E. L. Farrar, and C. R. Lambert. 1976. Am. J. Physiol. 231:1415–1420; Rosen, M. R., A. J. Hordof, J. P. Ilvento, and P. Danilo, Jr. 1977. Circ. Res. 40:390–400; Rosen, M. R., R. M. Weiss, and P. Danilo, Jr. 1984. J. Pharmacol. Exp. Ther. 231:1415–1420). At high concentrations they induce a largely beta adrenergic increase in the spontaneous firing rate of adult canine Purkinje fibers, whereas at concentrations less than 10(-6) M, their effect is mediated through alpha-adrenergic receptors and is seen predominantly as a decrease in the fibers' spontaneous firing rate. The mechanism for this decrease in spontaneous firing rate remains unexplained. We report here that phenylephrine (10(-7) M) increases the activity of the Na/K pump and decreases background gK in Purkinje myocytes. Both effects appear to be alpha-1 adrenergic and, in addition, are abolished on pretreatment with pertussis toxin. These results suggest that like the atrial muscarinic receptor (Pffafinger, P. J., J. M. Martin, D. D. Hunter, N. M. Nathanson, and B. Hille. 1985. Nature [Lond.]. 317:536–538; Breitwieser, G. E., and G. Szabo. 1985. Nature [Lond.]. 317:538–540) the Purkinje fiber alpha-1 receptor is coupled to background gK via a GTP-regulatory protein. Further, they suggest that the phenylephrine-induced decrease in spontaneous firing rate is due to stimulation of the Na/K pump via a novel coupling of the Na/K pump to a pertussis toxin-sensitive GTP regulatory protein.
心脏浦肯野纤维中的α-肾上腺素能受体和起搏器电流。
DOI: --
发表时间: 1976
期刊: Nature
影响因子: 64.8
作者:
O. Hauswirth;H. Wehner;R. Ziskoven
通讯作者: R. Ziskoven
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发表时间: 1978-01-01
影响因子: 5.5
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发表时间: 1978-01-01
影响因子: 5.5
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受神经支配的心肌细胞获得与 α1 受体相连的百日咳毒素特异性调节蛋白。
DOI: 10.1126/science.2994230
发表时间: 1985
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Steinberg,SF;Drugge,ED;Bilezikian,JP;Robinson,RB
通讯作者: Robinson,RB
肾上腺素对心脏Purkinje纤维的起搏器钾电流的影响。
DOI: 10.1085/jgp.64.3.293
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影响因子: 3.8
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Tsien, R W
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