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
中科院分区:
文献类型:
--
作者:
Shah,A;Cohen,IS;Rosen,MR
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.
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影响因子:
64.8
作者:
O. Hauswirth;H. Wehner;R. Ziskoven
通讯作者:
R. Ziskoven
影响因子:
5.5
作者:
STANDEN, NB;STANFIELD, PR
通讯作者:
STANFIELD, PR
影响因子:
5.5
作者:
HAGIWARA, S;MIYAZAKI, S;PATLAK, J
通讯作者:
PATLAK, J
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
影响因子:
3.8
作者:
Tsien, R W
通讯作者:
Tsien, R W