Regulation of the cardiac L-type calcium channel in L6 cells by arginine-vasopressin.
Regulation of the cardiac L-type calcium channel in L6 cells by arginine-vasopressin.
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精氨酸加压素对 L6 细胞中心脏 L 型钙通道的调节。
DOI:
10.1042/bj20060742
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
Reeves,JohnP
中科院分区:
文献类型:
--
作者:
Hantash,BasilM;Thomas,AndrewP;Reeves,JohnP
L-type Ca2+channel activity was measured in L6 cells as nifedipine-sensitive barium (Ba2+; 5 mM) influx in a depolarizing salt solution containing 140 mM KCl. Addition of AVP (arginine-vasopressin) during Ba2+uptake reduced the rate of Ba2+influx by 60–100%; this was followed by a gradual restoration of the initial rate of Ba2+uptake. Blockade of PKC (protein kinase C) by pretreatment with 10 μM bisindolylmaleimide did not affect the initial inhibition of Ba2+influx, but completely abolished the recovery phase. The effect of AVP was half-maximal at 10 nM AVP and was blocked by the V1a receptor antagonist d-(CH2)5-Tyr(Me)-AVP. Activation of Gαsby isoprenaline or cholera toxin antagonized the actions of AVP on Ba2+uptake. This protection persisted in the presence of the PKA (protein kinase A) inhibitor KT5720, and was not mimicked by agents that increase cAMP. Inhibition of Ba2+influx was also elicited by ATP and ET (endothelin 1) with an order of effectiveness ET<ATP<AVP. Each of these agents has been reported to act through Gq-coupled receptors. We conclude that activation of Gq-coupled receptors produces a rapid inhibition of the cardiac L-type Ca2+channel, which is subsequently overcome by activation of PKC.
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影响因子:
3.9
作者:
F. Kalkbrenner;A. Abel;N. Wittau;G. Schultz
通讯作者:
G. Schultz
DOI:
10.1007/s004240050291
发表时间:
1996
期刊:
Pflügers Archiv
影响因子:
--
作者:
L. Bulteau;Michel Cogné;C. Cognard;Guy Raymond
通讯作者:
Guy Raymond
DOI:
--
发表时间:
1999
期刊:
AJP - Renal Physiology
影响因子:
--
作者:
R. Edinger;M. D. Rokaw;John P. Johnson
通讯作者:
John P. Johnson
影响因子:
--
作者:
B. H. Shah
通讯作者:
B. H. Shah
影响因子:
3
作者:
N. Delpech;H. Soustre;D. Potreau
通讯作者:
D. Potreau