Endothelin-induced increases in vascular smooth muscle Ca2+ do not depend on dihydropyridine-sensitive Ca2+ channels.
Endothelin-induced increases in vascular smooth muscle Ca2+ do not depend on dihydropyridine-sensitive Ca2+ channels.
复制标题
内皮素诱导的血管平滑肌 Ca2+ 增加不依赖于二氢吡啶敏感 Ca2+ 通道。
DOI:
10.1172/jci114209
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发表时间:
1989
期刊:
影响因子:
--
通讯作者:
Ives,HE
中科院分区:
文献类型:
--
作者:
Mitsuhashi,T;MorrisJr,RC;Ives,HE
Endothelin is a potent mammalian vasoconstrictive peptide with structural homology to cation channel-binding insect toxins. We tested the proposal that this peptide directly activates dihydropyridine-sensitive Ca2+ channels in cultured vascular smooth muscle (VSM) cells. First, we found that cell Ca2+ can be altered in VSM by activation of voltage-operated Ca2+ channels. KCl-induced depolarization and the dihydropyridine Ca2+ channel agonist (-) Bay K 8644 (10 microM) both raised cell Ca2+ more than twofold; the effect of KCl was blocked by the inhibitory enantiomer, (+) Bay K 8644 (40 microM). Similar responses were observed in Chinese hamster ovary (CHO) cells. Synthetic endothelin (4 x 10(-8) M) raised Ca2+ in VSM but not CHO cells from 100 +/- 17 to 561 +/- 34 nM within 12 s. Ca2+ subsequently fell to basal levels after 30 min. Half maximal Ca2+ response was at 4 x 10(-9) M endothelin. Unlike endothelin, thrombin raised Ca2+ in both VSM and CHO cells. The Ca2+ responses to endothelin and thrombin were not affected by nicardipine (1 microM), (+) Bay K 8644, or Ca2+-free solutions. Lastly, both hormones caused release of inositol phosphates in VSM cells. However, the response to thrombin was more than 10-fold larger and was more rapid than the response to endothelin; the thrombin response was sensitive to pertussis toxin, while the response to endothelin was not. Thus endothelin, like thrombin, raises cell Ca2+ in VSM by mobilization of intracellular stores and not by activation of dihydropyridine-sensitive Ca2+ channels. However, their receptors are distinct and they exhibit important differences in signal transduction.
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DOI:
10.1016/s0006-291x(88)81064-7
发表时间:
1988-08-30
影响因子:
3.1
作者:
FUKUDA, Y;HIRATA, Y;MASAKI, T
通讯作者:
MASAKI, T
DOI:
--
发表时间:
1985-03
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
G. Grynkiewicz;M. Poenie;Roger Y. TsienB
通讯作者:
G. Grynkiewicz;M. Poenie;Roger Y. TsienB
影响因子:
8.4
作者:
Torrent Daniel;H. Ives
通讯作者:
H. Ives
DOI:
10.1056/nejm198604243141707
发表时间:
1986
期刊:
The New England journal of medicine
影响因子:
--
作者:
H. Rasmussen
通讯作者:
H. Rasmussen
DOI:
10.1016/s0021-9258(18)61389-4
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
T. Biden;B. Peter;W. Schlegel;C. Wollheim
通讯作者:
C. Wollheim