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.
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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:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Ives,HE
Ives,HE
中科院分区:
--
文献类型:
--
作者:
Mitsuhashi,T;MorrisJr,RC;Ives,HE

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内皮素是一种有效的哺乳动物血管收缩肽,与阳离子通道结合昆虫毒素具有结构同源性。我们测试了这种肽直接激活培养的血管平滑肌 (VSM) 细胞中二氢吡啶敏感的 Ca2+ 通道的提议。首先,我们发现 VSM 中的细胞 Ca2+ 可以通过激活电压操作的 Ca2+ 通道来改变。 KCl 诱导的去极化和二氢吡啶 Ca2+ 通道激动剂 (-) Bay K 8644 (10 microM) 均可使细胞 Ca2+ 升高两倍以上; KCl 的作用被抑制性对映体 (+) Bay K 8644 (40 microM) 阻断。在中国仓鼠卵巢(CHO)细胞中也观察到类似的反应。合成内皮素 (4 x 10(-8) M) 在 12 秒内将 VSM 中的 Ca2+ 从 100 +/- 17 提高到 561 +/- 34 nM,但不提高 CHO 细胞中的 Ca2+。 30 分钟后 Ca2+ 随后降至基础水平。半最大 Ca2+ 反应为 4 x 10(-9) M 内皮素。与内皮素不同,凝血酶在 VSM 和 CHO 细胞中都会升高 Ca2+。 Ca2+ 对内皮素和凝血酶的反应不受尼卡地平 (1 µM)、(+) Bay K 8644 或不含 Ca2+ 溶液的影响。最后,这两种激素都会导致 VSM 细胞中磷酸肌醇的释放。然而,对凝血酶的反应比对内皮素的反应大10倍以上且更快;凝血酶反应对百日咳毒素敏感,而对内皮素反应则不然。因此,内皮素与凝血酶一样,通过动员细胞内储备而不是通过激活二氢吡啶敏感的 Ca2+ 通道来升高 VSM 中的细胞 Ca2+。然而,它们的受体是不同的,并且它们在信号转导方面表现出重要的差异。
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.
DOI: 10.1016/s0006-291x(88)81064-7
发表时间: 1988-08-30
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DOI: 10.1152/physiologyonline.1989.4.4.139
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