Effect of the intracellular Ca+2 antagonist TMB-8 on serum-stimulated Na+ influx in human fibroblasts.

Effect of the intracellular Ca+2 antagonist TMB-8 on serum-stimulated Na+ influx in human fibroblasts.
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细胞内 Ca 2 拮抗剂 TMB-8 对人成纤维细胞中血清刺激的 Na 内流的影响。

DOI:
10.1016/0006-291x(82)92005-8
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发表时间:
1982
影响因子:
3.1
通讯作者:
Villereal,ML
Villereal,ML
中科院分区:
生物学4区
文献类型:
--
作者:
Owen,NE;Villereal,ML

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观察了细胞内Ca ~(2+)拮抗剂TMB-8对人成纤维细胞阿米洛利敏感性Na ~+内流途径的影响。发现TMB-8以剂量依赖性方式抑制血清或生长因子刺激的Na+内流,Ki值= 15 μM。另一方面,A23187刺激的Na+内流不被TMB-8抑制。此外,血清刺激的Na+内流也可以被钙调素拮抗剂W-13阻断。这些结果表明,血清或生长因子刺激的Na+内流与细胞内游离Ca+2水平升高有关,然后与钙调素联合收割机结合,激活阿米洛利敏感的Na+内流途径。
The effects of the intracellular Ca+2antagonist TMB-8 on the amiloride-sensitive Na+influx pathway in human fibroblasts was investigated. It was found that TMB-8 inhibits serum- or growth factor-stimulated Na+influx in a dose dependent fashion with a Ki value = 15 μM. A23187-stimulated Na+influx on the other hand, was not inhibited by TMB-8. Furthermore, serum-stimulated Na+influx could also be blocked by the calmodulin antagonist W-13. These results suggest that serum- or growth factor-stimulated Na+influx is associated with an elevation of cytosolic free Ca+2levels, which then combine with calmodulin to activate the amiloride-sensitive Na+influx pathway.
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