INJECTED INOSITOL 1,4,5-TRISPHOSPHATE ACTIVATES CA-2+-SENSITIVE K+ CHANNELS IN THE PLASMALEMMA OF EREMOSPHAERA-VIRIDIS

被引:18
作者
FORSTER, B [1 ]
机构
[1] UNIV WURZBURG,INST BOT 1,W-8700 WURZBURG,GERMANY
关键词
Eremosphaera viridis; InsP[!sub]3[!/sub; K[!sup]+[!/sup; channel; Ca[!sup]2+[!/sup; -dependent; Transient potential;
D O I
10.1016/0014-5793(90)81153-F
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
InsP3, an established mediator of intracellular Ca2+ signals in animal cells, is microinjected into the cytoplasm of Eremosphaera viridis. InsP3, but not Ins, InsP1, InsP2 or F2,6-P2 induce a transient opening of Ca2+ -dependent K+ channels in the plasmalemma of this alga. This effect is indicated by a transient polarization (TP) with a simultaneous increase of membrane conductance. The TP is inhibited by TMB8 (2 mM), an intracellular Ca2+ antagonist or by BAPTA (20 mM), microinjected together with InsP3. The results suggest that InsP3 initiates an increase in the cytoplasmic Ca2+ activity and an activation of Ca2+-dependent membrane currents, hence, opening of K+ channels. © 1990.
引用
收藏
页码:197 / 201
页数:5
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