ATP-regulated K+ channel and cytosolic Ca2+ mobilization in cultured rat spinal neurons

被引:13
|
作者
Ikeuchi, Y [1 ]
Nishizaki, T [1 ]
机构
[1] KOBE UNIV,SCH MED,DEPT PHYSIOL,CHUO KU,KOBE 650,JAPAN
关键词
spinal neuron; purinoceptor; K+ channel; G-protein; protein kinase C; patch clamp; Ca2+ assay;
D O I
10.1016/0014-2999(96)00057-X
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
ATP activated the K+ channel responsible for outwardly rectifying currents via a P-2Y purinoceptor linked to a pertussis toxin-insensitive G-protein in cultured rat spinal neurons. The evoked currents were inhibited by a selective protein kinase C inhibitor. GF109203X, whereas a phospholipase C inhibitor, neomycin had no effect. These indicate that the currents are regulated by phospholipase C-independent protein kinase C activation. In addition, ATP enhanced intracellular free Ca2+ concentration. The increase in intracellular free Ca2+ concentration was inhibited by a broad G-protein inhibitor, GDP beta S, but not affected by neomycin or an inositol 1,4,5-triphosphate receptor antagonist, heparin, suggesting that the cytosolic Ca2+ mobilization is regulated by a mechanism independent of a phospholipase C-mediated phosphatidylinositol signaling. These results, thus, demonstrate that ATP has dual actions on the coupled K+ channel and cytosolic Ca2+ release.
引用
收藏
页码:163 / 169
页数:7
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