DISTINCT, CONVERGENT 2ND MESSENGER PATHWAYS MODULATE NEURONAL CALCIUM CURRENTS

被引:68
作者
DIVERSEPIERLUISSI, M
DUNLAP, K
机构
[1] Department of Physiology Tufts University School of Medicine Boston
关键词
D O I
10.1016/0896-6273(93)90175-Q
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Norepinephrine (NE) and gamma-aminobutyric acid (GABA) inhibit N-type calcium channels in embryonic chick sensory neurons. We demonstrate here that the modulatory actions of the two transmitters are mediated through distinct biochemical pathways. Intracellular application of the pseudosubstrate inhibitor for protein kinase C blocks the inhibition produced by NE (and the protein kinase C activator oleoylacetylglycerol), but not that produced by GABA. Calcium current inhibition produced by oleoylacetylglycerol occludes inhibition by subsequent application of NE; GABA-mediated inhibition, however, is not eliminated by prior activation of protein kinase C. These results demonstrate that multiple biochemical pathways converge to control N-type calcium channel function.
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页码:753 / 760
页数:8
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