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Angiotensin II inhibits calcium and M current channels in rat sympathetic neurons via G proteins

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Wollmuth,  Lonnie P.
Department of Cell Physiology, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Shapiro, M. S., Wollmuth, L. P., & Hille, B. (1994). Angiotensin II inhibits calcium and M current channels in rat sympathetic neurons via G proteins. Neuron, 12(6), 1319-1329. doi:10.1016/0896-6273(94)90447-2.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-A90E-8
Abstract
We characterized inhibition of N-type Ca2+ and M current K+ channels in rat superior cervical ganglion neurons by angiotensin II (angioII) using the patch clamp. Of 120 neurons, 97 showed inhibition of ICa (mean 32%), which was slow in onset and very slow to reverse under whole-cell recording conditions. This inhibition was blocked by the AT1 receptor antagonist losartan, attenuated by inclusion of 2 mM GDP-beta-S in the pipette, mostly pertussis toxin insensitive, half-sensitive to N-ethylmaleimide, and wholly voltage independent. With 20 mM instead of 0.1 mM BAPTA in the pipette, the inhibition was strongly attenuated; however, we detected no angioII-induced [Ca2+]i signal using the fluorescent indicator indo-1. IBa from cell-attached patches was reduced by bath-applied angioII (mean 33%), suggesting use of a diffusible cytoplasmic messenger. M currents were inhibited by angioII in 8 of 11 neurons (mean 50%) cultured overnight. Hence, a second agonist, angioII, may share the slow, second messenger-utilizing, pertussis toxin-insensitive signaling pathway used by muscarinic agonists.