[Effect of arginine vasopressin on membrane potential of dorsal root ganglion neurons in rats].
The effect of arginine vasopressin (AVP) on membrane potential of neurons from dorsal root ganglion (DRG) was examined in the rat by means of intracellular recording technique. The results showed that (1) AVP induced hyperpolarization in the membrane of most DRG neurons. (2) The membrane conductance of the DRG neurons increased by 19.32% following application of AVP (p<0.05). (3) Perfusion with balance sodium solution (BSS) containing Cd(2+) (blocker of Ca(2+) channel) instead of Na+ failed to affect the AVP-induced membrane hyperpolarization of the DRG neurons (p> 0.05). After perfusion with BSS containing tetraethylammonium (TEA), however, the extent of AVP-induced hyperpolarization was reduced (p<0.05). (4) The AVP-induced hyperpolarization of the neurons was blocked by the antagonist of AVP V(1) receptors. The results demonstrate that AVP induces hyperpolarization of most DRG neurons, which might be caused by K(+) outflow mediated by AVP V(1) receptors in the membrane of the neurons.
Department of Physiology, Shihezi University School of Medicine, Shihezi 832000, Xinjiang, China. hyhoo@163.com
Hai-Yan
HY
Hu
Zhi-Ping
ZP
Sun
Yi-Mei
YM
Zhao
Jun-Qiang
JQ
Si
Yu
Y
Zheng
D000818:Animals; D001127:Arginine Vasopressin / Q000494:pharmacology*; D005727:Ganglia, Spinal / Q000187:drug effects / Q000502:physiology*; D008564:Membrane Potentials / Q000187:drug effects; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D018408:Patch-Clamp Techniques; D026902:Potassium Channel Blockers / Q000494:pharmacology; D015221:Potassium Channels / Q000187:drug effects; D051381:Rats; D019789:Tetraethylammonium / Q000494:pharmacology
D026902:Potassium Channel Blockers; D015221:Potassium Channels; D001127:Arginine Vasopressin; D019789:Tetraethylammonium