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Effects of Nitric Oxide on the Neuronal Activity of Rat Cerebellar Purkinje Neurons  

Jang, Su-Joong (Department of Physiology, Chonnam National University Medical School)
Jeong, Han-Soong (Department of Physiology, Chonnam National University Medical School)
Park, Jong-Seong (Department of Physiology, Chonnam National University Medical School)
Abstract
This study was designed to investigate the effects of nitric oxide on the neuronal activity of rat cerebellar Purkinje cells. Sprague-Dawley rats aged 14 to 16 days were decapitated under ether anesthesia. After treatment with pronase and thermolysin, the dissociated Purkinje cells were transferred into a chamber on an inverted microscope. Spontaneous action potentials and potassium current were recorded by standard patch-clamp techniques under current and voltage-clamp modes respectively. 15 Purkinje cells revealed excitatory responses to $20\;{\mu}M$ of sodium nitroprusside (SNP) and 4 neurons (20%) did not respond to SNP. Whole potassium currents of Purkinje cells were decreased by SNP (n=10). Whole potassium currents of Purkinje cells were also decreased by L-arginine, substrate of nitric oxide (n=10). These experimental results suggest that nitric oxide increases the neuronal activity of Purkinje cells by altering the resting membrane potential and after hyperpolarization.
Keywords
Nitric oxide; Purkinje cell; L-arginine; Neuronal activity;
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