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Effect of orphanin FQ and morphine on sodium channel current in somatosensory area of rat cerebral cortex

Neural Regeneration Research 2007年第6期2卷 321-325页

作者： lei yang yurong li shuwei jia yunhong zhang lanwei cui lihui qu Department of Physiology Harbin Medical University Harbin 150086 Heilongjiang Province China

BACKGROUND： Some experiments have demonstrated that injecting orphanin FQ （OFQ） into lateral ventricle, which can obviously decrease the pain threshold. It is indicated that OFQ is an anti-opiate substance. However, whether OFQ has effects on sensory neuron ion channel in cerebral cortex needs to be further studied. OBJECTIVE： To investigate the effects of OFQ, morphine or their combination on sodium channel current of somatosensory neurons in rat cerebral cortex. DESIGN： Repeated measurement trial. SETTING： Department of Physiology, Harbin Medical University. MATERIALS： Fifty healthy Wistar rats, aged 12 - 16 days, of either gender, were provided by the Experimental Animal Center, Second Hospital Affiliated to Harbin Medical University. OFQ was purchased from Sigma-Aldrich Company, and morphine was provided by the Shenyang First Pharmaceutical Factory. PC2C patch clamp amplifier and LabmasterTLlwere purchased from Yibo life Science Instrument Co.,Ltd. of Huazhong University of Science and Techgnology. METHODS： This experiment was carried out in the Department of Physiology （provincial laboratory）, Harbin Medical University between January 2005 and May 2006. Cortical neurons were acutely isolated from rats, and prepared into cell suspension following culture. ①Sodium channel current of somatosensory neurons in rat cerebral cortex was recorded before and after administration by whole-cell Patch clamp technique after 50 nmol/L OFQ being added to extracellular fluid. ②The amplitude of sodium channel current of somatosensory neurons in rat cerebral cortex was recorded before and after administration by the same method after 20 μmol/L morphine being added to extracellular fluid, and then the change of sodium channel current was recorded after 50 nmol/L OFQ being added. MAIN OUTCOME MEASURES： The amplitude of sodium channel current of somatosensory neurons in rat cerebral cortex following the administration of OFQ, morphine separately or their combination.. RESULTS： ①The

关键词： orphnin morphine patch clamp sodium channel

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