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咪达唑仑对新生大鼠离体脊髓运动神经元的作用.doc

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文档介绍:咪达唑仑对新生大鼠离体脊髓运动神经元的作用
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
基金项目:安徽省自然科学基金(090413084)
作者简介:宦才娟(1981-),女, 2008级硕士研究生, (电话) ,(电子邮箱)hcj520 ***@;汪萌芽,男,教授,博士,硕士生导师, *通讯作者(E-mail: ******@)
宦才娟,汪萌芽*
(皖南医学院细胞电生理研究室,安徽 芜湖241002)
Effects of midazolam on motoneurons in neonatal rat spinal cord in vitro
HUAN Cai—juan, WANG Meng-ya*
Cell Electrophysiology Laboratory, Wannan Medical College, Wuhu, Anhui 241002, China
[Abstract] Objective: To observe the effects of midazolam on motoneurons (MNs) in neonatal rat spinal cord slices. Methods: The conventional intracellular recording techniques were used to observe the effects of midazolam at distinct concentration on MNs of spinal cord slices isolated from neonatal rats (8~14d old). Results: In the 5 MNs steadily recorded, not only a depolarization response of (18。2±) mV with increase of membrane resistance was induced by perfusion of midazolam at —1。0 mmol/L for 15 min of each concentration (, P〈 or P<), but also amplitude of action potentials was decreased (P<), and even action potentials were nullified in 2 MNs. In 4 MNs with dorsal rootlet stimulation—evoked excitatory postsynaptic potentials (DR-EPSPs), bath of midazolam (-1。0 mmol/L) reversibly depressed DR-EPSPs in a concentration-dependent manner。 Moreover, in 3 MNs with DR—EPSP followed by inhibitory postsynaptic potentials (DR—IPSPs), DR-EPSPs were inhibited and DR-IPSPs were enhanced by midazolam at low concentration, whereas both of them were nullified at high concentration. Conclusion: The findings suggest that midazolam may reversibly and concentration-dependently inhibit the MN excitability and its synaptic transmission from sensory inputs.
[Key words]: spinal cord; motoneuron; synaptic transmission; midazolam; electrophysiology
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
咪达唑仑对新生大鼠离体脊髓运动神经元的作用
[摘  要] 目的: 观察咪达唑仑对新生大鼠离体脊髓运动神经元(MN): 采用常规细胞内记录技术,观察不同浓度的咪达唑仑对新生大鼠(8~14d)离体脊髓MN的作用。