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机构地区:[1]第四军医大学基础部人体解剖学与组织胚胎学教研室暨梁銶锯脑研究中心
出 处:《神经解剖学杂志》2008年第2期147-151,共5页Chinese Journal of Neuroanatomy
基 金:国家自然科学基金(No.30771133);陕西省自然科学基金(2006C10)资助项目
摘 要:为探讨吸入性麻醉剂安氟醚对海马CA1区锥体神经元的γ-氨基丁酸(GABA)能自发性微小抑制性突触后电流(mIP-SCs)的调控作用,本研究采用酶消化和机械分离的单细胞模型,应用制霉菌素穿孔膜片钳技术,记录安氟醚对海马CA1区锥体神经元的GABA能突触后电流的影响。结果显示:(1)安氟醚可使GABA的浓度-效应曲线平行左移,但不影响GABA引起的最大反应;(2)安氟醚能够可逆性地增大GABA能自发性mIPSCs的发放频率而不影响其幅度;(3)在无钙细胞外液条件下,仍能观察到安氟醚对GABA能自发性mIPSCs发放频率的增强作用;膜通透性胞内钙库Ca2+的螯合剂BAPTA-AM可抑制安氟醚的增强作用。以上结果提示在海马CA1区安氟醚可能通过释放胞内钙库内的Ca2+使神经终末内Ca2+浓度升高而增加GABA的释放,从而达到中枢抑制作用。To investigate the effects of enflurane on the γ-aminobutyric acid-ergic (GABAergic) spantsneous miniature inhibitory postsynaptie currents (mIPSCs) in acutely enzyme-treatment and mechanical dissociated single rat hippocampus CA1 pyramidal neurons, nystatinperforated patch recording technique was used in the present study under voltage-clamp conditions. The results showed : ( 1 ) Enflurane shifted the GABA concentration-respense curve to the left in a parallel fashion without changing the maximum response; (2) Enflurane reversibly increased the frequency of the mIPSCs without affecting the mean amplitude; (3) The increase in the frequency of mlPSCs in the presence of the enflurane was also observed in Ca^2+ -free external solution. Membrane permeable and selective chelator of intraeellular Ca^2+ stores, BAPTA-AM, prohibited the facilitatory effect of enflurane on the spontaneous mIPSCs frequency. The present results sugges- ted that enflurane may increase the Ca^2+ concentration in the GABAergie presynaptie nerve terminals on the hippocampal CA1 pyramidal neurons by enhancing the release of Ca^2+ from intraeellular Ca^2+ stores.
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