PTD-BDNF对海马神经元兴奋性突触活动的作用  被引量:4

Effect of PTD-BDNF on excitatory synaptic activity of hippocampal neurons

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作  者:李冠华[1] 庞立伟[1] 周建平[2] 孙曼霁[2] 姜雨鸽[1] 冯泽国[1] 

机构地区:[1]中国人民解放军总医院麻醉手术中心,北京100853 [2]军事医学科学院毒物药物研究所,北京100850

出  处:《中国新药杂志》2008年第6期468-471,共4页Chinese Journal of New Drugs

基  金:军队十一五科技攻关项目(06G119)

摘  要:目的:研究具有跨血脑屏障功能的PTD-BDNF对培养海马神经元细胞自发电活动的作用。方法:应用全细胞膜片钳技术,观察脑源性神经营养因子(BDNF)和蛋白转导结构域-脑源性神经营养因子(PTD-BDNF)对原代培养大鼠海马神经元自发突触活动的影响。结果:与对照组比较,BDNF与PTD-BDNF作用后均可明显增加海马神经元自发兴奋性突触后电流(sEPSC)和微小兴奋性突触后电流(mEPSC)的产生频率[sEPSC的频率:(1.4±0.5)vs(4.0±0.6),(3.9±0.5)Hz,均为P<0.01;mEPSC的频率:(4.2±1.0)vs(7.9±1.9),(7.6±1.8)Hz,均为P<0.01],并增加sEPSC的幅度但并不影响mEPSC的幅度[sEPSC的幅度:(415.7±48.0)vs(743.7±95.7),(693.7±99.9)pA,均为P<0.01;mEPSC的幅度:(34.7±4.7)vs(36.3±6.2),(36.2±4.4)pA,均为P>0.05]。BDNF与PTD-BDNF两者之间比较差异均无统计学意义(P>0.05)。结论:PTD-BDNF可以增强大鼠海马神经元兴奋性突触活动,说明重组PTD-BDNF与BDNF有相似的电生理活性。Objective: To study the effects of the brain-blood barrier permeable PTD-BDNF (protein transduction domain-brain derived neurotrophic factor) on the spontaneous neural discharge in the neurons of rat hippocampus. Methods: The whole cell patch clamp recording technique was used to observe the impact of PTD-BDNF and BDNF on the spontaneous synaptic activity of the cultured rat hippocampal neurons. Results: Compared with the control group, after treatment of hippocampal neurons with PTD-BDNF or BDNF, the frequency of the spontaneous excitatory post-synaptic current (sEPSC) and the miniature excitatory post-synaptic current (mEPSC) were significantly increased [ the frequency of sEPSC : ( 1.4 ± 0.5 ) vs (4. 0 ± 0.6), (3.9 ± 0.5 ) Hz, P 〈 0.01 ; the frequencyofmEPSC: (4.2±1.0) vs (7.9 ±1.9), (7.6 ±1.8) Hz, P〈0.01]. However, in spite of increment of the amplitude of sEPSC, the amplitude of mEPSC remained unchanged [ the amplitude of sEPSC:(415.7 ±48.0) vs (743.7±95.7), (693.7 ±99.9) pA, P〈0.01; the amplitude ofmEPSC:(34.7±4.7) vs (36.3 ±6.2), (36.2 ±4.4) pA, P 〉0.05 ]. The effect of PTD-BDNF was not significantly different from BDNF. Conclusion: PTD-BDNF can enhance the excitatory spontaneous synaptic activity of the rat hippocampal neurons. It implies that PTD-BDNF and BDNF shares the similar electrophysiological effects.

关 键 词:蛋白转导 脑源性神经营养因子 突触活动 膜片钳 海马神经元 

分 类 号:R963[医药卫生—微生物与生化药学] R338.8[医药卫生—药理学]

 

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