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机构地区:[1]解放军第四二一医院神经外科,广州510318 [2]解放军第四二一医院急诊科,广州510318 [3]第二军医大学基础医学部生理学教研室,上海200433
出 处:《中华神经医学杂志》2014年第4期362-365,共4页Chinese Journal of Neuromedicine
基 金:国家自然科学基金(C30170908)
摘 要:目的观察静脉麻醉药丙泊酚对海马CAl区伤害相关性神经元电生理活动的影响,以了解其中枢抗伤害作用的相关机制。方法建立整体清醒制动大鼠模型,采用玻璃微电极细胞外记录的方法,观察丙泊酚(2mg/kg)静脉注射对大鼠海马CAl区神经元自发放电的影响。结果在海马CAl区共记录到55个神经元,鉴别出3类与外周伤害性刺激反应相关的神经元,即伤害兴奋性神经元(27个)、伤害抑制性神经元(13个)和伤害无关性神经元(15个)。静脉注射丙泊酚后,27个(100%)伤害兴奋性神经元的自发放电频率迅速降低,平均降幅84.8%;11个(84.6%)伤害抑制性神经元的自发放电频率迅速增加,平均增幅54.5%,另2个(15.4%)放电频率没有变化(变化幅度〈20%);3个(20%)伤害无关性神经元放电频率迅速增加,7个(46.7%)放电频率迅速减少,另5个(33.3%)放电频率没有变化。结论丙泊酚对海马CA1区伤害相关性神经元有明确的特异性调制作用,即抑制伤害兴奋性神经元的活性,而增强伤害抑制性神经元的兴奋性,这可能是其中枢抗伤害作用的机制之一。Objective To examine the effects of an intravenous general anaesthetics propofol on the discharges of nociceptive-related neurons in hippocampal CA1 area of rats, and to explore the mechanism of the antinociceptive action of propofol. Methods We established the models of extracellular recording of a single neuron of the hippocampal CA1 area in intact awake rats. Extracellular single-unit discharge recording technique was used to examine the effects ofpropofol (2 mg/kg) on the discharges of nociceptive-related neurons in hippocampal CA1 area. Results Of all the 55 neurons recorded in the CA1 area, three types were identified, namely nociceptive excitatory neurons (NENs, n=27), nociceptive inhibitory neurons (NINs, n=13) and nociceptive unrelated neurons (NUNs, n=15). Intravenous injection ofpropofol markedly lowered the discharge frequency for about 84.8% in 27 NENs, while significantly increased in 11 NINs (84.6%) for about 54.5%; and in 15 NUNs, 3 (20%) increased, 7 (46.7%) declined, while 5 (33.3%) showed no changes (amplitudes of variation〈20%) in the spontaneous discharge rates after the injection of propofol. Conclusion Propofol has specific modulation on nociceptive-related neurons in hippocampal CA1 area, which is, inhibiting the activity of the nociceptive excitatory neurons or enhancing the excitation of nociceptive inhibitory neurons; these may explain in part the mechanism of antinociceptive effects of propofol.
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