刺激面神经核对前包钦格复合体呼吸神经元放电活动的影响及其递质机制  

Effect of stimulation of the facial nucleus on discharge of respiratory neurons in the pre-Botzinger complex and its neurotransmitter mechanism in rats

作　　者：严亨秀[1] 张承武[1] 郑煜[1] 

机构地区：[1]四川大学华西基础医学与法医学院生理教研室,成都610041

出　　处：《生理学报》2004年第6期665-670,共6页Acta Physiologica Sinica

基　　金：supported by the National Natural Science Foundation of China(No.39970279);the Chinese Medical Board(CMB)of New York(No.82-412)

摘　　要：实验选用健康成年SD 大鼠,观察电刺激面神经核对前包钦格复合体(pre-B?tzinger complex, PBC)呼吸神经元(RNs)放电活动的影响,并观察微电泳 6- 氰基 -7- 硝基喹喔啉 -2,3- 二酮(CNQX)、荷包牡丹碱(BIC)、士的宁(Stry)和阿托品(Atr)对电刺激面神经核引起的PBC RNs 放电变化的拮抗效应,以进一步探讨面神经核是否参与呼吸调节及其可能的神经机制。在12 只面运动神经元逆行溃变大鼠同侧 PBC 内共记录到各类 RNs116 个,电刺激溃变侧面神经核时,前吸气(Pre-I)神经元(24/26 个)和吸气 ( I ) 神经元(30 /35 个)主要表现为兴奋,呼气( E )神经元(20 / 22 个)和吸气 - 呼气(I-E)跨时相神经元(28 / 33 个)表现为抑制。CNQX 可完全或部分拮抗电刺激面神经核对Pre-I(18 / 24) 和I(23 /27)神经元的兴奋效应; Stry可拮抗电刺激面神经核对Pre-I(12/18) 和I(14 /23)神经元的瞬时抑制效应以及对I-E(20/28)和E(9 /16)神经元的抑制效应;BIC 可拮抗电刺激面神经核对I-E(22 / 25)和E(9 / 9)神经元的抑制效应;微电泳Atr 对各类RNs 的放电变化无明显作用。这些结果表明,面神经核非运动神经元可能通过向 PBC 的纤维投射,以 Glu、GABA和 Gly 为神经递质或调质,调节 PBC RNs 的活动,从而参与对呼吸运动的调节。The experiments were carried out on adult Sprague-Dawley rats. We investigated the discharge response of respiratory neurons (RNs) in the pre-B?tzinger complex (PBC) to electrical stimulation of the facial nucleus in which the motor neurons were retrtogradely degenerated and the antagonistic effects of microiontophoresis of CNQX, bicuculline (BIC), strychnine (Stry) and atropine on the discharge responses of the neurons. In 12 rats with retrograde degeneration of the facial motor neurons, 116 RNs in the PBC ipsilateral to the facial nerve sectioned were extracellularly recorded. The response of pre-inspiratory (Pre-I) (24 / 26) and inspiratory (I) (30 / 35) neurons to the electrical stimulation of the facial nucleus was mainly excitatory, and the response of expiratory (E) (20 / 22) and inspiratory-expiratory phase-spanning (I-E) (28 / 33) neurons was mainly inhibitory. CNQX partially or completely block the excitatory effect of the stimulation on Pre-I (18 / 24) and I (23 / 27) neurons. Stry could partially or completely block the immediate transient inhibition on Pre-I(12 / 18) and I(14 / 23) neurons and the inhibitory effect on I-E (20 / 28) and E (9 / 16) neurons induced bythe stimulation. BIC partially or completely blocked the inhibitory effect on I-E (22 / 25) and E (9 / 9) neurons induced by the stimulation. Atropine did not have obvious influence on the response of RNs to the stimulation. These results suggest that non-motoneurons in the facial nucleus may participate in the modulation of respiration by affecting the activities of RNs in the PBC and that Glu, GABA and Gly serve as neurotransmitters or modulators to regulate the activities of the RNs in the PBC and hence the rhythmic respiratory movement.

关 键 词：面神经核 非运动神经元 前包钦格复合体 呼吸神经元 放电 递质 

分 类 号：Q473[生物学—生理学] R332.3[医药卫生—人体生理学]