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Effect of stimulation of the facial nucleus on discharge of respiratory neurons in the pre-B(``o)tzinger complex and its neurotransmitter mechanism in rats
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- Author:
- No author available
- Journal Title:
- ACTA PHYSIOLOGICA SINICA
- Issue:
- 6
- DOI:
- 10.3321/j.issn:0371-0874.2004.06.002
- Key Word:
- 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
Abstract： 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-Botzinger 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.
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