目的：探讨孕期酒精暴露对子代新生大鼠延髓脑片基本节律性呼吸放电（rhythmic respiratory discharge activity, RRDA）的作用。方法制作包含面神经后核内侧区（the medial region of the nucleus retrofacialis, mNRF）并保留舌下神经根的新生大鼠离体延髓脑片标本，给予灌流改良的Kreb's液（modified Kreb's solution, MKS），使用吸附电极记录延髓脑片腹侧面舌下神经根RRDA，分析RRDA的变化。实验分为5组：对照组、4%酒精暴露组、6%酒精暴露组、8%酒精暴露组和10%酒精暴露组，研究孕期不同浓度酒精暴露对RRDA的作用。结果对照组、4%酒精暴露组、6%酒精暴露组、8%酒精暴露组各组组内RRDA在50 min内吸气时程（TI）、呼吸频率（RF）、放电积分幅度（IA）无统计学差异，10%酒精暴露组RRDA节律不规整；与对照组相比，4%~10%酒精暴露组的RRDA随酒精浓度增加逐渐降低，TI缩短、RF下降、IA减弱。结论孕期酒精暴露抑制子代新生大鼠延髓脑片舌下神经根RRDA，这可能是孕期酒精暴露抑制子代呼吸功能的基础。%Objective To investigate the effects of prenatal alcohol exposure on rhythmic respiratory discharge activity (RRDA) in the medullary slices of neonatal rats. Methods Ten pregnant female SD rats were exposed to 0, 4%, 6%, 8%, and 10%alcohol in drinking water from 1 week before till 3 days after delivery. The medullary slices of the neonatal rats containing the medial region of the nucleus retrofacialis (mNRF) with the hypoglossal nerve rootlets were prepared and perfused with modified Kreb's solution to record RRDA from the hypoglossal nerve rootlets using suction electrodes. Results No significant difference was found in RRDA in 50 min among the neonatal rats with prenatal exposure to 0, 4%, 6%, and 8%alcohol, but the RRDA in 10%alcohol exposure group became irregular. Prenatal exposure to increased alcohol concentrations caused attenuated RRDA attenuated in the neonatal rats, shown by shortened inspiratory time (TI), decreased respiratory frequency (RF), and reduced integral amplitude (IA) as compared with those in the control group. Conclusion Prenatal alcohol exposure inhibits RRDA in medullary slices of neonatal rats, which might be a mechanism by which maternal alcohol exposure causes suppressed offspring respiratory functions.
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