目的：探讨5-HT2A受体在大鼠睡眠呼吸暂停发生中的作用。方法：对自由活动的Sprague-Dawley （SD）大鼠进行睡眠呼吸监测。通过Western blot 免疫印记法检测SD大鼠脑干5-HT2A受体的表达水平，并分析其与睡眠呼吸暂停指数的相关性。结果：SD 大鼠呈现出两种呼吸暂停模式：叹息后呼吸暂停（post-sigh sleep apnea， PS）和自发性呼吸暂停（spontaneous apnea， SP）。总呼吸暂停指数（AI）与脑干5-HT2A受体表达量成负相关（r＝0．672， P＜0．001）。 PS指数与脑干5-HT2A表达量成负相关（r＝0．686，P＜0．001），非快动眼睡眠期（NREM）的PS 指数与脑干5-HT2A表达量也成负相关（r＝0．663，P＜0．001）。而总 SP 指数以及不同睡眠时期的SP指数均与5-HT2A受体表达量无相关性（P＞0．05）。结论：5-HT2A受体表达量与大鼠叹息后睡眠呼吸暂停的严重程度呈负相关。5-HT2A受体可能参与了呼吸中枢兴奋性的调节及睡眠呼吸暂停的发生。%Objective To investigate the correlationship of 5-HT2A receptor expression in the brainstem and sleep apnea in Sprague-Dawley (SD)rat. Method PSG monitoring for sleep and sleep apneas scoring was performed in freely moving SD rats. The level of 5-HT2A protein in rat brainstem was detected by Western blot and the relationship of 5-HT2A level with sleep apneas was analyzed. Results Two types sleep apnea model were obtained in rats, one was post-sigh sleep apnea (PS) and the other was spontaneous apnea (SP). The sleep apnea index was negatively correlated with the amount of 5-HT2A receptor level in brainstem (r=0.672,P <0.001). The post-sigh sleep apnea index was negatively correlated with the amount of 5-HT2A level in brainstem (r=0.686, P<0.001). The NREM-PS index was also negatively correlated with the amount of 5-HT2A level in brainstem (r =0.663, P < 0.001),but the spontaneous apnea index was not correlated with the amount of 5-HT2A level in brainstem (P>0.05). Conclusion The expression of 5-HT2A receptor in brainstem was negatively correlated with the severity of post-sigh sleep apnea. This association implies that 5-HT 2A receptor plays a critical role in the respiratory network and is closely correlated with the occurrence of central sleep apneas.
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