目的 探讨M4型瞬时受体电位通道(TRPM4)在蛛网膜下腔出血(SAH)大鼠模型中对脑血流量自主调节障碍的作用.方法 选择清洁级健康雄性SD大鼠120只,按随机数字表法分为假手术、SAH、阴性对照及治疗组,剔除死亡大鼠.采用立体定向仪鞍上池注射法建立SAH模型,分别向假手术组和阴性对照组注射等渗盐水0.2 ml,分别向SAH组和治疗组注射自体尾动脉血0.2 ml.通过置入式微量泵分别向假手术组和SAH组大鼠的侧脑室持续泵入等渗盐水,向阴性对照组和治疗组持续泵入浓度为0.03 mol/L的TRPM4阻滞剂(9-Phenanthrol),4组大鼠分别于第3、5和7天接受大脑皮质局部血流量和全脑血流量的检测.结果 120只SD大鼠中共有106只(88.3%)存活至研究时间点,4组分别以21只大鼠(各时点分别为7只)进行数据分析.第3、5、7天,假手术、SAH、阴性对照和治疗组大脑皮质局部和全脑血流量的差异均有统计学意义(均P<0.05);SAH组皮质局部血流量[第3、5、7天分别为(141±18)、(148±24)、(168±19)PU]和全脑血流量[第3、5、7天分别为(93±5)、(85±5)、(85±6) ml/(100 g·min)]均较假手术组[皮质局部:(235±17)、(220±24)、(224±20)PU,全脑:(141±10)、(147±8)、(143±8) ml/100 g·min]明显降低 (均P<0.05),治疗组大脑皮质局部和全脑血流量[皮质局部:(183±26)、(173±26)和(187±15)PU,全脑:(114±10)、(104±9)和(119±5) ml/(100 g·min)]均较SAH组明显增加(均P<0.05).结论 TRPM4对改善SAH后脑血流自主调节障碍有明显作用.%Objective To investigate the effect of transient receptor potential M4 (TRPM4) on autonomous regulation disorder of cerebral blood flow following subarachnoid hemorrhage (SAH) in rats.Methods A total of 120 clean grade male SD rats were selected.They were divided into sham operation,SAH,negative control,and treatment groups according to the random number table.The dead rats were excluded.A SAH model was induced by using the suprasellar cistern injection method with a stereotaxic apparatus.Isotonic saline 0.2 ml was injected into the rats of the sham operation group and negative control group respectively,and autologous tail arterial blood 0.2 ml was injected into the rats of the SAH group and the treatment group respectively.The isotonic saline solution was continuously pumped into lateral ventricle of rats via implantable micro-pump in the sham operation group and the SAH group respectively,and the concentration of 0.03 mol/L of TRPM4 blocking agent was continuously pumped into the lateral ventricles of rats in the control group and the treatment group respectively.The 4 groups of rats received the regional cerebral blood flow and whole cerebral blood flow detection on day 3,5,and 7,respectively.Results One hundred and six (88.3%) of the 120 SD rats survived to the time point of study,data analyses were performed in the 4 groups (with 21 rats in each group) respectively (n=7 in each time point).There were significant differences in cerebral cortex local and whole cerebral blood flow at day 3,5,and 7 in the sham operation,SAH and negative control groups (all P<0.05).Cerebral cortex local cerebral blood flow (141±18,148±24,and 168±19 PU,respectively at day 3,5,and 7) and whole cerebral blood flow (93±5,85±5,and 85±6 ml/[100 g·min],respectively at day 3,5,and 7 in the SAH group) were decreased significantly compared with the sham operation group (cortex local cerebral blood flow:235±17,220±24,and 224±20 PU),whole cerebral blood flow (141±10,147±8,and 143±8 ml/[100 g·min]),all P<0.05).Cerebral cortex local and whole cerebral blood flow (cortical local cerebral blood flow:183±26,173±26,and 187±15 PU,whole brain:114±10,104±9,and 119±5 ml/(100 g·min) in the treatment group were significantly increased compared with the SAH group (all P<0.05).Conclusion TRPM4 has an obvious effect on improving the autonomous regulation disorder of cerebral blood flow after SAH.
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