Objective:To evaluate protective effects of SS31 on early brain injury (EBI) induced by subarachnoid hemorrhage (SAH) in rats.Methods:A total of 96 Sprague-Dawley rats were randomly divided into 4 groups:A sham group,an SAH group,an SAH+vehicle group (SAH+V),and an SAH+SS31 group.The SAHinduced prechiasmatic cistern rat model was established in this study.Neurological deficit scores were evaluated at 24 h after SAH.The SS31 (5 mg/kg) as well as equal volume of vehicle were administrated intraperitoneally at 2 h after SAH.The neurological scores,brain edema,blood-brain barrier (BBB) permeability,apoptosis,malondialdehyde (MDA),glutathione peroxidase (GPx) activity,superoride dismutase (SOD) activity,and the expression ofcytosolic cytochrome c (Cyt C) and Bax were analyzed at 24 h after SAH.Results:Treatment with SS31 could significantly reduce MDA levels,and restored the activities of GPx and SOD in the cortex following SAH when compared with the SAH+V group.In addition,Bax SS31 trearment increased or decreased the levels of mitochondrial Cyt C or Bax,respectively.Moreover,SS31 treatment ameliorated brain edema and Evans blue dye extravasation,improved neurological deficits,and decreased neuronal apoptosis at 24 h after SAH.Conclusion:SS31 could alleviate EBI after SAH through its antioxidant property and ability in inhibition of neuronal apoptosis.%目的:探讨SS31对蛛网膜下腔出血(subarachnoid hemorrhage,SAH)后早期脑损伤(early brain injury,EBI)的保护作用.方法:将96只大鼠随机分为假手术组(Sham)、SAH组、SAH+vehicle组(SAH+V)、SAH+SS31组.建立大鼠视交叉池SAH模型,术后2h经腹腔注射SS31(5mg/kg)或等体积的溶剂.在SAH后24 h,分析不同组间大鼠神经功能评分、脑水肿、伊文思蓝的渗出、细胞凋亡、丙二醛(malondialdehyde,MDA)、超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(glutathione peroxidase,GPx)、细胞色素(cytochrome c,Cyt C)及Bax表达水平的差异.结果:与SAH+V组比较,SS31治疗能显著降低SAH后大鼠脑组织中MDA水平,提高GPx和SOD活性,上调线粒体CytC表达水平,降低Bax表达水平,脑水肿和伊文思蓝的渗出减轻,改善大鼠神经功能缺损,减少神经元凋亡.结论:SS31可减轻SAH后EBI,其机制可能与抗氧化应激和抑制神经元凋亡有关.
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