HIF-1α抑制剂对大鼠局部脑缺血再灌注损伤的影响
首发时间:2009-01-09
摘要:目的 研究大鼠局部性脑缺血再灌注损伤时,HIF-1α抑制剂(2ME2)对损伤脑组织的影响。 方法 雄性SD大鼠随机分为假手术组、大脑中动脉阻塞再灌注组(MCAO组)、假性治疗组(DMSO组)、2ME2治疗组(2ME2组)。治疗组在术后1h腹腔注射相应剂量药物。观察各组大鼠神经行为学缺陷;再灌注7d,TTC染色观察脑梗死体积变化;再灌注24h,Western Blot检测HIF-1α及其下游基因的表达变化;制备脑组织切片分别作Nissl染色、免疫组化染色及TUNEL标记。 结果 2ME2组神经功能较MCAO及DMSO组有明显改善(P<0.05),同时2ME2治疗可以明显减小梗死面积(P<0.05)。Western Blot结果显示HIF-1α的表达经2ME2治疗后降低,其下游基因VEGF、BNIP3及Caspase-3的表达有同样的变化。Nissl染色可见2ME2治疗组皮质神经元结构较清晰,胞体肿胀、核固缩、核溶解程度较模型组及假性治疗组明显减轻,淡染区域减小;免疫组化法观察到2ME2组HIF-1α、Caspase-3、BNIP3、VEGF及TUNEL标记的阳性细胞数明显减少(P<0.05)。 结论 2ME2可能通过降低HIF-1α水平并下调其下游的BNIP3和VEGF的表达,从而降低血脑屏障的通透性并减少凋亡因子Caspase-3的作用而发挥神经元保护作用。
关键词: 脑缺血 缺氧诱导因子-1α 凋亡 免疫组织化学染色 大鼠
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THE EFFECT OF HIF-1αINHIBITOR ON THE INJURY INDUCED BY FOCAL CEREBRAL ISCHEMIA AND REPERFUSION IN RATS
Abstract:[Abstract] Objective To investigate the effect of hypoxia-inducible factor-1α (HIF-1α) inhibitor(2ME2) on the injury induced by focal cerebral ischemia. Methods Male SD rats were randomly divided into four groups: Control (sham surgery), Middle Cerebral Artery Occlusion and Reperfusion(MCAO), MCAO treated with vehicle(DMSO), MCAO treated with 2ME2. 2ME2 was injected intraperitoneally at 1h after operation. We observed the neurological deficits in different groups. Rats were sacrificed in 7 d for TTC staining and in 24 h for Western blot, nissl staining, immunohistochemical and TUNEL studies. Results 2ME2 improved neurological deficits(P<0.05), reduced the infarct area (P<0.05), inhibited the neuronal deformation shown by nissl staining and reduced the expression of HIF-1α, activated Caspase-3, BNIP3 and VEGF detected by Western Blot and immunohistochemical staining. Conclusion 2ME2 is a powerful agent to protect brain from cerebral ischemic injury by inhibiting HIF-1α activity, attenuating the superfluous expression of VEGF which results in the protection of BBB permeability, suppressing neuronal apoptosis via BNIP3 pathway.
Keywords: Cerebral ischemia HIF-1 Apoptosis Immunohistochemical staining Rat
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