吉林大学学报(医学版)

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高压氧对大脑中动脉阻塞模型大鼠脑组织中Mcl-1表达的影响及其脑组织损伤作用机制

陆玉熊,康劲松,王伟伟,杨晓春,王修深,孙连坤   

  1. (吉林大学白求恩医学院病理生理学系,吉林 长春 130021)
  • 收稿日期:2013-03-14 出版日期:2013-09-28 发布日期:2013-09-28
  • 通讯作者: 孙连坤 E-mail:(Tel:0431-85619402,E-mail:sunlk@jlu.edu.cn)
  • 作者简介:陆玉熊(1988-),男,云南省巧家县人,在读医学硕士,主要从事自噬与细胞死亡方面研究。
  • 基金资助:

    国家自然科学基金资助课题(81272876);吉林省科技厅科研基金资助课题(201015200)

Influence of hyperbaric oxygen in MCl-1 expression in  brain tissue of rat MCAO models and mechanism of its brain tissue injury effect

LU Yu-xiong,KANG Jin-song,WANG Wei-wei,YANG Xiao-chun,WANG Xiu-sheng, SUN Lian-kun
   


  1. (Department of Pathophysiology,Norman Bethune College of Medicine,Jilin University,Changchun 130021,China)
  • Received:2013-03-14 Online:2013-09-28 Published:2013-09-28

摘要:

目的: 探讨高压氧(HBO)对大脑中动脉阻塞(MCAO)模型大鼠脑组织抗凋亡蛋白髓细胞白血病因子1(Mcl-1)表达的影响,阐述高压氧对受损脑组织的损伤作用机制。 方法: 随机选取20只健康雄性Wistar大鼠,分为假手术(Sham)组6只、模型(MCAO)组和HBO组各7只。采用线栓法制作MCAO模型。Sham组仅进行血管分离,MCAO组缺血90 min进行再灌注,HBO组在MCAO组的基础上,于再灌注3 h时,给予3.0绝对大气压(ATA)高压纯氧治疗1 h;所有大鼠于再灌注24 h后处死。取脑组织冠状切片,用1%红四氮唑(TTC)染色检测并计算梗死面积;取大脑皮层梗死边缘区组织提取RNA和蛋白质,采用RT-PCR法检测Mcl-1 mRNA表达水平,Western blotting法检测Mcl-1蛋白表达水平。 结果: 与MCAO组比较,HBO组大鼠脑梗死面积比明显增加(P<0.01)。与Sham组比较,MCAO组大鼠脑组织中Mcl-1 mRNA表达水平显著升高(P<0.01);与MCAO组比较,HBO组大鼠脑组织中Mcl-1 mRNA表达水平显著升高(P<0.01)。与Sham组比较,HBO组和MCAO组大鼠脑组织中的Mcl-1蛋白表达水平显著降低(P<0.01);HBO组与MCAO组Mcl-1蛋白表达水平比较差异无统计学意义(P>0.05)。与MCAO组比较,HBO组Bax/Mcl-1水平明显升高(P<0.01)。 结论:  高压氧可能通过促进Mcl-1的降解,引起Bax/Mcl-1平衡失调,导致神经细胞凋亡而加剧组织损伤。

关键词: 压氧, 大脑中动脉阻塞, 梗死边缘区, 髓细胞白血病因子1, 细胞凋亡

Abstract:

To explore the effect of hyperbaric oxygen(HBO) on brain tissue of rats suffered transient middle cerebral artery occlusion (MCAO) and  the Mcl-1 expression in brain cortex,and to demonstrate its mechanism. Methods 20 healthy male Wistar rats were chosen and separated randomly to  sham group(n=6),MCAO group(n=7) and  HBO group(n=7).The MCAO models were established by nylon strand method.In sham group,the blood vessels were dissected and the strand was not inserted to middle artery;the rats in MCAO group were reperfused after 90 min ischemia,and the rats in HBO group were given pure oxygen at 3.0 atmospheres absolute (ATA) for 60 min after 3 h  reperfusion.24 h after reperfusion,all the rats were killed.The infarct area of coronal brain section was calculated with 2,3,5-triphenyltetrazolium chloride (TTC) staining;the expressions of Mcl-1 mRNA and protein in cortex of penumbra were detected by RT-PCR and Western blotting,respectively.Results  Compared with MCAO group,the infarct area  ratio of the rats in HBO group was increased obviously (P<0.01).Compared with sham group, the Mcl-1 mRNA level in brain tissue of the rats in MCAO group was up-regulated notably(P<0.01).Compared with MCAO group,the Mcl-1 mRNA level in brain tissue of the rats  in HBO group was raised significantly(P<0.01). Compared with sham group,the Mcl-1 protein contents in brain tissue of the rats in MCAO and HBO groups were  decreased significantly (P<0.01);but there were no statistically significant differences(P>0.05).Compared with MCAO group,the Bax
/Mcl-1 levels in HBO group were increased significantly (P<0.01).Conclusion
HBO may promote the damage of MCAO rats through increasing the degradation of Mcl-1.

Key words: hyperbaric oxygen;middle cerebral artery occlusion;marginal zone myeloid cell leukemin-1, apoptosis

中图分类号: 

  • R840.511