首都医科大学学报 ›› 2017, Vol. 38 ›› Issue (1): 42-46.doi: 10.3969/j.issn.1006-7795.2017.01.009

• 脑血管病、认知障碍的基础及临床研究 • 上一篇    下一篇

常压高浓度氧下调电压依赖性阴离子通道蛋白对脑缺血-再灌注损伤大鼠的保护作用

师文娟, 戚智锋, 刘克建   

  1. 首都医科大学宣武医院 北京市老年病医疗研究中心 脑血管病研究室, 北京 100053
  • 收稿日期:2016-11-28 出版日期:2017-01-21 发布日期:2017-01-20
  • 通讯作者: 刘克建 E-mail:kliu@salud.unm.edu
  • 基金资助:
    国家自然科学基金项目(81620108011,81571175),北京市科技新星项目(Z141107001814045)资助。

Normobaric hyperoxia protect cerebral ischemia/reperfusion injured rats by downregulating voltage-dependent anion channel protein

Shi Wenjuan, Qi Zhifeng, Liu Kejian   

  1. Xuanwu Hospital, Capital Medical University, Beijing Geriatric Medical Research Center, Cerebrovascular Diseases Research Institute, Beijing 100053, China
  • Received:2016-11-28 Online:2017-01-21 Published:2017-01-20
  • Supported by:
    This study was supported by National Natural Science Foundation of China (81620108011,81571175), Beijing Nova Program (Z141107001814045).

摘要: 目的 观察常压高浓度氧治疗(normobaric hyperoxia,NBO)对脑缺血-再灌注大鼠电压依赖性阴离子通道蛋白(voltage-dependent anion channel,VDAC)以及凋亡蛋白细胞色素C(cytochrome C,CytC)和活化型半胱天冬酶-3(cleaved caspase-3)的影响,初步探讨其作用机制。方法 将15只健康成年雄性SD大鼠(280~320 g)采用数字表法分为3组:假手术组(Sham)、正常氧浓度组(Normoxia)和NBO组,采用线栓法制备大鼠大脑中动脉阻塞模型,模型大鼠缺血1.5 h,再灌注24 h。Sham组和Normoxia组大鼠术后呼吸普通空气,NBO组大鼠术后至再灌注前呼吸100%常压氧气。采用Western blotting方法,检测脑缺血半影区VDAC、CytC和cleaved caspase-3蛋白的表达变化。结果 1)与Sham组相比,Normoxia组缺血侧半影区VDAC显著升高(P<0.05);与Normoxia组相比,NBO组缺血侧半影区VDAC显著降低(P<0.05);2)与Normoxia组相比,NBO组缺血侧半影区凋亡蛋白CytC和cleaved caspase-3显著减少(P<0.05)。结论 NBO治疗可能通过调节缺血侧半影区电压依赖性阴离子通道蛋白VDAC的表达来抑制脑缺血诱发的细胞凋亡,从而实现脑神经保护作用。

关键词: 脑缺血-再灌注, 常压高浓度氧, 电压依赖性阴离子通道蛋白, 凋亡

Abstract: Objective To observe the effect of normobaric hyperoxia (NBO) on expression of voltage-dependent anion channel (VDAC), cytochrome C (CytC) and cleaved caspase-3 induced by cerebral ischemia-reperfusion injury in rats, and preliminarily explore the mechanism of NBO treatment on prevention of apoptosis. Methods Fifteen healthy adult male Sprague-Dawley (SD) rats (280-320 g) were divided randomly into three groups:Sham group (n=3), Normoxia group (n=6) and NBO group (n=6). A model operation of MCAO was performed using intraluminal suture method. The rats underwent MCAO for 1.5 h plus 24 h reperfusion. After model operation the rats of sham group and normoxia group breathed normal air, and instead NBO group rats breathed 100% oxygen until reperfusion. Western blotting was used to test the expression of VDAC, CytC and cleaved caspase-3 protein in ischemic penumbra region. Results Western blotting results showed that compared with the sham group, the VDAC protein expression of ischemic penumbra was increased (P<0.05) in the normoxia group, and compared with the normoxia group, the expression of VDAC protein in ischemic penumbra region was statistically significantly reduced (P<0.05) in NBO group. Compared with the normoxia group, the expressions of CytC protein and cleaved caspase-3 protein in ischemic penumbra region were statistically significantly decreased (P<0.05) in NBO group. Conclusion NBO treatment may inhibit cerebral ischemia-induced apoptosis by downregulating the excessive expression of voltage-dependent anion channel protein in ischemic penumbra region, thus to play a protective role in the ischemia/reperfusion injured brain.

Key words: cerebral ischemia-reperfusion, normobaric hyperoxia(NBO), voltage-dependent anion channel(VDAC), apoptosis

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