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中国应用生理学杂志 ›› 2018, Vol. 34 ›› Issue (2): 137-142.doi: 10.12047/j.cjap.5554.2018.034

• 研究论文 • 上一篇    下一篇

右美托咪定对A549细胞缺氧/复氧损伤时细胞凋亡及CHOP的影响

罗梓垠1,2, 高慧1, 项冰倩1, 邱晓晓1, 戴雍月1, 王万铁1   

  1. 1. 温州医科大学缺血-再灌注损伤研究所, 浙江 温州 325035;
    2. 湖北省中西医结合医院病理科, 武汉 430015
  • 收稿日期:2017-01-16 修回日期:2017-10-27 出版日期:2018-03-28 发布日期:2018-05-22
  • 通讯作者: 王万铁 E-mail:wwt@wmu.edu.cn
  • 基金资助:
    浙江省公益技术应用研究项目(2013C33168);浙江省新苗人才计划项目(2014R413043);温州市公益性科技计划项目(Y20140652)

Effect of dexmedetomidine on apoptosis and CHOP in hypoxia/reoxygenation injury A549 cell

LUO Zi-yin1,2, GAO Hui1, XIANG Bing-qian1, QIU Xiao-xiao1, DAI Yong-yue1, WANG Wan-tie1   

  1. 1. Ischemia/Reperfusion Injury Research Institute of Wenzhou Medical University, Wenzhou 325035;
    2. Pathology Department of Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan 430015, China
  • Received:2017-01-16 Revised:2017-10-27 Online:2018-03-28 Published:2018-05-22
  • Supported by:
    浙江省公益技术应用研究项目(2013C33168);浙江省新苗人才计划项目(2014R413043);温州市公益性科技计划项目(Y20140652)

摘要: 目的:探讨右美托咪定(Dex)对缺氧/复氧所致的A549细胞(起源于肺泡Ⅱ型上皮细胞系)损伤及对CCAAT/增强子结合蛋白同源蛋白(CHOP)表达的影响。方法:将处于对数生长期的A549细胞随机分为4组(n=10):常氧培养组(N组),Dex常氧组(D组),缺氧/复氧组(H组),缺氧/复氧+Dex组(HD组)。D组和HD组在造模开始时加入1 nmol/L Dex,N组和D组细胞常氧培养30 h,H组和HD组细胞缺氧6 h,复氧24 h。之后用倒置显微镜观察细胞形态学变化。采用CCK-8法检测A549细胞活力。原位末端标记(TUNEL)法检测A549细胞的凋亡指数(AI)。蛋白免疫印迹法(Western blot)和逆转录-聚合酶链反应(RT-PCR)分别检测A549细胞CHOP、Grp78、caspase-3蛋白和CHOP、Grp78 mRNA表达水平。结果:与N组比较,H组细胞数量减少,细胞形态发生改变。A549细胞的吸光度值明显下降(P<0.01),AI值升高(P<0.01),凋亡细胞数明显增加。CHOP、Grp78、caspase-3蛋白和CHOP、Grp78 mRNA表达显著上升(P<0.01)。与H组相比,HD组细胞损伤减轻,吸光度值上调(P<0.01),凋亡细胞数明显减少(P<0.01)。CHOP、caspase-3蛋白,CHOP mRNA表达降低(P<0.01)。结论:Dex可有效减少缺氧/复氧引起的A549细胞凋亡,其机制可能与Dex对抗CHOP信号通路所致的凋亡有关。

关键词: CHOP, 右美托咪定, 缺氧/复氧损伤, A549细胞, 凋亡

Abstract: Objective:To investigate the effects of dexmedetomidine (Dex) on injury of A549 cells induced by hypoxia/reoxygenation(H/R)and the influence of C/EBP homologous protein (CHOP) expression. Methods:Logarithmic growth phase A549 cells(it originated from alveolar type Ⅱ epithelial cell line) were randomly divided into 4 groups (n=10):normoxic control group (N), Dex group (D), hypoxia/reoxygenation group (H), hypoxia/reoxygenation + Dex group(HD). At the beginning of modeling, 1 nmol/L Dex was puted into D and HD groups. N and D groups were cultured in the normoxic incubator for 30 h. H and HD group were incubated in the anoxic cultivation for 6 h, fo llowed by normoxic culture for 24 h. Then A549 cells were observed under the inverted microscope to observe the morphological changes. Cell activity was detected by cell counting Kit-8(CCK-8) and the apoptosis index(AI) was detected by in situ end labeling (TUNEL) method. The expression of CHOP、glucose-regulated protein of molecular weight 78 kDa (Grp78)、cysteinyl aspirate-specificprotease-3 (caspase-3) protein and CHOP、Grp78 mRNA were detected by Western blot and RT-PCR. Results:Compared with N group, the number of adherent cells in H group decreased significantly, and cell morphology changed. The absorbance value in H group decreased obviously (P<0. 01). The AI value and expression of CHOP, Grp78, caspase-3 proteins and CHOP, Grp78 mRNA were significantly increased (P<0.01). Compared with H group, the cell damage in HD group was decreased, the absorbance value increased (P<0.01), the number of apoptosis cells decreased relatively (P<0.01), the expression of CHOP, caspase-3 protein and CHOP mRNA decreased (P<0. 01). Conclusion:Dex has notable effects against H/R injury, which may be related to effective inhibition of apoptosis mediated by the CHOP's signal path.

Key words: CHOP, dexmedetomidine, hypoxia/reoxygenation injury, A549 cell, apoptosis

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