基础医学与临床 ›› 2014, Vol. 34 ›› Issue (1): 16-21.

• 研究论文 • 上一篇    下一篇

敲低Txnip抑制高糖诱导的人肾小管细胞株凋亡

韦金英1,史永红2,任蕴卓1,侯延娟1,杜春阳1,张连珊1,段惠军2   

  1. 1. 河北医科大学
    2. 河北医科大学病理学教研室
  • 收稿日期:2013-04-17 修回日期:2013-06-21 出版日期:2014-01-05 发布日期:2013-12-26
  • 通讯作者: 段惠军 E-mail:duanhj@hebmu.edu.cn
  • 基金资助:
    自发性高血压大鼠心、脑、肾和肠系膜微动脉缝隙连接特性的比较研究》国家自然科学基金(国家自然科学基金);自发性高血压大鼠心、脑、肾和肠系膜微动脉缝隙连接特性的比较研究》国家自然科学基金(国家自然科学基金);河北省自然青年科学基金;河北省自然科学基金;高等学校博士学科点专项科研基金

Txnip interference on HG-induced human kidney proximal tubular cell line apoptosis

  • Received:2013-04-17 Revised:2013-06-21 Online:2014-01-05 Published:2013-12-26

摘要: 目的 观察敲低Txnip对高糖诱导人肾小管上皮细胞凋亡的影响。方法 将体外培养人肾小管上皮细胞分为正常糖组、高糖组、高糖+质粒载体对照组及高糖+shRNA组。采用原位末端转移酶标记技术(TUNEL)检测细胞凋亡;流式细胞术检测细胞ROS水平;Western blot检测caspase-3、cleaved caspase-3、Bax、Bcl-2、P38 MAPK、P-P38MAPK及细胞色素c的表达。结果 与正常糖组相比,高糖组肾小管上皮细胞ROS产生和细胞凋亡明显增加(P<0.01),cleaved caspase-3和P-P38 MAPK表达增高,Bax/Bcl-2比率明显升高以及细胞色素c易位(P<0.05)。敲低Txnip能够显著抑制高糖诱导的肾小管上皮细胞凋亡和ROS产生,下调cleaved caspase-3、和P-P38 MAPK的表达,减少Bax/Bcl-2比率和细胞色素c易位(P<0.05)。 结论 敲低Txnip能够抑制高糖诱导的人肾小管上皮细胞凋亡可能是通过减少ROS产生,保护线粒体功能,抑制P38MAPK信号通路激活而实现的。

关键词: 糖尿病肾病, 氧化应激, 人肾小管上皮细胞, 凋亡, 线粒体

Abstract: Objective To investigate the effect of Txnip interference on high glucose (HG)-induced apoptosis in human kidney proximal tubular cell line (HK-2). Methods Cultured HK-2 were divided into normal glucose group(NG),high glucose group (HG), HG+contol plasmid vector(HG+C) and GH+ VDUP1 shRNA Plasmid (h) (HG+shRNA).Apoptosis of HK-2 was analyzed by DeadEnd? Fluorometric TUNEL System. ROS production was observed by flow cytometry. The expression levels of Txnip, caspase-3, cleaved caspase-3, Bax, Bcl-2, P38 MAPK, P-P38 MAPK and cytochrome c protein were observed by Western blot. The expression levels of Txnip, Bax, Bcl-2mRNA were observed by RT-PCR. Results Compared with normal glucose group (NG), the production of ROS, the number of cell apoptosis, the expression of cleaved caspase-3 and P-P38 MAPK, ratio of Bax/Bcl-2 and the release of cytochrome c from mitochondria to cytoplasm significantly increased in HK-2 in high glucose group (HG)(P<0.05). Txnip interference inhibited HG-induced ROS production, cell apoptosis, expression of cleaved caspase-3 and P-P38 MAPK, ratio of Bax/Bcl-2 and release of cytochrome c from mitochondria to cytoplasm in HK-2(P<0.05). Conclusions: Txnip interference can prevent HG-induced HK-2 apoptosis through decreasing ROS production, preserving mitochondrial function and inhibiting activation of P38 MAPK.

Key words: diabetic nephropathy, oxidative stress, human kidney proximal tubular cell line, apoptosis, mitochondria

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