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辐射诱导表达载体pEgr-hTRAIL的构建及其对肿瘤细胞的体外诱导凋亡作用

朴春姬1,田 梅1,刘林林2,杨 巍1,李修义1*   

  1. 1. 吉林大学公共卫生学院 卫生部放射生物学重点实验室,吉林 长春130021;2. 吉林大学第二医院放疗科,吉林 长春130041
  • 收稿日期:2004-11-05 修回日期:1900-01-01 出版日期:2005-03-28 发布日期:2005-03-28
  • 通讯作者: 李修义

Construction of pEgr-hTRAIL expression vector inducedby irradiation and its apoptosis in tumor cells in vitro

PIAO Chun-ji1,TIAN Mei1,LIU Lin-lin2, YANG Wei1,LI Xiu-yi1*   

  1. 1. MH Radiobiology Research Unit, School of Public Health, Jilin University,Changchun 130021,China;2. Department of Radiotherapy, Second Hospital, Jilin University, Changchun 130041, China
  • Received:2004-11-05 Revised:1900-01-01 Online:2005-03-28 Published:2005-03-28
  • Contact: LI Xiu-yi

摘要: 目的:构建携带人肿瘤坏死因子相关凋亡诱导配体(hTRAIL)基因的辐射诱导表达载体pEgr-hTRAIL,并研究其在人肺腺癌细胞株A549中的表达及促凋亡作用。 方法:采用常规分子生物学方法构建表达质粒pEgr-hTRAIL,体外通过脂质体转染A549细胞,经G418筛选稳定转染细胞A549-shTRAIL,利用逆转录聚合酶链反应(RT-PCR)法检测目的基因的表达,采用Annexin-V-FITC凋亡检测试剂盒检测细胞早期凋亡。 结果:经限制性内切酶酶切鉴定pEgr-hTRAIL表达质粒构建正确;稳定转染细胞A549-shTRAIL的hTRAIL mRNA表达量明显增加;稳定转染细胞A549-shTRAIL的凋亡细胞百分数明显增加,是A549细胞的1.8倍(P<0.05)。 结论:成功构建pEgr-hTRAIL表达质粒,体外稳定转染细胞A549-shTRAIL具有明显诱导凋亡作用。

关键词: pEgr-hTRAIL表达载体, 基因表达, 细胞凋亡

Abstract: Objective To construct the radiation-inducible expression vector pEgr-hTRAIL containing human TNF related apoptosis inducing ligand (hTRAIL) gene and study its expression and function of inducing apoptosis in A549 human lung adenocarcinoma cells. Methods Expression vector pEgr-hTRAIL was constructed with DNA recombinant technique. pEgr-hTRAIL plasmids were packaged with lipofectin to transfect into A549 cells in vitro. Stably transfected cell line A549-shTRAIL was selected through G418. The expression of hTRAIL gene was detected by RT-PCR. The early stage apoptosis of A549 cells was detected by Annexin-V-FITC apoptosis detecting kit. Results Expression vector pEgr- hTRAIL was constructed correctly by identification with restriction enzyme digestion. The expression of hTRAIL mRNA in stably transfected cell line A549-shTRAIL was increased significantly. The percentage of apoptotic A549-shTRAIL was increased significantly; it was 1.8 times as much as A549 cells (P<0.05). Conclusion Expression vector pEgr-hTRAIL is constructed successfully,which can increase the apoptosis of the stably transfected cell line A549-shTRAIL significantly.

Key words: pEgr-hTRAIL expression vector, gene expression, apoptosis

中图分类号: 

  • Q782