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地皮菜中一种新型水应激蛋白基因的克隆表达及其抗人结肠癌细胞SW480的作用

郭松佳,单树花,晋小婷,李宗伟,宋 莉,李卓玉   

  1. 1.化学生物学与分子工程教育部重点实验室,山西大学生物技术研究所,山西 太原 030006;2.山西医科大学汾阳学院
    医学检验系,山西 汾阳 032200;3.太原师范学院生物系,山西 太原 030031
  • 出版日期:2014-07-15 发布日期:2014-07-18

Cloning and Expression of a Novel Water Stress Protein from Nostoc commune Vauch. and Its Inhibitory Effect on the Proliferation of Human Colon Cancer SW480 Cells

GUO Song-jia, SHAN Shu-hua, JIN Xiao-ting, LI Zong-wei, SONG Li, LI Zhuo-yu   

  1. 1. Laboratory for Chemical Biology and Molecular Engineering, Ministry of Education, Institute of Biotechnology, Shanxi University,
    Taiyuan 030006, China; 2. Department of Medical Laboratory, Fenyang College of Shanxi Medical University, Fenyang 032200,
    China; 3. Department of Biology, Taiyuan Normal University, Taiyuan 030031, China
  • Online:2014-07-15 Published:2014-07-18

摘要:

利用聚合酶链式反应(polymerase chain reaction,PCR)扩增出地皮菜(Nostoc commune Vauch.)一种新型水应激蛋白(water stress protein,WSP)的基因(GenBank 序列号:KF003026),连接到原核表达载体pET28a上,测序鉴定后转化入大肠杆菌BL21,获得一种新型水应激蛋白表达工程菌;经异丙基-β-D-硫代半乳糖苷(isopropyl-β-D-thiogalactopyranoside,IPTG)诱导表达及镍离子亲和层析柱(Ni-NTA)纯化后,得到了带6×His标签、分子质量大小为40 kD的可溶性目的蛋白,称其为重组水应激蛋白1(recombinant water stress protein 1,Re-WSP1)。细胞增殖抑制实验结果表明,Re-WSP1蛋白可以抑制结肠癌细胞SW480的增殖,而对正常结肠上皮FHC细胞无明显作用;DAPI细胞核染色结果表明,该蛋白能够诱导SW480细胞凋亡小体的形成;Western blotting结果显示,Re-WSP1蛋白能够促进Procaspase-3和Procaspase-8的活化剪切。以上结果表明:Re-WSP1蛋白能够明显的抑制结肠癌SW480细胞的增殖,并可能通过Caspase依赖途径诱导SW480细胞凋亡。

关键词: 地皮菜, 重组水应激蛋白, 表达与纯化, 结肠癌, 细胞凋亡

Abstract:

Water stress protein (WSP) gene was amplified by polymerase chain reaction (PCR) from the Nostoc commoune
Vauch. genome (Genbank NO. KF003026), and cloned into the prokaryotic expression vector pET28a. After being
sequenced, the recombinant plasmid pET28a-WSP was transformed into E.coli BL21, and recombinant water stress protein 1
(Re-WSP1) was induced to express by isopropyl-β-D-thiogalactoside (IPTG). The soluble 6 × histidine (His)-tagged fusion
Re-WSP1 was further purified by Ni+-NTA affinity chromatography. The molecular weight of the fused Re-WPS1 was 40 kD
as expected. When applied to cells in culture, Re-WSP1 could significantly suppress the growth of SW480 colon cancer
cells, but had a negligible effect on that of FHC normal colon epithelial cells. In addition, Re-WSP1-treated SW480 cells
displayed the apoptotic characteristics of chromatin condensation and typical fragmented nuclei, as demonstrated by DAPI
staining. Re-WSP1 could also activate procaspase-8 and procaspase-3, resulting in their cleavage into active fragments.
Taken together, Re-WSP1 has shown obvious anti-colon cancer effects on SW480 cells, and induced apoptosis by caspasedependent
pathway in SW480 cells.

Key words: Nostoc commune Vauch., recombinant water stress protein 1 (Re-WSP1), expression and purification, colon cancer, cell apoptosis