中国组织工程研究 ›› 2013, Vol. 17 ›› Issue (37): 6641-6644.doi: 10.3969/j.issn.2095-4344.2013.37.016

• 组织构建基础实验 basic experiments in tissue construction • 上一篇    下一篇

真核表达载体pcDNA3-ICOSIg的构建及表达

赵国华1,张  睿2,许国岩3,王冬梅4   

  1. 辽宁省肿瘤医院,1胃外科,2大肠外科,辽宁省沈阳市  110042;3沈阳市铁西区华康医院外科,辽宁省沈阳市  110026;4辽宁陆军预备役高射炮一师三团,辽宁省沈阳市  110048
  • 收稿日期:2013-01-19 修回日期:2013-04-24 出版日期:2013-09-10 发布日期:2013-09-10
  • 作者简介:赵国华☆,男,1975年生,辽宁省丹东市人,汉族,2006年中国医科大学毕业,博士,副主任医师,主要从事普通外科基础与临床研究。 zgh1975070707@163.com
  • 基金资助:

    辽宁省人社厅百千万人才工程资助项目(2011921027)*;辽宁省科技厅博士启动基金资助项目(20081032)*

Construction and expression of eukaryotic expression vector pcDNA3-ICOSIg

Zhao Guo-hua1, Zhang Rui2, Xu Guo-yan3, Wang Dong-mei4   

  1. 1Department of Gastric Surgery, 2Department of Colorectal Surgery, Liaoning Cancer Hospital, Shenyang  110042, Liaoning Province, China;3Department of Surgery, Huakang Hospital of Shenyang, Shenyang  110026, Liaoning Province, China;4Regiment 3, Division 1 Anti-aircraft Artillery, Liaoning Army Reserve, Shenyang  110048, Liaoning Province, China
  • Received:2013-01-19 Revised:2013-04-24 Online:2013-09-10 Published:2013-09-10
  • About author:Zhao Guo-hua☆, M.D., Associate chief physician, Department of Gastric Surgery, Liaoning Cancer Hospital, Shenyang 110042, Liaoning Province, China zgh1975070707@163.com
  • Supported by:

    Hundred Talents Project of Liaoning Provincial Department of Human Resources and Social Security, No. 2011921027*; Doctoral Initiating Fund of Science and Technology Department of Liaoning Province, No. 20081032*

摘要:

背景:人可诱导共刺激分子(ICOS)是迄今发现的重要共刺激分子家族成员,可促进激活T细胞的增殖和分泌、调节Th1/Th2细胞的极化、增强依赖T细胞的B细胞功能,阻断ICOS共刺激信号会导致T细胞的克隆失活或克隆无反应,从而诱导肿瘤对机体的免疫逃逸。
目的:构建表达ICOSIg的质粒,观察其在小鼠体内的表达。
方法:克隆编码ICOS的胞外片段,将其与编码小鼠免疫球蛋白IgG恒定片段(Ig)的基因融合,构建ICOSIg融合基因及其分泌型真核表达载体pcDNA3-ICOSIg,酶切鉴定重组子,测序,利用阳性脂质体载体包被pcDNA3-ICOSIg转染小鼠右侧大腿肌肉组织,Western blot法检测血清ICOSIg水平。
结果与结论:经测序鉴定证实pcDNA3-ICOSIg质粒目的基因片断与Genbank上公布的ICOS序列完全一致,说明质粒构建成功。脂质体载体包被pcDNA3-ICOSIg转染小鼠7 d,在小鼠血清中检测到ICOSIg的阳性表达,说明pcDNA3-ICOSIg能够在小鼠肌细胞内表达。证实利用基因合成和重组技术可成功构建真核表达载体pcDNA3-ICOSIg。

关键词: 组织构建, 组织构建基础实验, 真核表达, 肿瘤, 共刺激信号, 人可诱导共刺激分子, 免疫球蛋白, 质粒, 基因转染, 省级基金

Abstract:

BACKGROUND: So far, inducible co-stimulator is the important costimulatory molecule family member. Inducible co-stimulator can promote the activation of T cells proliferation and secretion, regulate Th1/Th2 cell polarization dependence, enhance B cell function which depend on the T cells. So, blocking the inducible co-stimulator may result the inactivation and no reaction of cloning in T cells, thus inducing the immune escape of tumor on the body.
OBJECTIVE: To build a plasmid expression of inducible co-stimulator Ig, in order to observe the expression in rat body. 
METHODS: cDNA encoding the extracellular domain of human inducible co-stimulator was prepared. The encode of the domain was fused with the gene of immunoglobulin IgG constant fragment (Ig) of encoding mouse, in order to build the inducible co-stimulator Ig fusion gene and the secreted eukaryotic expression vector pcDNA3-inducible co-stimulator Ig. Enzyme digestion of the recombinant and sequencing was performed, and then the positive liposome coated pcDNA3-inducible co-stimulator Ig was transferred into the muscle tissue of mouse right thigh. Western blot was used to detect the level of inducible co-stimulator Ig.
RESULTS AND CONCLUSION: The sequencing confirmed that the size of target gene fragment pcDNA3- inducible co-stimulator Ig plasmid was exactly the same with the sequence of inducible co-stimulator published on Genebank, which indicated the successful of plasmid construction. After transferred into the mouse for 7 days, the liposome coated pcDNA3-inducible co-stimulator Ig was positively expressed in the mice serum, which showed that pcDNA3-inducible co-stimulator Ig could be expressed in the rat muscle cells. The results suggest that gene synthesis and recombinant technology can successfully construct the eukaryotic expression vector pcDNA3-inducible co-stimulator Ig.

Key words: transfection, neoplasms, inducible T-cell co-stimulator protein, plasmid

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