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HGF与CTLA-4Ig双基因修饰增强脐带间充质干细胞的免疫抑制和促增殖作用
Authors
Publication date
1 January 2012
Publisher
Editorial Office of Journal of Sun Yat-sen University
Abstract
【目的】 探讨人脐带间充质干细胞(hUCMSC)经肝细胞生长因子(HGF)和细胞毒性T细胞相关抗原4免疫球蛋白(CTLA4-Ig)双基因修饰后免疫调节能力的变化及其促进肝细胞增殖作用的影响。【方法】 酶联合消化法提取并鉴定人脐带间充质干细胞;对照组的hUCMSC转染携带绿色荧光蛋白(EGFP)基因的Ad5-EGFP,实验组的hUCMSC转染携带HGF和CTLA-Ig双基因的腺病毒Ad5-HGF/CTLA-4Ig。流式细胞仪检测对照组hUCMSC转染Ad5-EGFP后72 h表达EGFP细胞比率;实验组Ad5-HGF/CTLA-4Ig转染hUCMSC 72 h后,CCK8检测细胞存活率,同时再次检测hUCMSC免疫表型和向成骨细胞分化的能力,ELISA检测细胞上清中HGF含量,Western blot检测细胞中CTLA4-Ig蛋白的表达水平,通过CCK8法检测双基因修饰后hUCMSC对淋巴细胞增殖的影响及其上清对L02细胞增殖的影响。【结果】携带外源基因的腺病毒可有效转染hUCMSC,不影响其干细胞特性和多向分化能力,经HGF/CTLA-4Ig基因修饰hUCMSC可分泌高浓度HGF并高表达CTLA-4Ig,同时能有效地抑制淋巴细胞增殖,其上清能明显促进肝细胞增殖。【结论】 hUCMSC经HGF/CTLA-4Ig基因修饰后生物学特性无明显改变,并能高表达HGF和CTLA-4Ig,其免疫调节及促进肝细胞增殖的能力进一步加强,为肝移植术后存在的肝细胞损伤的保护治疗提供了新思路
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Last time updated on 15/10/2024