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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[J]. 中山大学学报(医学科学版), 2012,33(6).
Enhanced Immunomodulatory and Pro-proliferation Properties of Human Umbilical Cord Mesenchymal Stem Cells Modified by HGF-gene and CTLA-4Ig-gene[J]. Journal of Sun Yat-sen University (Medical Sciences), 2012, 33(6).
【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。
【Objective】 To determine whether the human umbilical cord mesenchymal stem cells (hUCMSC) transfected with adenovirus carrying hepatocyte growth factor (HGF) and cytotoxic T-lymphocyte-associated antigen 4 immunoglobulin (CTLA-4Ig) genes still preserve immunosuppressive function as well as pro-proliferation activity. 【Methods】 hUCMSC were isolated from Wharton's Jelly tissue by combined enzymatic digestion and identified by immunophenotype and differentiation capacity analysis. The hUCMSC in experimental group were transfected by adenovirus-5 carrying HGF and CTLA4-Ig genes (Ad5-HGF/CTLA-4Ig) and the hUCMSC in control group were transfected by adenovirus-5 containing EGFP gene (Ad5-EGFP). Expression of EGFP and cell survival rate of hUCMSC transfected with Ad5-EGFP and Ad5-HGF/CTLA-4Ig were tested by Fluorescence Activating Cell Sorter and CCK8. Then the immunophenotye and differentiation capacity of hUCMSC (HGF/CTLA-4Ig) were further tested after adenoviruses transfection. The expression of HGF and CTLA-4Ig was assessed by ELISA and Western blot 72 h after hUCMSC adenoviral transfection. The proliferation ability of L02 cell by the condition medium of hUCMSC (HGF/CTLA-4Ig) and the suppression to T lymphocyte proliferation by hUCMSC (HGF/CTLA-4Ig) were tested by CCK8 analysis. 【Results】 The double genes modified hUCMSC preserved the same immunophenotype and differentiation capacity as un-transfected hUCMSC. The expression of HGF and CTA-4Ig genes in hUCMSC transfected with Ad5-HGF/CTLA-4Ig could be detected 72h after transfection. Proliferation test showed that the condition medium of hUCMSC (HGF/CTLA-4Ig) can significant improve the proliferation of L02 cell. When co-cultured with hUCMSC(HGF/CTLA-4Ig), the T lymphocyte proliferation was inhibited and the inhibition rate was hUCMSC (HGF/CTLA-4Ig) dosage-dependent. 【Conclusion】 hUCMSC modified by Ad5-HGF/CTLA-4Ig have the same immunophenotye and differentiation capacity as those untransfected cells. The hUCMSC transfect with HGF/CTLA-4Ig genes can efficiently suppress the proliferation of T cells but promote L02 proliferation by HGF and CTA-4Ig expression.
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