实用器官移植电子杂志 ›› 2018, Vol. 6 ›› Issue (5): 375-379.DOI: 10.3969/j.issn.2095-5332.2018.05.008

• 论著 • 上一篇    下一篇

流式细胞术检测供体猪 α-1,3-Gal 和人源CD46 的表达

杜敏杰 1,2,魏静 2,臧荣鑫 1,潘登科 1,2   

  • 出版日期:2018-09-20 发布日期:2021-06-24

Flow cytometry detection of donor porcine α-1,3-Gal and human CD46 expression

  • Online:2018-09-20 Published:2021-06-24

摘要:

目的 检测基因修饰猪细胞表面 α-1,3- 半乳糖(α-Gal)抗原敲除情况和人源蛋白 CD46 (hCD46)的表达情况,为异种器官移植提供可靠的供体。方法 采集 500 μl 野生型(wild type,WT)、 α-1,3- 半乳糖基转移酶基因敲除(GTKO)、hCD46 和 GTKO/hCD46 巴马小型猪血液,分离外周血单核细 胞(peripheral blood mononuclear cell,PBMC)。异硫氰酸荧光素标记的植物凝集素(FITC-GSIB4)与 PBMC 共孵育后采用流式细胞术检测 α-Gal 抗原敲除情况,异硫氰酸荧光素标记的 hCD46 膜辅蛋白抗体(antiCD46-FITC)与 PBMC 共孵育后采用流式细胞术检测 hCD46 蛋白表达情况。结果 GTKO 和 GTKO/hCD46 巴 马猪 PBMC 表面 α-Gal 检测呈阴性,WT 和 hCD46 巴马猪检测呈阳性,与测序结果一致 ;hCD46 和 GTKO/ hCD46 巴马猪 PBMC 表面 hCD46 蛋白检测呈阳性,WT 和 GTKO 巴马猪检测呈阴性,与 PCR 鉴定结果一致。 结论 建立了微量血液流式细胞术直观检测供体猪 α-Gal 抗原和人源 CD46 蛋白表达的方法。

Abstract:

Objective To detect the reliability of α-1,3-galactosyl(α-Gal)antigen knockout and the expression of human protein CD46(hCD46)on the surface of genetically modified pigs at the protein level, to provide reliable donors for xenotransplantation. Methods A total of 500 μl blood from wild type(WT),α-1,3-galactosyl transferase knockout(GTKO),hCD46 and GTKO/hCD46 Bama miniature swine were collected for peripheral blood mononuclear cell(PBMC)isolation. Expression of α-Gal antigen was detected by flow cytometry after coincubation with fluorescein isothiocyanate-Griffonia simplicifolia isolectin B4(FITC-GSIB4)and PBMC. Expression of hCD46 protein was detected by flow cytometry after co-incubation of PBMC with fluorescein isothiocyanate-CD46 membrane protein antibody(anti-CD46-FITC). Results The α-Gal expression on the surface of PBMC were negative in GTKO and GTKO/hCD46 Bama pigs and positive in WT and hCD46 Bama pigs,consistent with the sequencing results. The hCD46 protein was detected positively on the surface of PBMC of hCD46 and GTKO/hCD46 Bama pigs and was negative in WT and GTKO Bama pigs,which was consistent with the results of genotype identification after birth. Conclusion A method for visually detecting the expression of α-Gal antigen and hCD46 protein in donor porcine using microscale blood was established.