硼替佐米诱导ABCG_2~(High)耐药鼻咽癌细胞高表达NKG2D配体的实验研究

目的 探讨硼替佐米诱导高表达ABCG2耐药鼻咽癌细胞对Allo-NK细胞杀伤敏感性的机制.方法 利用免疫磁珠技术分离ABCG2High CNE2/DDP细胞及Allo-NK细胞,流式细胞技术检测分离后细胞纯度及经硼替佐米处理前后靶细胞NKG2D配体表达率,LDH释放测定法检测经硼替佐米处理前后ABCG2HighCNE2/DDP细胞对Allo-NK细胞的杀伤敏感性.结果 ABCG2HighCNE2/DDP细胞分离后ABCG2表达率为(91.40±2.32)%,分选后NK细胞CD3-CD16+CD56+细胞的纯度达90%以上.经硼替佐米处理之后靶细胞MICA、MICB、ULBP1、ULBP2、ULBP3表达率,由药物处理之前的(2.92±0.33)%、(4.27±0.33)%、(5.80±0.62)%、(11.10±3.15)%、(7.75±1.14)%分别上升到(17.52±2.04)%、(12.53±3.68)%、(15.24±2.91)%、(62.02±6.85)%、(35.69±3.23)%.在效靶比为10:1、20:1、Allo-NK细胞对硼替佐米处理前后ABCG2HighCNE2/DDP细胞的杀伤率分别为(15.32±13.86)%、(27.26±6.81)%及(35.06±5.10)%、(52.34±4.78)%.处理前后杀伤率差异有统计学意义(F=26.03,P=0.000).结论 硼替佐米通过诱导肿瘤细胞高表达NKG2D配体(MICA/B、ULBP1-3),使肿瘤细胞对Allo-NK细胞的杀伤敏感性增强.

Induction of Expression of Ligands for NKG2D Receptor in ABCG_2~(High) Nasopharyngeal Carcinoma by Bortezomib

Objective To investigate the mechanism on the effects of improving cytotoxic sensitivity of ABCG2High CNE2/DDP cells to Allo-NK cells which exerted by bortezomib.Methods ABCG2HighCNE2/DDP cells and Allo-NK cells were isolated by magnetic activated cell sorting(MACS).Flow cytometry was used to evaluate the purity of isolated cells and the expression of NKG2D-ligands on target cells before and after incubation with bortezomib.Subsequently,the cytotoxic sensitivity of treated and un-treated ABCG2High CNE2/DDP ...