Abstract
目的探讨CD19 CAR-T细胞培养过程中其PD-1蛋白、mRNA水平及细胞杀伤活性变化。方法收集6例外周血PD-1高表达恶性淋巴瘤患者、6例健康志愿者的外周血T细胞,作为CAR-T培养的T细胞来源。流式细胞术检测PD-1蛋白表达、PCR法检测PD-1 mRNA水平,CCK-8法检测细胞增殖,LDH法检测细胞杀伤活性。结果①PD-1高表达患者T细胞来源CD19 CAR-T细胞,与志愿者T细胞来源者相比,转染率无差异(P>0.05);②PD-1高表达T细胞来源CAR-T细胞与PD-1抑制剂联合与否,以及健康志愿者CAR-T之间,细胞增殖差异无统计学意义(P>0.05);③PD-1高表达T细胞与CAR-T细胞对淋巴瘤细胞株杀伤活性,低于二者联合PD-1抑制剂及志愿者CAR-T细胞(P<0.001),而PD-1高表达T细胞来源CAR-T细胞联合PD-1抑制剂与健康志愿者CAR-T细胞间差异无统计学意义(P>0.05);④各组细胞培养过程中PD-1表达均下降,差异无统计学意义(P>0.05),但各组细胞培养过程中,PD-1 mRNA的变化差异无统计学意义(P>0.05);⑤PD-1高表达T细胞来源CAR-T收获后,与PD-1抑制剂共培养与否,其PD-1表达差异无统计学意义(P>0.05),但CAR-T与淋巴瘤细胞株接触后,其PD-1表达随培养时间延长而增高,加入PD-1抑制剂可拮抗该作用;各组间PD-1 mRNA的变化差异无统计学意义(P>0.05)。结论PD-1高表达T细胞来源CAR-T细胞与肿瘤细胞接触后,其PD-1表达随培养时间延长而增高;而包括PD-1抑制剂在内,不能改变其PD-1 mRNA的表达。
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