人源白细胞介素21对外周血及脐血来源CIK细胞产生和抗肿瘤活性的作用研究

目的：研究新近发现的免疫调节因子——白细胞介素21（IL-21）对外周血及脐血来源的CIK细胞产生及抗肿瘤活性的体外作用。方法：采集分离正常人的外周血及脐血单个核细胞，加用细胞因子诱导培养CIK细胞，在有无人源IL-21（200ng／μl）培养条件下，检测CIK细胞表达及杀伤K562细胞和急性白血病患者肿瘤细胞活性的变化；检测培养上清IFN-γ的浓度及杀伤活性以及RT-PCR法检测培养细胞的IFN-γ RNA表达的不同。结果：在人源IL-21的作用下，培养14天时，①CIK细胞的产生由17．5％升至26．5％（外周血来源）；33．8％升至55．9％（脐血来源）。②CIK细胞对K562细胞的杀伤作用由24．0％升至52．2％（外周血来源）；35．1％升至79．7％（脐血来源）；脐血来源CIK细胞对13例急性白血病患者肿瘤细胞杀伤作用由27．4％升至58．3％。③外周血来源培养上清IFN-γ的浓度上升了近一倍，对K562的杀伤作用增加了近一倍；脐血来源培养上清IFN-γ的浓度上升了三倍多，对K562的杀伤作用增加了近二倍；④外周血和脐血来源培养细胞的IFN-γ RNA表达均明显增高。结论：人源IL-21可增加外周血及脐血来源CIK细胞产生及增强其抗肿瘤活性，通过增加IFN-γ的表达产生为其作用机制之一，提示IL-21在增强肿瘤免疫治疗中具有潜在的临床应用前景。

Effects of humanized interleukin 21 on the production and anti-tumor activity of cytokine induced killer cells derived from both peripheral and cord blood

Objective:To explore the effects of humanized interleukin 21(IL-21)on induction and anti-tumor activity of cytokine inducing killer(CIK)cells derived from both peripheral blood(PB)and cord blood(CB)in vitro.Methods:Mononuclear cells from peripheral and cord blood were separated.The cells were cultured with cytokines to induce CIK cells at the condition.with or without humanized IL-21(200 ng/ml).Quantity of CIK cells and the cytotoxic activity against either K562 cells or leukemia cells from patients were me...