【摘要】 本研究探讨抗CD20单克隆抗体体外诱导B淋巴细胞株凋亡情况及其可能的作用机制。体外培养Daudi、Ramos、Namalwa和Raji细胞,采用XTT法测定细胞增殖抑制率;用流式细胞术测定细胞凋亡;Western blot测定Daudi、Ramos、Raji和Namalwa细胞经Rituximab20μg/ml作用24小时后Bcl-2的表达情况。结果表明:抗CD20单克隆抗体对Daudi、Raji和Namalwa淋巴瘤细胞有轻度的抗增殖作用,对Ramos细胞无抗增殖作用,抗增殖作用与单克隆抗体作用浓度无关。抗CD20单克隆抗体对4株细胞无明显诱导凋亡作用,抑制率在3%-10%之间波动。Na-malwa和Raji细胞株经抗CD20单克隆抗体作用24小时后,Bcl-2蛋白表达下调。结论:单药抗CD20单克隆抗体对Daudi、Namalwa和Raji细胞株有轻度抗细胞增殖作用,但与作用浓度和作用时间无明显相关。单药抗CD20单克隆抗体对Daudi、Namalwa、Raji和Ramos细胞株有微弱的诱导凋亡作用。Namalwa和Raji细胞株经抗CD20单克隆抗体作用24小时后Bcl-2表达下调,这可能是抗CD20单克隆抗体增敏细胞毒药物作用的机制之一。更多还原

【Abstract】 The aim of this study was to investigate the effect of anti-CD20 monoclonal antibody (McAb) on induction of apoptosis in malignant B cell lines in vitro and to explore its possible mechanism. The human Burkitt′s lymphoma cell lines (Daudi, Namalwa, Raji and Ramos cells) were cultured in vitro. The inhibitory rate of cell proliferation was detected by XTT assay, the apoptosis of cells was determined by flow cytometry. The expression of BCL-2 in human Burkitt′s lymphoma cell lines (Daudi, Namalwa, Raji and Ramos cells) treated with rituximab(20 μg/ml) for 24 hours was analyzed by Western blot. The results showed that the anti-CD20 McAb had a slight anti-proliferation effect on the Daudi, Namalwa, Raji cell lines and no effect on the Ramos cell line. There is no correlation between the effect and the concentration of anti-CD20 McAb. Anti-CD20 McAb as a single agent could weakly induce the apoptosis of four cell lines. The inhibitory rate of cell proliferation ranged from 3% to 10%. Expression of BCL-2 protein was down-regulated after treated by anti-CD20 McAb for 24 hours in Raji and Namalwa cell lines. It is concluded that the anti-CD20 McAb as a monomer can slightly inhibit the proliferation of Daudi, Namalwa and Raji cell lines, the inhibition does not dependent on the treating time and the concentrations of anti-CD20 McAb. Anti-CD20 McAb as a monomer can weakly induce the apoptosis of four cell lines. Expression of BCL-2 in Raji and Namalwa cell lines is down-regulated after the cells were treated by anti-CD20 McAb for 24 hours. Down-regulation of BCL-2 expression may be one of the mechanisms enhancing the cytotoxicity of cytotoxic drugs.更多还原