热化疗对Raji细胞体外增敏作用的实验研究

目的 观察热疗联合阿霉素对人B细胞淋巴瘤细胞系Raji细胞内的药物浓度变化及凋亡的影响.方法 MTT法确定阿霉素的工作浓度,以该浓度进行化疗或与热疗的联合,选择温度40℃、41℃及42℃,体外作用于Raji细胞.作用前及48 h采用台盼蓝拒染法检测肿瘤细胞的存活率;MTT法检测肿瘤细胞增殖的抑制作用;流式细胞仪检测肿瘤细胞的凋亡及细胞内药物浓度的变化.观察热疗联合阿霉素的抗肿瘤效果.结果 作用48 h IC50的药物浓度作为实验的工作浓度.热化疗组对Raji细胞有明显的抑制作用(P＜0.01),随着温度的增高而增强;热化疗组细胞内的药物浓度明显增加(P＜0.01).结论 热疗联合阿霉素能增加Raji细胞内的药物浓度,提高肿瘤细胞的凋亡率.

Thermotherapy enhances the sensitivity of lymphoma cell line Raji to chemotherapy in vitro

OBJECTIVE: To observe the effect of thermotherapy on the intracellular adriamycin concentration and apoptosis of Raji cells in vitro. METHODS: The working concentration of adriamycin against Raji cells was determined with MTT assay. Raji cells were subjected to thermotherapy (at 40 degrees Celsius;, 41 degrees Celsius; or 42 degrees Celsius;) and chemotherapy with adriamycin alone or in conjunction, and the cell survival rates were determined 48 h after the treatment. The cell growth inhibition effect of the treatment was evaluated with MTT assay, and the apoptotic rates of Raji cells and alteration of intracellular adriamycin concentration were determined by flow cytometry. RESULTS: The IC(50) of adriamycin was defined as the working concentration in the experiment. Thermotherapy at 40, 41 and 42 degrees Celsius; for 60 min in conjuction with chemotherapy significantly inhibited the growth of Raji cells (P<0.01). The results of flow cytometry showed that thermotherapy and adriamycin chemotherapy, used either alone or in combination, significantly increased the apoptotic rates of Raji cells (P<0.01), and thermotherapy remarkably increased the intracellular concentration of adriamycin. CONCLUSION: Adriamycin chemotherapy combined thermotherapy for 60 min can increase the intracellular concentration of adriamycin and the apoptosis rates of Raji cells.