顺铂热化疗对骨肉瘤细胞株细胞毒性的实验研究

目的：研究顺铂热化疗对骨肉瘤细胞株(OS-732)细胞毒性的影响，探讨热疗在骨肉瘤顺铂化疗中增效作用的机理。方法：OS-732细胞株分别经不同温度的热疗、不同浓度顺铂化疗、43℃热疗 顺铂联合作用各1h，采用体外细胞毒性试验(MTT法)、流式细胞仪(FCM)分析及电子显微镜观察其对细胞毒性和细胞周期的影响，以及诱导细胞凋亡的情况。结果：41℃、43℃、45℃热疗对OS-732细胞株有明显的细胞毒性作用。在37℃恒温条件下，细胞株单独与不同浓度的顺铂作用1h，随着顺铂浓度的升高，其细胞毒性作用明显增加。43℃热疗 顺铂共同作用1h，其细胞毒性作用进一步增加，细胞毒性指数最高达72．37％；FCM分析显示对细胞周期有明显的影响，S期细胞比例明显增加，G2与M期细胞比例明显减少。43℃热疗、43℃热疗 顺铂联合作用各1h均出现凋亡细胞峰(亚G1峰)，细胞凋亡比例最高达56．47％；透射电镜观察有典型的细胞凋亡特征性变化。结论：顺铂热化疗有明显的增强OS-732细胞株的细胞毒性作用。43℃热疗、43℃热疗 顺铂均可诱导骨肉瘤细胞凋亡。43℃热疗诱导骨肉瘤细胞凋亡可能是热疗在骨肉瘤顺铂化疗中增效作用的潜在机制之一。

Cytotoxic effect of thermo-chemotherapy with cisplatin on osteosarcoma OS-732 cell line

OBJECTIVE: To observe the cytotoxic effect of thermo-chemotherapy with cisplatin on osteosarcoma OS-732 cell line and to explore its mechanism. METHODS: The osteosarcoma OS-732 cell line was treated with different temperature, cisplatin alone and 43 degrees C +cisplatin for 1 h, respectively and the in vitro cytotoxic effect was observed with MTT assay. The cell cycle and the apoptotic rate were analyzed with flow cytometry (FCM); the cellular apoptosis was observed also with electron microscope. RESULT: The cytotoxicity index increase markedly as the temperature elevated or the concentration of cisplatin increased. While treated with 43 degrees C hyperthermia and cisplatin simultaneously, the cytotoxicity index increased to 72.37%;the cell cycle of the treated OS-732 cells line was changed with marked increase in S phase and decreasing in G(2)/M phase. The apoptotic rate increased markedly with the highest of 56.47%. Electron microscope showed the characteristic apoptotic alterations. CONCLUSION: Hyperthermia with cisplatin enhance cytotoxicity on osteosarcoma OS-732 cell line and the induced cell apoptosis may be one of the mechanisms of enhanced cytotoxicity by thermo-chemotherapy.