激光诱导光动力效应对人癌细胞株及脐血单个核细胞体外作用的比较

目的　研究激光诱导的光动力效应对人癌细胞株的体外杀伤作用及对脐血单个核细胞的影响 ,以探讨自体外周血造血干细胞移植物的体外净化方法。方法　通过MTT法测定观察不同剂量光敏剂 (血卟啉衍生物 ,HPD)经激光照射不同时间后 ,对人白血病细胞株K5 62、乳腺癌细胞株MCF -7及脐血单个核细胞生长抑制作用的影响。结果　单纯光照对 3种细胞均无明显作用 ;单纯加光敏剂对K5 62细胞及MCF -7细胞有一定的抑制生长作用 ;激光照射加光敏剂可显著抑制K5 62细胞及MCF -7细胞的生长 ,且具有时间及浓度依赖性 ,但对脐血单个核细胞则无明显抑制作用。其细胞抑制率依次为K5 62细胞 >MCF -7细胞 >脐血单个核细胞。结论　激光诱导的光动力效应可能为恶性血液病或实体瘤患者的自体外周血造血干细胞移植物体外净化提供简便、有效且经济的方法 ,值得临床推广、应用。

The study of photodynamic effect induced by laser on human tumor cell lines and umbilical cord MNC in vitro

Objective To investigate the photodynamic effect induced by laser and use it as a method for purging of minimal residual tumor cells from autologous peripheral blood stem cell grafts. Methods We studied the effect of various concentrations of hematoporphyrin derivative (HPD) combined with of different time of laser irradiation on human leukemia cell line K562, breast tumor cell line MCF-7 and human umbilical cord blood-derived hematopoietic stem/progenitor cells by using MTT assay to compare the photodynamic effect between cell lines of each group. Results HPD or laser irradiation alone had no apparent cytotoxicity while the application of HPD plus laser exposure caused photosensitization. HPD plus laser irradiation was more efficient for killing K562 cells and MCF-7 cells than doing the normal human umbilical cord blood-derived hematopoietic stem/progenitor cells. The photodynamic effect on K562 cells and MCF-7 cells was positively correlated with the increase of treatment duration and HPD concentration. Conclusion These results indicated that the laser photodynamic effect mediated by HPD might be used for purging autologous peripheral blood stem cell grafts in vitro.