PSD-007对宫颈癌Hela细胞光动力杀伤效应的剂量学研究

目的 探讨癌光啉（PSD-007）对人宫颈癌Hela细胞体外光动力杀伤效应及主要影响因素.方法 不同质量浓度（0、3.125、6.25、12.5、25、50、100 μg/ml）的PSD-007与Hela细胞共同孵育2h后,予以不同能量（0、0.6、1.2、2.4、4.8、9.6 J/cm2）635 nm波长的激光照射,以相同剂量光照和光敏剂剂量的人乳腺癌细胞系MCF-7光动力杀伤作用做对比,通过噻唑蓝（MTT）比色法测定细胞的光密度（OD）值及存活率;质量浓度为12.5 μg/ml的PSD-007与细胞共同孵育2h后,以不同能量（1.2、2.4、4.8 J/cm2）的激光照射,流式细胞术（FCM）分析细胞周期及凋亡率.结果 与空白对照组相比,单纯光敏剂PSD-007在＞25 μg/ml质量浓度下影响Hela细胞存活率,光动力疗法（PDT）对Hela细胞有更明显的杀伤效应,并且随着光敏剂质量浓度增加和光照能量密度增大,对细胞的杀伤效果逐渐增强.当光敏剂质量浓度＞12.5 μg/ml,光照能量＞4.8 J/cm2时,各组间细胞存活率的差异无统计学意义（P＞0.05）.FCM分析发现,PDT于G0/G1期阻断Hela细胞生长,凋亡诱导作用呈时间依赖性.结论 光敏剂PSD-007自身对体外人宫颈癌细胞系Hela细胞具有生长抑制作用,PSD-007介导的光动力杀伤效应更为显著,较人乳腺癌-7（MCF-7）细胞的PSD-007光动力作用有更低的使用剂量和光照剂量.

Dosimetry study on photodynamic effect of PSD-007 on human cervical cancer cell line Hela

Objective To investigate the photochemotherapeutic effect and the main affecting factors of PSD-007 on human cervical cancer Hela in vitro.Methods Hela cells were treated with different concentrations of PSD-007 （0,3.125,6.25,12.5,25,50,100 μg/ml） for 2 h under the influence of low-level laser （635 nm） therapy at different doses （0,0.6,1.2,2.4,4.8,9.6 J/cm2）.Then the OD values and survival rates of Hela cells were measured by MTT assay compared with breast cancer cells MCF-7 in same treatment.Hela cells were treated with 12.5 μg/ml of PSD-007 for 2 h and were treated with different intensities of laser （1.2,2.4,4.8 J/cm2）.The cellular apoptosis rate and cell cycle phase distribution of Hela were measured by a flow cytometry （FCM）.Results Survival rates of Hela cells declined with more than 25 μg/ml of PSD-007 only,and significant difference in the inhibitory between the PDT group and control group was observed （P＜0.05）.The survival rates of Hela after PDT was decreased by the concentration of sensitizer and dose of laser.There were no significant differences of cell survival rates among the groups with concentrations more than 12.5 μg/ml and laser energy density more than 4.8 J/cm2.The FCM assay showed a G0/G1 cell cycle arrest in a time-dependent manner.Conclusions PSD-007 has a photodynamic effect on Hela in vitro.Photodynamic effect of PSD-007 was more significant in Hela than MCF-7.Less photosensitizer and laser energy density were needed.