摘要目的 研究血卟啉衍生物光动力治疗(photodynamic therapy,PDT)对体外培养的人胰腺癌细胞株PANC1的杀伤效应及其规律.方法 以Biolitec PDT 630半导体激光治疗仪为光源,用不同浓度的血卟啉衍生物Photosan(0.5、1、2、4 mg/L)作为光敏剂孵育PANC1细胞8 h后,分别给予不同剂量(1、5、10 J/cm~2)630nm激光照射,用MTT法测定PDT后各组的A_(492)值,以流式细胞仪测定10 J/cm2光照后细胞凋亡情况.结果 不加光敏剂Photosan或不进行光照,对细胞均无杀伤效应;添加1 mg/LPhotosan时,10 J/cm~2 的光照对细胞产生杀伤效应(0.140±0.013对0.213±0.008,P＜0.05);添加2 mg/L Photosan时,5 J/cm~2 和10 J/cm~2 的光照对细胞产生杀伤效应(0.081±0.024和0.049±0.013对0.211±0.031,P＜0.05和P＜0.01);添加4 mg/L Photosan时,所有光照剂量均对细胞产生明显的杀伤效应.但5 J/cm~2与10 J/cm~2光照对细胞的杀伤效应无显著差异.用10J/cm~2光照,0、2、4mg/LPhotosan时的细胞凋亡率分别为(13.8±1.8)%、(40.9±1.6)%、(62.5±2.0)%,差别具有统计学意义(P＜0.05).结论 单纯给予光敏剂或光照对PANC1均不产生PDT效应.光敏剂达到一定浓度,光照达到一定剂量后,PDT效应随其增加而增强.

abstractsObjective To investigate the killing effect of hematoporphyrin derivative photedynamic therapy (PDT) on cultured human pancreatic cancer cell,and to explore the mechanism of this effect.Methods Biolitec PDT 630 semi-conductor laser therapeutic apparatus was used as the light source.After pancreatic cancer cell PANC1 was incubated 8 h with different concentrations of Photosan(hematoporphyrin derivative) as photosensitizer (0.5mg/L,1 mg/L,2 mg/L,4 mg/L),the cells were given different doses of 630nm laser irradiation(1 J/cm2' 5 J/cm~2,10 J/cm~2 ).The A492 value was determined in each group with MTT method.Cell apoptosis rate was detected by flow cytometry after PDT.Results There was no killing effect when no Photosan was administrated;10 J/cm~2 irradiation had killing effect on PANC1 when Photosan was administrated as 1 mg/L(0.140±0.013 vs 0.213±0.008,P＜0.05);5 and 10 J/cm~2 irradiation all had killing effect on PANC1 when Photosan was administrated as 2 mg/L (0.081±0.024 and 0.049±0.013vs 0.211±0.031,P＜0.05 and P＜0.01 );all doses of irradiation had killing effect when Photosan was administrated as 4 mg/L.There was no significant difference between 5 and 10 J/cm~2 irradiation in term of killing effect.Cell apoptosis rates with 0 or 2 or 4 mg/L Photosan and 10 J/cm~2 irradiation were(13.8±1.8) %,(40.9±1.6)%,(62.5±2.0)%,the difference was statistically significant(P＜0.05).Conclusions Photosensitizer or irradiation alone did not produce PDT effect.With certain dose of photosensitizer and irradiation,the PDT effect increased accordingly.