激光激发5-氨基乙酰丙酸己酯对人红白血病耐药/非耐药细胞株的杀伤效应研究

目的探讨5-氨基乙酰丙酸己酯-光动力疗法(He-ALA-PDT)对人红白血病细胞株K562及其耐阿霉素细胞株K562/ADM的杀伤效应。方法实验设4组:PDT组(加光敏剂并接受光照)、激光组(不加光敏剂只接受光照)、暗毒性组(只加光敏剂而不接受光照)、正常对照组(不加光敏剂且不接受光照)。用不同浓度(0.025、0.1、0.4、1.6mmol/L)的He-ALA避光孵育细胞,给予不同功率密度(4.5、9、18、36J/cm2)的630nm波长激光照射后,继续培养12h,观察细胞形态学变化,以CCK8法测定细胞存活率,采用甲基纤维素培养体系分析白血病细胞克隆形成能力的变化。结果暗毒性组、激光组均未对细胞产生明显杀伤作用,而PDT组能明显杀伤白血病细胞,且细胞存活率随He-ALA浓度和激光功率密度的增加而降低,且在相同条件下,K562细胞的存活率显著低于K562/ADM细胞(P<0.05)。PDT组的集落形成率明显低于正常对照组(P<0.001),且与K562/ADM细胞相比,K562细胞的集落形成率降低程度更为显著(P<0.001)。结论He-ALA-PDT可杀伤K562、K562/ADM细胞,并显著降低白血病细胞的克隆形成能力;K562/ADM细胞对PDT的反应不如K562细胞敏感。

Killing effect of laser irradiated hexyl 5-aminolevulinate on human erythroleukemia cell line K562 and drug-resistance cell line K562/ADM

Objective To investigate the photodynamic therapy(PDT)of human erythroleukemia cell line K562 and drug-resistance cell line K562/ADM using hexyl 5-aminolevulinate(He-ALA)in vitro.Methods Four groups were set:PDT group(photosensitizer with light irradiation),laser group(light irradiation only),dark-cytoxocity group(photosensitizer only)and normal control group(neither photosensitizer nor light irradiation).K562 cells and K562/ADM cells cultured were incubated with various concentrations of He-ALA(0.025,0.1,0.4 and 1.6mmol/L)for 4 hours,then illuminated with different light doses(4.5,9,18 and 36 J/cm2)using a laser with a wave length of 630nm.After 12 hours incubation,Wright's staining method was used to observe the cell's morphological changes,the survival rates of cells were analyzed by CCK8 assay,and the changes in colony-forming abilities of cells were analyzed by methylcellulose colony-forming assay.Results He-ALA or light irradiation alone had no evident cytotoxicity,while the application of He-ALA plus light irradiation effectively killed the leukemia cells.With the increase of the concentrations of He-ALA and the dosages of irradiation,the viability of cells decreased.Under the same conditions,the survival rate of K562 was significantly lower than that of K562/ADM(P<0.05).The rate of colony-forming in PDT group was significantly lower than that in normal control group(P<0.001).After PDT,the rate of colony-forming of K562 decreased more significantly than that of K562/ADM(P<0.001).Conclusions He-ALA-PDT can effectively kill K562 and K562/ADM cells and depress the colony-forming abilities of leukemia cells,although K562/ADM cells are less sensitive to He-ALA-PDT than K562 cells.