竹红菌乙素-PDT与血卟啉衍生物-PDT对人肺癌细胞杀伤效应的比较研究

Comparative study on the killing effect between hypocrellins B-photodynamic therapy and hematoporphyrin derivative-photodynamic therapy on human lung cancer cells

目的 探讨竹红菌素 光动力疗法 (HB PDT)对肺癌细胞的杀伤效应 ,并与第一代光敏剂血卟啉衍生物 (HpD)进行比较。方法 以不同浓度的竹红菌乙素 (HB)及HpD孵育细胞 ,然后分别在铜蒸汽激光混合光饱和光剂量条件下进行照光处理 ,照光后置于 37℃、5 %CO2 的孵箱中继续孵育 2 4h ,用MTT法分别测定不同浓度下的细胞存活率 ,绘制杀伤曲线并拟合曲线方程 ,根据方程求出不同光敏剂对细胞的半数杀伤浓度 (IC50 )。结果 HB PDT对肺癌细胞株具有很强的杀伤效应 ,其IC50 为 33 82ng/ml,而HpD对肺癌细胞株的IC50 为 1316 88ng/ml,二者比较差异有统计学意义 (P <0 0 1)。结论 HB PDT对肺癌细胞株的杀伤效应明显优于HpD PDT ,是一种对肿瘤细胞杀伤所需浓度范围小、杀伤强度高的新一代光敏剂。

Objective To study the killing effect of hypocrellins B-photodynamic therapy (HB-PDT) for lung cancer cell line A549, to compare with that of hematoporphyrin derivative-photodynamic therapy (HpD -PDT), in order to define the superiority of HB-PDT in the therapy of lung cancer. Methods Lung cancer cell line A549 was used in the study. The cells were incubated in vitro with HB or HpD dissolved in DMEM in different concentrations, and then irradiated by copper vapor laser with mixed wavelength light under saturated light dose. Cell survival rate was respectively measured by MTT assay after 24 hours' incubation. According to cell survival curves after being cultured with different photosensitizers in different concentrations, the equation of each cell survival curve was plotted. Finally IC 50 (50% inhibition concentration) of each photosensitizer was derived. Results The results showed that HB-PDT had a strong killing effect on lung cancer cell. The IC 50 of HB was 33.82ng/ml for lung cancer cell, while the IC 50 of HpD was 1 316.88ng/ml, which was 38.94 fold of that of HB. Conclusions HB was a more effective photosensitizer than the photosensitizer HpD. HB-PDT had strong photodynamic killing effect on lung cancer cell line.