[Induction of Apoptosis of Human Cisplatin-resistance Lung Cancer Cells with MPPa-photodynamic Therapy].

Lung cancer is the leading cause of cancer-related deaths worldwide.Despite the development and use of several targeting drugs for lung cancer therapy,the five-year survival rate has remained as low as 15%for the past three decades.Cisplatin-based chemotherapy is considered the first-line therapeutic strategy for lung cancer.However,developments of chemoresistance is a major obstacle for the successful treatment.Therefore,the development of novel therapy against cisplatin-resistance lung cancer is imperative.Photodynamic therapy(PDT),which is a non-invasive combinatorial therapeutic modality using light,photosensitizer(PS)and oxygen,may provide an unprecedented tool to develop more effective treatments.To provide experimental basis for its application in cisplatin-resistance lung cancer,we will discuss the biological effects of MPPa-photodynamic therapy in human cisplatin-resistance lung cancer cells in this article.Human cisplatin-resistance lung cancer cells A549/DDP were co-cultured with MPPa(0,1,2,4,8,16µmol/L)and exposed to light(0,0.6,1.2,2.4,3.6,4.8J/cm2),and cell viability was determined with CCK-8assay.Flow cytometry was used to detect apoptosis,DCFH-DA staining was employed to observe reactive oxygen species(ROS),and Western blot was used to detect the expressions of B-cell lymphoma-2(Bcl-2)protein and Bcl-2associated X protein(Bax).The proliferation of A549/DDP cells was suppressed by PDT.The apoptotic rate in the PDT group was significantly higher than that in the control,MPPa or light group(P<0.05).The level of ROS was increased.The expression of Bax was increased,and that of Bcl-2was decreased.MPPa-photodynamic therapy can significantly suppress cell viability,and induce apoptosis in human cisplatin-resistance lung cancer cells.