A novel PDT: 5-aminolevulinic acid combined 450nm blue laser photodynamic therapy significantly promotes cell death of HR-HPV infected cells.

Human papillomavirus (HPV) infection and related diseases are clinical challenges. The efficacy of 5- aminolevulinic acid photodynamic therapy (ALA-PDT) using red laser (630± 5 nm) is remarkable and safe. In this study, we aim to investigate the efficacy of ALA-450nm PDT comparing with ALA-635nm PDT. We detected cell proliferation and cell apoptosis through MTT assay and flow cytometry assay respectively. Flow cytometry assay determined the intracellular reactive oxygen species (ROS) generation. Western blotting analysis investigated the protein expression. In vivo, immunohistochemical staining assay and TUNEL assay were performer to detect cell apoptosis. ALA-450nm PDT inhibited the proliferation of End1 and HeLa cells, promoted cell apoptosis more effectively than ALA-635nm PDT, and induced cell death probably through increasing the intracellular ROS generation and caspasedependent apoptosis pathway. In vivo, ALA-450nm PDT significantly inhibited tumour growth and activated cell apoptosis. The ALA-450nm PDT had an advantage over ALA-635nm PDT on inhibiting the proliferation of End1 and HeLa cells and inducing cell apoptosis. The ALA-450nm PDT might be a promising therapeutic strategy for eradicating the HR-HPV infected cells and promoting the integration of diagnosis and treatment of HR-HPV related diseases. [ABSTRACT FROM AUTHOR]