Irradiation at 635/670nm in 5-aminolevulinic acid-mediated photodynamic therapy: The anti-tumor effect / 第二军医大学学报

ABSTRACT

Objective To increase the anti-tumor effect of 5-ALA-mediated photodynamic therapy, PDT was performed at 635nm followed by an additional irradiation at 670nm, and the effectiveness was studied. Methods PDT was performed at single irradiation (635nm or 670nm), and symphysial irradiation (635nm+670nm), and its effectiveness was studied using PpIXsolutions, tumor cells (9L and HeLa), andHeLa tumor-bearing mice. Results When a Pp IX solution was irradiated at 635 nm or 670nm, singlet oxygen counts were almost similar. Symphysial irradiation -mediated singlet oxygen generation was higher in 9L cells than HeLa cells and it did not produce an additional PDT effect in HeLa tumors. Conclusion It was suggested as the low uptake of 5-ALA in HeLa cells, and the symphysial irradiation can't increase the anti-tumor effects in 5-ALA-mediated PDT. Further study is necessary to obtain the irradiation method for the efficient application of PDT.