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The effect of laser activation of 5,10,15,20-tetra-sulphophenyl-porphyrin loaded in K562 cells and human normal mononuclear cells.

Photodynamic therapy (PDT) is a relatively new type of treatment in cancer, based on a photosensitizer, visible light and molecular oxygen. Reactive oxygen species are generated, causing tumor cells death by apoptosis or necrosis. Significant nowadays research efforts are focused on finding new photosensitizers with antineoplastic activity and an acceptable toxicological profile. Although consistent information exists regarding PDT in solid tumors, relatively few data are available for PDT of blood cancers. Therefore, we carried out a comparative study on lymphoblastic K562 cells and human normal peripheral blood mononuclear cells (PBMC) treated at a density of 2 x 10(5) cells/mL with 5,10,15,20-tetra-sulphophenyl-porphyrin (TSPP) and then irradiated with He-Ne laser light (lamda = 632.8 nm). The following cell functions were investigated: viability, multiplication, RNA synthesis, total RNA levels and apoptosis. After irradiation, the viability of TSPP-loaded tumor cells decrease, the multiplication rate and the total RNA level are drastically reduced and cells undergo apoptosis. TSPP alone loaded into cells but not activated by irradiation, does not affect these cell parameters. Human normal PBMC subjected to TSPP loading and laser-irradiation develop a different cellular response, their viability and proliferative capacity not being altered by experimental PDT. Accordingly, it appears that TSPP is a non-aggressive compound for cellular physiology and becomes cytotoxic only by irradiation; moreover laser-activated TSPP affects only cells that have a tumoral pattern.