Study of senzitizers phototoxicity on molecular level and possibilities their use for photodynamic tumors therapy

Photodynamic therapy is a modern and promising method of treating some types of tumors. It can supplement and in some cases even replace the current methods. It is based on the use of a photosensitive substance, a senzitizer, which is located in tumor cells and subsequently exposed to the light of an approporiate wave length, which brings about photodynamic reaction. Photodynamic reaction arises due to the combination of four agents: a senzitizer, molecular oxygen, light of optimum wave length, and a biological substrate (proteins, nucleic acid or other cell components). After the application of the senzitizer, whose prior uptake takes place in the pathologically altered tissues, visible light of a wave length corresponding with the absorption maximum of the photosenzitizer is applied, which brings about tumor cells destruction at active participation of the reactive oxygen forms as superoxide anion, hydrogen peroxide and hydroxyl radicals. My thesis was focused on testing photodynamic properties of ZnTPPS4 senzitizer on tumor cell lines. The production of oxygen reactive forms was tested by Synergy HT spectrofluorimeter and Olympus IX 81 fluorescence microscope with image analysis. Production of reactive oxygen forms was assessed with the use of molecular symbol CM-H2 DCFDA. LED emitters adapted for working with cell cultures were used to irradiate the cell structures. The results proved that ZnTPPS4 is photodynamically effective and the production of reactive forms of oxygen depends on senzitizer ZnTPPS4 concentration as well as on the dose of radiation