SELECTION AND TESTING OF EXPERIMENTAL MODELS OF NORMAL AND MALIGNANT HUMAN CELLS IN VITRO AND EVALUATION OF THEIR SENSITIVITY RANGE TO THE NEUTRON/CAPTURE AND PHOTON/CAPTURE AGENTS AND PHOTOSENSITIZERS.

Objective: to investigate the structural and morpho-functional changes in test systems of malignant (A-549 cellline) and normal (fibroblasts of the 6th passage) human cells during incubation with gadolinium-containing pho-ton-capture agent «Dotavist» and photosensitizer «Fotolon».

Methods: The passaged (continuously interweaved) cell culture technique on normal human fibroblasts and malig-nant human cells; cytological, biophysical, statistical methods.

Results: The cytotoxic properties of «Dotavist» gadolinium-containing photon-capturing agent and «Photolon»photosensitizer in a wide range of concentrations (5, 10, 25, 50, 100 and 200 μl/ml) were studied by the morpho-functional characteristics (growth kinetics, proliferative and mitotic activity, presence of atypical cells) in the invitro test systems of malignant (non-small cell lung cancer cell line A-549) and normal (6th passage fibroblasts)human cells. It was found that the cytotoxic properties of «Dotavist» in test systems of malignant and normal cellsare expressed under its administration in high concentrations (100 and 200 μl/ml). During incubation with«Photolon» photosensitizer the cytotoxic effect on malignant cells was determined at the lowest concentrations (5and 10 μl/ml). Photosensitizer administration in the increasing concentrations has lead to genotoxic effects.Cytotoxic effect of photosensitizer on the normal human fibroblasts was evident in the 5-200 μl/ml concentrationrange. There was a moderate decrease in mitotic activity along with increasing concentration. Genotoxic propertiesof photosensitizer were evident at 25 μl/ml concentration and above.

Conclusion: Study results of the effectiveness of neutron-capture and photon-capture technologies by the sensi-tivity assay in the in vitro test systems of human malignant cells (non-small cell lung cancer cell line A-549) andnormal cells (transplantable human fibroblast culture, the 6th passage) to the gadolinium-containing photon-cap-ture «Dotavist» agent and «Photolon» photosensitizer in different concentrations provide the basis for pre-clinicalstage of evaluating the effectiveness of medications used in binary technologies.