Photodynamic therapy using the photosensitizer based on tricarbocyanine dye with polyethylene glycol on a model for tumor bearing laboratory animals
Abstract
Comparative studies of the effectiveness of photodynamic therapy during the experiments «in vitro» and «in vivo» have been performed when using radiation of a semiconductor laser with the wavelength 740 nm and of a light-emitting diode with the wavelength 780 nm. It has been established that the percentage of dead cancer cells is the same when the photosensitizer in HeLa cells is subjected to the photoeffect of light quanta with different energies and when absorption of the identical numbers of photons per unit time by the photosensitizer is ensured. In the experiments with laboratory animals in vivo for a strain of M-1 sarcoma tumors it has been established that, due to an increase in the photoexposure wavelength from 740 to 780 nm and owing to the maintained the same numbers of absorbed light quanta per unit time per unit volume of the tumors, a depth of their damage increased by a factor of 1.5. The observed changes are associated both with the differences in the transmission of tissues in vivo as the wavelength of light radiation increases and with the growing local oxygen concentration due to the photodissociation of oxyhemoglobin.
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