Enhancement of radiosensitivity of oral carcinoma cells by iodinated chlorin p6 copper complex in combination with synchrotron X-ray radiation
In this study the anticancer cytotoxic efficacy of a new chlorophyll derivative, iodinated chlorin p6 copper complex (ICp6-Cu), combined with synchrotron X-ray radiation (8 – 10 keV) in two human oral cancer cell lines is explored. Pre-treatment of cells with 20 µ M and 30 µ M ICp6-Cu for 3 h was found to enhance the X-ray-induced cytotoxicity with sensitization enhancement ratios of 1.8 and 2.8, respectively. ICp6-Cu localized in cytoplasm, mainly in lysosomes and endoplasmic reticulum, and did not cause any cytotoxicity alone. The radiosensitization effect of ICp6-Cu accompanied a significant increase in the level of reactive oxygen species, damage to lysosomes, inhibition of repair of radiation-induced DNA double-strand breaks, increase in cell death and no significant effect on cell cycle progression. These results demonstrate that ICp6-Cu is a potential agent for synchrotron photon activation therapy of cancer.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Sarbadhikary, P. Dube, A. Tags: chlorophyll derivative DNA damage radiosensitization reactive oxygen species synchrotron photon activation therapy research papers Source Type: research
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