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- W2010017411 abstract "DNA strand breaks, measured by alkaline elution, and hypoxanthine guanine phosphoribosyltransferase (HPRT) mutation were studied in V79 cells after photochemical treatment (PCT) or exposure to X-rays. Cells were incubated with the photosensitizers Photofrin II (PII) and three closely related porphyrins tetra-(3-hydroxyphenyl) porphyrin (3THPP), meso-tetra-(4-sulfonatophenyl) porphine (TPPS4) and meso-tetra-(N-methyl-4-pyridyl) porphine (TMPyPH2). These dyes are assumed to act on cellular targets mainly via singlet oxygen when excited by light. While the hydrophilic TPPS4 and TMPyPH2 did not photoinduce mutants to any significant extent, both lipophilic dyes, 3THPP and PII, were significantly mutagenic when excited by light. On the other hand, TPPS4 was the most efficient sensitizer of alkali-labile DNA strand breaks, while TMPyPH2 did not induce any significant amount of either type of DNA damage. Surprisingly, no correlation between the two parameters was found for PCT, either after exposures inactivating 50% of the cells or after exposures inactivating 90% of them. The lack of correlation between the yields of DNA strand breaks and of mutants could not be explained by differences in the intracellular localization pattern of the dyes." @default.
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- W2010017411 title "No correlation between DNA strand breaks and HPRT mutation induced by photochemical treatment in V79 cells" @default.
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- W2010017411 doi "https://doi.org/10.1016/0165-7992(94)90048-5" @default.
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