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“As ascorbic acid is a reducing agent that is known to be able to reduce quinones, it could be possible that the observed modulatory effects are a consequence of a direct redox reduction between mitomycin C and ascorbate.”
“As the … of mitomycin C … ascorbate is rather inefficiently at physiologically relevant pH values we conclude that the modulatory effect of ascorbate on the cytotoxicity of mitomycin C is not the result of a direct redox reaction and therefore this modulation must be the consequence of other biochemical mechanisms.”
“Furthermore, ascorbate increased the toxic potencies of both BMY 25282 and MMC in catalase-inactivated hepatocytes by as much as 60- and 40-fold, respectively.”