The study elucidates the chemical kinetics of daunorubicin reduction and semiquinone radical formation, which may have implications for its antitumour action.
May inform anthracycline redox mechanisms in cardiomyocytes; leaves open clinical translation to cardiotoxicity or dosing.
Daunorubicin aqueous solutions were reduced by COO .−1 or e aq −1 free radicals produced by pulse radiolysis. The kinetics of the semiquinone radical formation and decay were studied. The semiquinone disproportionation leads to a pseudo‐equilibrium between the drug, its semiquinone and hydroquinone reduced states ( K eq = 30 at pH 7), which lasts a few hunderd milliseconds and which is destroyed by the hydroquinone glycosidic cleavage. Consequences concerning daunorubicin antitumour action are briefly discussed.
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Houée‐Levin et al. (1985) studied this question.
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