Correlations between electrochemical behaviors and DNA photooxidative properties of non-steroïdal anti-inflammatory drugs and their photoproducts.
Alkali-labile lesion to DNA photosensitized, via an electron transfer mechanism, by three non-steroidal anti-inflammatory drugs (NSAIDs), ketoprofen, tiaprofenic acid and naproxen and their photoproducts during drug photolysis, was investigated using (32)P-end labelled synthetic oligonucleotide. These photooxidative damages were correlated with the photophysical and electrochemical properties of drugs, appearing as the photosensitizer PS. Photophysical studies provided the excited state energies of the photosensitizer while their redox potentials and the relative stabilities of the PS(-) radical-anions were determined by cyclic voltammetry. On the basis of these data, we have calculated the Gibbs energy of photoinduced electron-transfer and evaluated the exergonicity of the oxidative photodamage. Moreover, kinetic control may be invoked according to the stabilities of PS(-). Applied to this NSAIDs family, the photoxidative damages through electron transfer mechanism were analyzed and a good correlation with photoredox and photobiological properties was established.
Université de Toulouse, Université Paul Sabatier, Laboratoire IMRCP, Bat. 2 R1, 118 route de Narbonne, F-31062 Toulouse cedex 09, France.
SourceJournal of photochemistry and photobiology. B, Biology 110: 2012 May 2 pg 34-42
MeSHAnti-Inflammatory Agents, Non-Steroidal
Pub Type(s)Journal Article