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- W2035993325 abstract "Recently, we established that 13S-hydroperoxy-linoleic acid is converted to 4S-hydroperoxy-nonenal (4S-HPNE) during autoxidation, implicating hydrogen abstraction from C-8 as an initiating step [Schneider, C., et al. (2001) J. Biol. Chem. 275, 20831-20838]. On the basis of the proposed mechanism, an equivalent initiating reaction could occur from the corresponding 13S-hydroxy acid. Herein, we examined the outcome of autoxidation reactions of the omega6 hydroxy fatty acids, 13S-hydroxyoctadecadienoic acid and 15S-hydroxyeicosatetraenoic acid, as compared with reactions of the corresponding hydroperoxy substrates. Autoxidation of the hydroxy starting materials (37 degrees C, dry film) yielded 4-hydroxy-nonenal (4-HNE) as a prominent polar metabolite (and not the 4-hydroperoxide), whereas the hydroperoxide starting materials gave rise to 4-HPNE. Stereochemical analysis showed that the optical purity of the 4-hydroxy group of 4-HNE precisely matched the optical purity of the 15S- or 13S-hydroxy group of the starting fatty acid substrate (98 and 90% S, respectively). The hydroperoxide 15S-HPETE (98% 15S) gave rise to 4S-HPNE, also with retention of optical purity (98% 4S). The preservation of stereochemical configuration provides evidence that aldehyde formation does not involve participation of the hydro(pero)xy group and indicates a similar mechanism for the formation of 4-HNE and 4-HPNE during autoxidation of omega6 hydro(pero)xy fatty acids. Our results establish, moreover, that omega6 hydroxy fatty acids are potential precursors of reactive cytotoxic aldehydes in biological systems." @default.
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- W2035993325 date "2004-06-19" @default.
- W2035993325 modified "2023-09-25" @default.
- W2035993325 title "Autoxidative Transformation of Chiral ω6 Hydroxy Linoleic and Arachidonic Acids to Chiral 4-Hydroxy-2<i>E</i>-nonenal" @default.
- W2035993325 cites W1547306214 @default.
- W2035993325 doi "https://doi.org/10.1021/tx049913n" @default.
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