Reactivity of hydrazinophthalazine drugs with the lipid peroxidation products acrolein and crotonaldehyde.

Org Biomol Chem

Molecular Toxicology Research Group, Department of Clinical and Experimental Pharmacology, University of Adelaide, Adelaide, SA 5005, Australia.

Published: September 2004

The nucleophilic drug hydralazine strongly inhibits cell toxicity mediated by acrolein, a short chain 2-alkenal formed during lipid peroxidation. We here report the chemistry of acrolein-trapping by hydralazine, and show that together with its structural analogue dihydralazine, it also readily traps crotonaldehyde. Isolable reaction products included (1E)-acrylaldehyde phthalazin-1-ylhydrazone (E-APH), (1Z)-acrylaldehyde phthalazin-1-ylhydrazone (Z-APH), (1E,2E)-but-2-enal phthalazin-1-ylhydrazone (E-BPH) and (1Z,2E)-but-2-enal phthalazin-1-ylhydrazone (Z-BPH). Concentration-dependent formation of (1E)-acrylaldehyde phthalazin-1-ylhydrazone was observed in the culture media of cells co-exposed to hydralazine and the acrolein precursor allyl alcohol. These aldehyde-sequestering properties of hydrazinophthalazine drugs may contribute to the protection they provide against 2-alkenal-mediated toxicity.

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http://dx.doi.org/10.1039/B408796HDOI Listing

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