Inhibition of poly(ADP-ribose) formation by 4-hydroxynonenal in primary cultures of rabbit synovial fibroblasts

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Abstract
The formation of poly(ADP-ribose) in primary cultures of rabbit synovial fibroblasts after treatment with active oxygen released by xanthine/xanthine oxidase is inhibited by addition of 1 and 10 μM 4-hydroxy-2,3-trans-nonenal (HNE). The endogenous formation of HNE by the xanthine/xanthine oxidase system is not responsible for the inhibitory effect of the aldehyde, owing to the low accumulation rate of the lipid peroxidation product in the system used. HNE is able to inhibit the isolated nuclear enzyme ADP-ribosyltransferase, as shown by an in vitro assay with an Ki of 4 μmol/litre. Therefore the molecular basis of HNE-mediated effects on cell proliferation, differentiation and transformation might be due to the inhibitory effect of poly(ADP-ribos)ylation.