Chemotactic activity of the lipid peroxidation product 4-hydroxynonenal and homologous hydroxyalkenals

Biological Chemistry Hoppe-Seyler
M CurzioM U Dianzani

Abstract

The effect of the lipid peroxidation product 4-hydroxynonenal and homologous aldehydes (4-hydroxyoctenal, 4-hydroxyundecenal, 4-hydroxytetradecenal and 4-hydroxypentadecenal) on migration and polarization of rat neutrophils was examined. The most effective aldehydes were 4-hydroxyoctenal and 4-hydroxypentadecenal, which stimulated oriented migration at ED50 = 1.4 X 10(-12) M and 1.3 X 10(-12) M, resp., whereas the other aldehydes had ED50 between 1 X 10(-7) and 6 X 10(-11) M. The peptides fMet-Phe and fMet-Leu-Phe used as positive controls had ED50 values of 4.2 X 10(-7) M and 4.5 X 10(-10) M resp. The 4-hydroxyalkenals induced only a small increase of the percentage of polarized cell and did not enhance the random migration. The effects of 4-hydroxyalkenals were only observed when the incubation buffer contained bovine serum albumin (BSA), in the absence of BSA neither the aldehydes nor the peptides exhibited chemotactic properties. Since the aldehydes easily react with the sulfhydryl groups of the BSA to form the S-alkylated BSA in an equilibrium reaction, the chemotactic substance could either be the free aldehyde or the BSA-aldehyde adduct. The adduct prepared from BSA and 4-hydroxynonenal was chemotactic at doses of 0.65 t...Continue Reading

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