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Jürgens, G; Lang, J; Esterbauer, H.
Modification of human low-density lipoprotein by the lipid peroxidation product 4-hydroxynonenal.
Biochim Biophys Acta. 1986; 875(1):103-114 Doi: 10.1016/0005-2760(86)90016-0
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Leading authors Med Uni Graz: Jürgens Günther
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Abstract:: The effects of the lipid peroxidation product 4-hydroxynonenal on freshly prepared human low-density lipoprotein (LDL) were studied. At a fixed LDL concentration (5.7 mg/ml) the amount of 4-hydroxynonenal incorporated into the LDL increased with increasing aldehyde concentration from 28-30 (0.2 mM) to 140 (1 mM) mol per mol LDL, whereas at a fixed aldehyde concentration (0.2 mM) its incorporation into LDL decreased with increasing LDL concentration from 48 (1 mg LDL/ml) to 26 (12 mg LDL/ml) mol 4-hydroxynonenal bound per mol LDL. Of the total hydroxynonenal taken up 78% was bound to the protein and 21% to the lipid moiety; the remaining 1% was dissolved as free aldehyde in the lipid fraction. Amino acid analysis of the apolipoprotein B revealed that 4-hydroxynonenal attacks mainly the lysine and tyrosine residues and to a lesser extent also serine, histidine and cysteine. Treatment of LDL with 4-hydroxynonenal results in a concentration-dependent increase of the negative charge of the LDL particle as evidenced by its increased electrophoretic mobility. Moreover, 4-hydroxynonenal treatment leads to a partial conversion of the apolipoprotein B-100 into higher molecular weight forms most probably apolipoproteins B-126 and B-151. Compared to malonaldehyde, 4-hydroxynonenal exhibits a much higher capacity to modify LDL and it is therefore believed that this aldehyde is a more likely candidate for being responsible for LDL modification under in vivo lipid peroxidation conditions.
Find related publications in this database (using NLM MeSH Indexing): Aldehydes - blood; Amino Acids - analysis; Apolipoproteins B - blood; Binding Sites - blood; Carbon Radioisotopes - blood; Humans - blood; Kinetics - blood; Lipid Peroxides - blood; Lipoproteins, LDL - blood; Molecular Weight - blood; Protein Binding - blood; Radioisotope Dilution Technique - blood