Abstract
A new monoclonal antibody against malondialdehyde (MDA)-treated low density lipoprotein (LDL) was raised using homogenate of human atheroma as immunogen. This antibody, DLH2, was obtained by selecting the clones which did not react to native LDL but did react to copper-induced oxidized LDL (OxLDL). DLH2 showed a greater reactivity to MDA-LDL than to OxLDL. When LDL was treated with various aldehyde containing reagents, treatment of LDL with glutaraldehyde or MDA greatly increased the reactivity to the antibody, while LDL treated with 2,4-hexadienal or 4-hydroxynonenal was not reactive. Among many proteins tested, high density lipoprotein, bovine serum albumin and hemoglobin showed significant reactivity to DLH2 after they were treated with MDA or glutaraldehyde. When low density and high density lipoproteins treated with MDA were subjected to immunoblot analysis, newly formed products larger than the original apolipoproteins were detected with the antibody, suggesting that this antibody recognizes aggregated proteins with divalent short chain cross linkers. The antigenic materials were shown by immunohistochemical analysis to be present in foamy macrophages in human atheromatous lesions. DLH2 antigen did not colocalize either w...Continue Reading
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