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Anti-oxidized LDL antibodies and antiphospholipid antibodies in healthy subjects: relationship with lipoprotein- and oxidation-related analytes.

IgG autoantibodies against malondialdehyde-modified LDL (alpha oxLDL), antiphospholipid antibodies (APA) and oxidation- and lipoprotein-related analytes were assayed in sera from healthy subjects (51 males, 115 females, aged 22-63 years). alpha OxLDL levels were associated (P < 0.03) with IgG alpha cardiolipin (r = 0.18), IgM alpha cardiolipin (r = 0.17) and IgM alpha phosphatidyl-serine (r = 0.16) but not with age, cholesterol, triglyceride, apolipoproteins B and AI, lipoprotein(a), lipid peroxides, ceruloplasmin, copper, ferritin, transferrin or iron. APA levels were inversely associated with levels of both oxidation- and lipoprotein-related analytes. Ferritin (3.5%) and alpha oxLDL (1.4%) contributed independently to variation in IgG alpha cardiolipin levels, and apo B (2%) to variation in IgM alpha cardiolipin levels. These associations are small, indicating that there are no major biological associations between the measured variables. The lack of association between alpha oxLDL and lipoprotein- or oxidation-related analytes suggests that the relevant antigen is not in serum.