Oxidized low-density lipoprotein and β2-glycoprotein I in patients with systemic lupus erythematosus and increased carotid intima-media thickness: Implications in autoimmune-mediated atherosclerosis

Luis R. Lopez, M. Salazar-Paramo, C. Palafox-Sanchez, B. L. Hurley, E. Matsuura, I. Garcia-De La Torre

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Abstract

Oxidative stress and LDL modification (oxLDL) are early pro-atherogenic events. OxLDL binds β2GPI producing immunogenic oxLDL/β2GPI complexes. Antibodies to these complexes have been associated with arterial thrombosis in patients with systemic lupus erythematosus (SLE) and antiphospholipid syndrome (APS). Circulating oxLDL/β2GPI complexes, IgG and IgM antibodies to these complexes were measured by ELISA in 30 SLE patients asymptomatic for cardiovascular disease (mean age 31 years) and 27 age/sex matched healthy controls. Carotid intima-media thickness (IMT) was measured by ultrasound in all patients and controls. Forty-seven percent of SLE presented plaques (median IMT of 0.65 ± 0.12 mm) while only 7% of the controls had plaques (median IMT of 0.50 ± 0.04 mm, P < 0.001). Median optical density (OD 450nm) for oxLDL/β2GPI complexes in SLE was 0.244 ± 0.07, higher than controls (0.174 ± 0.09, P < 0.001). Median OD for IgG anti-oxLDL/β2GPI antibodies was also higher in SLE (0.297 ± 0.26) compared to controls (0.194 ± 0.07, P < 0.001) while the median OD for IgM antibodies in SLE (0.444 ± 0.46) was not different than controls (0.326 ± 0.22, P = 0.267). There was no correlation between IMT and oxLDL/β2GPI complexes, IgG or IgM antibodies, possibly reflecting the complex interrelationship between these serologic elements and tissue factors in the arterial wall. These results support the hypothesis that oxLDL/β2GPI complexes and IgG (not IgM) anti-oxLDL/β2GPI antibodies contribute to the development of autoimmune-mediated atherosclerosis.

Original languageEnglish
Pages (from-to)80-86
Number of pages7
JournalLupus
Volume15
Issue number2
DOIs
Publication statusPublished - Mar 13 2006

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Keywords

  • Autoimmune-mediated atherosclerosis
  • Intima-media thickness
  • Oxidized low-density lipoprotein
  • Systemic lupus erythematosus
  • β2-glycoprotein I

ASJC Scopus subject areas

  • Rheumatology

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