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Intravenous immunoglobulin and atherosclerosis
Eiji Matsuura1, Kazuko Kobayashi, Katsumi Inoue
1Department of Cell Chemistry, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan. eijimatu@md.okayama-u.ac.jp
Clinical Reviews in Allergy & Immunology
|January 5, 2006
Summary
Natural antibodies targeting oxidized LDL (oxLDL) show protective effects against atherosclerosis. Intravenous immunoglobulin (IVIg) therapies, rich in these antibodies, reduce atherosclerotic lesion development in mice.
Area of Science:
- Immunology
- Cardiovascular Research
- Atherosclerosis Pathogenesis
Background:
- Oxidized low-density lipoprotein (oxLDL) is a key factor in the development of atherosclerotic lesions.
- Beta2-glycoprotein I (beta2-GPI) co-localizes with oxLDL in atherosclerotic plaques.
- While IgG autoantibodies against beta2-GPI/oxLDL complexes are pro-atherogenic, natural IgM anti-oxLDL antibodies appear protective.
Purpose of the Study:
- To investigate the role of natural anti-oxLDL antibodies in atherogenesis.
- To evaluate the potential of intravenous immunoglobulins (IVIgs) as a therapeutic strategy against atherosclerosis.
Main Methods:
- Studies in apolipoprotein E (ApoE) deficient mice to assess the impact of anti-oxLDL antibodies.
- Administration of IVIg, which contains natural anti-oxLDL antibodies, to ApoE-deficient mice.
- Analysis of atherosclerotic lesion incidence and macrophage foam cell formation.
Main Results:
- Natural IgM anti-oxLDL antibodies reduced atherosclerosis incidence in ApoE-deficient mice.
- IVIg infusion decreased atherosclerosis in ApoE-deficient mice.
- Potential mechanisms include non-antigen-specific antibody binding to FCgamma receptors, inhibiting macrophage foam cell formation.
Conclusions:
- Natural anti-oxLDL antibodies possess a protective role in atherogenesis.
- IVIgs demonstrate anti-atherogenic properties, suggesting therapeutic potential.
- Further research into IVIg's mechanisms, including FCgamma receptor interactions, is warranted.