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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Jan 31;92(3):821–825. doi: 10.1073/pnas.92.3.821

Immunization of low density lipoprotein (LDL) receptor-deficient rabbits with homologous malondialdehyde-modified LDL reduces atherogenesis.

W Palinski 1, E Miller 1, J L Witztum 1
PMCID: PMC42712  PMID: 7846059

Abstract

Atherosclerotic lesions contain oxidized LDL (OxLDL), immunoglobulins, and immune-competent cells. Low levels of circulating autoantibodies against malondialdehyde (MDA)-modified lysine, an epitope of OxLDL, occur in several species, and immune complexes between such autoantibodies and OxLDL are present in lesions. To study the potential role of autoantibodies against OxLDL in the atherogenic process, we prospectively hyperimmunized LDL receptor-deficient rabbits with homologous MDA-LDL and determined the effects of this intervention on the development of atherosclerosis. Immunization with MDA-LDL generated high titers of antibodies with similar specificity as naturally occurring autoantibodies. Immunized animals showed a significant reduction in the extent of atherosclerotic lesions in the aortic tree after 6.5 months, compared with "saline"-immunized controls (48% vs. 68%, P < 0.005). Immunization with keyhole limpet hemocyanin produced no change in lesion formation. Although the mechanisms by which immunization led to a protective effect are unknown, these results suggest an important role for the immune system in modulating the atherogenic process and may indicate a novel approach for inhibiting the progression of atherosclerosis.

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Selected References

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