Protective immunity against atherosclerosis carried by B cells of hypercholesterolemic mice

The Journal of Clinical Investigation
G CaligiuriGöran K Hansson

Abstract

Atherosclerosis is characterized by vascular inflammation and associated with systemic and local immune responses to oxidized LDL (oxLDL) and other antigens. Since immunization with oxLDL reduces atherosclerosis, we hypothesized that the disease might be associated with development of protective immunity. Here we show that spleen-associated immune activity protects against atherosclerosis. Splenectomy dramatically aggravated atherosclerosis in hypercholesterolemic apoE knockout (apoE degrees ) mice. Transfer of spleen cells from atherosclerotic apoE degrees mice significantly reduced disease development in young apoE degrees mice. To identify the protective subset, donor spleen cells were divided into B and T cells by immunomagnetic separation before transfer. Protection was conferred by B cells, which reduced disease in splenectomized apoE degrees mice to one-fourth of that in splenectomized apoE degrees controls. Protection could also be demonstrated in intact, nonsplenectomized mice and was associated with an increase in antibody titers to oxLDL. Fewer CD4(+) T cells were found in lesions of protected mice, suggesting a role for T-B cell cooperation. These results demonstrate that B cell-associated protective immunity develo...Continue Reading

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Methods Mentioned

BETA
FACS
ELISA
transgenic
PCR
MDA

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