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OBJECTIVE: Lymphocyte activation is thought to play a major role in the pathogenesis of atherosclerotic complications such as plaque thrombosis. Circulating CD31+ T cells have been shown to regulate human T cell activation. Aim of this study was to evaluate whether the proportion of circulating immunoregulatory CD31+ T cells is correlated to the occurrence of plaque thrombosis in aged apolipoprotein (apo) E knockout (KO) mice. METHODS AND RESULTS: CD31+ T cell depletion of spleen T cells enhanced proliferation (P<0.05) and interferon-gamma production (P<0.01) while reducing interleukin (IL)-4 (P<0.001) and IL-10 (P=0.001) secretion in response to minimally modified low-density lipoprotein. CD31+ T cells were counted in 65 apoE KO mice (46-week-old) by flow cytometry. Organizing thrombi could be documented in 28 of 195 (14%) lesions and in at least one of the aorta root lesions in 23 of 65 mice (35%). CD31+ T cell count was significantly reduced in mice showing plaque thrombosis (72.3+/-1.5% versus 84.1+/-1.2%; P<0.0001), but such reduction did not follow induced plaque rupture or experimentally controlled thrombosis. CONCLUSIONS: Reduced CD31+ T cells in circulating blood is a hallmark of atherosclerotic plaque thrombosis. Our data suggest that CD31+ T cells may play an important regulatory role in the development of plaque thrombosis.

Original publication

DOI

10.1161/01.ATV.0000172660.24580.b4

Type

Journal article

Journal

Arterioscler Thromb Vasc Biol

Publication Date

08/2005

Volume

25

Pages

1659 - 1664

Keywords

Animals, Apolipoproteins E, Atherosclerosis, Biomarkers, Female, Immunohistochemistry, Lymphocyte Activation, Lymphocyte Count, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Platelet Endothelial Cell Adhesion Molecule-1, Rupture, T-Lymphocytes, Thrombosis