Lectin-like oxidized LDL receptor-1 is a cell-adhesion molecule involved in endotoxin-induced inflammation

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The National Academy of Sciences

RESUMO

Lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is a major endothelial receptor for oxidized low-density lipoprotein, and is assumed to play a proatherogenic role in atherosclerosis. LOX-1 expression is induced by inflammatory cytokines as well as by proatherogenic stimuli. LOX-1 protein binds aged/apoptotic cells, activated platelets, and bacteria, suggesting that it may have diverse activities in vivo. Here, we reveal a role for LOX-1 in endotoxin-induced inflammation. In a model of endotoxemia, injection of a high dose of endotoxin into rats induced leukopenia within 1 h and death of the animals within 24 h. Preadministration of anti-LOX-1 antibody reduced the degree of leukopenia and completely rescued the animals, whereas control IgG did not. In a model of low-dose endotoxin-induced uveitis, anti-LOX-1 antibody efficiently suppressed leukocyte infiltration and protein exudation. In situ videomicroscopic analyses of leukocyte interactions with retinal veins revealed that anti-LOX-1 antibody reduced the number of rolling leukocytes and increased the velocity of rolling, suggesting that LOX-1 functions as a vascular tethering ligand. The ability of LOX-1 to capture leukocytes under physiologic shear was confirmed in an in vitro flow model. Thus, LOX-1 is an adhesion molecule involved in leukocyte recruitment and may represent an attractive target for modulation of endotoxin-induced inflammation.

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