TLR4 in monocytes plays a pivotal role on monocyte adhesion to vascular endothelium (LB226)

Toll‐like receptor 4 (TLR4) is known to mediate monocyte adhesion to endothelial cells via an increased expression of adhesion molecules on endothelial cells (EC), however, its role on the expression of monocyte adhesion molecules is unclear. In the present study, we investigated the role of TLR4 on the expression of monocyte adhesion molecules, and determined the functional role of TLR4‐induced adhesion molecules on monocyte adhesion to vascular endothelium. When THP‐1 monocytes were stimulated with Kdo2‐Lipid A (KLA), a specific TLR4 agonist, Mac‐1 expression was markedly increased in association with an increased adhesion of monocytes to EC. These were attenuated by anti‐Mac‐1 antibody, suggesting a functional role of TLR4‐induced Mac‐1 on monocyte adhesion on EC. In monocytes treated with MK886, a 5‐lipoxygenase (LO) inhibitor, both Mac‐1 expression and monocyte adhesion to EC induced by KLA were markedly attenuated. Moreover, KLA increased the expression of mRNA and protein of 5‐LO, suggesting a pivotal role of 5‐LO on these processes. In in vivo studies, KLA increased monocyte adhesion to aortic endothelium of wild‐type (WT) mice, which was attenuated in WT mice treated with anti‐Mac‐1 antibody as well as in TLR4‐deficient mice. Taken together, TLR4‐mediated expression of Mac‐1 in monocytes plays a pivotal role on monocyte adhesion to vascular endothelium, leading to increased foam cell formation in the development of atherosclerosis. Grant Funding Source : None