SR-PSOX at sites predisposed to atherosclerotic lesion formation mediates monocyte-endothelial cell adhesion.

Abstract:

OBJECTIVE:The scavenger receptor SR-PSOX/CXCL16, which is identical to the chemokine CXCL16, is thought to be involved in atherogenesis. However, the presence and function of SR-PSOX/CXCL16 in the endothelium of atherosclerotic arteries has not been substantiated. METHODS AND RESULTS:In rabbit aorta immunocytochemistry revealed SR-PSOX/CXCL16 primarily in the endothelium at sites predisposed to lesion formation, in the endothelium of early atherosclerotic lesions, and mainly in intimal macrophages of more developed lesions, indicating that SR-PSOX/CXCL16-expression shifts during atherogenesis. In addition to its function as scavenger receptor and chemokine, SR-PSOX mediated the adhesion of THP-1 monocytes to endothelial cells in vitro. Both THP-1 monocytes and endothelial cells express SR-PSOX/CXCL16, and THP-1 monocytes express CXCR6, the specific receptor for SR-PSOX/CXCL16. Anti-SR-PSOX/CXCL16 and anti-CXCR6 antibody block monocyte adhesion, showing that SR-PSOX/CXCL16-CXCR6 interaction mediates monocyte-endothelial cell adhesion. SR-PSOX/CXCL16 expression of endothelial cells is upregulated by pro-inflammatory cytokines, and is reversed by incubation with ciglitazone and lovastatin. CONCLUSIONS:We suggest that SR-PSOX/CXCL16 may promote the adhesion of monocytes to the endothelium during early atherogenesis and that accumulating cytokines enhance SR-PSOX/CXCL16-mediated adhesion by upregulating SR-PSOX/CXCL16 expression. Manipulation of SR-PSOX/CXCL16 expression with anti-inflammatory agents may be of therapeutic value.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Hofnagel O,Engel T,Severs NJ,Robenek H,Buers I

doi

10.1016/j.atherosclerosis.2011.04.021

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

371-8

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(11)00367-4

journal_volume

217

pub_type

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