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
Atherosclerosisjournal_title
Atherosclerosisauthors
Hofnagel O,Engel T,Severs NJ,Robenek H,Buers Idoi
10.1016/j.atherosclerosis.2011.04.021subject
Has Abstractpub_date
2011-08-01 00:00:00pages
371-8issue
2eissn
0021-9150issn
1879-1484pii
S0021-9150(11)00367-4journal_volume
217pub_type
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