Regulation of adhesion molecule expression by human synovial microvascular endothelial cells in vitro

Arthritis and Rheumatism
S S ToL Schrieber

Abstract

To examine the in vitro expression of E-selectin, P-selectin, intercellular adhesion molecule 1 (ICAM-1), ICAM-2, vascular cell adhesion molecule 1 (VCAM-1), and platelet-endothelial cell adhesion molecule 1 (PECAM-1) by synovial microvascular endothelial cells (SMEC) in comparison with microvascular neonatal foreskin endothelial cells (FSE) and macrovas- cular human umbilical vein endothelial cells (HUVE). Cultured endothelial cells were treated for 4 hours with medium alone or tumor necrosis factor alpha (TNF alpha). The expression of endothelial adhesion molecules was evaluated by flow cytometry, cell enzyme-linked immunosorbent assay, and Northern blot analysis. SMEC continuously expressed E-selectin under basal culture conditions, whereas FSE and HUVE did not. TNF alpha treatment of rheumatoid arthritis (RA) SMEC resulted in sustained peak expression of E- selectin for up to 24 hours, which subsequently declined but remained elevated even at 72 hours. In contrast, peak E-selectin expression in FSE and HUVE occurred between 4 hours and 16 hours after TNF alpha treatment and then declined to near basal levels by 24-48 hours. SMEC expressed significantly higher levels of ICAM-1 compared with HUVE under basal culture condition...Continue Reading

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