Abstract
1. Mycophenolic acid (MPA) is an inhibitor of inosine-5'-monophosphate dehydrogenase and therefore interferes with cellular GTP biosynthesis. Recently, MPA has been used as an antiproliferative and immunosuppressive agent. In the present study, the effect of MPA on the expression of the endothelial cell adhesion molecules (CAMs), intercellular (I) CAM-1, vascular (V) CAM-1 and endothelial (E)-selectin, was investigated in tumour necrosis factor-alpha (TNF alpha)-activated cultured human venous endothelial cells (EC). 2. Surface expression of CAMs was measured by flow cytometry and mRNA expression by Northern blot analysis. Transcriptional activation of CAMs by the nuclear factor NF-kappaB was determined by an electromobility shift assay. The function of CAMs was studied by a static adhesion assay with human monocyte-like undifferentiated U937 cells. 3. Pretreatment of TNF alpha- (5 ng ml(-1), 12 h) activated EC with MPA (10 microM, 24 h) increased the binding of U937 cells, which had not been treated with MPA, by approximately 2 fold. MPA-pretreatment of EC did not affect TNF alpha-induced surface expression of ICAM-1. However, VCAM-1 and E-selectin were increased 2-3 fold and remained elevated up to 24 h, by which time TNF alp...Continue Reading
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