Selective inhibition by probucol of vascular cell adhesion molecule-1 (VCAM-1) expression in human vascular endothelial cells.
An early event in atherogenesis is the adhesion of monocytes to endothelium via adhesion molecules, such as VCAM-1 and intracellular adhesion molecule-1 (ICAM-1). It has been suggested that VCAM-1 plays a very important role in the recruitment of monocytes in atherosclerosis. Probucol is a potent inhibitor of atherosclerosis in animal models. However, the mechanism of its antiatherogenic effect is poorly understood. The aim of our study was to evaluate whether probucol can influence the expression of endothelial cell adhesion molecules and endothelial adhesiveness. The study was performed on cultured human umbilical vein endothelial cells (HUVEC). HUVEC were pretreated with probucol (50 microM) at different time periods before stimulation with TNFalpha (100 U ml(-1)) or IL-1beta (100 U ml(-1)). The protein expression of VCAM-1 and ICAM-1 was measured by flow cytometry. VCAM-1 mRNA expression was measured by reverse transcription polymerase chain reaction (RT PCR). Probucol time dependently reduced agonist-induced VCAM-1 ( approximately 45%, 48 h) surface protein and mRNA expression ( approximately 40%, 48 h) in HUVEC, but not ICAM-1 surface protein expression. Decreased VCAM-1 expression was associated with reduction ( approximately 40%) of adherence between cytokine-stimulated HUVEC and peripheral blood mononuclear leukocytes (PBMC). Our results suggest that the antiatherogenic effect of probucol may, in part, be due to a downregulation of VCAM-1 expression.
Zapolska-Downar
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D
Regional Center for Atherosclerosis Research, Pomeranian Academy of Medicine, al. Powstancow Wlkp. 72, 70111, Szczecin, Poland.
Zapolski-Downar
A
A
Markiewski
M
M
Ciechanowicz
A
A
Kaczmarczyk
M
M
Naruszewicz
M
M
D000924:Anticholesteremic Agents / Q000494:pharmacology*; D002448:Cell Adhesion; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology; D005434:Flow Cytometry; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D011341:Probucol / Q000494:pharmacology*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D014471:Umbilical Veins; D019010:Vascular Cell Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism*
D000924:Anticholesteremic Agents; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1; D011341:Probucol