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American Journal of Pathology, Vol 140, 1055-1060, Copyright © 1992 by American Society for Investigative Pathology
REGULAR ARTICLES |
CW Marlor, DL Webb, MP Bombara, JM Greve and ML Blue
Institute for Arthritis and Autoimmunity, Miles Research Center, West Haven, CT 06516.
Rapid expression of mRNA encoding vascular cell adhesion molecule-1 (VCAM-1) was induced by tumor necrosis factor (TNF) in fibroblast-like cells obtained from synovial tissue. Both alternatively spliced forms of VCAM-1 mRNA were detected by polymerase chain reaction in TNF- stimulated fibroblast-like synoviocytes. Western blotting analysis showed that two distinct proteins, reactive with an anti-VCAM-1 anti- sera, were expressed by 2 hours of TNF stimulation in both synoviocytes and human umbilical cord vein endothelial cells (HUVEC). The majority of HUVEC and synoviocytes displayed VCAM-1 surface expression after several hours of TNF stimulation. In contrast, dermal fibroblasts upregulated intercellular adhesion molecule-1 (ICAM-1) but not VCAM-1 expression in response to TNF. These results indicate that VCAM-1 and ICAM-1 expression can be differentially regulated and suggest tissue specific regulation of VCAM-1 expression. Furthermore, these findings may provide an explanation for the chronic retention and activation of long-lived lymphocytes and monocytes, which express VLA-4 (the receptor for VCAM-1), in the synovium in rheumatoid arthritis.
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