Abstract：
:Endothelial cell activation antigens may play important roles in immune responses and in inflammation. This report describes the identification and characterization of a monoclonal antibody, named EAA-B, which reacts specifically with human umbilical vein endothelial (HUVE) cells pre-treated with tumour necrosis factor-alpha (TNF-alpha) but not with untreated cells. The expression of the EAA-B antigen on HUVE cells could also be induced by interleukin-1 (IL-1), bacterial lipopolysaccharide (LPS), and phorbol esters but not by interferon-gamma (IFN-gamma). By contrast, EAA-B antigen expression on neonatal foreskin and rheumatoid synovial fibroblasts, whether pre-treated with TNF-alpha or not, was not detectable. Peripheral blood leucocytes and the leukaemic cell lines U937, HL-60, Raji and Molt 4 showed no detectable expression of the EAA-B antigen. Kinetic studies demonstrated that the EAA-B antigen was rapidly expressed, peaked at 6 hr and declined to basal level by 24 hr. Western blotting revealed that monoclonal antibody EAA-B recognized a polypeptide of approximately 80,000-90,000 MW. EAA-B partially blocked the augmented adhesion of HL-60 cells to TNF-treated HUVE cells. However, it failed to inhibit the enhanced binding of peripheral blood leucocytes, U937, Raji and Molt 4 Cells to TNF-treated HUVE cells. In situ, the EAA-B antigen was detected on some vascular endothelium in tonsils, lymph nodes, psoriatic skin and rheumatoid synovium but not in normal non-lymphoid tissues. Interestingly EAA-B antigen is also expressed by B lymphocytes in germinal follicle centres (GFC) of lymphoid tissues. The co-expression of this endothelial activation antigen by GFC B lymphocytes may have significant implications for immune responses and in B-lymphocyte differentiation.
journal_name
Immunologyjournal_title
Immunologyauthors
To SS,Magoulas T,Nicholson E,Schrieber Lkeywords:
subject
Has Abstractpub_date
1992-08-01 00:00:00pages
616-24issue
4eissn
0019-2805issn
1365-2567journal_volume
76pub_type
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