Abstract：
BACKGROUND & AIMS:Molecules that regulate T-cell adhesion to hepatic endothelium and thereby recirculation of T cells to the liver are poorly understood. Because the adhesion molecule vascular adhesion protein-1 (VAP-1), which mediates lymphocyte binding to lymph node endothelium, is expressed on hepatic endothelium, it could play a role in regulating T-cell recruitment to the liver. The aim of this study was to investigate the distribution of VAP-1 expression in human liver and the ability of VAP-1 to support T-cell binding to hepatic endothelium in vitro. METHODS:Hepatic VAP-1 expression was investigated using immunohistochemistry and specific monoclonal antibodies, and VAP-1-mediated adhesion to hepatic endothelium was investigated with a tissue-binding adhesion assay using human liver sections. RESULTS:VAP-1 was expressed on sinusoidal and vascular endothelium in non-inflamed liver and in inflamed liver from patients with either allograft rejection or primary biliary cirrhosis. T cells from healthy donors bound to hepatic endothelium when added to noninflamed liver sections; this binding was inhibited by a specific anti-VAP-1 antibody but not by antibodies to intercellular adhesion molecule 1, lymphocyte function--associated antigen 1, or very late after activation (antigen) 4. VAP-1--mediated adhesion was unaffected by T-cell activation with phorbol ester. CONCLUSIONS:VAP-1 is constitutively expressed on hepatic endothelium and mediates T-cell adhesion to hepatic endothelium in vitro. VAP-1 could play a critical role in regulating T-cell recirculation to the liver in vivo.
journal_name
Gastroenterologyjournal_title
Gastroenterologyauthors
McNab G,Reeves JL,Salmi M,Hubscher S,Jalkanen S,Adams DHdoi
10.1053/gast.1996.v110.pm8566600subject
Has Abstractpub_date
1996-02-01 00:00:00pages
522-8issue
2eissn
0016-5085issn
1528-0012pii
S0016508596000844journal_volume
110pub_type
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