Abstract：
:The migration of leucocytes into tissues is a process mediated by leucocyte endothelial interactions, in which adhesion receptors play a crucial role. Recently, it was found that 80-90% of T cells in inflammatory skin diseases were reactive to the monoclonal antibody (mAb) HECA-452+ in contrast to inflamed non-cutaneous tissues. It was suggested that the HECA-452 antigen is a homing receptor for lymphocyte migration into skin. This receptor was designated cutaneous lymphocyte-associated antigen or CLA and subsequently identified as a group of related sugar moieties. E-selectin, formerly known as ELAM-1 expressed by the endothelium has been implicated to be a counter-receptor for CLA. In this study, we investigated the adhesion of HECA-452+ leucocytes, i.e. freshly isolated neutrophils and B-cell line BV173 to tumour necrosis factor-alpha (TNF-alpha)-stimulated (E-selectin+) endothelial cells. We found that the adhesion of these cells could be inhibited significantly by mAb HECA-452, in a similar fashion to CSLEX1, a mAb specific for E-selectin ligand sialyl Lewisx. This inhibiting effect of both mAb on the adhesion of polymorphonuclear leucocytes (PMN) and BV173 could only be demonstrated when the assay was performed at 4 degrees, but not at 37 degrees. Furthermore, using immunohistochemical analysis we found that the mAb HECA-452-reactive epitope is different from that recognized by CSLEX1. The present results give direct evidence that the antigen recognized by HECA-452 is involved in the adhesion of leucocytes to endothelial cells, although this antigenic epitope is different from that reactive to CSLEX1.
journal_name
Immunologyjournal_title
Immunologyauthors
De Boer OJ,Horst E,Pals ST,Bos JD,Das PKsubject
Has Abstractpub_date
1994-03-01 00:00:00pages
359-65issue
3eissn
0019-2805issn
1365-2567journal_volume
81pub_type
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