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J. Exp. Med., Volume 189, Number 2, January 18, 1999 241-252

The Cutaneous Lymphocyte Antigen Is an Essential Component of the L-selectin Ligand Induced on Human Vascular Endothelial Cells

By LiLi Tu,* Martha D. Delahunty,* Han Ding,Dagger Francis W. Luscinskas,Dagger and Thomas F. Tedder*

From the * Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710; and Dagger  Vascular Research Division, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02160

L-selectin mediates leukocyte rolling on vascular endothelium during inflammation. Although vascular endothelium can be activated with inflammatory cytokines to express functional L-selectin ligands, these ligands have not been well characterized. In this study, fucosyltransferase VII cDNA (Fuc-TVII) transfection of the EA.hy926 human vascular endothelial cell line (926-FtVII) induced functional L-selectin ligand expression and expression of sialyl Lewisx (sLex), as defined by HECA-452 (cutaneous lymphocyte antigen; CLA) and CSLEX-1 mAbs. Cytokine activation of human umbilical vein endothelial cells (HUVEC) also induced functional L-selectin ligand expression, with increased CLA expression and Fuc-TVII transcription. The majority of L-selectin-dependent lymphocyte attachment to activated HUVEC and 926-FtVII cells was blocked specifically by treating the endothelial cells with the HECA-452 mAb, but not the CSLEX-1 mAb. CLA-bearing ligands on vascular endothelium also required sulfation and appropriate molecular scaffolds for functional activity, but were distinct from the L-selectin ligands previously identified by the MECA-79 mAb. These findings demonstrate that the HECA-452- defined antigen, CLA, is an essential carbohydrate component of vascular L-selectin ligands.

Key words: L-selectin;  cutaneous lymphocyte antigen;  endothelium;  human leukocytes;  adhesion


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