A ligand for human CD48 on epithelial cells.
CD48 is a member of the Ig superfamily with a high degree of sequence homology to CD58 (LFA-3). In rodents, CD48 is the ligand for CD2 whereas in humans, CD58 is the ligand for CD2. Despite intensive efforts, no ligand for human CD48 has been convincingly demonstrated. We now show that a ligand for human CD48 is present on epithelial cells. The ligand was detected based on the ability of epithelial cells to bind both a decameric, soluble CD48 IgM fusion protein and monomeric CD48 immobilized on plastic dishes. mAbs raised to the ligand completely block binding of CD48 to all epithelial cells tested. We further show that the cell surface proteoglycan CD44 plays an auxiliary role in the binding of epithelial cells to CD48 and that this interaction involves the glycosaminoglycan binding site of CD44. No interaction of human CD48 with CD2 was detected. This is the first clear demonstration that human CD48 can function as an adhesion molecule and suggests a role for CD48 in lymphocyte epithelial cell interactions.
Ianelli
C J
CJ
Department of Pathology, Tufts University School of Medicine, Boston, MA 02111, USA.
Edson
C M
CM
Thorley-Lawson
D A
DA
D000818:Animals; D019138:Antibodies, Blocking / Q000737:chemistry / Q000494:pharmacology; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000494:pharmacology; D015703:Antigens, CD / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D018801:CD2 Antigens / Q000378:metabolism; D000071178:CD48 Antigen; D002448:Cell Adhesion / Q000276:immunology; D002460:Cell Line; D002522:Chlorocebus aethiops; D006224:Cricetinae; D004847:Epithelial Cells / Q000276:immunology* / Q000378:metabolism* / Q000502:physiology; D005260:Female; D006801:Humans; D018960:Hyaluronan Receptors / Q000502:physiology; D007075:Immunoglobulin M / Q000235:genetics; D008024:Ligands; D051379:Mice; D008807:Mice, Inbred BALB C; D011994:Recombinant Proteins / Q000235:genetics; D012995:Solubility; D013194:Staining and Labeling; D014407:Tumor Cells, Cultured
D019138:Antibodies, Blocking; D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018801:CD2 Antigens; D000071178:CD48 Antigen; C000604065:CD48 protein, human; C000604066:Cd48 protein, mouse; D018960:Hyaluronan Receptors; D007075:Immunoglobulin M; D008024:Ligands; D011994:Recombinant Proteins