PMID- 1386872 OWN - NLM STAT- MEDLINE DCOM- 19920916 LR - 20190508 IS - 0022-1007 (Print) IS - 1540-9538 (Electronic) IS - 0022-1007 (Linking) VI - 176 IP - 2 DP - 1992 Aug 1 TI - Demonstration of a second ligand for the low affinity receptor for immunoglobulin E (CD23) using recombinant CD23 reconstituted into fluorescent liposomes. PG - 389-97 AB - Recombinant full-length human CD23 has been incorporated into fluorescent liposomes to demonstrate the existence of a ligand for CD23 that is different from the previously known ligand, immunoglobulin E (IgE). The novel ligand for CD23 is expressed on subsets of normal T cells and B cells as well as on some myeloma cell lines. The interaction of full-length CD23 with its ligand is specifically inhibited by anti-CD23 monoclonal antibodies and by IgE, and it is Ca2+ dependent. Moreover, tunicamycin treatment of a CD23-binding cell line, RPMI 8226, significantly reduced the binding of CD23 incorporated into fluorescent liposomes, and a sugar, fucose-1-phosphate, was found to inhibit CD23-liposome binding to RPMI 8226 cells, suggesting the contribution of sugar structures on the CD23 ligand. In addition, CD23-transfected COS cells were shown to form specific conjugates with the cell line RPMI 8226. These data demonstrate that CD23 interacts with a ligand, which is different from IgE, and that CD23 can be considered as a new surface adhesion molecule involved in cell-cell interactions. FAU - Pochon, S AU - Pochon S AD - Glaxo Institute for Molecular Biology, Plan-Les-Ouates, Geneva, Switzerland. FAU - Graber, P AU - Graber P FAU - Yeager, M AU - Yeager M FAU - Jansen, K AU - Jansen K FAU - Bernard, A R AU - Bernard AR FAU - Aubry, J P AU - Aubry JP FAU - Bonnefoy, J Y AU - Bonnefoy JY LA - eng PT - Journal Article PL - United States TA - J Exp Med JT - The Journal of experimental medicine JID - 2985109R RN - 0 (Antibodies, Monoclonal) RN - 0 (Antigens, CD) RN - 0 (Antigens, Differentiation, B-Lymphocyte) RN - 0 (Fluorescent Dyes) RN - 0 (Ligands) RN - 0 (Liposomes) RN - 0 (Receptors, Fc) RN - 0 (Receptors, IgE) RN - 0 (Recombinant Proteins) RN - 11089-65-9 (Tunicamycin) RN - 37341-29-0 (Immunoglobulin E) RN - SY7Q814VUP (Calcium) SB - IM MH - Antibodies, Monoclonal MH - Antibody Specificity MH - Antigens, CD/immunology/*metabolism MH - Antigens, Differentiation, B-Lymphocyte/immunology/*metabolism MH - Blotting, Western MH - Calcium/metabolism MH - Cell Line MH - Flow Cytometry MH - Fluorescent Dyes MH - Humans MH - Immunoglobulin E/immunology/*metabolism MH - Ligands MH - Liposomes/immunology/*metabolism MH - Lymphocyte Subsets/metabolism MH - Receptors, Fc/immunology/*metabolism MH - Receptors, IgE MH - Recombinant Proteins/immunology/metabolism MH - Transfection MH - Tumor Cells, Cultured MH - Tunicamycin/pharmacology PMC - PMC2119325 EDAT- 1992/08/01 00:00 MHDA- 1992/08/01 00:01 PMCR- 1993/02/01 CRDT- 1992/08/01 00:00 PHST- 1992/08/01 00:00 [pubmed] PHST- 1992/08/01 00:01 [medline] PHST- 1992/08/01 00:00 [entrez] PHST- 1993/02/01 00:00 [pmc-release] AID - 92364541 [pii] AID - 10.1084/jem.176.2.389 [doi] PST - ppublish SO - J Exp Med. 1992 Aug 1;176(2):389-97. doi: 10.1084/jem.176.2.389.