title: Absence, or low expression, of leukocyte adhesion molecules CD11 and CD18 on Burkitt lymphoma cells.
abstract: Leukocyte adhesion to cells is mediated by the cell-surface glycoprotein complex CD11a-c/CD18 and, in some cases, the glycoprotein gp84. The process is associated with leukocyte activation and modulates lymphocyte proliferation and maturation. Epstein-Barr virus (EBV)-transformed normal B lymphocytes give rise to lymphoblastoid cell lines (LCLs) which grow as large clusters mediated by adhesion molecules. In contrast, newly explanted EBV-infected Burkitt lymphoma (BL) cells usually grow as single cells or as loose clusters. We now report that EBV positive- and EBV-negative BL lines lack the adhesive protein complex, or have only low levels of it, whereas LCLs, representing various stages of B-lymphocyte development, contain considerably higher amounts, as measured by immunofluorescence flow cytometry and immunoprecipitation. The level of gp84 expression is of the same magnitude in both types of cells.
mesh_terms: D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation / Q000378:metabolism*; D000954:Antigens, Surface / Q000378:metabolism; D002051:Burkitt Lymphoma / Q000378:metabolism*; D018845:CD11 Antigens; D018821:CD18 Antigens; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules; D002460:Cell Line; D005434:Flow Cytometry; D006801:Humans; D008562:Membrane Glycoproteins / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation; D000954:Antigens, Surface; D018845:CD11 Antigens; D018821:CD18 Antigens; D015815:Cell Adhesion Molecules; D008562:Membrane Glycoproteins