title: Regulation of B cell growth and differentiation via CD21 and CD40.
abstract: Stimulation in vitro of murine splenic B cells by lipopolysaccharide, anti-kappa Sepharose, anti-CD40 or allo-reactive T helper cells all up-regulated CD21 and CD23 surface expression. Neither anti-CD21 nor anti-CD23 antibodies induced B cell growth or differentiation when added in soluble form or coupled to Sepharose. However, anti-CD40-stimulated B cells showed increased proliferation in the presence of anti-CD21 antibodies coupled to Sepharose; co-stimulation via CD21 also induced differentiation to immunoglobulin secretion in a fraction of anti-CD40-stimulated B cells. Furthermore, anti-CD40 antibodies inhibited differentiation to immunoglobulin secretion induced by lipopolysaccharide and, hence, appears to be a dominant negative signal for B cell differentiation.
authors.affiliation: Department of Cell and Molecular Biology, Lund University, Sweden. Karol.Axcrona@immuno.lu.se
authors.forename: K
authors.initials: K
authors.lastname: Axcrona
authors.forename: D
authors.initials: D
authors.lastname: Gray
authors.forename: T
authors.initials: T
authors.lastname: Leanderson
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000502:physiology*; D019013:CD40 Antigens / Q000502:physiology*; D002454:Cell Differentiation; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D017464:Receptors, Complement 3d / Q000502:physiology*
chemical_list: D019013:CD40 Antigens; D008070:Lipopolysaccharides; D017464:Receptors, Complement 3d