title: Activation of B cells using Schneider 2 cells expressing CD40 ligand for the enhancement of antigen presentation in vitro.
abstract: CD40 ligand (CD40L) expressed by activated CD4+ T cells is a family member of membrane bound TNF family ligand and its interaction with CD40 expressed in APC has been shown to contribute in enhancing immune response. Exogenous stimulation through CD40 has been performed using soluble trimeric CD40L, anti-CD40 monoclonal antibody and cells expressing CD40L. Schneider 2 (S2) cells, a cell line derived from Drosophila melanogaster, was transfected with a plasmid vector, pAc5.1/V5-HisA, for the constitutive expression of CD40L (S2-CD40L). Upon incubation of S2-CD40L with B-lymphocytes for 6 days, activated B cells were examined by counting B cell numbers and for activation markers including CD86 and HLA Class II molecules. The activated B cells were tested for its efficient APC function by mixed lymphocyte reactions (MLR) and enzyme-linked Immunospot (ELISPOT) assay. S2-CD40L was cultured for a year and maintained CD40L expression (>90%). S2-CD40L induced B cell activation as demonstrated by increment of total B cells and up-regulation of CD86 and MHC Class II molecules. Activated B cells pulsed with peptide from human cytomegalovirus pp65 antigen efficiently induced both proliferation and IFN-gamma secretion of T cells. Our result suggests that S2-CD40L can efficiently and conveniently generate B cells as a functional APC and represents a potential role for B-cell mediated cancer immunotherapy.
authors.affiliation: Department of Microbiology, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
authors.forename: Sung Hee
authors.initials: SH
authors.lastname: Yoon
authors.forename: Hyun Il
authors.initials: HI
authors.lastname: Cho
authors.forename: Tai Gyu
authors.initials: TG
authors.lastname: Kim
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D051940:B7-2 Antigen / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D023201:CD40 Ligand / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D049109:Cell Proliferation; D018920:Coculture Techniques; D004331:Drosophila melanogaster; D015870:Gene Expression; D000949:Histocompatibility Antigens Class II / Q000378:metabolism; D006801:Humans; D008213:Lymphocyte Activation; D014162:Transfection
chemical_list: D051940:B7-2 Antigen; C497964:CD86 protein, human; D000949:Histocompatibility Antigens Class II; D023201:CD40 Ligand