title: Targeting cytotoxic T cells to antigen-specific B lymphocytes.
abstract: A recent development in immunomanipulation involves the targeting of cytotoxic T lymphocytes (CTL) to cell-bound antigens using bispecific antibodies. These antibodies have been engineered such that specificity is directed against the T cell receptor (TCR) or TCR-associated T3 molecules, as well as against the chosen antigen. The present study was aimed to force interactions between T and B cells by bridging their receptors. F23.1 antibodies, which are specific for gene products of the TCR V beta 8 gene family, were conjugated with TNP (2,4,6-trinitrophenyl) and this construct was used to bridge the receptors of V beta 8+ T cells with the receptors of TNP-specific B cells. The bridging was demonstrated by direct killing of both a TNP-specific B hybridoma and of blast cells from mice transgenic for mu, kappa of the TNP-specific antibody Sp6. Further, F23.1-TNP constructs in conjunction with V beta 8+ CTL were shown to specifically deplete Ig-secreting B cells from Sp6 transgenic mice. Conjugates of TCR-specific antibodies and antigen are theoretically useful in vivo to either deplete or expand B cells of a given specificity by coupling their receptors to the TCR of CTL or T helper cells, respectively.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D007111:Immunity, Cellular; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D051379:Mice; D011947:Receptors, Antigen, B-Cell / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014301:Trinitrobenzenes / Q000276:immunology
chemical_list: D007140:Immunoglobulin Fab Fragments; D011947:Receptors, Antigen, B-Cell; D011948:Receptors, Antigen, T-Cell; D014301:Trinitrobenzenes