Search results for: Rat monoclonal anti mouse 4-1BB (TNFRSF9) Anti-Mouse antibodies
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Anti-4-1BB monoclonal antibodies abrogate T cell-dependent humoral immune responses in vivo through the induction of helper T cell anergy.
The 4-1BB receptor (CDw137), a member of the tumor necrosis factor receptor superfamily, has been shown to costimulate the activation of T cells. Here we show that anti-mouse 4-1BB monoclonal antibodies (mAbs) inhibit thymus-dependent antibody production by B cells. Injection of anti-4-1BB mAbs into mice being immunized with cellular or soluble protein antigens induced long-term anergy of antigen-specific T cells. The immune response to the type II T cell-independent antigen trinintrophenol-conjugated Ficoll, however, was not suppressed. Inhibition of humoral immunity occurred only when anti-4-1BB mAb was given within 1 wk after immunization. Anti-4-1BB inhibition was observed in mice lacking functional CD8(+) T cells, indicating that CD8(+) T cells were not required for the induction of anergy. Analysis of the requirements for the anti-4-1BB-mediated inhibition of humoral immunity revealed that suppression could not be adoptively transferred with T cells from anti-4-1BB-treated mice. Transfer of BALB/c splenic T cells from sheep red blood cell (SRBC)-immunized and anti-4-1BB-treated mice together with normal BALB/c B cells into C.B-17 severe combined immunodeficient mice failed to generate an anti-SRBC response. However, B cells from the SRBC-immunized, anti-4-1BB-treated BALB/c mice, together with normal naive T cells, exhibited a normal humoral immune response against SRBC after transfer, demonstrating that SRBC-specific B cells were left unaffected by anti-4-1BB mAbs.R S Mittler, T S Bailey, K Klussman, M D Trailsmith, M K Hoffmann
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