| First Author | Holländer GA | Year | 1996 |
| Journal | Proc Natl Acad Sci U S A | Volume | 93 |
| Issue | 10 | Pages | 4994-8 |
| PubMed ID | 8643517 | Mgi Jnum | J:82370 |
| Mgi Id | MGI:2652693 | Doi | 10.1073/pnas.93.10.4994 |
| Citation | Hollander GA, et al. (1996) Induction of alloantigen-specific tolerance by B cells from CD40-deficient mice. Proc Natl Acad Sci U S A 93(10):4994-8 |
| abstractText | Interaction between CD40 on B cells and CD40 ligand molecules on T cells is pivotal for the generation of a thymus-dependent antibody response. Here we show that B cells deficient in CD40 expression are unable to elicit the proliferation of allogeneic T cells in vitro. More importantly, mice immunized with CD40-/- B cells become tolerant to allogeneic major histocompatibility complex (MHC) antigens as measured by a mixed lymphocyte reaction and cytotoxic T-cell assay. The failure of CD40-/- B cells to serve as antigen presenting cells in vitro was corrected by the addition of anti-CD28 mAb. Moreover, lipopolysaccharide stimulation, which upregulates B7 expression, reversed the inability of CD40-/- B cells to stimulate an alloresponse in vitro and abrogated the capacity of these B cells to induce tolerance in vivo. These results suggest that CD40 engagement by CD40 ligand expressed on antigen-activated T cells is critical for the upregulation of B7 molecules on antigen-presenting B cells that subsequently deliver the costimulatory signals necessary for T-cell proliferation and differentiation. Our experiments suggest a novel strategy for the induction of antigen-specific tolerance in vivo. |
