| First Author | Mohr E | Year | 2010 |
| Journal | Proc Natl Acad Sci U S A | Volume | 107 |
| Issue | 40 | Pages | 17292-7 |
| PubMed ID | 20855629 | Mgi Jnum | J:165414 |
| Mgi Id | MGI:4837280 | Doi | 10.1073/pnas.1004879107 |
| Citation | Mohr E, et al. (2010) IFN-{gamma} produced by CD8 T cells induces T-bet-dependent and -independent class switching in B cells in responses to alum-precipitated protein vaccine. Proc Natl Acad Sci U S A 107(40):17292-7 |
| abstractText | Alum-precipitated protein (alum protein) vaccines elicit long-lasting neutralizing antibody responses that prevent bacterial exotoxins and viruses from entering cells. Typically, these vaccines induce CD4 T cells to become T helper 2 (Th2) cells that induce Ig class switching to IgG1. We now report that CD8 T cells also respond to alum proteins, proliferating extensively and producing IFN-gamma, a key Th1 cytokine. These findings led us to question whether adoptive transfer of antigen-specific CD8 T cells alters the characteristic CD4 Th2 response to alum proteins and the switching pattern in responding B cells. To this end, WT mice given transgenic ovalbumin (OVA)-specific CD4 (OTII) or CD8 (OTI) T cells, or both, were immunized with alum-precipitated OVA. Cotransfer of antigen-specific CD8 T cells skewed switching patterns in responding B cells from IgG1 to IgG2a and IgG2b. Blocking with anti-IFN-gamma antibody largely inhibited this altered B-cell switching pattern. The transcription factor T-bet is required in B cells for IFN-gamma-dependent switching to IgG2a. By contrast, we show that this transcription factor is dispensable in B cells both for IFN-gamma-induced switching to IgG2b and for inhibition of switching to IgG1. Thus, T-bet dependence identifies distinct transcriptional pathways in B cells that regulate IFN-gamma-induced switching to different IgG isotypes. |
