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- W1630260836 abstract "Abstract Cognate T–B cell interactions and CD40–CD154 costimulation are essential for productive humoral immunity against T-dependent Ags. We reported that memory CD4 T cells can deliver help to B cells and induce pathogenic IgG alloantibodies in the absence of CD40–CD154 interactions. To determine cytokine requirements for CD40-independent help, we used CD40−/− mice containing differentiated subsets of donor-reactive memory Th cells as heart allograft recipients. Th1 and Th17, but not Th2, memory CD4 T cells elicited high titers of anti-donor Ab. Abs induced by Th17 memory CD4 T cells had decreased reactivity against donor MHC class I molecules and inferior ability to cause complement deposition in heart allografts compared with Abs induced by Th1 cells, suggesting a requirement for IFN-γ during CD40-independent help. IFN-γ neutralization inhibited helper functions of memory CD4 T cells in both CD40−/− recipients and wild type recipients treated with anti-CD154 mAb. Our results suggest that IFN-γ secreted by pre-existing memory helper cells determines both isotype and specificity of donor-reactive alloantibodies and can thus affect allograft pathology. This information may be valuable for identifying transplant patients at risk for de novo development of pathogenic alloantibodies and for preventing alloantibody production in T cell–sensitized recipients." @default.
- W1630260836 created "2016-06-24" @default.
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- W1630260836 date "2015-02-01" @default.
- W1630260836 modified "2023-09-27" @default.
- W1630260836 title "IFN-γ Production by Memory Helper T Cells Is Required for CD40-Independent Alloantibody Responses" @default.
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- W1630260836 doi "https://doi.org/10.4049/jimmunol.1401573" @default.
- W1630260836 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4297685" @default.
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