Interleukin-23 promotes Th17 differentiation by inhibiting T-bet and FoxP3 and is required for elevation of interleukin-22, but not interleukin-21, in autoimmune experimental arthritis

Arthritis and Rheumatism
A M C MusErik Lubberts

Abstract

To examine the role of interleukin-23 (IL-23) in subgroup polarization of IL-17A-positive and/or interferon-gamma (IFNgamma)-positive T cells in autoimmune disease-prone DBA/1 mice with and without collagen-induced arthritis. A magnetic-activated cell sorting system was used to isolate CD4+ T cells from the spleen of naive and type II collagen (CII)-immunized DBA/1 mice. These CD4+ T cells were stimulated in vitro under Th0, Th1, or different Th17 culture conditions. Intracellular staining for IL-17A and IFNgamma was evaluated by flow cytometry. In addition, Th17 cytokines and T helper-specific transcription factors were analyzed by enzyme-linked immunosorbent assay and/or quantitative polymerase chain reaction. In CD4+ T cells from naive DBA/1 mice, IL-23 alone hardly induced retinoic acid-related orphan receptor gammat (RORgammat), Th17 polarization, and Th17 cytokines, but it inhibited T-bet expression. In contrast, transforming growth factor beta1 (TGFbeta1)/IL-6 was a potent inducer of RORgammat, RORalpha, IL-17A, IL-17F, IL-21, and FoxP3 in these cells. In contrast to TGFbeta1/IL-6, IL-23 was critical for the induction of IL-22 in CD4+ T cells from both naive and CII-immunized DBA/1 mice. Consistent with these findings, I...Continue Reading

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