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Control of IFN-γ production and regulatory function by the inducible nuclear protein IκB-ζ in T cells

2015; Oxford University Press; Volume: 98; Issue: 3 Linguagem: Inglês

10.1189/jlb.2a0814-384r

1938-3673

Takashi Maruyama, Shuhei Kobayashi, Kouetsu Ogasawara, Akihiko Yoshimura, WanJun Chen, Tatsushi Muta,

Immune Cell Function and Interaction

Abstract The transcriptional regulator IκB-ζ is important for the control of apoptosis in keratinocytes. Thus, IκB-ζ-deficient mice develop autoimmune diseases, such as Sjögren’s syndrome. However, T cells also play a pivotal role in Sjögren’s syndrome. To study the role of IκB-ζ in T cells, we generated T cell-specific, IκB-ζ-deficient mice. We observed increased numbers of peripheral effector/memory CD4+ cells and IFN-γ-producing CD4+ cells in 3-week-old mice. We found that IκB-ζ can be up-regulated by TGF-β1 in naϊve CD4+ T cells and that it negatively regulates IFN-γ expression. In addition, we generated Treg-specific, IκB-ζ deficient mice and found that IκB-ζ is dispensable for the plasticity and stability of Tregs. However, Tregs from T cell-specific, IκB-ζ-deficient mice have reduced immunoregulatory function. Thus, our data reveal a previously unappreciated role for IκB-ζ in IFN-γ production in T cells and the immunoregulatory function of Tregs.