IL-6–dependent spontaneous proliferation is required for the induction of colitogenic IL-17–producing CD8+ T cells

We propose a novel role for interleukin (IL) 6 in inducing rapid spontaneous proliferation (SP) of naive CD8+ T cells, which is a crucial step in the differentiation of colitogenic CD8+ T cells. Homeostasis of T cells is regulated by two distinct modes of cell proliferation: major histocompatibility complex/antigen–driven rapid SP and IL-7/IL-15–dependent slow homeostatic proliferation. Using our novel model of CD8+ T cell–dependent colitis, we found that SP of naive CD8+ T cells is essential for inducing pathogenic cytokine-producing effector T cells. The rapid SP was predominantly induced in mesenteric lymph nodes (LNs) but not in peripheral LNs under the influence of intestinal flora and IL-6. Indeed, this SP was markedly inhibited by treatment with anti–IL-6 receptor monoclonal antibody (IL-6R mAb) or antibiotic-induced flora depletion, but not by anti–IL-7R mAb and/or in IL-15–deficient conditions. Concomitantly with the inhibition of SP, anti–IL-6R mAb significantly inhibited the induction of CD8+ T cell–dependent autoimmune colitis. Notably, the transfer of naive CD8+ T cells derived from IL-17−/− mice did not induce autoimmune colitis. Thus, we conclude that IL-6 signaling is crucial for SP under lymphopenic conditions, which subsequently caused severe IL-17–producing CD8+ T cell–mediated autoimmune colitis. We suggest that anti–IL-6R mAb may become a promising strategy for the therapy of colitis.

• Publication year

  2008

• Venue

  Journal of Experimental Medicine

• Publication date

  2008-05-12

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1084/jem.20071133PMID 18426983PMCID 2373835
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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