IL-7 promotes long-term in vitro survival of unique long-lived memory subset generated from mucosal effector memory CD4+ T cells in chronic colitis mice

Masahiro Takahara, Yasuhiro Nemoto, Shigeru Oshima, Yu Matsuzawa, Takanori Kanai, Ryuichi Okamoto, Kiichiro Tsuchiya, Tetsuya Nakamura, Kazuhide Yamamoto, Mamoru Watanabe

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3 Citations (Scopus)

Abstract

Colitogenic memory CD4+ T cells are important in the pathogenesis of inflammatory bowel disease (IBD). Although memory stem cells with high survival and self-renewal capacity were recently identified in both mice and humans, it is unclear whether a similar subset is present in chronic colitis mice. We sought to identify and purify a long-lived subset of colitogenic memory CD4+ T cells, which may be targets for treatment of IBD. A long-lived subset of colitogenic memory CD4+ T cells was purified using a long-term culture system. The characteristics of these cells were assessed. Interleukin (IL)-7 promoted the in vitro survival for >8 weeks of lamina propria (LP) CD4+ T cells from colitic SCID mice previously injected with CD4+CD45RBhigh T cells. These cells were in a quiescent state and divided a maximum of 5 times in 4 weeks. LP CD4+ T cells expressed higher levels of Bcl-2, integrin-α4β7, CXCR3 and CD25 after than before culture, as well as secreting high concentrations of IL-2 and low concentrations of IFN-γ and IL-17 in response to intestinal bacterial antigens. LP CD4+ T cells from colitic mice cultured with IL-7 for 8 weeks induced more severe colitis than LP CD4+ T cells cultured for 4 weeks. We developed a novel culture system to purify a long-lived, highly pathogenic memory subset from activated LP CD4+ T cells. IL-7 promoted long-term in vitro survival of this subset in a quiescent state. This subset will be a novel, effective target for the treatment of IBD.

Original languageEnglish
Pages (from-to)82-93
Number of pages12
JournalImmunology Letters
Volume156
Issue number1-2
DOIs
Publication statusPublished - Nov 2013

Keywords

  • CD4
  • Cell culture
  • IL-7
  • Inflammatory bowel disease
  • Memory T cells

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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    Takahara, M., Nemoto, Y., Oshima, S., Matsuzawa, Y., Kanai, T., Okamoto, R., Tsuchiya, K., Nakamura, T., Yamamoto, K., & Watanabe, M. (2013). IL-7 promotes long-term in vitro survival of unique long-lived memory subset generated from mucosal effector memory CD4+ T cells in chronic colitis mice. Immunology Letters, 156(1-2), 82-93. https://doi.org/10.1016/j.imlet.2013.09.001