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A tissue checkpoint regulates type 2 immunity.

Steven J Van Dyken1, Jesse C Nussbaum1, Jinwoo Lee1

  • 1Department of Medicine, University of California, San Francisco, San Francisco, California, USA.

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|November 1, 2016
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Summary
This summary is machine-generated.

Group 2 innate lymphoid cells (ILC2s) and CD4+ T helper 2 (TH2) cells share effector functions in allergic immunity. Tissue-derived cytokines IL-25, IL-33, and TSLP control their terminal differentiation and lung inflammation.

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Area of Science:

  • Immunology
  • Allergy Research
  • Cellular Biology

Background:

  • Group 2 innate lymphoid cells (ILC2s) and CD4+ T helper 2 (TH2) cells are key players in allergic immunity, sharing similar effector cytokines.
  • Their distinct differentiation pathways and overlapping effector functions are critical for orchestrating immune responses.

Purpose of the Study:

  • To investigate the shared mechanisms regulating the effector functions of ILC2s and TH2 cells.
  • To identify the role of tissue-derived cytokines in the terminal differentiation of these cells and subsequent allergic inflammation.

Main Methods:

  • Analysis of ILC2 and TH2 cell differentiation and function.
  • Investigation of the impact of key tissue-derived cytokines (IL-25, IL-33, TSLP) on immune cell priming and effector responses.
  • Assessment of adaptive lung inflammation in response to cytokine signaling loss.

Main Results:

  • ILC2s and TH2 cells differentiate independently but share effector programs driven by IL-25, IL-33, and TSLP.
  • Loss of these three cytokines abrogated TH2 cell terminal differentiation and adaptive lung inflammation in a T cell-intrinsic manner.
  • Lymph node priming remained unaffected by the absence of these tissue signals.

Conclusions:

  • A shared, local-tissue-elicited checkpoint regulates both innate and adaptive type 2 immunity.
  • These findings provide a mechanism for controlling innate and adaptive allergic inflammation by targeting this checkpoint.