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RasGRP1 signaling is required for Vγ2+ thymocyte c-Maf expression and γδT17 lineage programming.

Kevin Joannou1, Dominic P Golec2, Abul K Azad1

  • 1Department of Medical Microbiology and Immunology, 6-25 Heritage Medical Research Centre, University of Alberta, Edmonton, Alberta, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|September 1, 2025
PubMed
Summary
This summary is machine-generated.

Ras guanyl-releasing protein 1 (RasGRP1) is crucial for specific γδ T cell subsets, including IL-17 producers, by integrating TCR and non-TCR signals for effector programming.

Keywords:
T cellscell differentiationrodentskinspleen and lymph nodesthymus

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Area of Science:

  • Immunology
  • Cell Biology
  • T cell development

Background:

  • The γδ T cell receptor (TCR) directs γδ T cell lineage specification and effector programming.
  • The precise coordination of TCR signal strength and auxiliary signals in γδ T cell development is not fully understood.

Purpose of the Study:

  • To investigate the role of Ras guanyl-releasing protein 1 (RasGRP1) in γδ T cell development and effector programming.
  • To elucidate how RasGRP1 integrates signals to regulate γδ T cell differentiation.

Main Methods:

  • Analysis of γδ T cell populations in RasGRP1 knockout mice.
  • Assessment of thymocyte and peripheral γδ T cell subsets (Vγ4+, CD73+, CD8+IFNγ+, Vγ2+).
  • Investigation of c-Maf expression and its regulation by RasGRP1 in response to CCR9 stimulation.

Main Results:

  • RasGRP1 is essential for generating Vγ4+ thymocytes and CD73+ γδ T cells, but not bulk γδ T cells.
  • Absence of RasGRP1 led to decreased IL-17-producing γδ T cells and loss of Vγ2+ γδ T cells with reduced c-Maf expression.
  • RasGRP1, not MEK activity, is required for CCR9-induced c-Maf expression in adult γδT17 programming.

Conclusions:

  • RasGRP1 acts as a key signaling hub in γδ T cell effector programming.
  • RasGRP1 integrates both TCR and non-TCR signals to direct γδ T cell differentiation.
  • RasGRP1 plays a critical role in the development of specific γδ T cell subsets, including IL-17 producers.