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N-ras couples antigen receptor signaling to Eomesodermin and to functional CD8+ T cell memory but not to effector

Salvador Iborra1, Manuel Ramos, David M Arana

  • 1Centro de Biología Molecular Severo Ochoa, CSIC/Universidad Autónoma de Madrid, E-28049 Madrid, Spain.

The Journal of Experimental Medicine
|June 19, 2013
PubMed

Insights

The small GTPase N-ras is crucial for CD8+ T cell memory formation. N-ras deficiency impairs memory cell generation by affecting Eomesodermin (Eomes) induction, highlighting N-ras

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • T cell receptor (TCR) signaling dictates CD8+ T cell effector versus memory differentiation.
  • The precise TCR signals governing memory fate remain incompletely understood.

Purpose of the Study:

  • To investigate the role of the small GTPase N-ras in CD8+ T cell effector and memory differentiation.
  • To elucidate the molecular mechanisms by which N-ras influences T cell memory development.

Main Methods:

  • Utilized N-ras-deficient mice and adoptive T cell transfer models.
  • Assessed CD8+ T cell differentiation into effector and memory populations.
  • Analyzed the induction of transcription factors T-bet and Eomesodermin (Eomes).
  • Investigated the involvement of signaling pathways including PI3K-AKT and mTOR.

Main Results:

  • N-ras-deficient CD8+ T cells efficiently generated primary effectors but showed a severe defect in protective memory formation.
  • This memory defect was partially rescued by mTOR inhibition (rapamycin).
  • Impaired antigen-mediated early induction of Eomesodermin (Eomes) was observed in N-ras-deficient cells.
  • Early Eomes induction required PI3K-AKT signaling but not ERK, and was largely rapamycin-insensitive.
  • Restoring Eomes expression in N-ras-deficient cells rescued memory differentiation.

Conclusions:

  • N-ras is a critical TCR-proximal regulator essential for early Eomesodermin (Eomes) induction.
  • N-ras plays a pivotal role in determining CD8+ T cell memory fate.
  • The N-ras-Eomes axis is a key pathway for establishing protective T cell memory.

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