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Blood-thirsty: S1PR5 and TRM.

Victoria M Hallisey1, Susan R Schwab1

  • 1Skirball Institute of Biomolecular Medicine, New York University Grossman School of Medicine, New York, NY.

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|October 29, 2021
PubMed
Summary
This summary is machine-generated.

Sphingosine 1-phosphate receptor 5 (S1PR5) inhibits tissue-resident memory T cell (TRM) formation. Tissue-derived TGF-β restricts S1PR5 expression on infiltrating T cells, impacting TRM development.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Tissue-resident memory T cells (TRMs) are crucial for adaptive immunity.
  • Understanding factors that regulate TRM formation is vital for vaccine development and immunotherapy.
  • Sphingosine 1-phosphate receptors (S1PRs) are known regulators of lymphocyte trafficking and function.

Purpose of the Study:

  • To investigate the role of sphingosine 1-phosphate receptor 5 (S1PR5) in the formation of tissue-resident memory T cells (TRMs).
  • To identify mechanisms by which S1PR5 expression is regulated in T cells infiltrating tissues.

Main Methods:

  • Flow cytometry analysis of T cell populations.
  • Gene expression analysis of S1PR5 in T cells.
  • In vivo models to study T cell homing and retention.
  • In vitro stimulation assays with TGF-β.

Main Results:

  • S1PR5 expression was found to significantly impair the formation of functional TRMs.
  • Tissue-derived transforming growth factor-beta (TGF-β) was identified as a key regulator limiting S1pr5 expression on infiltrating T cells.
  • Reduced S1PR5 expression correlated with enhanced TRM development.

Conclusions:

  • S1PR5 acts as a potent inhibitor of tissue-resident memory T cell generation.
  • TGF-β in the tissue microenvironment plays a critical role in modulating S1PR5 expression and thereby promoting TRM formation.
  • Targeting the S1PR5 pathway or leveraging TGF-β signaling could offer novel strategies for enhancing T cell-mediated immunity.