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Related Experiment Video

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BLIMP-1 and CEACAM1 cooperatively regulate human Treg homeostasis and function to control xenogeneic GVHD.

Ying Ding1, Aixin Yu1, Milos Vujanac1

  • 1Department of Microbiology and Immunology, Miller School of Medicine, University of Miami, Miami, Florida, USA.

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|August 7, 2025
PubMed
Summary

Regulatory T cells (Tregs) control immune tolerance. BLIMP-1 limits human Treg proliferation while supporting function, working with CEACAM1 in an IL-2 feedback loop to regulate Treg activity and expansion.

Keywords:
Adaptive immunityAutoimmune diseasesAutoimmunityImmunologyImmunotherapy

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Regulatory T cells (Tregs) are crucial for maintaining peripheral tolerance.
  • Treg homeostasis and function rely on T cell receptor (TCR) and IL-2 receptor (IL-2R) signaling.
  • BLIMP-1 is known to influence Treg homeostasis in mice, but its role in human Tregs is unclear.

Purpose of the Study:

  • To elucidate the mechanisms of BLIMP-1 action in human Tregs.
  • To investigate the interplay between BLIMP-1, CEACAM1, and IL-2 signaling in Treg regulation.
  • To assess the therapeutic potential of targeting this pathway in autoimmune diseases.

Main Methods:

  • CRISPR/Cas9 gene editing to ablate BLIMP-1 in human Tregs.
  • Analysis of gene expression, signaling pathways (e.g., mTOR), and cell proliferation.
  • Utilizing a humanized mouse model of xenogeneic graft versus host disease.
  • Assessing CEACAM1 expression in Tregs from patients undergoing low-dose IL-2 therapy.

Main Results:

  • BLIMP-1 limits human Treg proliferation but enhances IL-10, CTLA4, and immune checkpoint expression, including CEACAM1.
  • BLIMP-1 restrains Treg expansion by downregulating CD25/IL-2R signaling and upregulating CEACAM1, which inhibits mTOR activation.
  • Prolonged IL-2R signaling enhances BLIMP-1 expression, promoting CEACAM1 induction via STAT5 and BLIMP-1 enhancers.
  • CEACAM1 is highly expressed on Tregs from autoimmune patients on low-dose IL-2 therapy, correlating with reduced proliferation.
  • BLIMP-1 promotes Treg suppressive activity, while CEACAM1 restrains it in a GvHD model.

Conclusions:

  • BLIMP-1 and CEACAM1 form an IL-2-dependent feedback loop that restrains Treg proliferation and modulates suppressive function.
  • CEACAM1 serves as a sensitive biomarker for IL-2R signaling in human T cells.
  • These findings offer insights into Treg regulation and potential therapeutic strategies for autoimmune disorders.