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Updated: Oct 26, 2025

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NR4A3 Mediates Thymic Negative Selection.

Salix Boulet1, Livia Odagiu1,2, Mengqi Dong1,2

  • 1Maisonneuve-Rosemont Hospital Research Center, Montreal, Quebec, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|July 27, 2021
PubMed
Summary
This summary is machine-generated.

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The orphan nuclear receptor NR4A3 is crucial for preventing the accumulation of self-reactive T cells during development. Its absence leads to autoimmune diabetes in mice, highlighting its role in central tolerance.

Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • Central tolerance prevents T lymphocytes from attacking self-tissues.
  • Negative selection eliminates high-affinity self-reactive thymocytes.
  • The role of orphan nuclear receptor NR4A3 in this process was previously uninvestigated.

Purpose of the Study:

  • To investigate the function of NR4A3 in T cell negative selection.
  • To determine if NR4A3 is necessary for limiting self-reactive thymocyte accumulation.

Main Methods:

  • Analyzing NR4A3 expression in thymocytes.
  • Comparing thymocyte populations in NR4A3-deficient and wild-type mice.
  • Utilizing bone marrow reconstitution models with NR4A3-deficient or sufficient cells.

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Last Updated: Oct 26, 2025

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14:29

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Published on: October 8, 2012

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Preparation and Applications of Organotypic Thymic Slice Cultures
10:10

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Isolation and Transplantation of Different Aged Murine Thymic Grafts.
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Main Results:

  • NR4A3 transcription is upregulated in thymocytes destined for negative selection.
  • NR4A3-deficient mice exhibit accumulation of self-reactive thymocytes and increased T regulatory cells.
  • Absence of NR4A3 leads to autoreactive CD8 thymocyte accumulation and autoimmune diabetes in a model system.

Conclusions:

  • NR4A3 plays a critical role in T cell negative selection.
  • NR4A3 is essential for preventing the development of autoimmunity by limiting self-reactive T cells.