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Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
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Insm1 regulates mTEC development and immune tolerance.

Weihua Tao1,2,3,4, Zhihuan Ye1,2,3, Yiqiu Wei1,2,3

  • 1The First Affiliated Hospital of Jinan University, Guangzhou, China.

Cellular & Molecular Immunology
|November 22, 2023
PubMed
Summary
This summary is machine-generated.

Insm1, a protein, is crucial for immune tolerance by regulating self-antigen expression in thymic cells. Its loss in mice leads to autoimmune disease, highlighting its role in maintaining self-recognition.

Keywords:
Autoimmune regulator (Aire)AutoimmunityInsulinoma-associated protein 1 (Insm1)Medullary thymic epithelial cells (mTECs)Mimetic cellsTissue-restricted antigens (TRAs)

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Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • Medullary thymic epithelial cells (mTECs) express self-antigens to establish immune tolerance.
  • The regulatory network governing self-antigen expression in mTECs is not well understood.
  • Autoimmune Regulator (Aire) is a key transcription factor in mTEC function.

Purpose of the Study:

  • To investigate the role of Insm1, a zinc finger protein, in mTEC function and immune tolerance.
  • To elucidate the regulatory mechanisms of self-antigen expression in the thymus.
  • To determine the impact of Insm1 deficiency on autoimmune responses.

Main Methods:

  • Co-expression analysis of Insm1 and Aire in mTECs.
  • Generation and analysis of Insm1 mutant mice.
  • Gene expression profiling and chromatin binding studies.
  • Assessment of autoimmune responses in peripheral tissues.

Main Results:

  • Insm1 is coexpressed with Aire in mTECs and persists in neuroendocrine mimetic cells.
  • Insm1 mutation downregulates Aire, dysregulates mTEC gene expression, and alters mTEC subpopulations.
  • Loss of Insm1 leads to autoimmune responses.
  • Insm1 regulates gene expression in mTECs via chromatin binding, often co-occupied by Aire in superenhancers.

Conclusions:

  • Insm1 plays a critical role in regulating the repertoire of self-antigens expressed by mTECs.
  • Insm1 is essential for establishing and maintaining immune tolerance.
  • Dysregulation of Insm1 contributes to the development of autoimmune diseases.