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Related Experiment Video

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Medullary Thymic Epithelial Cell Antigen-presentation Assays.

Alexia Borelli1, Cloé Zamit1, Magali Irla1

  • 1Aix-Marseille University, CNRS, INSERM, CIML, Centre d'Immunologie de Marseille-Luminy, Marseille, France.

Bio-Protocol
|November 16, 2023
PubMed
Summary

This study details a protocol to evaluate how medullary thymic epithelial cells (mTEC) present antigens to CD4+ T cells. This method is crucial for understanding T-cell tolerance and autoimmune disease development.

Keywords:
Antigen-presentation assayCD4+ T cellsCell purificationCo-cultureMedullary thymic epithelial cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Medullary thymic epithelial cells (mTEC) are critical for establishing T-cell tolerance by presenting self-antigens.
  • mTEC control the deletion of autoreactive T cells and the generation of regulatory T cells.
  • Assessing mTEC's antigen-presenting capacity is vital for understanding immune homeostasis.

Purpose of the Study:

  • To describe a detailed protocol for assessing the MHC class II antigen-presentation capacity of mTEC to CD4+ T cells.
  • To provide a method for evaluating mTEC's ability to present antigens in an antigen-specific context.
  • To enable researchers to study T-cell tolerance induction and autoimmune disease mechanisms.

Main Methods:

  • Thymus enzymatic digestion, immunostaining, and cell sorting of mTEC and CD4+ T cells.
  • Peptide-loading of mTEC followed by co-culture with CD4+ T cells.
  • Flow cytometry analysis to assess CD4+ T cell activation.

Main Results:

  • The protocol enables a rapid co-culture assay to evaluate mTEC antigen presentation.
  • Successful assessment of mTEC's capacity to present antigens to CD4+ T cells.
  • The method utilizes transgenic mice (OTIIxRag2-/-) and specific peptides (OVA323-339).

Conclusions:

  • This protocol provides a robust method for studying mTEC-mediated antigen presentation.
  • It facilitates research into T-cell tolerance and the development of autoimmune diseases.
  • The assay is adaptable for evaluating mTEC function in various immunological contexts.