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Related Experiment Video

Updated: Feb 9, 2026

Co-Culture and Transduction of Murine Thymocytes on Delta-Like 4-Expressing Stromal Cells to Study Oncogenes in T-Cell Leukemia
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Double-positive thymocytes select mucosal-associated invariant T cells.

Natalie Seach1, Lucia Guerri, Lionel Le Bourhis

  • 1INSERM U932, Institut Curie, Paris 75005, France.

Journal of Immunology (Baltimore, Md. : 1950)
|November 19, 2013
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The study identifies CD4(+)CD8(+) double positive thymocytes as crucial for selecting mucosal-associated invariant T (MAIT) cells, a process previously unknown. This finding reveals a shared selection mechanism with Natural Killer T (NKT) cells.

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Area of Science:

  • Immunology
  • T cell development
  • Innate lymphoid cells

Background:

  • Natural Killer T (NKT) and mucosal-associated invariant T (MAIT) cells share features like semi-invariant T cell receptors (TCRs) and recognition of nonclassical MHC class Ib molecules.
  • Distinct developmental pathways exist for NKT and MAIT cells, with NKTs developing effector properties in the thymus, while MAIT cells mature post-thymic export influenced by gut microbiota and B cells.

Purpose of the Study:

  • To identify the specific hematopoietic cell type responsible for the positive selection of MAIT cell progenitors during thymic development.
  • To investigate potential shared selection mechanisms between NKT and MAIT cell subsets.

Main Methods:

  • Utilized reaggregated thymic organ cultures and bone marrow chimeras in mice.
  • Employed transgenic mouse models (iVα19 and Vβ6) to track MAIT cell progenitors.
  • Performed in vitro cocultures with thymocytes and bacterial ligands.

Main Results:

  • Demonstrated that MHC-related 1-expressing CD4(+)CD8(+) double positive thymocytes are essential for MAIT cell progenitor selection.
  • Showed that thymic B cells, macrophages, and dendritic cells are dispensable for MAIT cell selection.
  • Found that bacterial ligand exposure enhances MHC-related 1 expression on double positive thymocytes and boosts mature MAIT cell activation.

Conclusions:

  • Identified CD4(+)CD8(+) double positive thymocytes as the key cell type for MAIT cell positive selection in the thymus.
  • Revealed a common cell type for the selection of both NKT and MAIT cell subsets, suggesting shared developmental pathways.
  • Highlighted the role of MHC-related 1 and bacterial ligands in MAIT cell selection and activation, prompting further investigation into divergent subset-specific features.