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Medullary thymic epithelial cells (mTECs) and cortical TECs can acquire proteins from thymocytes, broadening the range of tissue-restricted antigens (TRAs) available for establishing central tolerance and preventing autoimmunity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Central tolerance is established by eliminating self-reactive T cells in the thymus.
  • Medullary thymic epithelial cells (mTECs) express tissue-restricted antigens (TRAs) for T cell negative selection.
  • Intercellular transfer of TRAs from mTECs to dendritic cells (DCs) aids tolerance, but mTECs may not express all TRAs.

Purpose of the Study:

  • To investigate the intercellular transfer of molecules between thymocytes and thymic epithelial cells (TECs).
  • To determine if TECs can acquire both cell surface and intracellular proteins from thymocytes.
  • To assess the implications of this transfer for expanding the TRA repertoire in TECs.

Main Methods:

  • Utilized advanced microscopy and biochemical techniques to visualize and quantify protein transfer.
  • Investigated the uptake of both surface and intracellular proteins from thymocytes by mTECs and cortical TECs.
  • Analyzed the potential impact on the presentation of TRAs within the thymus.

Main Results:

  • Demonstrated efficient acquisition of both cell surface and intracellular proteins from thymocytes by both mTECs and cortical TECs.
  • Revealed a novel pathway for intercellular molecular sharing from thymocytes to TECs.
  • Indicated that this transfer broadens the repertoire of TRAs presented by TECs.

Conclusions:

  • Thymic epithelial cells can acquire proteins from thymocytes, not just present their own expressed antigens.
  • This intercellular sharing mechanism expands the available TRA inventory in TECs, particularly mTECs.
  • Enhances the capacity for establishing comprehensive central tolerance by exposing T cells to a wider array of self-antigens.