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The Role of Dendritic Cells in Central Tolerance

  • Oh, Jaehak (Department of Microbiology and Immunology, Sandler Asthma Basic Research Center, University of California San Francisco) ;
  • Shin, Jeoung-Sook (Department of Microbiology and Immunology, Sandler Asthma Basic Research Center, University of California San Francisco)
  • Received : 2015.03.31
  • Accepted : 2015.06.02
  • Published : 2015.06.30
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Abstract

Dendritic cells (DCs) play a significant role in establishing self-tolerance through their ability to present self-antigens to developing T cells in the thymus. DCs are predominantly localized in the medullary region of thymus and present a broad range of self-antigens, which include tissue-restricted antigens expressed and transferred from medullary thymic epithelial cells, circulating antigens directly captured by thymic DCs through coticomedullary junction blood vessels, and peripheral tissue antigens captured and transported by peripheral tissue DCs homing to the thymus. When antigen-presenting DCs make a high affinity interaction with antigen-specific thymocytes, this interaction drives the interacting thymocytes to death, a process often referred to as negative selection, which fundamentally blocks the self-reactive thymocytes from differentiating into mature T cells. Alternatively, the interacting thymocytes differentiate into the regulatory T (Treg) cells, a distinct T cell subset with potent immune suppressive activities. The specific mechanisms by which thymic DCs differentiate Treg cells have been proposed by several laboratories. Here, we review the literatures that elucidate the contribution of thymic DCs to negative selection and Treg cell differentiation, and discusses its potential mechanisms and future directions.

Keywords

References

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