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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Contact sensitizers trigger human CD1-autoreactive T-cell responses.

Richard J Betts1,2, Adrijana Perkovic3, Subhashree Mahapatra4

  • 1Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.

European Journal of Immunology
|April 26, 2017
PubMed
Summary

Contact sensitizers, like dinitrochlorobenzene, can activate T cells via CD1 molecules, independent of MHC. This finding sheds light on the mechanisms behind allergic contact dermatitis and inflammatory skin diseases.

Keywords:
Antigen-presentationCD1Contact sensitivityNKT cellsT cells

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Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Allergic contact dermatitis is a T-cell-driven skin inflammation caused by haptens binding to proteins.
  • The role of MHC-independent antigen presentation via CD1 molecules in hapten responses is under investigation.

Purpose of the Study:

  • To investigate how contact sensitizers influence CD1-restricted T-cell immunity.
  • To explore the potential of CD1-restricted antigen presentation in allergic contact dermatitis.

Main Methods:

  • Human antigen-presenting cells (monocyte-derived dendritic cells, THP-1 cells) were exposed to contact sensitizers.
  • T-cell responses (cytokine release) were analyzed in a CD1- and T-cell receptor (TCR)-dependent manner.

Main Results:

  • Dinitrochlorobenzene potentiated CD1a- and CD1d-autoreactive T-cell responses, leading to cytokine release.
  • These effects were dependent on newly synthesized CD1 molecules and endogenous lipids.
  • Other sensitizers like 1,4-benzoquinone, resorcinol, isoeugenol, and cinnamaldehyde also activated CD1-restricted T cells.

Conclusions:

  • Contact sensitizers can directly activate skin-associated CD1-restricted T cells in an antigen-specific manner.
  • These findings offer insights into the pathogenesis of contact sensitizer-induced inflammatory skin diseases.