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Clec4A4 is a regulatory receptor for dendritic cells that impairs inflammation and T-cell immunity

Tomofumi Uto1, Tomohiro Fukaya1, Hideaki Takagi1

  • 1Division of Immunology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, 889-1692, Japan.

Nature Communications
|April 13, 2016
PubMed

Insights

Clec4A4, a receptor on CD8α(-) dendritic cells (DCs), acts as a brake on immune responses. Its absence leads to heightened inflammation, autoimmunity, but also better defense against infections.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Dendritic cells (DCs) are key regulators of adaptive immunity.
  • CD8α(-) conventional DCs (cDCs) are a distinct subset involved in immune initiation.
  • Clec4A4, also known as DC immunoreceptor 2 (DCIR2), is exclusively expressed on CD8α(-) cDCs.

Purpose of the Study:

  • To investigate the role of Clec4A4 in regulating CD8α(-) cDC function.
  • To determine how Clec4A4 influences T-cell immunity and inflammatory responses.

Main Methods:

  • Utilized knockout mouse models (Clec4a4(-/-)) to study immune responses.
  • Analyzed cytokine production and T-cell priming in response to Toll-like receptor (TLR) activation.
  • Assessed immune responses during antigenic immunization and microbial infection.

Main Results:

  • Clec4A4 deficiency in CD8α(-) cDCs enhanced cytokine production and T-cell priming upon TLR activation.
  • Clec4a4(-/-) mice displayed TLR-mediated hyperinflammation and autoimmune pathogenesis.
  • Clec4a4(-/-) mice showed increased resistance to microbial infection with augmented T-cell responses.

Conclusions:

  • Clec4A4 acts as a regulatory receptor that restrains the activation of CD8α(-) cDCs.
  • Clec4A4 controls the magnitude and quality of T-cell-mediated immune responses.
  • Targeting Clec4A4 could modulate immune responses in inflammation, autoimmunity, and infection.

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