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Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
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Beta-catenin signaling drives differentiation and proinflammatory function of IRF8-dependent dendritic cells

Sara B Cohen1, Norah L Smith1, Courtney McDougal1

  • 1Department of Microbiology and Immunology, Cornell University College of Veterinary Medicine, Ithaca, NY 14867

Journal of Immunology (Baltimore, Md. : 1950)
|November 23, 2014
PubMed

Insights

Beta-catenin directs dendritic cell (DC) development via IRF8 activation, promoting immune responses. This finding reveals a new role for beta-catenin in orchestrating immunity during infection.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Beta-catenin signaling is linked to tolerogenic dendritic cells (DCs).
  • The precise role of beta-catenin in DC subset development and function remains largely unexplored.

Purpose of the Study:

  • To elucidate the novel role of beta-catenin in directing dendritic cell subset development.
  • To investigate the mechanism by which beta-catenin influences DC differentiation and immune responses.

Main Methods:

  • Analysis of beta-catenin expression in splenic DC precursors.
  • Induction of constitutive beta-catenin activation in CD11c+ DCs in mice.
  • Assessment of IRF8 (IFN regulatory factor 8) upregulation and its effect on DC subsets (CD8a+, plasmacytoid, CD103+ CD11b2-).
  • Measurement of IL-12 secretion from DCs upon microbial stimulation.
  • Pharmacological inhibition of beta-catenin.
  • Evaluation of Th1 and CD8+ T lymphocyte responses in mice infected with Toxoplasma gondii and vaccinia virus.

Main Results:

  • Splenic DC precursors express beta-catenin.
  • Constitutive beta-catenin activation in DCs led to IRF8 upregulation and expansion of IRF8-dependent DC subsets.
  • Beta-catenin-stabilized CD8a+ DCs showed increased IL-12 secretion upon microbial challenge.
  • Pharmacological beta-catenin inhibition reduced IL-12 secretion in wild-type DCs.
  • Mice with stabilized DC beta-catenin exhibited enhanced Th1 and CD8+ T cell responses during infections.

Conclusions:

  • Beta-catenin plays a critical role in directing dendritic cell differentiation.
  • Beta-catenin activation promotes the development of DC subsets that drive proinflammatory immunity.
  • This study uncovers a novel function for beta-catenin in immune regulation during infection.

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