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Selective regulation of interleukin-10 production via Janus kinase pathway in murine conventional dendritic cells

Noriyuki Hirata1, Yoshiki Yanagawa, Kazuya Iwabuchi

  • 1Division of Immunobiology, Institute for Genetic Medicine, Hokkaido University, Kita-ku, Sapporo, Japan.

Cellular Immunology
|April 14, 2009
PubMed

Insights

This study reveals that the JAK-PI3K pathway is crucial for dendritic cells (DCs) to produce IL-10, an anti-inflammatory cytokine. Inhibiting this pathway blocks IL-10 production, impacting cytokine balance.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Dendritic cells (DCs) play a critical role in regulating immune responses.
  • Maintaining the balance between inflammatory and anti-inflammatory cytokines is essential for immune homeostasis.

Purpose of the Study:

  • To investigate the role of Janus kinases (JAKs) in regulating the balance of inflammatory versus anti-inflammatory cytokines in murine conventional DCs.
  • To elucidate the signaling pathways involved in IL-10 production by DCs.

Main Methods:

  • Murine conventional dendritic cells (DCs) were stimulated with highly purified lipopolysaccharide (upLPS) and imiquimod (IQ).
  • JAK pathway inhibitor I (JAKi) and PI3K inhibitor LY294002 were used to block specific signaling pathways.
  • Cytokine production (IL-10, IL-12, IL-6, TNF-alpha) and STATs/Akt phosphorylation were measured.

Main Results:

  • upLPS plus IQ synergistically induced IL-10 production by DCs, with significant JAK2, STAT1, and STAT3 phosphorylation.
  • JAK inhibition significantly reduced IL-10 production but had negligible effects on IL-12, IL-6, and TNF-alpha.
  • JAK inhibition blocked TLR-mediated STATs activation and attenuated Akt activation. PI3K inhibition also markedly inhibited IL-10 production.

Conclusions:

  • The JAK-PI3K signaling axis is critically involved in the production of IL-10 by dendritic cells.
  • Targeting the JAK-PI3K pathway could be a strategy to modulate DC-mediated IL-10 production and influence immune responses.

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