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An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
09:09

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Published on: April 18, 2016

Expression and function of mixed lineage kinases in dendritic cells

Matthew E Handley1, Jane Rasaiyaah, James Barnett

  • 1Department of Immunology and Molecular Pathology, University College London, Windeyer Institute, 46 Cleveland Street, London W1T 4JF, UK.

International Immunology
|August 19, 2007
PubMed

Insights

Mixed lineage kinases (MLKs) are crucial for dendritic cell (DC) activation. MLK inhibition blocks T cell immunity induction via specific pattern recognition receptor (PRR) ligands, highlighting their selective role in DC responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Signal Transduction

Background:

  • Dendritic cells (DCs) are key immune sentinels that initiate adaptive T cell immunity.
  • Pattern recognition receptors (PRRs) on DCs recognize microbial structures, triggering DC activation and migration.
  • Mitogen-activated protein kinases (MAPKs) mediate DC activation, but upstream pathways remain unclear.

Purpose of the Study:

  • To investigate the role of mixed lineage kinases (MLKs) in dendritic cell activation.
  • To determine if MLKs act as intermediaries between PRR ligation and MAPK activation in DCs.

Main Methods:

  • Utilized a well-established dendritic cell model.
  • Analyzed MLK mRNA and protein expression in DCs.
  • Stimulated DCs with various PRR ligands (LPS, poly(I:C), zymosan).
  • Assessed MLK phosphorylation and downstream MAPK activation (p38, JNK) upon MLK inhibition with CEP11004.
  • Measured DC activation markers (cell-surface expression) and cytokine secretion.

Main Results:

  • MLK2, MLK3, MLK4, and DLK mRNA and MLK2, MLK3, and DLK protein were detected in DCs.
  • LPS and poly(I:C) stimulation induced MLK3 phosphorylation, unlike zymosan.
  • MLK inhibition with CEP11004 blocked p38 and JNK activation in response to LPS and poly(I:C), but not zymosan.
  • MLK inhibition impaired DC activation, evidenced by reduced cell-surface marker expression and cytokine secretion.

Conclusions:

  • MLKs are expressed in dendritic cells and play a significant role in their activation.
  • The involvement of MLKs in DC activation is stimulus-dependent, suggesting a selective signaling pathway.
  • MLKs represent a potential therapeutic target for modulating adaptive immune responses initiated by DCs.

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