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The Mammalian Sterile 20-like 1 Kinase Controls Selective CCR7-Dependent Functions in Human Dendritic Cells

Jesús Torres-Bacete1, Cristina Delgado-Martín1, Carolina Gómez-Moreira1

  • 1Departamento de Microbiología Molecular y Biología de las Infecciones, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28040 Madrid, Spain; and.

Journal of Immunology (Baltimore, Md. : 1950)
|June 28, 2015
PubMed

Insights

The mammalian sterile 20-like 1 kinase (Mst1) regulates key functions of mature dendritic cells (mDCs) controlled by the chemokine receptor CCR7. Mst1 impacts mDC cytoarchitecture, endocytosis, and migration speed, but not chemotaxis or survival.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The chemokine receptor CCR7 is crucial for mature dendritic cell (mDC) homing to lymph nodes, controlling immune responses.
  • CCR7 regulates mDC functions including migration, endocytosis, and survival, but the underlying molecular mechanisms are not fully understood.
  • Mammalian sterile 20-like 1 kinase (Mst1) is known for its role in apoptosis but also influences homeostatic cell functions.

Purpose of the Study:

  • To investigate the role of Mst1 in regulating CCR7-dependent functions in mDCs.
  • To elucidate the molecular mechanisms by which Mst1 controls CCR7 signaling.

Main Methods:

  • Stimulation of CCR7 in mDCs and assessment of Mst1 activation.
  • Reduction of Mst1 expression using small interfering RNA (siRNA) in mDCs.
  • Analysis of CCR7-dependent effects on mDC cytoarchitecture, endocytosis, migratory speed, chemotaxis, and survival.
  • Biochemical analysis of signaling pathways, including RhoA and its downstream targets.
  • Assessment of actin cytoskeleton dynamics.

Main Results:

  • CCR7 stimulation induces Gαi-dependent activation of Mst1 in mDCs.
  • Reduced Mst1 levels impaired CCR7-dependent effects on cytoarchitecture, endocytosis, and migratory speed, but not chemotaxis or survival.
  • Mst1 regulates CCR7 signaling downstream of Gα13, impacting the RhoA pathway.
  • Mst1 deficiency reduced phosphorylation of RhoA targets (cofilin, myosin light chain, myosin light chain phosphatase) and actin barbed-end formation.

Conclusions:

  • The kinase Mst1 plays a selective role in controlling CCR7-dependent functions in human mDCs.
  • Mst1 is a key mediator of CCR7-induced changes in mDC cytoarchitecture, endocytosis, and migration.
  • Mst1 acts downstream of CCR7 and independently of Gα13, modulating the RhoA pathway and actin cytoskeleton dynamics.

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