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Clearance by Microglia Depends on Packaging of Phagosomes into a Unique Cellular Compartment

Ambra Villani1, Jørgen Benjaminsen1, Christian Moritz2

  • 1European Molecular Biology Laboratory (EMBL), Developmental Biology Unit, Heidelberg, Germany; Collaboration for joint PhD degree between EMBL and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany.

Developmental Cell
|March 19, 2019
PubMed

Insights

Microglia efficiently process ingested materials within a specialized compartment called the gastrosome. Disruption of this process impairs microglial immune cell function and migration.

Area of Science:

  • Cell biology
  • Immunology
  • Neuroscience

Background:

  • Phagocytic immune cells like microglia are vital for pathogen clearance and tissue homeostasis.
  • Efficient intracellular processing of engulfed material is critical for microglial function.
  • The precise mechanisms governing phagosome processing remain poorly understood.

Purpose of the Study:

  • To elucidate the cellular mechanisms underlying phagosome processing in immune cells.
  • To identify key molecular players and cellular compartments involved in phagosome maturation.
  • To investigate the functional consequences of impaired phagosome processing on microglial behavior.

Main Methods:

  • Utilized live fish embryos and mammalian macrophages as model systems.
  • Employed advanced imaging techniques to observe cellular processes in real-time.
  • Investigated the role of the transporter Slc37a2 using genetic manipulation.

Main Results:

  • Discovered a conserved cellular compartment, the gastrosome, essential for phagosome shrinkage and packaging.
  • Demonstrated that the transporter Slc37a2 is crucial for phagosome shrinkage within the gastrosome.
  • Showed that loss of Slc37a2 leads to gastrosome expansion, cellular bloating, and impaired microglial phagocytosis and migration.

Conclusions:

  • Identified a conserved, critical step in the phagocytic pathway involving gastrosome formation and function.
  • Slc37a2-mediated phagosome shrinkage is essential for maintaining microglial integrity and function.
  • This pathway offers a potential target for modulating immune cell behavior in development and disease.
Keywords:
apoptotic cell clearancebrain developmentefferocytosismacrophagemicroglianeuronal cell deathneuronal immunityphagocytosisslc37a2zebrafish

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