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Physiology of Microglia.

Olga Garaschuk1, Alexei Verkhratsky2,3,4

  • 1Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany. olga.garaschuk@uni-tuebingen.de.

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Microglia, the central nervous system's immune cells, originate from fetal macrophages. Their unique physiology allows them to monitor the brain environment for pathogens and damage.

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ChemokinesCytokinesDamage-associated molecular patterns (DAMPs)Ion channelsMicrogliaNeurotransmitter receptorsPathogen-associated molecular patterns (PAMPs)Toll-like receptors (TLR)

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglial cells are the primary immune cells of the central nervous system (CNS).
  • They originate from fetal macrophages that migrate to the CNS during early development.
  • In their resting state, microglia exhibit a distinct morphology with a small cell body and highly ramified, motile processes.

Purpose of the Study:

  • To describe the developmental origin and physiological characteristics of microglial cells.
  • To highlight the adaptive changes that enable microglia to function within the unique CNS environment.

Main Methods:

  • Developmental origin traced from fetal macrophages.
  • Morphological characterization of resting/surveillant microglia.
  • Analysis of physiological properties, including cellular excitability and receptor expression.

Main Results:

  • Microglia are derived from embryonic macrophages that colonize the CNS.
  • Resting microglia display a surveillant phenotype with ramified, motile processes.
  • Their physiology includes excitability, low membrane conductance, and expression of receptors for PAMPs, DAMPs, neurotransmitters, and neurohormones.

Conclusions:

  • Microglial cells are uniquely adapted myeloid cells within the CNS.
  • Their specific physiological profile supports their role in immune surveillance and response within the brain.