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Analyzing the Size, Shape, and Directionality of Networks of Coupled Astrocytes
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Astrocytes are GABAergic cells that modulate microglial activity.

Moonhee Lee1, Claudia Schwab, Patrick L McGeer

  • 1Kinsmen Laboratory of Neurological Research, University of British Columbia, Vancouver, BC, Canada.

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|November 4, 2010
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Gamma-aminobutyric acid (GABA) has a broader central nervous system role beyond inhibition. Human astrocytes are GABAergic, and microglia are GABAceptive, with GABA suppressing their inflammatory responses.

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Area of Science:

  • Neuroscience
  • Neuroimmunology
  • Cell Biology

Background:

  • Gamma-aminobutyric acid (GABA) is traditionally recognized solely as an inhibitory neurotransmitter in the brain.
  • Emerging evidence suggests a more diverse role for GABA within the central nervous system (CNS).
  • The specific roles of GABA in non-neuronal cells like astrocytes and microglia remain incompletely understood.

Purpose of the Study:

  • To investigate the presence and function of GABAergic components in human astrocytes and microglia.
  • To determine the effect of GABA on the inflammatory response of astrocytes and microglia.
  • To explore the therapeutic potential of GABAergic signaling in neuroinflammation.

Main Methods:

  • Immunohistochemical analysis of adult human brain tissue for GABA-related enzymes and receptors in astrocytes.
  • Gene and protein expression analysis of GABAergic components in cultured human astrocytes and microglia.
  • Assessment of GABA's effect on inflammatory pathways (NFκB, P38 MAP kinase) and cytokine release (TNFα, IL-6) in response to LPS and interferon-γ.
  • Pharmacological evaluation using GABA receptor agonists (muscimol, baclofen).

Main Results:

  • Human astrocytes express key GABA-synthesizing (GAD 67), metabolizing (GABA-T), and receptor (GABA(A), GABA(B)) components, comparable to inhibitory neurons.
  • Human microglia express GABA-T and GABA receptors, identifying them as GABAceptive.
  • GABA significantly suppresses astrocyte and microglia reactivity to inflammatory stimuli by inhibiting NFκB and P38 MAP kinase pathways, reducing TNFα and IL-6 release.
  • GABA receptor agonists partially mimic these anti-inflammatory effects.

Conclusions:

  • Human astrocytes are GABAergic, and human microglia are GABAceptive, demonstrating a novel role for GABA in glial cells.
  • GABA exerts significant anti-inflammatory effects on astrocytes and microglia by modulating key signaling pathways.
  • Targeting GABAergic pathways presents a promising therapeutic strategy for neuroinflammatory conditions, potentially enhancing existing anti-inflammatory treatments.