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Related Experiment Videos

GABA B receptor subunit expression in glia.

K J Charles1, J Deuchars, C H Davies

  • 1Neurology and Gastroenterology Centre of Excellence for Drug Discovery, GlaxoSmithKline, New Frontiers Science Park, Third Avenue, Harlow, Essex, UK. Charlekl@wyeth.com

Molecular and Cellular Neurosciences
|October 11, 2003
PubMed
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This study reveals that key subunits of GABA(B) receptors are present on nonneuronal cells like astrocytes and microglia in the rat central nervous system (CNS). This finding expands our understanding of GABA(B) receptor distribution beyond neurons.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • GABA(B) receptors are crucial for inhibitory neurotransmission in the CNS, primarily located on neurons.
  • Previous studies suggested functional GABA(B) receptors on nonneuronal cells, but their molecular components remained unknown.

Purpose of the Study:

  • To investigate the expression and localization of GABA(B) receptor subunits on nonneuronal cells in the rat CNS.
  • To determine the molecular composition of GABA(B) receptors in nonneuronal cell types.

Main Methods:

  • Immunohistochemistry was employed to detect GABA(B) receptor subunits (GABA(B1a), GABA(B1b), GABA(B2)) in cultured and in situ nonneuronal cells.
  • Ultrastructural analysis was used to examine receptor localization at synapses.

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Main Results:

  • All three principal GABA(B) receptor subunits were detected on nonneuronal cells in both cultured and tissue samples.
  • GABA(B) receptor subunits were found on astrocytic processes surrounding synapses in the hippocampus.
  • These subunits were also expressed on activated microglia but not on oligodendrocytes.

Conclusions:

  • This study provides the first evidence for the expression of obligate GABA(B) receptor subunits in astrocytes and microglia within the rat CNS.
  • The findings suggest a potential role for GABA(B) signaling in nonneuronal cells, impacting CNS function.