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G protein-coupled receptor 84, a microglia-associated protein expressed in neuroinflammatory conditions

Caroline Bouchard1, Julie Pagé, Andréanne Bédard

  • 1Department of Oncology and Molecular Endocrinology, Laval University Hospital Research Center, Québec City, Québec, Canada G1V 4G2.

Glia
|March 29, 2007
PubMed

Insights

G protein-coupled receptor 84 (GPR84) is a novel marker for activated microglia during neuroinflammation. Its expression is induced by endotoxemia and cytokines like TNF and IL-1, suggesting a role in neuroimmune responses.

Area of Science:

  • Neuroimmunology
  • Cellular and Molecular Neuroscience
  • Receptor Biology

Background:

  • G protein-coupled receptor 84 (GPR84) is a recently identified seven transmembrane receptor.
  • Its physiological function and regulatory mechanisms remain largely unknown.
  • Microglia are key immune cells in the central nervous system.

Purpose of the Study:

  • To investigate the expression and regulation of GPR84 in microglia and other immune cells.
  • To identify GPR84 as a potential marker for microglial activation.
  • To explore the role of GPR84 in neuroinflammatory conditions.

Main Methods:

  • Induction of endotoxemia in mice.
  • Analysis of GPR84 expression in microglia, macrophages, and monocytes.
  • Utilizing knockout mice for tumor necrosis factor (TNF) and interleukin-1 (IL-1).
  • Intracerebral injection of TNF and in vitro microglial cultures.
  • Assessment of GPR84 expression during experimental autoimmune encephalomyelitis (EAE).

Main Results:

  • GPR84 is strongly and persistently expressed by microglia during endotoxemia in mice.
  • Expression is also observed in peripheral macrophages and monocytes.
  • Endotoxin-induced GPR84 expression is partly mediated by TNF and IL-1.
  • Recombinant TNF directly stimulates GPR84 expression in microglia.
  • GPR84 is expressed by microglia in EAE, a model of multiple sclerosis.

Conclusions:

  • GPR84 is identified as a sensitive marker for microglial activation.
  • Its expression is regulated by proinflammatory mediators like TNF and IL-1.
  • GPR84 may play a significant role in neuroimmunological processes.

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