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mGlu5 receptor antagonist decreases Fos expression in spinal neurons after noxious visceral stimulation

Rossella Bianchi1, Rita Rezzani, Elisa Borsani

  • 1Department of Biomedical Sciences and Biotechnology, University of Brescia, Via Valsabbina 19, 25124, Brescia, Italy. bianchi@med.unibs.it

Brain Research
|December 31, 2002
PubMed

Insights

The study investigated the role of the mGlu5 receptor in visceral pain. Blocking this receptor with MPEP reduced Fos expression in the spinal cord, indicating its involvement in pain signaling.

Area of Science:

  • Neuroscience
  • Pain Research
  • Pharmacology

Background:

  • Visceral pain involves complex signaling pathways in the spinal cord.
  • Glutamate metabotropic subtype 5 (mGlu5) receptors are implicated in neuronal excitability and synaptic plasticity.
  • Understanding the role of specific receptors in visceral pain transmission is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the effect of the mGlu5 receptor antagonist MPEP on Fos expression in the rat spinal cord during visceral pain.
  • To determine the involvement of mGlu5 receptors in the spinal processing of visceral pain signals.

Main Methods:

  • Utilized a rat model of visceral pain.
  • Administered the mGlu5 receptor antagonist MPEP.
  • Quantified Fos expression, a marker of neuronal activation, in the thoracic and lumbar spinal cord dorsal horn.

Main Results:

  • Noxious visceral stimulation significantly increased Fos-positive neurons in the spinal cord dorsal horn.
  • Pretreatment with MPEP markedly reduced the number of Fos-positive neurons in these spinal cord regions.
  • MPEP administration attenuated the neuronal activation induced by noxious visceral stimuli.

Conclusions:

  • The mGlu5 receptor plays a significant role in the spinal cord's processing of visceral pain.
  • Inhibition of mGlu5 receptors can modulate neuronal activity associated with visceral pain transmission.
  • Targeting mGlu5 receptors represents a potential therapeutic strategy for managing visceral pain.

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