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Related Experiment Videos

Selective mGluR5 antagonists MPEP and SIB-1893 decrease NMDA or glutamate-mediated neuronal toxicity through actions

D M O'Leary1, V Movsesyan, S Vicini

  • 1Department of Neuroscience, Georgetown University Medical Center, 3900 Reservoir Road NW, Washington DC 20007, USA.

British Journal of Pharmacology
|November 23, 2000
PubMed
Summary

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Metabotropic glutamate receptor 5 (mGluR5) antagonists MPEP and SIB-1893 protect against NMDA-induced neurotoxicity. However, these compounds also block NMDA receptors, suggesting their neuroprotective effects stem from NMDA receptor antagonism, not mGluR5 antagonism.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Metabotropic glutamate receptors (mGluRs) are G-protein coupled receptors involved in neuronal function.
  • Group I mGluRs, including mGluR1 and mGluR5, have been implicated in acute neuronal injury.
  • Pharmacological tools to differentiate the roles of mGluR1 and mGluR5 were previously limited.

Purpose of the Study:

  • To investigate the role of metabotropic glutamate receptor 5 (mGluR5) in NMDA and glutamate-mediated neurodegeneration.
  • To evaluate the neuroprotective effects of mGluR5 antagonists MPEP and SIB-1893 in cultured rat cortical cells.

Main Methods:

  • Utilized cultured rat cortical cells exposed to NMDA and glutamate.
  • Administered mGluR5 antagonists MPEP and SIB-1893 at concentrations of 20 and 200 microM.

Related Experiment Videos

  • Assessed neuroprotection and receptor activity using electrophysiology (whole-cell voltage clamp, outside-out patch) and biochemical assays (phosphoinositol hydrolysis).

    • Main Results:

    • MPEP and SIB-1893 demonstrated significant neuroprotection against NMDA and glutamate toxicity at tested concentrations.
    • SIB-1893 confirmed mGluR5 antagonism by inhibiting phosphoinositol hydrolysis induced by the mGluR5 agonist CHPG.
    • Both MPEP and SIB-1893 non-competitively inhibited NMDA-evoked currents and reduced NMDA channel opening duration.

    Conclusions:

    • The neuroprotective effects of MPEP and SIB-1893 are primarily attributed to their noncompetitive NMDA receptor antagonist activity.
    • Caution is advised when interpreting the role of mGluR5 in neuroprotection based solely on studies using these compounds.
    • Further research is needed to elucidate the specific contributions of mGluR5 in neurodegenerative processes.