The effect of mGlu5 receptor positive allosteric modulators on signaling molecules in brain slices

Eur J Pharmacol. 2006 May 1;536(3):262-8. doi: 10.1016/j.ejphar.2006.02.003. Epub 2006 Apr 5.

Abstract

Positive allosteric modulators of metabotropic glutamate receptor subtype 5 (mGlu5) have promising therapeutic potential. The effects of selective mGlu5 receptor positive allosteric modulators on signaling molecules in brain slices have not been previously reported. The current study demonstrated that the selective mGlu5 receptor positive allosteric modulator, N-{4-chloro-2-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2yl)-methyl]phenyl}-2-hydrobenzamide (CPPHA) potentiated the response to a subthreshold concentration of 3,5-dihydroxy-phenylglycine (DHPG) on extracellular signal-regulated protein kinase (ERK) and cyclic-AMP responsive element-binding protein (CREB) activity, as well as N-methyl d-aspartate (NMDA) receptor subunit NR1 phosphorylation in cortical and hippocampal slices. These results suggest that allosteric modulators of mGlu5 receptor could have physiologically significant effects by potentiating the actions of glutamate.

MeSH terms

  • Action Potentials / drug effects
  • Action Potentials / physiology
  • Animals
  • Benzamides / pharmacology*
  • Brain / cytology
  • Brain / drug effects*
  • Brain / metabolism
  • Cells, Cultured
  • Cyclic AMP Response Element-Binding Protein / metabolism
  • Dose-Response Relationship, Drug
  • Drug Synergism
  • Excitatory Amino Acid Antagonists / pharmacology
  • Extracellular Signal-Regulated MAP Kinases / metabolism
  • Glycine / analogs & derivatives*
  • Glycine / pharmacology
  • Hippocampus / cytology
  • Hippocampus / drug effects
  • Hippocampus / metabolism
  • In Vitro Techniques
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Phosphorylation / drug effects
  • Phthalimides / pharmacology*
  • Pyramidal Cells / drug effects
  • Pyramidal Cells / physiology
  • Rabbits
  • Receptor, Metabotropic Glutamate 5
  • Receptors, Metabotropic Glutamate / antagonists & inhibitors*
  • Receptors, N-Methyl-D-Aspartate / metabolism
  • Resorcinols / pharmacology*
  • Signal Transduction / physiology

Substances

  • Benzamides
  • Cyclic AMP Response Element-Binding Protein
  • Excitatory Amino Acid Antagonists
  • N-(4-chloro-2-((1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)methyl)phenyl)-2-hydroxybenzamide
  • NR1 NMDA receptor
  • Phthalimides
  • Receptor, Metabotropic Glutamate 5
  • Receptors, Metabotropic Glutamate
  • Receptors, N-Methyl-D-Aspartate
  • Resorcinols
  • 3,5-dihydroxyphenylglycine
  • Extracellular Signal-Regulated MAP Kinases
  • Glycine