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The effect of mGluR2 activation on signal transduction pathways and neuronal cell survival

Hyoung-gon Lee1, Xiongwei Zhu, Gemma Casadesus

  • 1Department of Pathology, Case Western Reserve University, Cleveland, Ohio, USA. Hyoung-gon.lee@case.edu

Brain Research
|November 26, 2008
PubMed

Insights

Metabotropic glutamate receptor 2 (mGluR2) activation promotes neuronal survival in Alzheimer disease (AD) models by activating pro-survival pathways and reducing oxidative stress. This suggests mGluR2 plays a neuroprotective role in AD pathogenesis.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Previous studies identified altered signal transduction pathways, including mitogen-activated protein kinase (MAPK), in Alzheimer disease (AD).
  • mGluR2 was found to be elevated in hippocampal pyramidal neurons in AD, co-localizing with neurofibrillary pathology, suggesting its potential role in selective neuronal degeneration.

Purpose of the Study:

  • To investigate the mechanistic relevance of mGluR2 in neuronal function and survival within the context of AD.
  • To explore the downstream signaling pathways activated by mGluR2 and its impact on cellular processes relevant to AD.

Main Methods:

  • Utilized cell culture models to study the effects of mGluR2 activation.
  • Examined the activation of extracellular signal-related kinase (ERK) pathways following mGluR2 stimulation.
  • Assessed tau phosphorylation levels and the impact of mGluR2 activation on oxidative stress-mediated cytotoxicity.

Main Results:

  • Activation of mGluR2 leads to the activation of the pro-survival ERK pathway.
  • This pro-survival signaling is also ectopically activated in AD, highlighting its in vivo significance.
  • mGluR2 activation increases tau phosphorylation and reduces oxidative stress-induced neuronal cell death.
  • Tau phosphorylation appears to be a neuroprotective antioxidant response.

Conclusions:

  • mGluR2 activation may mediate neuronal survival in AD by engaging pro-survival signaling pathways and mitigating oxidative stress.
  • Tau phosphorylation, induced by mGluR2 activation, could represent a neuroprotective mechanism against cellular insults in AD.

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