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Reversal of Global Ischemia-Induced Cognitive Dysfunction by Delayed Inhibition of TRPM2 Ion Channels

Robert M Dietz1,2, Ivelisse Cruz-Torres2,3, James E Orfila2,4

  • 1Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, USA.

Translational Stroke Research
|June 29, 2019
PubMed

Insights

Targeting TRPM2 channels may reverse cognitive deficits after cardiac arrest. Inhibiting TRPM2 channels later in the recovery phase improved synaptic plasticity and memory, offering a potential new treatment strategy.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Pharmacology

Background:

  • Hippocampal injury and cognitive impairments are significant challenges following cardiac arrest and stroke.
  • Current interventions for these neurological deficits remain largely ineffective.
  • Synaptic dysfunction plays a critical role in post-ischemic cognitive decline.

Purpose of the Study:

  • To investigate the role of the transient receptor potential-M2 (TRPM2) channel in ischemia-induced synaptic dysfunction.
  • To explore the potential of targeting TRPM2 channels for therapeutic intervention.
  • To develop a novel approach for reversing synaptic dysfunction and cognitive impairments.

Main Methods:

  • Utilized a mouse model of cardiac arrest/cardiopulmonary resuscitation (CA/CPR).
  • Examined the effects of TRPM2 channel absence (TRPM2-/-) and pharmacological inhibition (tatM2NX).
  • Assessed hippocampal cell death, synaptic plasticity, and memory deficits.

Main Results:

  • Absence or acute inhibition of TRPM2 channels reduced hippocampal cell death in males and prevented synaptic plasticity deficits in both sexes.
  • Chronic administration of tatM2NX weeks after injury reversed hippocampal plasticity and memory deficits.
  • TRPM2 channel activity was linked to the calcineurin-GSK3β pathway, contributing to synaptic plasticity impairments.

Conclusions:

  • Persistent TRPM2 channel activity post-ischemia contributes to hippocampal network dysfunction.
  • Inhibition of TRPM2 channels at chronic time points offers a novel therapeutic strategy for improving functional recovery after cerebral ischemia.
  • This approach may improve cognitive function independently of neuroprotection.
Keywords:
Cardiac arrestCognitive impairmentLTPNeurorestorationStrokeSynaptic plasticity

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