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Neuroprotective strategies for NMDAR-mediated excitotoxicity in Huntington’s Disease

  • Review
  • Published:
Frontiers in Biology

Abstract

BACKGROUND

Huntington’s Disease (HD) is an autosomal dominant neurodegenerative disease causing severe neurodegeneration of the striatum as well as marked cognitive and motor disabilities. Excitotoxicity, caused by overstimulation of NMDA receptors (NMDARs) has been shown to have a key role in the neuropathogenesis of HD, suggesting that targeting NMDAR-dependent signaling may be an effective clinical approach for HD. However, broad NMDAR antagonists are generally poor therapeutics in clinical practice. It has been suggested that GluN2A-containing, synaptically located NMDARs activate cell survival signaling pathways, while GluN2B-containing, primarily extrasynaptic NMDARs trigger cell death signaling. A better approach to development of effective therapeutics for HD may be to target, specifically, the cell-death specific pathways associated with extrasynaptic GluN2B NMDAR activation, while maintaining or potentiating the cellsurvival activity of GluN2A-NMDARs.

OBJECTIVE

This review outlines the role of NMDAR-mediated excitotoxicity in HD and overviews current efforts to develop better therapeutics for HD where NMDAR excitotoxicity is the target.

METHODS

A systematic review process was conducted using the PubMed search engine focusing on research conducted in the past 5-10 years. 235 articles were consulted for the review, with key search terms including “Huntington’s Disease,” “excitotoxicity,” “NMDAR” and “therapeutics.”

RESULTS

A wide range of NMDAR excitotoxicity-based targets for HD were identified and reviewed, including targeting NMDARs directly by blocking GluN2B, extrasynaptic NMDARs and/or potentiating GluN2A, synaptic NMDARs, targeting glutamate release or uptake, or targeting specific downstream cell-death signaling of NMDARs.

CONCLUSION

The current review identifies NMDAR-mediated excitotoxicity as a key player in HD pathogenesis and points to various excitotoxicity-focused targets as potential future preventative therapeutics for HD.

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  1. Djavad Mowafahian Centre for Brain Health & Department of Medicine, University of British Columbia, Vancouver, V6T 1Z3, Canada

    Kimberly D. Girling & Yu Tian Wang

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Girling, K.D., Wang, Y.T. Neuroprotective strategies for NMDAR-mediated excitotoxicity in Huntington’s Disease. Front. Biol. 11, 439–458 (2016). https://doi.org/10.1007/s11515-016-1425-z

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