Downregulation of cannabinoid receptor 1 from neuropeptide Y interneurons in the basal ganglia of patients with Huntington's disease and mouse models

Eric A. Horne, Jonathan Coy, Katie Swinney, Susan Fung, Allison E. T. Cherry, William R. Marrs, Alipi V. Naydenov, Yi Hsing Lin, Xiaocui Sun, C. Dirk Keene, Eric Grouzmann, Paul Muchowski, Gillian P. Bates, Ken Mackie, Nephi Stella*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Cannabinoid receptor 1 (CB1 receptor) controls several neuronal functions, including neurotransmitter release, synaptic plasticity, gene expression and neuronal viability. Downregulation of CB1 expression in the basal ganglia of patients with Huntington's disease (HD) and animal models represents one of the earliest molecular events induced by mutant huntingtin (mHtt). This early disruption of neuronal CB1 signaling is thought to contribute to HD symptoms and neurodegeneration. Here we determined whether CB1 downregulation measured in patients with HD and mouse models was ubiquitous or restricted to specific striatal neuronal subpopulations. Using unbiased semi-quantitative immunohistochemistry, we confirmed previous studies showing that CB1 expression is downregulated in medium spiny neurons of the indirect pathway, and found that CB1 is also downregulated in neuropeptide Y (NPY)/neuronal nitric oxide synthase (nNOS)-expressing interneurons while remaining unchanged in parvalbumin- and calretinin-expressing interneurons. CB1 downregulation in striatal NPY/nNOS-expressing interneurons occurs in R6/2 mice, HdhQ150/Q150 mice and the caudate nucleus of patients with HD. In R6/2 mice, CB1 downregulation in NPY/nNOS-expressing interneurons correlates with diffuse expression of mHtt in the soma. This downregulation also occludes the ability of cannabinoid agonists to activate the pro-survival signaling molecule cAMP response element-binding protein in NPY/nNOS-expressing interneurons. Loss of CB1 signaling in NPY/nNOS-expressing interneurons could contribute to the impairment of basal ganglia functions linked to HD.

Original languageEnglish
Article numberN/A
Pages (from-to)429-440
Number of pages12
JournalEuropean Journal of Neuroscience
Volume37
Issue number3
DOIs
Publication statusPublished - Feb 2013

Keywords

  • CB 1
  • CREB
  • neurodegeneration
  • NPY
  • R6
  • 2
  • STRIATAL GABAERGIC INTERNEURONS
  • MEDIUM SPINY NEURONS
  • MUTANT HUNTINGTIN
  • AXONAL-TRANSPORT
  • TRANSGENIC MICE
  • CB1 RECEPTOR
  • MESSENGER-RNA
  • IN-VIVO
  • EXPRESSION
  • DOPAMINE

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