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N-Acetylaspartate and DARPP-32 levels decrease in the corpus striatum of Huntington's disease mice.

A van Dellen1, J Welch, R M Dixon

  • 1University Laboratory of Physiology, University of Oxford.

Neuroreport
|December 16, 2000
PubMed
Summary

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Huntington's disease (HD) involves neurodegeneration, with reduced N-acetylaspartate (NAA) and DARPP-32 markers observed in affected mice, indicating neuronal dysfunction.

Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Huntington's disease (HD) is an inherited neurodegenerative disorder.
  • It primarily affects the corpus striatum and cerebral cortex.
  • The R6/1 transgenic mouse model expresses human huntingtin with an expanded CAG repeat.

Purpose of the Study:

  • To assess neuronal markers in the R6/1 mouse model of HD using in vivo magnetic resonance spectroscopy (MRS).
  • To investigate changes in N-acetylaspartate (NAA) and DARPP-32 expression in HD mice.

Main Methods:

  • In vivo magnetic resonance spectroscopy (MRS) was employed to measure NAA levels.
  • Immunohistochemistry was used to assess DARPP-32 and calbindin expression.
  • Comparisons were made between R6/1 transgenic mice and wild-type littermates.

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Main Results:

  • N-acetylaspartate (NAA) levels were significantly reduced by 26% in the corpus striatum of HD mice at 5 months.
  • DARPP-32 expression was downregulated in the striatum of HD mice by 5 and 11 months of age.
  • Cholines, creatine-phosphocreatine, and calbindin levels remained largely unchanged.

Conclusions:

  • Decreased NAA and DARPP-32 suggest neuronal dysfunction in Huntington's disease.
  • These molecular changes may contribute to aberrant receptor signaling in HD.
  • The findings highlight potential biomarkers for HD progression.