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Decrease in striatal enkephalin mRNA in mouse models of Huntington's disease.

L Menalled1, H Zanjani, L MacKenzie

  • 1Department of Neurology and Mental Retardation Center, University of California at Los Angeles School of Medicine, Los Angeles, California 90095, USA.

Experimental Neurology
|March 31, 2000
PubMed
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Huntington's disease models show reduced enkephalin mRNA in neurons. This suggests decreased enkephalin mRNA expression may signal early neuronal dysfunction in Huntington's disease.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder caused by expanded CAG repeats in the huntingtin gene.
  • Neuronal loss in the striatum is a key pathological feature of HD.

Purpose of the Study:

  • To investigate early molecular changes in mouse models of Huntington's disease.
  • To examine the expression of neurotransmitters and their mRNAs in the striatum of HD mouse models.

Main Methods:

  • Utilized immunohistochemistry and quantitative in situ hybridization histochemistry.
  • Analyzed transgenic and knock-in mouse models with varying CAG repeat expansions.
  • Assessed expression of enkephalin, substance P, and glutamic acid decarboxylase (GAD) mRNAs.

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Main Results:

  • No significant DNA damage was detected in the striatum or cortex of HD mouse models.
  • Immunolabeling for various neuronal antigens was similar across transgenic, knock-in, and wild-type mice.
  • Both transgenic and knock-in HD models exhibited a marked decrease in enkephalin mRNA expression.

Conclusions:

  • Decreased enkephalin mRNA expression may serve as an early indicator of neuronal dysfunction in Huntington's disease.
  • This finding provides insights into the molecular pathology preceding significant neuronal loss.