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Mutant Huntingtin Causes a Selective Decrease in the Expression of Synaptic Vesicle Protein 2C.

Chaohua Peng1, Gaochun Zhu1, Xiangqian Liu2

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|May 2, 2018
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Summary
This summary is machine-generated.

Huntington's disease (HD) involves mutant huntingtin (Htt) protein disrupting synaptic function. This study shows mutant Htt selectively reduces synaptic vesicle protein 2C (SV2C) expression, contributing to HD pathology.

Keywords:
Basal gangliaHippocampusHuntington’s diseaseSynaptic vesicle protein 2C

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder linked to polyglutamine expansion in the huntingtin (Htt) protein.
  • Mutant Htt impairs synaptic transmission by altering synaptic protein expression, leading to early HD symptoms.
  • Synaptic vesicle proteins 2 (SV2s), including SV2A, SV2B, and SV2C, are crucial for synaptic physiology.

Purpose of the Study:

  • To investigate the effect of mutant Htt on SV2 family member expression in HD models.
  • To determine if mutant Htt selectively affects the expression of SV2A, SV2B, or SV2C.
  • To elucidate the role of SV2C dysregulation in the pathogenesis of Huntington's disease.

Main Methods:

  • Western blot analysis to assess protein levels of SV2A, SV2B, and SV2C in HD transgenic mouse brains and Neuro2a cells.
  • Immunostaining to evaluate SV2C immunoreactivity in vulnerable brain regions of HD mice.
  • RT-PCR to analyze mRNA levels of SV2A, SV2B, and SV2C in HD mouse brains.

Main Results:

  • Protein levels of SV2A and SV2B remained unchanged in HD mouse brains.
  • A significant decrease in SV2C protein levels was observed in HD mouse brains, particularly in the basal ganglia and hippocampus.
  • SV2C mRNA levels progressively declined in HD mouse brains, indicating selective transcriptional inhibition by mutant Htt.
  • SV2C expression was also inhibited in Neuro2a cells expressing mutant Htt.

Conclusions:

  • Mutant huntingtin selectively inhibits the transcriptional expression of SV2C.
  • The reduction and restricted distribution of SV2C contribute to the region-specific pathology observed in Huntington's disease.
  • Targeting SV2C may offer a therapeutic strategy for Huntington's disease.