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Related Experiment Videos

Mutant alpha-synuclein exacerbates age-related decrease of neurogenesis.

Beate Winner1, Edward Rockenstein, D Chichung Lie

  • 1Department of Neurology, University of Regensburg, Universitaetsstr. 84, 93053 Regensburg, Germany.

Neurobiology of Aging
|February 6, 2007
PubMed
Summary

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Parkinson disease impairs neurogenesis in aged mice. Mutant alpha-synuclein reduced cell proliferation, while both wild-type and mutant forms increased cell death, impacting the subventricular zone and olfactory bulb.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Parkinson disease (PD) is linked to alpha-synuclein accumulation.
  • Alpha-synuclein mutations accelerate PD onset and progression.
  • Neurogenesis is reduced in PD models.

Purpose of the Study:

  • To investigate the impact of wild-type and mutant alpha-synuclein on subventricular zone/olfactory bulb neurogenesis in aged mice.
  • To determine the mechanisms underlying neurogenesis changes in PD models.

Main Methods:

  • Aged mice expressing wild-type or A53T mutant human alpha-synuclein were used.
  • Subventricular zone and olfactory bulb neurogenesis were assessed.
  • Cell proliferation and cell death (TUNEL assay) were quantified.

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Main Results:

  • Both wild-type and mutant alpha-synuclein-expressing mice showed decreased neurogenesis compared to controls.
  • Mutant alpha-synuclein reduced cell proliferation in the subventricular zone.
  • Increased cell death (TUNEL-positive profiles) was observed in the subventricular zone (mutant) and olfactory bulb (both types).

Conclusions:

  • Aging with alpha-synuclein expression impairs neurogenesis.
  • Mutant alpha-synuclein specifically reduces subventricular zone cell proliferation.
  • Olfactory bulb neurogenesis is affected by both wild-type and mutant alpha-synuclein, suggesting a link to olfactory dysfunction in PD.