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Related Experiment Videos

Cell damage by excess CuZnSOD and Down's syndrome

Y Groner1, O Elroy-Stein, K B Avraham

  • 1Department of Molecular Genetics and Virology, Weizmann Institute of Science, Rehovot, Israel.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|January 1, 1994
PubMed
Summary

Overexpression of the CuZn-superoxide dismutase (CuZnSOD) gene in Down's Syndrome may cause neurobiological abnormalities. Studies in cell and animal models show elevated CuZnSOD impacts neurotransmitter transport and neuromuscular junctions.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Down's Syndrome (DS) is linked to trisomy 21, potentially caused by gene overexpression on chromosome 21.
  • Elevated CuZn-superoxide dismutase (CuZnSOD) activity is observed in DS patients.
  • CuZnSOD gene mutations are implicated in familial ALS, highlighting its role in neuronal disorders.

Purpose of the Study:

  • To investigate the role of CuZnSOD gene dosage in the etiology of Down's Syndrome.
  • To explore the physiological consequences of CuZnSOD gene overexpression using cellular and animal models.

Main Methods:

  • Developed cellular models (PC12 cells) with elevated human CuZnSOD expression.
  • Generated transgenic mice carrying the human CuZnSOD gene.
  • Analyzed neurotransmitter uptake in cell models and neuromuscular junctions (NMJ) in mice.

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Main Results:

  • PC12 cells with increased CuZnSOD showed impaired neurotransmitter uptake, specifically affecting chromaffin granule transport.
  • Transgenic mice exhibited 1.6 to 6.0-fold increased CuZnSOD activity in the brain.
  • Transgenic mice displayed pathological changes in tongue NMJ, including axon degeneration and altered terminal morphology, mirroring changes seen in DS patients.

Conclusions:

  • Elevated CuZnSOD activity interferes with biogenic amine transport, potentially contributing to neurobiological deficits in Down's Syndrome.
  • CuZnSOD gene dosage is implicated in the pathological abnormalities of tongue neuromuscular junctions observed in Down's Syndrome.