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Related Experiment Videos

Hypothalamic digoxin-mediated model for trisomy 21.

Ravi Kumar Kurup1, Parameswara Achutha Kurup

  • 1Department of Neurology, Medical College, Trivandrum, Kerala, India.

Pediatric Pathology & Molecular Medicine
|December 25, 2003
PubMed
Summary
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Trisomy 21 disrupts the isoprenoid pathway, altering key enzyme activities and metabolite levels. This biochemical imbalance, including changes in neurotransmitters and glycoproteins, contributes to the pathogenesis of Down syndrome.

Area of Science:

  • Biochemistry
  • Genetics
  • Metabolomics

Background:

  • Trisomy 21 (Down syndrome) is associated with various biochemical alterations.
  • The isoprenoid pathway plays a crucial role in cellular metabolism and function.

Purpose of the Study:

  • To investigate the isoprenoid pathway cascade in individuals with trisomy 21.
  • To identify specific metabolic changes associated with trisomy 21.

Main Methods:

  • Assessed membrane Na+, K(+)-ATPase activity.
  • Measured serum magnesium, ubiquinone, hydroxy methyl glutaryl CoA (HMG) reductase activity, serum digoxin, and dolichol levels.
  • Analyzed tryptophan and tyrosine catabolites, glycoprotein and glycolipid components, glycosaminoglycans (GAGs), lysosomal enzymes, glutathione, and oxidative stress markers.

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Main Results:

  • Decreased Na+, K(+)-ATPase activity, serum magnesium, and ubiquinone.
  • Increased HMG-CoA reductase activity, serum digoxin, and dolichol levels.
  • Altered tryptophan and tyrosine catabolites, increased dolichol, glycoprotein/glycolipid carbohydrate residues, GAGs, lysosomal enzymes, and nitric oxide, alongside reduced glutathione and antioxidant enzymes.

Conclusions:

  • A disordered isoprenoid pathway is implicated in the pathogenesis of trisomy 21.
  • Hypothalamic digoxin and widespread metabolic dysregulation contribute to trisomy 21.