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Related Experiment Videos

Free radical scavenging systems in developing rat brain.

B R Shivakumar1, H K Anandatheerthavarada, V Ravindranath

  • 1Department of Neurochemistry, National Institute of Mental Health and Neuro Sciences, Bangalore, India.

International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience
|January 1, 1991
PubMed
Summary

Developing rat brains have robust antioxidant defenses, with enzyme levels comparable to adults. Lipid peroxidation increases post-birth, indicating developing protection against oxidative stress.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Developmental Biology

Background:

  • The developing brain's vulnerability to high oxygen tension necessitates effective antioxidant protection.
  • Understanding antioxidant enzyme development is crucial for brain maturation.

Purpose of the Study:

  • To quantify antioxidant enzyme levels (superoxide dismutase, catalase, glutathione) in the developing rat brain.
  • To assess lipid peroxidation as an indicator of oxidative stress during brain development.

Main Methods:

  • Measurement of superoxide dismutase (total, copper-zinc, manganese), catalase, glutathione, glutathione reductase, and glutathione peroxidase activities.
  • Quantification of thiobarbituric acid reactive products to assess lipid peroxidation.

Main Results:

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  • Antioxidant enzyme levels in the developing brain are largely comparable to adult levels.
  • Lipid peroxidation products increase significantly from birth to day 16.
  • Specific enzymes like copper-zinc superoxide dismutase show developmental increases, reaching adult levels by day 10.

Conclusions:

  • The developing rat brain possesses significant antioxidant capacity.
  • Hepatic antioxidant enzyme levels are lower at birth and increase with development, unlike the brain.