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Experimental hyperphenylalaninemia provokes oxidative stress in rat brain
Martine E Kienzle Hagen1, Carolina D Pederzolli, Angela M Sgaravatti
1Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600 (Anexo) 90035-003, Porto Alegre, RS, Brazil.
Biochimica Et Biophysica Acta
|May 9, 2002
Summary
Phenylketonuria (PKU) causes L-phenylalanine buildup, leading to brain damage. This study shows hyperphenylalaninemia induces oxidative stress in rat brains, suggesting a potential therapeutic target.
Area of Science:
- Biochemistry
- Neuroscience
- Metabolic Disorders
Background:
- Phenylketonuria (PKU) is an inherited metabolic disorder.
- Characterized by L-phenylalanine (Phe) accumulation.
- Neuropathology mechanisms in PKU remain unclear.
Purpose of the Study:
- Investigate oxidative stress parameters in the brain.
- Examine the role of hyperphenylalaninemia in brain damage.
- Assess the impact of Phe on antioxidant enzymes.
Main Methods:
- Experimental hyperphenylalaninemia induced in rats.
- Measurement of brain chemiluminescence and antioxidant potential (TRAP).
- Assay of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) activities.
Main Results:
- Increased brain chemiluminescence and reduced TRAP in hyperphenylalaninemic rats.
- Inhibition of CAT activity by Phe (in vitro and in vivo).
- Reduced GSH-Px activity in vivo; unaltered SOD activity.
Conclusions:
- Oxidative stress is implicated in PKU neuropathology.
- Phe affects key antioxidant enzymes.
- Further research is needed to confirm findings in humans and explore antioxidant therapies.