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Related Experiment Videos

Hyperammonemia in lysinuric protein intolerance.

T Kato, N Mizutani, M Ban

    Pediatrics
    |April 1, 1984
    PubMed
    Summary

    Lysinuric protein intolerance involves hyperammonemia due to low arginine and ornithine levels. Even small amounts of absorbed arginine can normalize ammonia metabolism in affected individuals.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Metabolic Disorders

    Background:

    • Lysinuric protein intolerance (LPI) is a rare genetic disorder characterized by hyperdibasicaminoaciduria and postprandial hyperammonemia.
    • Urea cycle disorders impair the body's ability to eliminate ammonia, leading to toxic buildup.

    Observation:

    • Two brothers with LPI exhibited hyperammonemia after an intravenous alanine load.
    • Two patients with cystinuria also developed hyperammonemia following an alanine load after fasting.
    • Both LPI and cystinuria patients displayed reduced plasma arginine and ornithine levels.

    Findings:

    • Arginine supplementation normalized hyperammonemia in one LPI patient, suggesting absorbed arginine's crucial role.
    • Hyperammonemia in these cases is linked to decreased plasma levels of urea cycle substrates like arginine and ornithine.
    • Impaired ammonia metabolism in LPI is attributed to low plasma arginine and ornithine, disrupting urea cycle function.

    Implications:

    • This study highlights the critical role of arginine and ornithine in ammonia detoxification.
    • Understanding these metabolic pathways can inform therapeutic strategies for urea cycle disorders.
    • Early diagnosis and management of LPI and related conditions are essential to prevent neurological complications.

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