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Megavitamin responsive aminoacidopathies

R E Hillman

    Pediatric Clinics of North America
    |August 1, 1976
    PubMed
    Summary

    Vitamin cofactors, like B vitamins, are crucial for enzyme function. Therapeutic trials with high cofactor doses are necessary to determine patient response in treating metabolic disorders.

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    Area of Science:

    • Biochemistry
    • Nutritional Science
    • Metabolic Disorders

    Background:

    • Vitamins, particularly B complex members, function as essential coenzymes, activating apoenzymes into active holoenzymes.
    • These cofactors play diverse roles in biochemical reactions.
    • Predicting in vivo patient response to specific cofactor therapy after enzyme diagnosis remains challenging.

    Purpose of the Study:

    • To evaluate the necessity and approach for therapeutic trials of vitamin cofactors in patients with diagnosed enzyme deficiencies.
    • To highlight the challenges in predicting patient response to cofactor therapy.
    • To advocate for the use of cofactor supplementation in treating inborn errors of metabolism.

    Main Methods:

    • Administration of high-dose vitamin cofactors (several hundred to several thousand times normal daily requirements) via parenteral or oral routes.
    • Conducting therapeutic trials in patients with specific enzyme disorders, including B6-responsive disorders and maple syrup urine disease.
    • Observing patient response to cofactor therapy over extended periods, even in the absence of short-term effects.

    Main Results:

    • High cofactor doses are required for therapeutic efficacy.
    • Long-term trials are indicated, as short-term responses may not be apparent.
    • Successful cofactor therapy can significantly simplify treatment for patients with inborn errors of amino acid metabolism.

    Conclusions:

    • Therapeutic trials with high-dose vitamin cofactors are essential for managing certain enzyme deficiencies.
    • Persistence with cofactor therapy is crucial, even without immediate positive outcomes.
    • Cofactor supplementation offers a simplified therapeutic strategy for specific metabolic genetic disorders.

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