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Related Experiment Videos

Requirement for ascorbic acid in a rat mutant unable to synthesize ascorbic acid.

F Horio, K Ozaki, A Yoshida

    The Journal of Nutrition
    |December 1, 1985
    PubMed
    Summary

    Osteogenic disorder (OD) rats cannot synthesize ascorbic acid due to lacking L-gulonolactone oxidase activity. Dietary vitamin C supplementation prevents deficiency signs and promotes growth, with optimal levels for enzyme activity varying.

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    Area of Science:

    • Biochemistry
    • Nutritional Science
    • Animal Models

    Background:

    • Ascorbic acid (vitamin C) is essential for numerous physiological processes.
    • The OD rat is a genetic model with impaired endogenous ascorbic acid synthesis.
    • Understanding vitamin C metabolism and requirements is crucial for health.

    Purpose of the Study:

    • To investigate ascorbic acid synthesis in OD rats.
    • To determine the dietary ascorbic acid requirement for OD rats.
    • To assess the impact of vitamin C deficiency on enzyme activities and physiological markers.

    Main Methods:

    • Enzyme activity assays in liver tissue.
    • Analysis of hepatic cytochrome P-450 content.
    • Measurement of serum and adrenal corticosterone levels.

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  • Assessment of urinary hydroxyproline excretion.

    • Main Results:

    • OD rats lack hepatic L-gulonolactone oxidase activity, confirming impaired ascorbic acid synthesis.
    • Ascorbic acid deficiency in OD rats led to hemorrhage, reduced cytochrome P-450, and altered corticosterone levels.
    • A dietary intake of 300 mg/kg ascorbic acid prevented deficiency symptoms and supported maximal growth.

    Conclusions:

    • OD rats are a valid model for studying vitamin C deficiency due to their inability to synthesize ascorbic acid.
    • Dietary ascorbic acid supplementation is necessary for OD rats.
    • Optimal dietary ascorbic acid levels are approximately 300 mg/kg for growth, but higher amounts may be needed for maximal drug-metabolizing enzyme activity.