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Related Experiment Videos

The intestinal absorption of folates.

C H Halsted

    The American Journal of Clinical Nutrition
    |April 1, 1979
    PubMed
    Summary

    Dietary folates (pteroylpolyglutamates) require hydrolysis by folate conjugase in the jejunum to pteroylmonoglutamyl folate for absorption. Key questions remain regarding the enzyme

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    Area of Science:

    • Gastroenterology
    • Nutritional Biochemistry
    • Molecular Biology

    Background:

    • Dietary folates, mainly pteroylpolyglutamates, are absorbed in the jejunum.
    • Absorption involves hydrolysis to pteroylmonoglutamyl folate by folate conjugase.
    • Controversies exist regarding folate hydrolysis and transport mechanisms.

    Purpose of the Study:

    • To investigate the location and mechanism of folate hydrolysis in the intestine.
    • To clarify whether pteroylmonoglutamate transport is active or passive.
    • To determine the relationship between intestinal folate metabolism and transport.

    Main Methods:

    • Enzyme assays to identify folate conjugase activity.
    • Intestinal tissue analysis to determine enzyme localization (surface vs. intracellular).
    • Transport studies using isolated intestinal cells or tissues.

    Main Results:

    • Evidence suggests intestinal mucosal enzymes (folate conjugase) are crucial for hydrolysis.
    • The precise location of folate hydrolysis (brush border membrane vs. intracellular) requires further investigation.
    • The active or passive nature of pteroylmonoglutamate transport remains debated.
    • The interplay between intestinal folate metabolism and absorption is not fully elucidated.

    Conclusions:

    • Folate conjugase is essential for dietary folate absorption.
    • Further research is needed to resolve controversies surrounding folate hydrolysis location and transport mechanisms.
    • Understanding these processes is vital for addressing folate bioavailability and nutritional status.

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