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Related Experiment Videos

Intestinal calcium absorption: mechanisms and applications.

F Bronner

    The Journal of Nutrition
    |August 1, 1987
    PubMed
    Summary

    Dietary calcium absorption occurs via two pathways: vitamin D-regulated transcellular transport and a nonsaturable paracellular route. Calcium-binding protein (CaBP) amplifies transcellular calcium movement, while increased intake is the simplest absorption method.

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    Area of Science:

    • Gastroenterology
    • Nutritional Science
    • Molecular Biology

    Background:

    • Intestinal calcium absorption is crucial for maintaining calcium homeostasis.
    • Two distinct mechanisms govern calcium absorption: transcellular and paracellular.

    Purpose of the Study:

    • To elucidate the mechanisms of intestinal calcium absorption.
    • To differentiate the roles of vitamin D, calcium-binding protein (CaBP), and intake levels.

    Main Methods:

    • Kinetic analysis of calcium transport.
    • Review of evidence supporting distinct absorption pathways.

    Main Results:

    • Transcellular absorption is saturable, vitamin D-dependent, mediated by CaBP, and localized to the proximal intestine.
    • Paracellular absorption is nonsaturable, occurs throughout the intestine, and is not directly influenced by vitamin D or intake.
    • CaBP amplifies intracellular calcium movement, facilitating high transcellular transport rates.

    Conclusions:

    • Vitamin D regulates active calcium transport via CaBP, but can have off-target effects.
    • Increasing dietary calcium intake is the most straightforward method to enhance absorption.
    • Further research into paracellular pathway modulation may offer new strategies for absorption control.

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