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Related Experiment Videos

Calcium uptake by isolated rat intestinal cells.

F Bronner, D Pansu, A Bosshard

    Journal of Cellular Physiology
    |September 1, 1983
    PubMed
    Summary

    Isolated intestinal cells show that calcium uptake is temperature and concentration dependent. Vitamin D significantly influences this uptake, particularly in the duodenum, suggesting a role in intestinal calcium absorption.

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    Area of Science:

    • Cell Biology
    • Nutritional Science
    • Gastroenterology

    Background:

    • Intestinal calcium absorption is crucial for maintaining calcium homeostasis.
    • Vitamin D plays a key role in regulating intestinal calcium transport.
    • Understanding the cellular mechanisms of calcium uptake is essential.

    Purpose of the Study:

    • To investigate calcium uptake in isolated intestinal cells.
    • To determine the influence of temperature, concentration, and vitamin D status on cellular calcium uptake.
    • To explore the relationship between cellular calcium uptake and intestinal calcium absorption.

    Main Methods:

    • Isolation of intestinal cells from rat duodenum, jejunum, and ileum using mechanical and enzymatic methods.
    • Assay of calcium uptake via a rapid filtration procedure.
    • Comparison of calcium uptake in vitamin D-deficient and vitamin D-replete rats, including effects of 1,25-dihydroxyvitamin D3 repletion.

    Main Results:

    • Calcium uptake by intestinal cells is time- and concentration-dependent, increasing with temperature (25°C and 37°C vs. 0°C).
    • Duodenal cells exhibited higher calcium uptake than jejunal, which had higher uptake than ileal cells.
    • Vitamin D deficiency reduced duodenal calcium uptake, which was restored by vitamin D repletion and approximated ileal cell uptake in replete rats.

    Conclusions:

    • Cellular calcium uptake in isolated intestinal cells parallels tissue transport findings.
    • Cellular calcium uptake may be linked to the saturable component of intestinal calcium absorption.
    • Isolated intestinal cells provide a valuable experimental model for studying transcellular calcium transport.

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