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Related Experiment Videos

Calcium binding activity by chick intestinal brush-border membrane vesicles

P W Wilson, D E Lawson

    Pflugers Archiv : European Journal of Physiology
    |December 1, 1980
    PubMed
    Summary
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    Chick intestinal brush-border membranes rapidly uptake calcium ions (Ca2+), with binding sites influenced by vitamin D. These sites are more abundant in the duodenum than the ileum.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Physiology

    Background:

    • Intestinal absorption of calcium ions (Ca2+) is crucial for bone health and overall physiology.
    • Brush-border membranes play a key role in nutrient uptake, including Ca2+.

    Purpose of the Study:

    • To investigate the characteristics of Ca2+ uptake by chick intestinal brush-border membrane vesicles.
    • To identify and quantify Ca2+ binding sites within these vesicles.

    Main Methods:

    • Incubation of chick intestinal brush-border membrane vesicles with varying concentrations of Ca2+.
    • Measurement of Ca2+ uptake over time using tracer quantities and mM concentrations.
    • Analysis of Ca2+ binding kinetics and affinity.

    Main Results:

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    • Ca2+ uptake was rapid and extensive, with vesicle concentrations exceeding external levels.
    • A high-affinity Ca2+ binding site was identified (association constant of 5 x 10(-5) M).
    • Vitamin D was found to increase the number of these Ca2+ binding sites, with higher abundance in the duodenum compared to the ileum.

    Conclusions:

    • Chick intestinal brush-border membranes possess a high-affinity Ca2+ binding mechanism.
    • Vitamin D significantly enhances Ca2+ binding capacity in the intestine, particularly in the duodenum.