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Related Experiment Videos

Human placental ferritin receptor.

M Takami, K Mizumoto, I Kasuya

    Biochimica Et Biophysica Acta
    |October 29, 1986
    PubMed
    Summary

    Human placental brush-border membranes possess specific receptors for apoferritin. These receptors bind horse spleen apoferritin, indicating a potential role in iron transport or related placental functions.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Physiology

    Background:

    • Human placental brush-border membranes play crucial roles in nutrient and waste transport.
    • Understanding the molecular interactions at the brush border is vital for comprehending placental function.

    Purpose of the Study:

    • To investigate the presence and characteristics of ferritin binding sites on human placental brush-border membranes.
    • To determine if these binding sites exhibit specificity for apoferritin.

    Main Methods:

    • Preparation and purity assessment of human placental brush-border membranes using biochemical and morphological techniques.
    • Ferritin binding assays using radiolabeled horse spleen apoferritin (125I-apoferritin).
    • Competitive binding studies with excess ferritin and transferrin to assess binding specificity.

    Main Results:

    • Ferritin binding to placental membranes reached completion within 10 minutes at 37°C and pH 7.5.
    • Binding was proportional to membrane concentration and saturable, indicating specific receptor-ligand interaction.
    • A dissociation constant (Ka) of 2.3 x 10(7) M-1 at pH 7.5 was determined for ferritin binding.
    • Horse spleen apoferritin binding was inhibited by homologous ferritin and, to a lesser extent, by human transferrin.

    Conclusions:

    • Human placental brush-border membranes possess specific receptors capable of binding apoferritin molecules.
    • These findings suggest a potential mechanism for iron uptake or transport mediated by apoferritin at the maternal-fetal interface.

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