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Calcium binding to intestinal goblet cell mucin.

J F Forstner, G G Forstner

    Biochimica Et Biophysica Acta
    |March 28, 1975
    PubMed
    Summary

    Calcium (Ca2+) binds to rat small intestine goblet cell mucin, with binding influenced by pH and inhibited by salt. This suggests Ca2+ interacts with mucin

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    Area of Science:

    • Biochemistry
    • Gastroenterology
    • Molecular Biology

    Background:

    • Goblet cells in the small intestine secrete mucin, a key component of the mucus layer.
    • Mucin's properties are influenced by its interactions with ions and its structural conformation.
    • Understanding calcium binding to mucin is crucial for comprehending mucus barrier function.

    Purpose of the Study:

    • To investigate the binding characteristics of calcium (Ca2+) to rat small intestine goblet cell mucin.
    • To elucidate the effects of Ca2+ on mucin's biophysical properties, such as absorbance, solubility, and viscosity.
    • To explore the role of sialic acid in Ca2+-mucin interactions.

    Main Methods:

    • Equilibrium dialysis using 45-CaCl2 to quantify Ca2+ binding to mucin.
    • Spectrophotometry to measure changes in mucin absorbance.
    • Viscometry to assess the impact of Ca2+ on mucin viscosity.
    • Chemical modification of mucin (sialic acid removal) to study its effect on binding.

    Main Results:

    • Ca2+ binding to mucin saturates at 0.1-1.0 mM free Ca2+ and is pH-dependent.
    • Binding exhibits sigmoidal kinetics at low Ca2+ concentrations, indicating positive cooperativity.
    • Sialic acid removal significantly reduces Ca2+ binding and abolishes cooperativity.
    • Ca2+ addition causes minor changes in absorbance but significantly decreases mucin viscosity.
    • Ca2+ binding is reduced by high salt concentrations, suggesting competition with other cations.

    Conclusions:

    • Ca2+ binds to negatively charged sites on goblet cell mucin, particularly sialic acid carboxyl groups.
    • Ca2+ binding induces mucin conformational changes, leading to contraction/folding and cooperative cation binding.
    • These interactions influence mucin's biophysical properties, potentially affecting mucus layer integrity.
    • The findings highlight the importance of cation-mucin interactions in gastrointestinal physiology.

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