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Magnesium movement in hypothyroid sheep.

F C Madsen, G E Spalding, J K Miller

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |May 1, 1975
    PubMed
    Summary
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    Hypothyroidism in sheep reduces 28-magnesium absorption from the gastrointestinal tract but increases overall magnesium retention. Digestive residue passage rate impacts magnesium availability.

    Area of Science:

    • Physiology
    • Endocrinology
    • Nutritional Science

    Background:

    • Magnesium (Mg) is essential for numerous physiological processes.
    • Thyroid hormones play a role in regulating mineral metabolism.
    • The impact of hypothyroidism on Mg transport and absorption requires further elucidation.

    Purpose of the Study:

    • To investigate the effects of hypothyroidism on magnesium (Mg) transport and absorption in sheep.
    • To quantify Mg kinetics using a biomodel in hypothyroid and normal sheep.

    Main Methods:

    • Utilized an eight-compartment biomodel to analyze 28-magnesium (28-Mg) kinetics.
    • Employed a least-squares technique to fit model parameters to experimental data.
    • Collected data from multiple compartments and routes of 28-Mg entry.

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    Main Results:

    • Hypothyroidism significantly reduced transfer coefficients for 28-Mg absorption from the gastrointestinal tract (P < 0.01).
    • The rate coefficient for endogenous 28-Mg fecal losses was not altered by hypothyroidism (P < 0.05).
    • Nutritional balance studies showed increased Mg absorption and retention in hypothyroid sheep.

    Conclusions:

    • Hypothyroidism impairs gastrointestinal Mg absorption but enhances overall Mg retention in sheep.
    • Slower passage of digestive residues in hypothyroid sheep increases the mean retention time, improving Mg availability.
    • Thyroid status influences Mg homeostasis through effects on absorption and retention dynamics.