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Decrease in insulin secretion related to hypocalcemia induced by a high dose of zinc in rats.

M Yamaguchi, K Takahashi

    Toxicology Letters
    |August 1, 1984
    PubMed
    Summary

    Oral zinc administration in rats lowered blood calcium, impairing glucose tolerance by reducing insulin secretion. Restoring calcium levels reversed these effects, indicating hypocalcemia mediates zinc's impact on insulin.

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    Area of Science:

    • Endocrinology
    • Mineral Metabolism

    Background:

    • Zinc (Zn) plays a crucial role in various physiological processes, including glucose metabolism.
    • Hypocalcemia, a condition of low blood calcium, can affect hormonal regulation.

    Purpose of the Study:

    • To investigate the impact of zinc-induced hypocalcemia on glucose tolerance and insulin secretion in rats.
    • To determine if hypocalcemia is the primary mediator of zinc's effects on glucose metabolism.

    Main Methods:

    • Oral administration of zinc sulfate to fasted rats to induce hypocalcemia.
    • Assessment of glucose tolerance using glucose tolerance tests.
    • Measurement of serum insulin levels.
    • Administration of calcium to restore normal calcium levels and observe effects.

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    Main Results:

    • A single oral dose of zinc sufficient to cause hypocalcemia significantly decreased glucose tolerance in rats.
    • This reduction in glucose tolerance was directly linked to a decrease in insulin secretion.
    • Restoring normal calcium levels (reversing hypocalcemia) completely prevented the adverse effects of zinc on glucose tolerance and insulin secretion.

    Conclusions:

    • Zinc administration-induced hypocalcemia is responsible for the observed decrease in glucose tolerance.
    • The effect of zinc on insulin secretion in rats is a consequence of the resulting hypocalcemia, not a direct effect of zinc itself.