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Related Experiment Videos

Decreased insulin receptor binding in hyperthyroidism.

G Schernthaner, R Prager, M Weissel

    Klinische Wochenschrift
    |November 15, 1984
    PubMed
    Summary

    Hyperthyroidism is linked to glucose intolerance due to reduced insulin receptors on cells. This study found fewer insulin receptors in hyperthyroid patients, contributing to insulin resistance.

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    Area of Science:

    • Endocrinology
    • Metabolic Research
    • Thyroid Disease

    Background:

    • Hyperthyroidism is associated with glucose intolerance, but its underlying mechanisms remain complex.
    • Insulin resistance is a potential factor in the metabolic disturbances observed in hyperthyroid patients.

    Purpose of the Study:

    • To investigate insulin receptor binding and its relationship to glucose metabolism in hyperthyroidism.
    • To determine whether altered insulin receptor number or affinity contributes to glucose intolerance in hyperthyroid individuals.

    Main Methods:

    • Studied 125I-insulin binding to mononuclear leukocytes in ten hyperthyroid patients and 20 controls.
    • Assessed glucose and C-peptide levels after oral glucose load and insulin infusion.
    • Utilized Scatchard analysis to evaluate insulin receptor number and affinity.

    Main Results:

    • Hyperthyroid patients exhibited elevated glucose levels and a delayed hypoglycaemic response to insulin.
    • Insulin binding to monocytes was significantly reduced in hyperthyroid patients.
    • Scatchard analysis indicated a decrease in insulin receptor number, not affinity, as the cause of reduced binding.

    Conclusions:

    • Reduced insulin receptor number in hyperthyroidism contributes to peripheral insulin resistance.
    • This insulin resistance plays a role in the complex pathophysiology of glucose intolerance in hyperthyroidism.
    • Findings highlight the impact of thyroid hormones on insulin signaling and glucose homeostasis.

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