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Related Experiment Videos

Hyperthyroidism is associated with suppressed circulating ghrelin levels.

Anne Lene Dalkjaer Riis1, Troels Krarup Hansen, Niels Møller

  • 1Medical Department M (Endocrinology and Diabetes), Aarhus University Hospital, Aarhus University, 8000 Aarhus, Denmark. anne.lene.riis@iefk.au.dk

The Journal of Clinical Endocrinology and Metabolism
|February 8, 2003
PubMed
Summary
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In hyperthyroidism, circulating ghrelin levels are reduced, impacting appetite regulation. Medical treatment normalizes ghrelin levels, suggesting thyroid status influences this key appetite hormone.

Area of Science:

  • Endocrinology
  • Metabolism
  • Hormone Regulation

Background:

  • Ghrelin is a hormone known to stimulate growth hormone (GH) secretion, appetite, and food intake.
  • The role of ghrelin in appetite and body weight regulation within the context of hyperthyroidism requires further investigation.

Purpose of the Study:

  • To investigate the involvement of ghrelin in appetite and body weight regulation in hyperthyroid patients.
  • To compare circulating ghrelin levels in hyperthyroid patients before and after treatment with healthy controls.

Main Methods:

  • Measurement of circulating ghrelin levels in nine hyperthyroid patients (pre- and post-treatment) and eight healthy controls.
  • Studies were conducted in a postabsorptive state and during a 3-hour euglycemic hyperinsulinemic clamp.

Related Experiment Videos

  • Thyroid hormone levels (T3) and body weight changes were monitored.

    • Main Results:

    • Hyperthyroid patients exhibited significantly decreased fasting and clamp-state ghrelin levels compared to controls (P = 0.03 and P = 0.02, respectively).
    • Following medical treatment, ghrelin levels in the patients normalized and were comparable to control subjects.
    • A 3-hour euglycemic hyperinsulinemic clamp significantly reduced ghrelin levels across all study groups, irrespective of thyroid status.

    Conclusions:

    • Ghrelin levels are suppressed in hyperthyroidism and normalize with effective antithyroid treatment.
    • Hyperinsulinemia demonstrably suppresses ghrelin secretion, independent of thyroid hormone levels.
    • Ghrelin does not appear to be a primary driver of appetite and food intake in hyperthyroidism; the mechanisms for its suppression remain undetermined.