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Serum gastrin levels in patients with thyroid dysfunction.

K Sagara, T Shimada, S Fujiyama

    Gastroenterologia Japonica
    |April 1, 1983
    PubMed
    Summary
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    Thyroid hormone levels impact gastrin, a digestive hormone. Hyperthyroidism elevates gastrin, while hypothyroidism lowers it, with varying correlations observed during treatment.

    Area of Science:

    • Endocrinology
    • Gastroenterology
    • Hormone Regulation

    Background:

    • Thyroid hormones significantly influence various bodily functions, including gastrointestinal activity.
    • Serum gastrin levels have been observed to fluctuate in patients with thyroid dysfunction.

    Purpose of the Study:

    • To investigate the relationship between thyroid hormone levels and serum gastrin concentrations.
    • To explore how thyroid hormone replacement therapy affects gastrin levels and their correlation.

    Main Methods:

    • Fasting serum gastrin levels were measured using radioimmunoassay in hyperthyroid, hypothyroid, and normal subjects.
    • Oral beef extract challenge was administered to assess gastrin response in hyperthyroid patients and controls.
    • Serum gastrin and triiodothyronine (T3) levels were correlated before and after treatment to restore the euthyroid state.

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    Main Results:

    • Fasting serum gastrin was elevated in hyperthyroidism and decreased in hypothyroidism.
    • Hyperthyroid patients showed a greater gastrin increase after beef extract administration compared to normal subjects.
    • A significant positive correlation (r=0.50) was found between gastrin and T3 levels post-treatment, with distinct patient subgroups identified pre-treatment based on gastrin-T3 correlation (r=0.83 and r=0.81).

    Conclusions:

    • Thyroid status directly influences fasting serum gastrin levels.
    • Thyroid hormone replacement normalizes the gastrin response to stimuli and establishes a significant correlation with T3 levels.
    • Heterogeneity in G-cell sensitivity to thyroid hormones may explain differing gastrin-T3 relationships in hyperthyroid patients.