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Related Experiment Videos

Normal calcitonin secretion in acromegaly.

S Tabolli, F Bigi, C Valtorta

    Hormone Research
    |January 1, 1987
    PubMed
    Summary

    In active acromegaly, calcium and phosphate metabolism show normal parathyroid hormone levels but increased urinary calcium excretion. Calcitonin secretion is not abnormal in these patients with high bone turnover.

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    Area of Science:

    • Endocrinology
    • Bone Metabolism
    • Mineral Metabolism

    Background:

    • Acromegaly is a condition characterized by excessive growth hormone production.
    • Calcium and phosphate homeostasis are crucial for bone health and overall metabolism.
    • Previous studies have suggested potential alterations in mineral metabolism in acromegaly.

    Purpose of the Study:

    • To investigate calcium and phosphate metabolism in patients with active acromegaly.
    • To assess parathyroid hormone and calcitonin levels and responses in acromegaly.
    • To correlate metabolic findings with bone turnover markers.

    Main Methods:

    • Studied eight patients with active acromegaly.
    • Measured plasma calcium, phosphate, alkaline phosphatase, creatinine, parathyroid hormone, and calcitonin.
    • Assessed urinary calcium excretion and calcium/creatinine ratio.
    • Administered a calcium stimulation test to evaluate calcitonin secretion.

    Main Results:

    • Patients with acromegaly had normal plasma levels of calcium, phosphate, alkaline phosphatase, creatinine, and parathyroid hormone.
    • Elevated urinary calcium excretion, calcium/creatinine ratio, and hydroxyproline were observed compared to controls.
    • Basal plasma calcitonin levels were normal, and calcitonin secretion response to calcium stimulation was similar to normal subjects.

    Conclusions:

    • Normocalcemic acromegaly with high bone turnover does not exhibit abnormal calcitonin secretion.
    • The study highlights altered urinary calcium excretion in active acromegaly despite normal serum calcium levels.
    • Findings suggest that calcitonin plays a normal role in calcium regulation in this specific patient group.

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