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Dopamine does not affect parathyroid function in man

S Bansal, P D Woolf, J A Fischer

    The Journal of Clinical Endocrinology and Metabolism
    |March 1, 1982
    PubMed
    Summary
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    Dopamine (DA) does not affect parathyroid hormone (PTH) secretion in humans, unlike in cattle. This suggests significant species variation in how biogenic amines regulate PTH.

    Area of Science:

    • Endocrinology
    • Neuroendocrinology
    • Calcium homeostasis

    Background:

    • Conflicting evidence exists regarding dopamine's (DA) role in parathyroid gland function.
    • While DA stimulates parathormone (PTH) secretion in cattle, studies on human parathyroid cells have yielded inconsistent results.

    Purpose of the Study:

    • To investigate the effect of dopamine infusion on parathyroid hormone (PTH) levels in normal human volunteers.
    • To determine if dopamine influences PTH secretion in humans, addressing species-specific differences in endocrine regulation.

    Main Methods:

    • A 30-minute intravenous infusion of dopamine (4 micrograms/kg/min) was administered to five healthy male volunteers.
    • Parathyroid hormone (PTH) levels were measured using radioimmunoassay (RIA).
    • Prolactin (PRL) levels and total calcium were monitored throughout the infusion.

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    Main Results:

    • Dopamine infusion did not alter parathyroid hormone (PTH) levels in normal human subjects.
    • The dopamine infusion effectively lowered prolactin (PRL) levels, confirming the dosage's physiological impact.
    • Total calcium levels remained unchanged during the dopamine infusion.

    Conclusions:

    • The human parathyroid gland appears unresponsive to dopamine, contrasting with findings in cattle.
    • This study highlights significant species variation in the regulation of parathyroid hormone (PTH) secretion by biogenic amines.
    • Dopamine's role in modulating parathyroid function is species-dependent.