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Related Experiment Videos

Diminished prolactin reserve in acromegaly.

I M Spitz, D Barzilai, R Luboshitzky

    Metabolism: Clinical and Experimental
    |September 1, 1980
    PubMed
    Summary

    Acromegaly patients show varied prolactin (PRL) secretion. Some have high basal PRL, while most exhibit impaired PRL response to TRH and metoclopramide, suggesting pituitary dysfunction.

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    Area of Science:

    • Endocrinology
    • Neuroendocrinology
    • Pituitary Disorders

    Background:

    • Acromegaly, a condition caused by excess growth hormone (GH), can affect other pituitary hormone secretions.
    • Prolactin (PRL) regulation is complex, involving hypothalamic and pituitary factors.

    Purpose of the Study:

    • To investigate prolactin (PRL) secretion patterns in patients with acromegaly.
    • To assess the PRL response to various stimuli in acromegalic individuals.

    Main Methods:

    • Evaluated PRL levels in twenty acromegalic patients.
    • Assessed basal PRL, PRL response to TRH (thyrotropin-releasing hormone), metoclopramide (MET), and insulin-induced hypoglycemia.
    • Measured LH, FSH, cortisol, and thyroid function tests.

    Main Results:

    • Five patients had persistent hyperprolactinemia.
    • The majority showed decreased basal PRL levels with blunted responses to TRH and MET.
    • No PRL rise was observed following insulin hypoglycemia, despite adequate cortisol response.

    Conclusions:

    • Acromegaly can be associated with both hyperprolactinemia and impaired PRL reserve.
    • Hyperprolactinemia may stem from tumor secretion or impaired dopamine transport.
    • Decreased PRL reserve could be due to reduced lactotrope cell mass or increased dopaminergic activity.

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