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Related Experiment Videos

Macroprolactinemia presenting like a pituitary tumor.

R D Jackson, J Wortsman, W B Malarkey

    The American Journal of Medicine
    |February 1, 1985
    PubMed
    Summary

    Massive hyperprolactinemia, often indicating a pituitary tumor, can be caused by macroprolactin. This condition involves larger prolactin molecules and is not progressive.

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    Area of Science:

    • Endocrinology
    • Reproductive Medicine
    • Molecular Endocrinology

    Background:

    • Elevated serum prolactin levels (>200 ng/ml) in nonpregnant women typically suggest a pituitary tumor.
    • A case study investigated a patient with persistently high prolactin levels (350-400 ng/ml) but no detectable pituitary adenoma.

    Observation:

    • The patient exhibited a blunted nocturnal rise in prolactin secretion.
    • Dopamine infusion normally inhibited prolactin release, and thyrotropin-releasing hormone showed a blunted prolactin stimulation.
    • Serum analysis revealed that over 85% of immunoreactive prolactin consisted of large molecular weight forms (>100,000 daltons), termed macroprolactin.

    Findings:

    • The patient's hyperprolactinemia was attributed to macroprolactin, characterized by high molecular weight prolactin variants.
    • This contrasts with typical hyperprolactinemic states where the predominant prolactin form has a molecular weight of 22,000 daltons.
    • Macroprolactinemia appears to be a nonprogressive condition.

    Implications:

    • Macroprolactinemia represents a novel cause of massive hyperprolactinemia, distinct from pituitary adenomas.
    • This finding necessitates reconsidering diagnostic approaches for hyperprolactinemia, especially in the absence of pituitary tumors.
    • Understanding macroprolactinemia can lead to improved patient management and avoid unnecessary investigations for pituitary adenomas.

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