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Related Experiment Videos

Melatonin and malignant disease.

L Tamarkin, O F Almeida, D N Danforth

    Ciba Foundation Symposium
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Melatonin may protect against hormone-dependent cancers like breast cancer by influencing estrogen receptors. However, its rhythm blunting in patients suggests a complex relationship, limiting its use as a screening tool.

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    Area of Science:

    • Endocrinology
    • Oncology
    • Chronobiology

    Background:

    • The pineal gland hormone melatonin's role in malignant diseases, particularly hormone-dependent tumors, is under investigation.
    • Previous studies suggest melatonin may have protective effects against certain cancers.

    Purpose of the Study:

    • To investigate the relationship between melatonin, pinealectomy, and hormone-dependent tumors, focusing on mammary tumors in rats.
    • To explore melatonin's mechanism of action, potentially involving prolactin suppression or estrogen receptor modulation.
    • To examine the correlation between melatonin levels and estrogen receptor concentration in human breast cancer patients.

    Main Methods:

    • Studies involving 7,12-dimethylbenz[a]anthracene-induced mammary tumors in rats to assess the effects of melatonin and pinealectomy.

    Related Experiment Videos

  • Experiments on hamsters (juvenile and adult) and a human breast cancer cell line to evaluate melatonin's impact on estrogen receptors and estrogen-stimulated growth.
  • Analysis of the correlation between peak plasma melatonin levels and estrogen receptor concentration in women with breast cancer.
  • Assessment of daily melatonin profiles in women at high risk for breast cancer.

    • Main Results:

    • Melatonin administration protected against, while pinealectomy enhanced, chemically induced mammary tumors in rats.
    • Melatonin inhibited estrogen-stimulated growth in ovariectomized hamsters and human breast cancer cells.
    • An inverse correlation was observed between tumor estrogen receptor concentration and peak plasma melatonin levels in breast cancer patients.
    • Daily melatonin profiles did not differ between women at high risk for breast cancer and the normal population.

    Conclusions:

    • Melatonin exhibits a protective role in hormone-dependent cancers, potentially through estrogen receptor modulation.
    • A robust daily melatonin rhythm may be crucial for its protective effect against hormone-dependent breast cancer.
    • Plasma melatonin levels are not a reliable screening tool for breast cancer risk.
    • Further clinical investigation into melatonin's role in endocrine-related cancers is warranted.