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Related Experiment Videos

An antiestrogen-binding protein in human tissues.

O L Kon

    The Journal of Biological Chemistry
    |March 10, 1983
    PubMed
    Summary

    Researchers discovered a unique antiestrogen-binding protein in human tissues. This protein specifically binds nonsteroidal antiestrogens, distinct from the estrogen receptor, and is present even where estrogen receptors are undetectable.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Pharmacology

    Background:

    • Nonsteroidal antiestrogens, like triphenylethylene derivatives, are typically thought to interact with the estrogen receptor.
    • However, some evidence suggests the presence of a distinct binding protein for these compounds in estrogen target tissues.
    • Existing data could also be explained by conformational changes or aggregation states of the estrogen receptor.

    Purpose of the Study:

    • To investigate the existence and characteristics of a specific binding protein for nonsteroidal antiestrogens in human myometrial cytosol.
    • To differentiate this potential binding protein from the established estrogen receptor.

    Main Methods:

    • Binding assays using radiolabeled tamoxifen ([3H]tamoxifen) to quantify binding affinity and specificity.
    • Competitive binding studies with estradiol and other steroid hormones.
    • Biophysical characterization including sedimentation analysis and molecular sieve chromatography (DEAE-Sephacel).
    • Differential thermal stability assays.

    Main Results:

    • Demonstrated a high-affinity binding protein (Kd = 2.3 X 10(-9) M) for [3H]tamoxifen in human myometrial cytosol.
    • This protein showed high specificity for nonsteroidal antiestrogens, with weak competition from estradiol and no competition from other steroids.
    • Sedimentation and chromatography revealed the antiestrogen-binding protein is larger and biochemically distinct from the estrogen receptor (eluting at lower KCl concentration).
    • Differential thermal stability confirmed the distinct nature of the two proteins.
    • The antiestrogen-binding protein was found ubiquitously, even in tissues lacking detectable estrogen receptor.

    Conclusions:

    • The findings provide strong evidence for the separate existence of an antiestrogen-binding protein.
    • This distinct protein plays a role in the action of nonsteroidal antiestrogens.
    • Its presence in various tissues, independent of estrogen receptor levels, suggests broader implications in hormonal regulation and drug action.

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