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Related Experiment Videos

Estrogen receptor analysis by flow cytometry.

N T Van, M Raber, G H Barrows

    Science (New York, N.Y.)
    |May 25, 1984
    PubMed
    Summary
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    A new fluorescently labeled estradiol (FE) allows precise measurement of estrogen receptor content in tumor cells. This method is specific, requires few cells, and reveals receptor expression heterogeneity.

    Area of Science:

    • Endocrinology
    • Cell Biology
    • Biochemistry

    Background:

    • Estrogen receptors play a crucial role in various physiological processes and diseases, including cancer.
    • Accurate quantification of estrogen receptor levels is essential for diagnosis and treatment selection.
    • Existing methods for estrogen receptor measurement can be labor-intensive and require large sample sizes.

    Purpose of the Study:

    • To develop and validate a novel fluorescently labeled estradiol, N'-fluoresceino-N'-(17 beta-estradiol hemisuccinamide) thiourea (FE), for quantifying estrogen receptor content in tumor cells.
    • To assess the specificity and affinity of FE binding to estrogen receptors.
    • To evaluate the utility of FE for analyzing estrogen receptor heterogeneity in cell populations.

    Main Methods:

    Related Experiment Videos

  • Synthesis and labeling of estradiol with fluorescein to create FE.
  • Quantitative measurement of cellular FE content using flow cytometry.
  • Competition assays with various steroid hormones to determine binding specificity.

    • Main Results:

    • FE binds to estrogen receptors with high affinity in the nanomolar range.
    • FE binding is specific for estrogens, showing no competition with progestins, androgens, or glucocorticosteroids.
    • The assay requires a small sample size (approximately 5000 cells) and allows for the assessment of estrogen receptor expression heterogeneity.

    Conclusions:

    • FE is a specific and high-affinity fluorescent probe for quantifying estrogen receptors in cells.
    • This novel flow cytometry-based assay offers a sensitive and efficient method for measuring estrogen receptor content and heterogeneity.
    • FE provides a valuable tool for research and potentially for clinical applications requiring precise estrogen receptor analysis.