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Related Experiment Videos

Protamine-precipitated estrogen receptor: a solid-phase ligand exchange assay.

G C Chamness, K Huff, W L McGuire

    Steroids
    |May 1, 1975
    PubMed
    Summary

    This study introduces a new method to distinguish between free cytoplasmic estrogen receptor (R) and estradiol-bound estrogen receptor (RE) using protamine sulfate precipitation. This technique enables separate quantification of both receptor forms for improved steroid receptor analysis.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Biochemistry

    Background:

    • Cytoplasmic estrogen receptors (R) exist in free or bound (RE) forms.
    • Both forms are precipitable by protamine sulfate from cytosols.
    • Distinguishing between free and bound receptors is crucial for accurate analysis.

    Purpose of the Study:

    • To develop a novel method for the separate determination of free cytoplasmic estrogen receptor (R) and estradiol-bound estrogen receptor (RE).
    • To leverage differential binding characteristics after protamine precipitation for quantitative analysis.
    • To establish a versatile assay applicable to other steroid receptors.

    Main Methods:

    • Cytosols were treated with protamine sulfate to precipitate both free (R) and bound (RE) estrogen receptors.
    Keywords:
    BiologyEndocrine SystemEstradiol--analysisEstrogensExaminations And DiagnosesHormone ReceptorsHormonesLaboratory Examinations And DiagnosesLaboratory ProceduresMembrane ProteinsPhysiology

    Related Experiment Videos

  • Free R was shown to bind 3-H-estradiol-17beta quantitatively at both 0 and 30 degrees Celsius.
  • Bound RE demonstrated hormone exchange binding of 3-H-estradiol-17beta exclusively at 30 degrees Celsius.

    • Main Results:

    • A quantitative method was established to differentiate and measure both free (R) and bound (RE) cytoplasmic estrogen receptors.
    • The method relies on the distinct temperature-dependent binding kinetics of 3-H-estradiol-17beta to precipitated R and RE.
    • Successful separate determination of R and RE was achieved.

    Conclusions:

    • The developed method allows for the precise separate quantification of free and estradiol-bound cytoplasmic estrogen receptors.
    • This assay offers a valuable tool for steroid receptor research, particularly in complex biological samples.
    • The methodology is potentially adaptable for the analysis of other steroid receptor types.