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Multiple ERbeta antisera label in ERbeta knockout and null mouse tissues.

Melissa A Snyder1, Tereza Smejkalova, Paul M Forlano

  • 1Department of Neurobiology and Physiology, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA. m-ramous@northwestern.edu

Journal of Neuroscience Methods
|February 23, 2010
PubMed
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Most estrogen receptor beta (ERbeta) antibodies fail specificity tests, recognizing proteins in knockout tissues. This study highlights critical issues with ERbeta antibody validation for researchers.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Immunology

Background:

  • Estrogen receptor beta (ERbeta) plays a crucial role in various physiological processes.
  • Accurate detection of ERbeta is essential for research in endocrinology and related fields.
  • Validation of antibodies used in ERbeta research is critical for reliable experimental outcomes.

Purpose of the Study:

  • To characterize the specificity of a custom-made ERbeta antiserum (ck5912).
  • To evaluate the specificity of eight commercially available ERbeta antisera.
  • To identify potential pitfalls in ERbeta antibody validation and interpretation.

Main Methods:

  • Western blot analysis was performed.
  • Antibody recognition was tested against recombinant ERbeta (rERbeta) and ERalpha (rERalpha).

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  • Antibody labeling was assessed in cell lines transfected with ERbeta and ERalpha.
  • Tissue samples from wildtype (WT), ERbeta knockout (betaERKO), and ERbeta null mice (ovary, hypothalamus, hippocampus) were used.

    • Main Results:

    • Most tested ERbeta antisera, including ck5912 and commercial antibodies, showed apparent specificity in initial tests.
    • Western blot analysis revealed that all evaluated ERbeta antibodies recognized identical protein bands in WT, betaERKO, and ERbeta null mouse tissues.
    • This indicates a lack of specificity for ERbeta in all antibodies tested.

    Conclusions:

    • The study demonstrates significant issues with the specificity of commonly used ERbeta antibodies.
    • Researchers may encounter misinterpretations due to non-specific antibody binding.
    • Caution and rigorous validation are necessary when using ERbeta antibodies in research.