Abstract
Antibodies can cross-react with proteins other than their intended targets, and antibody-based applications can, if not properly validated, lead to flawed interpretations. When evaluating 13 anti-estrogen receptor beta (ERβ) antibodies in 2017, we concluded that only one of them was specific. Applying this antibody in immunohistochemistry of over 44 different normal human tissues and 20 types of cancers revealed ERβ expression in only a few selected tissues. This aligned with mRNA evidence but contradicted a large set of published literature. ERβ protein expression continues to be reported in tissues without clear support by mRNA expression. In this chapter, we describe how ERβ antibodies can be thoroughly validated and discuss selection of well-characterized positive and negative controls. The validation scheme presented is applicable for immunohistochemistry and Western blotting. The protocol includes evaluation of mRNA evidence, use of public databases, assessment of on- and off-target binding, and an optional step for corroboration with immunoprecipitation and mass spectrometry.
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Acknowledgments
We would like to thank Sandra Andersson, Anna Asplund, Mårten Sundberg, and Margareta Ramström (all previously at Uppsala University) for the original set up of key parts of this method. Data generated by the TCGA Research Network (http://cancergenome.nih.gov/), GTEx (http://www.gtexportal.org/), and the Human Protein Atlas (www.proteinatlas.org) have been utilized. This work was supported by the Swedish Cancer Society (CAN 2018/596) and the Swedish Research Council (2017-01658), and benefitted from funding for the Human Protein Atlas Funding provided by the Knut and Alice Wallenberg Foundation.
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Birgersson, M., Katona, B., Lindskog, C., Pontén, F., Williams, C. (2022). Antibody Validation for Estrogen Receptor Beta. In: Eyster, K.M. (eds) Estrogen Receptors. Methods in Molecular Biology, vol 2418. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1920-9_1
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DOI: https://doi.org/10.1007/978-1-0716-1920-9_1
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