Utilization of RNAi to Validate Antibodies for Reverse Phase Protein Arrays

Heiko Mannsperger, Stefan Uhlmann, Ulrike Korf, Özgür Sahin

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Scopus citations

Abstract

Reverse phase protein arrays (RPPAs) emerged as a very useful tool for high-throughput screening of protein expression in large numbers of small specimen. Similar to other protein chemistry methods, antibody specificity is also a major concern for RPPA. Currently, testing antibodies on Western blot for specificity and applying serial dilution curves to determine signal/concentration linearity of RPPA signals are most commonly employed to validate antibodies for RPPA applications. However, even the detection antibodies fulfilling both requirements do not always give the expected result. Chemically synthesized small interfering RNAs (siRNAs) are one of the most promising and time-efficient tools for loss-of-function studies by specifically targeting the gene of interest resulting in a reduction at the protein expression level, and are therefore used to dissect biological processes. Here, we report the utilization of siRNA-treated sample lysates for the quantification of a protein of interest as a useful and reliable tool to validate antibody specificity for RPPAs. As our results indicate, we recommend the use of antibodies which give the highest dynamic range between the control siRNA-treated samples and the target protein (here: EGFR) siRNA-treated ones on RPPAs, to be able to quantify even small differences of protein abundance with high confidence.

Original languageEnglish (US)
Title of host publicationProtein Microarrays
Subtitle of host publicationMethods and Protocols
PublisherHumana Press Inc.
Pages45-54
Number of pages10
ISBN (Print)9781617792854
DOIs
StatePublished - 2011

Publication series

NameMethods in Molecular Biology
Volume785
ISSN (Print)1064-3745
ISSN (Electronic)1940-6029

Keywords

  • Antibody specificity
  • Antibody validation
  • Epidermal growth factor receptor
  • RNAi
  • Reverse phase protein arrays
  • SiRNAs

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics

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