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Related Experiment Video

Updated: Jun 28, 2026

The Use of Reverse Phase Protein Arrays (RPPA) to Explore Protein Expression Variation within Individual Renal Cell Cancers
12:22

The Use of Reverse Phase Protein Arrays (RPPA) to Explore Protein Expression Variation within Individual Renal Cell Cancers

Published on: January 22, 2013

Reverse-phase protein lysate microarrays for cell signaling analysis.

Brett Spurrier1, Sundhar Ramalingam, Satoshi Nishizuka

  • 1Molecular Translational Technology Section, Molecular Therapeutics Program, National Cancer Institute, National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892, USA.

Nature Protocols
|November 1, 2008
PubMed
Summary

Reverse-phase protein lysate microarray (RPA) assays offer a highly efficient method for quantitative proteomic analysis. This technique enables rapid, large-scale data generation from minimal sample volumes, ideal for validating protein network models.

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Area of Science:

  • Proteomics
  • Biotechnology
  • Systems Biology

Background:

  • Reverse-phase protein lysate microarray (RPA) assays are effective for quantitative immunochemical protein detection across numerous samples.
  • Large-scale sample collection is typically labor-intensive and time-consuming.
  • RPA assays provide unique opportunities for quantitative interpretation of theoretical protein networks.

Purpose of the Study:

  • To highlight the efficiency and utility of RPA assays for large-scale proteomic analysis.
  • To present RPA as a method for experimental validation of theoretical protein network models.

Main Methods:

  • Utilizes micro-scale, cell lysate dot blots printed to a substrate.
  • Employs quantitative immunochemical protein detection.
  • Leverages specific antibodies for high-throughput data generation.

Main Results:

  • RPA can generate 1,000 times more data points than western blots using 10,000 times less sample volume.
  • Enables simultaneous monitoring of quantitative proteomic responses across various time-scale and input-dose gradients.
  • Collection of hundreds of sample lysates and subsequent RPA assay can be completed within approximately 13 days.

Conclusions:

  • RPA assays are an excellent method for the experimental validation of theoretical protein network models.
  • The technique offers significant advantages in terms of sample volume and data output compared to traditional methods like western blotting.