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A laser microdissection-based workflow for FFPE tissue microproteomics: Important considerations for small sample

Rémi Longuespée1, Deborah Alberts2, Charles Pottier3

  • 1Mass Spectrometry Laboratory, Systems Biology and Chemical Biology, GIGA-Research, University of Liège, Liège, Belgium; Proteopath GmbH, Trier, Germany.

Methods (San Diego, Calif.)
|December 23, 2015
PubMed
Summary
This summary is machine-generated.

A new citric acid antigen retrieval (CAAR) method enables reproducible proteomic analysis of small formalin-fixed paraffin-embedded (FFPE) tissue samples. This breakthrough allows for biomarker discovery in early cancerous lesions using mass spectrometry.

Keywords:
BiomarkersCancerFormalin fixed paraffin embeddedLaser microdissectionMass spectrometryProteomics

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Area of Science:

  • Biochemistry
  • Molecular Pathology
  • Proteomics

Background:

  • Proteomic analysis of formalin-fixed paraffin-embedded (FFPE) tissues is crucial for molecular pathology research.
  • Existing methods struggle with analyzing extremely small tissue samples, hindering biomarker discovery in early disease stages.
  • There is a significant need for reproducible methods to process micro-scale FFPE samples.

Purpose of the Study:

  • To develop and validate a reproducible proteomic method for analyzing laser microdissected FFPE tissue samples.
  • To enable biomarker discovery from extremely limited tissue amounts, such as early cancerous lesions.
  • To establish optimized protocols for handling and processing minute FFPE samples for mass spectrometry.

Main Methods:

  • Testing various processing procedures for laser microdissected FFPE tissue pieces (<3000 cells).
  • Establishing a citric acid antigen retrieval (CAAR)-based protocol.
  • Optimizing liquid chromatography-mass spectrometry-mass spectrometry (LC-MS/MS) settings for sensitive analysis.
  • Performing differential proteomic analysis on invasive breast carcinoma and invasive lobular triple-negative breast cancer tissues.

Main Results:

  • Identification of over 1400 proteins from a single microdissected breast cancer biopsy using the CAAR method.
  • Demonstration of reproducible processing for extremely small FFPE tissue samples.
  • Successful differential proteomic analysis for biomarker discovery in distinct breast cancer subtypes.

Conclusions:

  • The CAAR-based procedure provides a robust method for proteomic analysis of minute FFPE samples.
  • This approach opens new avenues for biomarker discovery in molecular pathology, especially for early-stage diseases.
  • The method supports applications like matrix-assisted laser desorption/ionization (MALDI) imaging for microproteomics.