A Recommended and Verified Procedure for in Situ Tryptic Digestion of Formalin-fixed Paraffin-embedded Tissues for Analysis by Matrix-assisted Laser Desorption/ionization Imaging Mass Spectrometry

Overview

Journal J Mass Spectrom

Publisher Wiley

Date 2019 Jun 30

PMID 31254303

Citations 18

Authors

Audra M Judd

Danielle B Gutierrez

Jessica L Moore

Nathan Heath Patterson

Junhai Yang

Carrie E Romer

Jeremy L Norris

Richard M Caprioli

Affiliations

Soon will be listed here.

Abstract

Matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) is a molecular imaging technology uniquely capable of untargeted measurement of proteins, lipids, and metabolites while retaining spatial information about their location in situ. This powerful combination of capabilities has the potential to bring a wealth of knowledge to the field of molecular histology. Translation of this innovative research tool into clinical laboratories requires the development of reliable sample preparation protocols for the analysis of proteins from formalin-fixed paraffin-embedded (FFPE) tissues, the standard preservation process in clinical pathology. Although ideal for stained tissue analysis by microscopy, the FFPE process cross-links, disrupts, or can remove proteins from the tissue, making analysis of the protein content challenging. To date, reported approaches differ widely in process and efficacy. This tutorial presents a strategy derived from systematic testing and optimization of key parameters, for reproducible in situ tryptic digestion of proteins in FFPE tissue and subsequent MALDI IMS analysis. The approach describes a generalized method for FFPE tissues originating from virtually any source.

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