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Queries of MALDI-Imaging Global Datasets Identifying Ion Mass Signatures Associated with Tissue Compartments

På svenska

Author

  • Thomas Fehniger
  • Frank Suits
  • Ákos Végvári
  • Peter Horvatovich
  • Martyn Foster
  • György Marko-Varga

Summary, in English

Scanning mass spectrometry by matrix assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) creates large volumetric global datasets that describe the location and identity of ions registered at each sampling location. While thousands of ion peaks are recorded in a typical whole tissue analysis, only a fraction of these measured molecules are purposefully scrutinized within a given experimental design. To address this need, we recently reported new methods to query the full volume of MALDI-MSI data that correlate all ion masses to one another. As an example of this utility we demonstrate that specific ion peak m/z signatures can be used to localize similar histological structures within tissue samples. In this study we use the example of ion peak masses that are associated with tissue spaces occupied by airway bronchioles in rat lung samples. The volume of raw data was pre-processed into structures of 0.1 mass unit bins containing metadata collected at each sampling position. Interactive visualization in Paraview identified ion peaks that especially showed strong association with airway bronchioles but not vascular or parenchymal tissue compartments. Further iterative statistical correlation queries provided ranked indices of all m/z values in the global dataset regarding co-incident distributions at any given X,Y position in the histological spaces occupied by bronchioles The study further provides methods for extracting important information contained in global datasets that previously was unseen or inaccessible. This article is protected by copyright. All rights reserved.

Publishing year

2014

Language

English

Pages

862-871

Publication/Series

Proteomics

Volume

14

Issue

7-8

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Medical Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 1615-9861