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Impact of temperature dependent sampling procedures in proteomics and peptidomics – A characterization of the liver and pancreas post mortem degradome

Author:
  • Birger Schultz
  • Karl Sköld
  • Kim Kultima
  • Celine Fernandez
  • Sofia Waldemarson
  • Mikhail Savitski
  • Marcus Svensson
  • Mats Borén
  • Roberto Stella
  • Per Andrén
  • Roman Zubarev
  • Peter James
Publishing year: 2011
Language: English
Publication/Series: Molecular & Cellular Proteomics
Volume: 10
Issue: 3
Document type: Journal article
Publisher: American Society for Biochemistry and Molecular Biology

Abstract english

Little is known about the nature of post mortem degradation of proteins and peptides on a global level, the so-called degradome. This is especially true for non-neural tissues. Degradome properties in relation to sampling procedures on different tissues are of great importance for the studies of for instance post translational modifications and/or the establishment of clinical biobanks. Here, snap freezing of fresh (< 2 minutes post mortem time) mouse liver and pancreas tissue is compared to rapid heat stabilization with regard to effects on the proteome (using 2D-DIGE) and peptidome (using label free LC-MS). We report a number of proteins and peptides that exhibit heightened degradation sensitivity, for instance superoxide dismutase in liver, and peptidyl-prolyl cis-trans isomerase and insulin C-peptides in pancreas. Tissue sampling based on snap freezing produces a greater amount of degradation products and lower levels of endogenous peptides than rapid heat stabilization. We also demonstrate that solely snap freezing related degradation can be attenuated by subsequent heat stabilization. We conclude that tissue sampling involving a rapid heat stabilization step is preferable to freezing with regard to proteomic and peptidomic sample quality.

Keywords

  • Immunology in the medical area

Other

Published
  • Hypertension and Cardiovascular Disease
  • ISSN: 1535-9484
Peter James
E-mail: peter.james [at] immun.lth.se

Professor

Department of Immunotechnology

+46 46 222 14 96

+46 70 247 79 60

MV406411E1

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