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MALDI imaging mass spectrometry: Discrimination of pathophysiological regions in traumatized skeletal muscle by characteristic peptide signatures
Author(s) -
Klein Oliver,
Strohschein Kristin,
Nebrich Grit,
Oetjen Janina,
Trede Dennis,
Thiele Herbert,
Alexandrov Theodore,
Giavalisco Patrick,
Duda Georg N.,
von Roth Philipp,
Geissler Sven,
Klose Joachim,
Winkler Tobias
Publication year - 2014
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.201400088
Subject(s) - mass spectrometry , mass spectrometry imaging , skeletal muscle , pathophysiology , proteomics , maldi imaging , chemistry , peptide , computational biology , biology , medicine , biochemistry , matrix assisted laser desorption/ionization , chromatography , pathology , organic chemistry , adsorption , desorption , gene
Due to formation of fibrosis and the loss of contractile muscle tissue, severe muscle injuries often result in insufficient healing marked by a significant reduction of muscle force and motor activity. Our previous studies demonstrated that the local transplantation of mesenchymal stromal cells into an injured skeletal muscle of the rat improves the functional outcome of the healing process. Since, due to the lack of sufficient markers, the accurate discrimination of pathophysiological regions in injured skeletal muscle is inadequate, underlying mechanisms of the beneficial effects of mesenchymal stromal cell transplantation on primary trauma and trauma adjacent muscle area remain elusive. For discrimination of these pathophysiological regions, formalin‐fixed injured skeletal muscle tissue was analyzed by MALDI imaging MS. By using two computational evaluation strategies, a supervised approach (ClinProTools) and unsupervised segmentation (SCiLS Lab), characteristic m / z species could be assigned to primary trauma and trauma adjacent muscle regions. Using “bottom‐up” MS for protein identification and validation of results by immunohistochemistry, we could identify two proteins, skeletal muscle alpha actin and carbonic anhydrase III, which discriminate between the secondary damage on adjacent tissue and the primary traumatized muscle area. Our results underscore the high potential of MALDI imaging MS to describe the spatial characteristics of pathophysiological changes in muscle.