Titel
Proteomic profiling identifies markers for inflammation-related tumor–fibroblast interaction
Autor*in
Daniel Drev
Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine 1, Medical University of Vienna
Autor*in
Zeynep N. Erdem
Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine 1, Medical University of Vienna
... show all
Abstract
Background: Cancer associated fibroblasts are activated in the tumor microenvironment and contribute to tumor progression, angiogenesis, extracellular matrix remodeling, and inflammation. Methods: To identify proteins characteristic for fibroblasts in colorectal cancer we used liquid chromatography-tandem mass spectrometry to derive protein abundance from whole-tissue homogenates of human colorectal cancer/normal mucosa pairs. Alterations of protein levels were determined by two-sided t test with greater than threefold difference and an FDR of < 0.05. Public available datasets were used to predict proteins of stromal origin and link protein with mRNA regulation. Immunohistochemistry confirmed the localization of selected proteins. Results: We identified a set of 24 proteins associated with inflammation, matrix organization, TGFβ receptor signaling and angiogenesis mainly originating from the stroma. Most prominent were increased abundance of SerpinB5 in the parenchyme and latent transforming growth factor β-binding protein, thrombospondin-B2, and secreted protein acidic-and-cysteine-rich in the stroma. Extracellular matrix remodeling involved collagens type VIII, XII, XIV, and VI as well as lysyl-oxidase-2. In silico analysis of mRNA levels demonstrated altered expression in the tumor and the adjacent normal tissue as compared to mucosa of healthy individuals indicating that inflammatory activation affected the surrounding tissue. Immunohistochemistry of 26 tumor specimen confirmed upregulation of SerpinB5, thrombospondin B2 and secreted protein acidic-and-cysteine-rich. Conclusions: This study demonstrates the feasibility of detecting tumor- and compartment-specific protein-signatures that are functionally meaningful by proteomic profiling of whole-tissue extracts together with mining of RNA expression datasets. The results provide the basis for further exploration of inflammation-related stromal markers in larger patient cohorts and experimental models.
Stichwort
Inflammation signatureColorectal cancerCancer associated fibroblastsSPARCTHBS2Extracellular matrix organizationProteomic profiling
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:842422
Erschienen in
Titel
Clinical Proteomics
Band
14
Verlag
Springer Nature
Erscheinungsdatum
2017
Zugänglichkeit
Rechteangabe
© The Author(s) 2017

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