Key Points
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Mass spectrometry imaging (MSI) enables the determination of the relative abundance and spatial distribution of biomolecules in tissue sections without labelling or staining
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Studies of joint samples have demonstrated that MSI can provide complementary information to histology and histochemistry for rheumatic disorders
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MSI has revealed the identity and distribution of several peptides, lipids and chemical elements in cartilage, synovium and bone from patients with rheumatic diseases
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Although MSI is currently mainly used in research, this technology might soon be introduced into clinical practice owing to rapid technological improvements
Abstract
Mass spectrometry imaging (MSI) is used to determine the relative abundance and spatial distribution of biomolecules such as peptides, proteins, lipids and other organic compounds in tissue sections by their molecular masses. This technique provides a sensitive and label-free approach for high-resolution imaging, and is currently used in an increasing number of biomedical applications such as biomarker discovery, tissue classification and drug monitoring. Owing to technological advances in the past 5 years in diverse MSI strategies, this technology is expected to become a standard tool in clinical practice and provides information complementary to that obtained using existing methods. Given that MSI is able to extract mass-spectral signatures from pathological tissue samples, this technique provides a novel platform to study joint-related tissues affected by rheumatic diseases. In rheumatology, MSI has been performed on articular cartilage, synovium and bone to increase the understanding of articular destruction and to characterize diagnostic and prognostic biomarkers for osteoarthritis, rheumatoid arthritis and osteoporosis. In this Review, we provide an overview of MSI technology and of the studies in which joint tissues have been analysed by use of this methodology. This approach might increase knowledge of rheumatic pathologies and ultimately prompt the development of targeted strategies for their management.
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Acknowledgements
The authors thank Berta Cillero-Pastor, Maastricht Multimodal Molecular Imaging Institute (M4I), Maastricht, Netherlands, for kindly providing the MSI images. This work is funded by grants from Fondo Investigación Sanitaria-Spain (PI12/00329, PI14/01707, CIBER-CB06/01/0040, RETIC-RIER-RD12/0009/0018). B.R. is funded by Xunta de Galicia (IN606B-2016/004), and C.R.R. by the Miguel Servet II program from Fondo Investigación Sanitaria-Spain (CPII15/0013). The Proteomics Unit belongs to ProteoRed, PRB2-ISCIII, supported by grant PT13/0001.
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Rocha, B., Ruiz-Romero, C. & Blanco, F. Mass spectrometry imaging: a novel technology in rheumatology. Nat Rev Rheumatol 13, 52–63 (2017). https://doi.org/10.1038/nrrheum.2016.184
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DOI: https://doi.org/10.1038/nrrheum.2016.184
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