Abstract
Cerebrospinal fluid (CSF) is in direct contact with the brain and represents a valuable source of mediators that reflect metabolic processes occurring in the central nervous system (CNS). In this sense, mass spectrometry (MS) methods have proven to be sensitive in quantifying the proteomic profiles of CSF, therefore being able to detect biomarker candidates for neurological disorders. In particular, a key development has been the use of multiplexing technologies to easily identify and quantify complex protein mixtures. This chapter describes a workflow suitable for the analysis of CSF proteome using isobaric labeling coupled to strong cation-exchange chromatography fractionation for its potential use as a biomarker discovery platform. In this case, the isobaric tags for relative and absolute quantitation (iTRAQ) label all proteins in a sample via free amines at the N-terminus and on the side chain of lysine residues. Then, the labeled samples are pooled and chromatographically fractionated. These fractions with the pooled samples are afterward analyzed by tandem mass spectrometry (MS/MS), and proteins are quantified by the relative intensities of the reporter ions in the MS/MS spectra, simultaneously obtaining the amino acid sequence. This method complements the neuroproteomic toolbox to identify new protein biomarkers not only for the early clinical diagnosis and disease staging of CNS-related disorders but also to elucidate the molecular mechanisms related to the pathophysiology of these symptoms.
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Acknowledgements
This work was funded by grants from the Spanish Ministry of Economy and Competitiveness (MINECO) (Ref. SAF2014-59340-R), Department of Economic Development from Government of Navarra (Ref. PC023-PC024, PC025, PC081-82 and PI059), and Obra Social la Caixa to ES. AGM was supported by PEJ-2014-A-61949 (MINECO) and a predoctoral fellowship from Public University of Navarra (UPNA). MLM was supported by a predoctoral fellowship from the Public University of Navarra (UPNA). The Proteomics Unit of Navarrabiomed is a member of Proteored, PRB3-ISCIII and is supported by grant PT17/0019, of the PE I+D+i 2013-2016, funded by ISCIII and ERDF. This project is part of the HUPO Brain Proteome Project and is lined up with the Spanish Initiative on the Human Proteome Project (SpHPP).
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Lachén-Montes, M., González-Morales, A., Fernández-Irigoyen, J., Santamaría, E. (2019). Determination of Cerebrospinal Fluid Proteome Variations by Isobaric Labeling Coupled with Strong Cation-Exchange Chromatography and Tandem Mass Spectrometry. In: Santamaría, E., Fernández-Irigoyen, J. (eds) Cerebrospinal Fluid (CSF) Proteomics. Methods in Molecular Biology, vol 2044. Humana, New York, NY. https://doi.org/10.1007/978-1-4939-9706-0_10
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DOI: https://doi.org/10.1007/978-1-4939-9706-0_10
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