Differential Protein Quantitation in Mouse Neuronal Cell Lines using Amine-Reactive Isobaric Tagging Reagents with Tandem Mass Spectrometry

Abstract

The high-throughput identification and accurate quantification of proteins are essential strategies for exploring cellularfunctions and processes in quantitative proteomics. Stable isotope tagging is a key technique in quantitative proteomicresearch, accompanied by automated tandem mass spectrometry. For the differential proteome analysis of mouse neuronal celllines, we used a multiplexed isobaric tagging method, in which a four-plex set of amine-reactive isobaric tags are available forpeptide derivatization. Using the four-plex set of isobaric tag for relative and absolute quantitation (iTRAQ) reagents, we analyzedthe differential proteome in several stroke time pathways (0, 4, and 8 h) after the mouse neuronal cells have been stressed usinga glutamate oxidant. In order to obtain a list of the differentially expressed proteins, we selected those proteins which had apparentlychanged significantly during the stress test. With 95% of the peptides showing only a small variation in quantity before andafter the test, we obtained a list of eight up-regulated and four down-regulated proteins for the stroke time pathways. To validatethe iTRAQ approach, we studied the use of oxidant stresses for mouse neuronal cell samples that have shown differential proteome inseveral stroke time pathways (0, 4, and 8 h). Results suggest that histone H1 might be the key protein in the oxidative injurycaused by glutamate-induced cytotoxicity in HT22 cells.