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Plasma Membrane Proteomes of Differentially Matured Dendritic Cells Identified by LC-MS/MS Combined with ITRAQ Labelling

Overview
Journal J Proteomics
Publisher Elsevier
Specialty Biochemistry
Date 2011 Nov 2
PMID 22040742
Citations 10
Authors
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Abstract

Dendritic cells (DCs) play a pivotal role in polarising Th lymphocyte subsets but it is unclear what molecular events occur when DCs generate Th2-type responses. Here, we analysed plasma membrane-enriched fractions from immature, pro-Th1 and pro-Th2 DCs and used a combination of iTRAQ labelling and LC-MS/MS to quantify changes in the proteomes. Analysis was performed on triplicate biological samples and changes verified by flow cytometry. MHC class II molecules and CD29 were up-regulated in pro-Th1 DCs whilst CD18 and CD44 were up-regulated in pro-Th2 DCs. One of the most down-regulated molecules in pro-Th1 DCs was YM-1 whilst the greatest decrease in pro-Th2 DCs was NAP-22. Other molecules up-regulated in pro-Th2 DC compared to pro-Th1 DCs included some potentially involved in protein folding during antigen processing (clathrin and Rab-7), whilst other non-membrane proteins such as enzymes/transporters related to cell metabolism (malate dehydrogenase, pyruvate kinase, and ATPase Na(+)/K(+)) were also recorded. This suggests that pro-Th2 DCs are more metabolically active while pro-Th1 DCs have a mature 'end state'. Overall, although several molecules were preferentially expressed on pro-Th2 DCs, our proteomics data support the view of a 'limited maturation' of pro-Th2 DCs compared to pro-Th1 DCs.

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