Show simple item record

dc.contributor.authorBerle, Magnusen_US
dc.contributor.authorKroksveen, Ann Cathrineen_US
dc.contributor.authorGarberg, Hilde Kristinen_US
dc.contributor.authorAarhus, Madsen_US
dc.contributor.authorHaaland, Øysteinen_US
dc.contributor.authorWester, Knuten_US
dc.contributor.authorUlvik, Rune Johanen_US
dc.contributor.authorHelland, Christian Andreen_US
dc.contributor.authorBerven, Frode S.en_US
dc.PublishedFluids and Barriers of the CNS 10(1):17eng
dc.description.abstractBackground: There is little knowledge concerning the content and the mechanisms of filling of arachnoid cysts. The aim of this study was to compare the protein content of arachnoid cysts and cerebrospinal fluid by quantitative proteomics to increase the understanding of arachnoid cysts. Methods: Arachnoid cyst fluid and cerebrospinal fluid from five patients were analyzed by quantitative proteomics in two separate experiments. In a label-free experiment arachnoid cyst fluid and cerebrospinal fluid samples from individual patients were trypsin digested and analyzed by Orbitrap mass spectrometry in a label-free manner followed by data analysis using the Progenesis software. In the second proteomics experiment, a patient sample pooling strategy was followed by MARS-14 immunodepletion of high abundant proteins, trypsin digestion, iTRAQ labelling, and peptide separation by mix-phase chromatography followed by Orbitrap mass spectrometry analysis. The results from these analyzes were compared to previously published mRNA microarray data obtained from arachnoid membranes. Results: We quantified 348 proteins by the label-free individual patient approach and 1425 proteins in the iTRAQ experiment using a pool from five patients of arachnoid cyst fluid and cerebrospinal fluid. This is by far the largest number of arachnoid cyst fluid proteins ever identified, and the first large-scale quantitative comparison between the protein content of arachnoid cyst fluid and cerebrospinal fluid from the same patients at the same time. Consistently in both experiment, we found 22 proteins with significantly increased abundance in arachnoid cysts compared to cerebrospinal fluid and 24 proteins with significantly decreased abundance. We did not observe any molecular weight gradient over the arachnoid cyst membrane. Of the 46 proteins we identified as differentially abundant in our study, 45 were also detected from the mRNA expression level study. None of them were previously reported as differentially expressed. We did not quantify any of the proteins corresponding to gene products from the ten genes previously reported as differentially abundant between arachnoid cysts and control arachnoid membranes. Conclusions: From our experiments, the protein content of arachnoid cyst fluid and cerebrospinal fluid appears to be similar. There were, however, proteins that were significantly differentially abundant between arachnoid cyst fluid and cerebrospinal fluid. This could reflect the possibility that these proteins are affected by the filling mechanism of arachnoid cysts or are shed from the membranes into arachnoid cyst fluid. Our results do not support the proposed filling mechanisms of oncotic pressure or valves.en_US
dc.publisherBioMed Centraleng
dc.relation.ispartof<a href="" target="blank">Characterization of arachnoid cysts using clinical chemistry, qualitative and quantitative proteomics</a>eng
dc.rightsAttribution CC BYeng
dc.titleQuantitative proteomics comparison of arachnoid cyst fluid and cerebrospinal fluid collected perioperatively from arachnoid cyst patientsen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderMagnus Berle et al.; licensee BioMed Central Ltd.
dc.rights.holderCopyright 2013 Berle et al.; licensee BioMed Central Ltd
dc.source.journalFluids and Barriers of the CNS

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution CC BY
Except where otherwise noted, this item's license is described as Attribution CC BY