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Proteins in aqueous humor from cataract patients with and without pseudoexfoliation syndrome.

Journal article
Authors Amelie Botling Taube
Emilia Hardenborg
Magnus Wetterhall
Konstantin Artemenko
Jörg Hanrieder
Marit Andersson
Albert Alm
Jonas Bergquist
Published in European journal of mass spectrometry (Chichester, England)
Volume 18
Issue 6
Pages 531-41
ISSN 1469-0667
Publication year 2012
Published at
Pages 531-41
Language en
Keywords Aged, Aged, 80 and over, Angiotensinogen, analysis, metabolism, Aqueous Humor, chemistry, Cataract, complications, metabolism, Exfoliation Syndrome, complications, metabolism, Female, Humans, Male, Osteopontin, analysis, metabolism, Proteins, analysis, metabolism, Proteomics, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, beta-Crystallins, analysis, metabolism
Subject categories Analytical Chemistry, Ophthalmology

Abstract

The aim of this study was to investigate the protein content in aqueous humor in eyes with and without pseudoexfoliations (PEX) and to evaluate the quantitative proteomics method, isobaric tagging for relative and absolute protein quantification (iTRAQ), in combination with two separation methods followed by matrix-assisted Laser desorption/ionization (MALDI) mass spectrometry and tandem mass spectrometry (MS/MS). During cataract surgery, samples of aqueous humor were collected from 20 eyes with PEX and from 18 control eyes. The relative concentrations of proteins in the pooled samples of ten PEX eyes and eight controls were evaluated after trypsin digestion and Labeling of the peptides with (iTRAQ) reagent. Two separation methods, Liquid chromatography (LC) and capillary electrophoresis (CE) were used, followed by MALDI mass spectrometry and MS/MS. Furthermore, 1D gel electrophoresis was performed on the remaining ten pooled PEX samples and ten control samples. The gel material was separated by nano-liquid chromatography (nano-LC) followed by Linear-ion-trap quadrupole Fourier transformation ion cyclotron resonance (FT-ICR). Fifty four proteins were identified in the LC runs and 24 with CE. The relative concentrations of beta-crystallines B2 and S were raised and those of angiotensinogen and osteopontin Lowered in the PEX sample compared to the control. The trends regarding beta-crystallines B2, angiotensinogen and osteopontin were confirmed by the 1D gel electrophoresis.

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