Proteomic analysis and characterisation of human cervico-vaginal fluid proteins |
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Authors: | Di Quinzio Megan K W Oliva Karen Holdsworth Sarah J Ayhan Mustafa Walker Susan P Rice Gregory E Georgiou Harry M Permezel Michael |
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Affiliation: | Department of Obstetrics and Gynaecology, The University of Melbourne, Parkville, Victoria, Australia. algmeg@smartchat.net.au |
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Abstract: | AIM: Cervico-vaginal fluid (CVF) may provide insight into the biochemical pathways of human reproduction and parturition. The aim of this study was to establish a 2-D electrophoretic map of human CVF in healthy, pregnant women at term. METHODS: CVF was collected, concentrated and processed by routine 2-D polyacrylamide gel electrophoresis using pH 4-7-immobilised pH gradient strips and 8-16% gradient polyacrylamide gels. Imaged gels were analysed, yielding more than 400 proteins. A total of 157 proteins were common to all gels with a subgroup of the most abundant proteins being excised and characterised either by MALDI or by electrospray ion-trap mass spectrometry. RESULTS: Twenty-one proteins were successfully identified, yielding 15 different proteins. These included blood transport proteins (albumin and transthyretin); a structural protein (beta-actin); proteins involved in fatty acid metabolism (fatty acid-binding protein and acetyl-CoA-binding protein); a calcium-binding protein (annexin III); an anti-inflammatory cytokine (interleukin-1 receptor antagonist); proteinase inhibitors (alpha-1-antitrypsin, monocyte/neutrophil elastase inhibitor, squamous cell carcinoma antigen-1 and cystatin A); and enzymes involved in oxidative stress defence (thioredoxin, peroxiredoxin 2, glutathione S-transferase P and copper,zinc superoxide dismutase). CONCLUSION: CVF is a complex body fluid consisting of both endogenous and environmental proteins. The putative role of some of these proteins in the human reproductive tract is discussed. |
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Keywords: | cervico-vaginal fluid labour pregnancy proteomics two-dimensional electrophoresis |
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