Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715699
Title: Proteomics in COPD
Author: Stone, Helen Marie
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2017
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Abstract:
In alpha-1-antitrypsin deficiency (A1ATD) there is excess neutrophil elastase activity, resulting in proteolytic destruction of the lung parenchyma. I hypothesised that the peptide fragments of proteins present in the lung might be detectable in plasma by mass spectrometry and that they might be useful biomarkers of disease activity and treatment efficacy. Calcium ionophore, neutrophil elastase and proteinase 3 were added to plasma from patients with A1ATD to create an in vitro model of the destructive processes. MALDI-based peptide profiling of plasma from patients pre and post treatment with intravenous A1AT was undertaken and MS/MS performed to identify differences. Plasma was also depleted of abundant plasma proteins, labelled with isobaric tags and analysed by shotgun proteomics. The readily detectible components of the plasma proteome remained unchanged with intravenous A1AT. Addition of ionophore, elastase and proteinase 3 to patient blood generated predominantly fragments of fibrinogen. In patients treated with intravenous A1AT, fragments of A1AT increased significantly with treatment: - 2 of these were fragments of a short C-terminal segment of the A1AT protein and were also present in healthy subjects. The shotgun experiments did not identify any robust biomarkers and illustrate the challenging nature of plasma proteomics.
Supervisor: Not available Sponsor: Grifols
Qualification Name: Thesis (M.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.715699  DOI: Not available
Keywords: QR180 Immunology ; R Medicine (General)
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