Evaluation of protein expression in bovine bronchoalveolar fluid following challenge with Mannheimia haemolytica - PubMed (original) (raw)

Comparative Study

. 2011 Sep;11(18):3685-97.

doi: 10.1002/pmic.201000710. Epub 2011 Aug 23.

Affiliations

• PMID: 21800424
• DOI: 10.1002/pmic.201000710

Comparative Study

Evaluation of protein expression in bovine bronchoalveolar fluid following challenge with Mannheimia haemolytica

Jamie L Boehmer et al. Proteomics. 2011 Sep.

Abstract

Proteomics analysis of bovine bronchoalveolar fluid (BAF) following induction of pneumonia with Mannheimia haemolytica using nanoflow liquid chromatography coupled with tandem mass spectrometry (nanoLC-MS/MS) resulted in the identification of 88 unique proteins. Proteins detected in BAF included antimicrobial peptides (AMPs), complement factors, acute-phase proteins, protease inhibitors, and proteins involved in oxidation-reduction. Notwithstanding biological variation, differences in relative protein abundance, determined using normalized peptide counts, were detected for select proteins in BAF from genuinely infected versus sham-infected animals. To demonstrate the applicability of using normalized peptide counts to assess protein expression trends, LC-MS/MS data for the acute-phase protein haptoglobin (HPT) were compared with ELISA data, and statistical evaluation of the relationship between the data revealed a strong measure of association. Differences were detected between sham- and genuinely infected animals for haptoglobin, as well as the AMPs cathelicidin-1 and cathelicidin-4, and inter-α-trypsin inhibitor heavy chain-4, a fairly novel protein involved in the acute phase response. Though the small sample size limited the scope of the inferences, the results indicate the likely importance of AMPs and acute-phase proteins during respiratory infection, and provide additional information regarding potential mechanisms involved in the bovine mucosal barrier defense.

Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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