Differential proteomic analysis reveals increased cathelicidin expression in porcine bronchoalveolar lavage fluid after an Actinobacillus pleuropneumoniae infection.
Accurate definition of respiratory health in pigs is an important problem for swine producers and veterinarians. In an approach to identify potential biomarkers, two-dimensional gel electrophoresis and mass spectrometry on bronchoalveolar lavage fluid (BALF)-derived proteins from pigs experimentally infected with Actinobacillus pleuropneumoniae were performed at different time points post infection. Mock-infected pigs were used as a control. It was shown that the antimicrobial peptides, prophenin-2 and PR-39, and the calcium-binding protein calgranulin C were reproducibly upregulated in BALF of pigs chronically infected with A. pleuropneumoniae. Concentrations of PR-39 were significantly (p<0.05) increased in BALF (median of 4.8 nM) but not in serum (median of 2.5 nM) on day 21 after infection. A Receiver Operating Characteristics (ROC) plot showed that PR-39 in BALF is an accurate and easily accessible marker to detect clinically healthy pigs convalescent from an experimental A. pleuropneumoniae infection. These results imply that PR-39 might have a potential as a general biomarker to determine porcine respiratory health.
Hennig-Pauka
Isabel
I
Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.
Jacobsen
Ilse
I
Blecha
Frank
F
Waldmann
Karl-Heinz
KH
Gerlach
Gerald-Friedrich
GF
D000189:Actinobacillus Infections / Q000175:diagnosis / Q000382:microbiology / Q000662:veterinary*; D016977:Actinobacillus pleuropneumoniae / Q000276:immunology*; D000818:Animals; D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides / Q000032:analysis / Q000378:metabolism*; D015415:Biomarkers / Q000032:analysis; D015153:Blotting, Western / Q000662:veterinary; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry*; D015180:Electrophoresis, Gel, Two-Dimensional / Q000662:veterinary; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005260:Female; D015964:Gene Expression Regulation, Bacterial; D008297:Male; D013058:Mass Spectrometry / Q000662:veterinary; D012372:ROC Curve; D011897:Random Allocation; D013047:Specific Pathogen-Free Organisms; D013552:Swine; D013553:Swine Diseases / Q000175:diagnosis / Q000382:microbiology*; D015854:Up-Regulation; D054804:Cathelicidins
D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D015415:Biomarkers; C072212:PR 39; D054804:Cathelicidins