Development and validation of a house finch interleukin-1β (HfIL-1β) ELISA system

dc.contributor.authorKim, Sungwonen
dc.contributor.authorPark, Myeongseonen
dc.contributor.authorLeon, Ariel E.en
dc.contributor.authorAdelman, James S.en
dc.contributor.authorHawley, Dana M.en
dc.contributor.authorDalloul, Rami A.en
dc.contributor.departmentAnimal and Poultry Sciencesen
dc.description.abstractBackground A unique clade of the bacterium Mycoplasma gallisepticum (MG), which causes chronic respiratory disease in poultry, has resulted in annual epidemics of conjunctivitis in North American house finches since the 1990s. Currently, few immunological tools have been validated for this songbird species. Interleukin-1β (IL-1β) is a prototypic multifunctional cytokine and can affect almost every cell type during Mycoplasma infection. The overall goal of this study was to develop and validate a direct ELISA assay for house finch IL-1β (HfIL-1β) using a cross-reactive chicken antibody. Methods A direct ELISA approach was used to develop this system using two different coating methods, carbonate and dehydration. In both methods, antigens (recombinant HfIL-1b or house finch plasma) were serially diluted in carbonate-bicarbonate coating buffer and either incubated at 4 °C overnight or at 60 °C on a heating block for 2 hr. To generate the standard curve, rHfIL-1b protein was serially diluted at 0, 3, 6, 9, 12, 15, 18, 21, and 24 ng/mL. Following blocking and washing, anti-chicken IL-1b polyclonal antibody was added, plates were later incubated with detecting antibodies, and reactions developed with tetramethylbenzidine solution. Results A commercially available anti-chicken IL-1β (ChIL-1β) polyclonal antibody (pAb) cross-reacted with house finch plasma IL-1β as well as bacterially expressed recombinant house finch IL-1β (rHfIL-1β) in immunoblotting assays. In a direct ELISA system, rHfIL-1β could not be detected by an anti-ChIL-1β pAb when the antigen was coated with carbonate-bicarbonate buffer at 4°C overnight. However, rHfIL-1β was detected by the anti-ChIL-1β pAb when the antigen was coated using a dehydration method by heat (60°C). Using the developed direct ELISA for HfIL-1β with commercial anti-ChIL-1β pAb, we were able to measure plasma IL-1β levels from house finches. Conclusions Based on high amino acid sequence homology, we hypothesized and demonstrated cross-reactivity of anti-ChIL-1β pAb and HfIL-1β. Then, we developed and validated a direct ELISA system for HfIL-1β using a commercial anti-ChIL-1β pAb by measuring plasma HfIL-1β in house finches.en
dc.description.versionPublished versionen
dc.identifier.citationBMC Veterinary Research. 2017 Aug 30;13(1):276en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.holderThe Author(s)en
dc.titleDevelopment and validation of a house finch interleukin-1β (HfIL-1β) ELISA systemen
dc.title.serialBMC Veterinary Researchen
dc.typeArticle - Refereeden
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
902.76 KB
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
1.5 KB
Item-specific license agreed upon to submission