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Development of an ELISA for bovine IL-10
L S Kwong1, J C Hope, M L Thom
1Institute for Animal Health, Compton, Near Newbury, Berkshire RG20 7NN, UK.
Insights
Researchers developed a sensitive assay for bovine interleukin-10 (IL-10) to study cattle immune responses. This assay detects natural IL-10 in various blood samples, aiding disease research.
Area of Science:
- Veterinary Immunology
- Molecular Biology
- Assay Development
Background:
- Interleukin-10 (IL-10) plays a crucial role in regulating immune responses.
- Understanding bovine IL-10 is vital for diagnosing and managing cattle diseases.
- Existing methods for detecting bovine IL-10 are limited.
Purpose of the Study:
- To develop a sensitive and reliable assay for quantifying bovine IL-10.
- To facilitate the analysis of immune responses in cattle.
- To advance the understanding of cattle diseases influenced by IL-10.
Main Methods:
- Recombinant bovine IL-10 (rbo IL-10) was expressed and characterized.
- Monoclonal antibodies (mAbs) against rbo IL-10 were generated using ELISA.
- A sensitive luminescent-based ELISA was optimized for detecting native IL-10.
Main Results:
- Monoclonal antibodies were developed that specifically detect rbo IL-10.
- A pair of mAbs was identified that can detect both recombinant and natural bovine IL-10.
- The developed luminescent ELISA successfully detected native IL-10 in supernatants of stimulated bovine peripheral blood mononuclear cells (PBMCs) and blood samples.
Conclusions:
- A sensitive and specific assay for bovine IL-10 has been successfully developed.
- The assay is applicable to various in vitro culture systems, including stimulated PBMCs and blood.
- This assay will be a valuable tool for studying cattle immunology and disease.
Abstract:
The objective of the study was to develop an assay for bovine IL-10 that could be applied to analyses of immune responses and advance understanding of a variety of diseases of cattle. Recombinant bovine IL-10 (rbo IL-10) was transiently expressed in Cos-7 cells and shown to inhibit the synthesis of IFN gamma by bovine cells stimulated with antigen in vitro. Mice were immunised with a plasmid containing a cDNA insert encoding rbo IL-10 and inoculated with rbo IL-10. A number of monoclonal antibodies (mAb) were generated that reacted with rbo IL-10 in an ELISA. Some of these mAb neutralised the ability of rbo IL-10 to inhibit IFN gamma synthesis by antigen-stimulated bovine cells. A pair of mAb was identified that together could be used to detect both recombinant and natural bovine IL-10 present in supernatant of PBMC stimulated with ConA. A luminescent detection method was applied to the ELISA making it more sensitive. Using this method native IL-10 was detected in supernatants of PBMC, diluted blood and undiluted blood from cattle immunised with Mycobacterium bovis BCG or ovalbumin and incubated in vitro with antigen indicating the applicability of the assay to a number of in vitro culture systems.
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