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A sensitive immunochemical assay for biologically active MuIFN-gamma
R C Curry1, P A Kiener, G L Spitalny
1Bristol-Myers Company, Department of Immunology, Preclinical Anticancer Research, Wallingford, CT 06492-7660.
Journal of Immunological Methods
|November 23, 1987
Summary
A new double-sandwich ELISA assay accurately detects mouse gamma interferon (MuIFN-gamma). This sensitive and reproducible method is superior to traditional assays for quantifying biologically active MuIFN-gamma.
Area of Science:
- Immunology
- Biotechnology
Background:
- Mouse gamma interferon (MuIFN-gamma) is a crucial cytokine with diverse biological functions.
- Existing methods for MuIFN-gamma detection, such as antiviral assays, often lack sensitivity and reproducibility.
- Development of a highly sensitive and specific assay is essential for accurate MuIFN-gamma quantification.
Purpose of the Study:
- To establish a sensitive and specific immunochemical assay for the detection of mouse gamma interferon (MuIFN-gamma).
- To compare the performance of the developed assay with conventional methods for MuIFN-gamma measurement.
Main Methods:
- Development of a double-sandwich enzyme-linked immunosorbent assay (ELISA) utilizing a neutralizing monoclonal antibody (MAb) and a polyclonal antibody (PAb).
- Testing the specificity of the ELISA against various cytokines including MuIFN-alpha + beta, recombinant TNF (rTNF), and human gamma interferon (HuIFN-gamma).
- Assessing the sensitivity and reproducibility of the ELISA by detecting varying concentrations of MuIFN-gamma and comparing it to hydrogen peroxide (H2O2) release assays.
Main Results:
- The developed ELISA demonstrated high specificity for both natural and recombinant MuIFN-gamma, with minimal cross-reactivity.
- The assay exhibited significantly higher sensitivity and reproducibility compared to macrophage H2O2 release measurements.
- The ELISA could detect MuIFN-gamma down to 0.03 U/ml, showing 10-100 times greater sensitivity than conventional antiviral assays.
- The assay specifically detected biologically active MuIFN-gamma, as biological activity loss correlated with decreased ELISA titers.
Conclusions:
- A novel double-sandwich ELISA has been successfully established for the detection of mouse gamma interferon (MuIFN-gamma).
- This assay offers superior sensitivity, specificity, and reproducibility compared to existing methods.
- The ELISA is a valuable tool for quantifying biologically active MuIFN-gamma in research settings.