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A sensitive and versatile cytokine bioassay based on type I interferon signaling in 2fTGH cells
Lennart Zabeau1, José Van der Heyden, Jan Tavernier
1Department of Medical Protein Research, Flanders Institute for Biotechnology, Ghent University, Faculty of Medicine and Health Sciences, Ghent, BE 9000, Belgium.
Insights
Researchers developed a novel bioassay to quantify cytokines using chimeric receptors. This sensitive method measures biologically active cytokines, offering an alternative to ELISA for precise quantification.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Accurate quantification of cytokines is crucial for understanding cellular communication and immune responses.
- Existing methods like ELISA may not always reflect the biological activity of cytokines.
Purpose of the Study:
- To design and validate a sensitive and versatile bioassay for quantifying various cytokines.
- To develop a method that specifically measures biologically active cytokines.
Main Methods:
- Utilized chimeric receptors combining cytokine receptor extracellular domains with the type I interferon receptor intracellular domains.
- Engineered stable 2fTGH cell lines for interferon-type signaling, enabling selection based on cell survival or toxicity.
- Quantified cytokine levels via crystal violet staining, measuring cell viability or toxicity.
Main Results:
- Achieved sensitivity in the picogram per milliliter range for cytokine quantification.
- Demonstrated the assay's ability to measure only biologically active cytokines, unlike ELISA.
- Successfully developed hypersensitive cell lines for type I and II interferons, erythropoietin, interleukin-2, and interleukin-5.
Conclusions:
- The developed bioassay is a sensitive, versatile, and biologically relevant tool for cytokine quantification.
- This method provides a valuable alternative to existing techniques, particularly when assessing functional cytokine activity.
Abstract:
We have designed a sensitive and versatile bioassay for quantification of series of cytokines. The assay makes use of chimeric receptors composed of the extracellular, ligand-binding part of the cognate cytokine receptor and the transmembrane and cytosolic part of the type I interferon receptor. Receptors can be homo- (e.g. erythropoietin), di- (e.g. interleukin-5), or even trimeric (e.g. interleukin-2). Stable expression of these chimeras in the 2fTGH cell line allows an interferon-type signaling, which makes a positive selection in conditioned medium possible or a negative selection using a toxic guanine analog. The cytokine of interest is quantified by the extent of cell survival or cell toxicity respectively, which can be measured by easy and cheap crystal violet staining. This bioassay is sensitive in the lower picogram per milliliter range and, in contrast to ELISA methods, only measures the concentration of biologically active cytokines. Using this approach, hypersensitive 2fTGH cell lines have been developed for type I and II interferons, erythropoietin, interleukin-2, and interleukin-5.
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