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Related Experiment Videos

A new, simple, bioassay for human IFN-gamma

W Däubener1, N Wanagat, K Pilz

  • 1Institut für Med. Mikrobiologie und Virologie, Heinrich-Heine-Universität, Düsseldorf, Germany.

Journal of Immunological Methods
|January 12, 1994
PubMed
Summary

This study introduces a simple bioassay to measure Interferon-gamma (IFN-gamma) levels by detecting kynurenine production. This method offers a reliable alternative for quantifying IFN-gamma in biological samples.

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Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Interferon-gamma (IFN-gamma) induces indoleamine 2,3-dioxygenase (IDO), which degrades L-tryptophan into N-formyl-kynurenine.
  • IDO activity varies across cell types, with glioblastoma cell lines like 86HG39 and its clone 2D9 showing higher induced activity compared to Hela and U373MG cells.

Purpose of the Study:

  • To develop and validate a simple bioassay for quantifying IFN-gamma levels.
  • To assess the specificity and sensitivity of the bioassay using various cytokines and cell lines.

Main Methods:

  • Utilized the 2D9 glioblastoma cell line for its high IFN-gamma induced IDO activity.
  • Quantified kynurenine production photometrically using a microplate reader after IFN-gamma stimulation.
  • Tested the specificity of the assay against other cytokines (IFN-alpha, IFN-beta, IL-1, IL-2, IL-6, GM-CSF, TNF-alpha) and validated results against a commercial ELISA kit.

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Main Results:

  • Kynurenine production was directly proportional to IFN-gamma concentration, with a detection limit of 20 U/ml.
  • IFN-gamma was the only cytokine tested that induced significant kynurenine production.
  • A monoclonal antibody against IFN-gamma completely blocked IDO induction, confirming assay specificity.
  • The bioassay demonstrated reproducible results that correlated well with ELISA-based IFN-gamma quantification.

Conclusions:

  • Measurement of IFN-gamma-induced kynurenine production is a valid and simple bioassay for determining IFN-gamma content.
  • This assay can be performed using standard laboratory equipment, offering a practical method for IFN-gamma quantification.