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Related Experiment Video

Updated: May 10, 2026

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α
08:26

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α

Published on: June 14, 2018

Improved spectrophotometric human interferon-gamma bioassay.

Felicita Fedelis Jusof1, Loke Tim Khaw, Helen J Ball

  • 1School of Medical Sciences (Pathology) and Bosch Institute, Faculty of Medicine, University of Sydney, NSW 2006, Australia.

Journal of Immunological Methods
|June 5, 2013
PubMed
Summary

This study developed a new, cost-effective spectrophotometric bioassay to measure human interferon gamma (IFNγ) activity. The assay utilizes kynurenine production in endothelial cells as a biomarker for IFNγ bioactivity.

Keywords:
BioassayIndoleamine 2,3-dioxygenase 1 (IDO1)Interferon gamma

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High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

Published on: March 24, 2015

Area of Science:

  • Immunology
  • Biochemistry
  • Cell Biology

Background:

  • Interferon gamma (IFNγ) is a crucial cytokine regulating immune responses.
  • IFNγ induces indoleamine 2,3 dioxygenase-1 (IDO1), a key enzyme in the kynurenine pathway.
  • IDO1 activity, measured by kynurenine production, serves as a biomarker for IFNγ bioactivity.

Purpose of the Study:

  • To develop an improved, cost-efficient spectrophotometric bioassay for human IFNγ (hIFNγ).
  • To establish a reliable method for measuring hIFNγ bioactivity using human brain endothelial cells.

Main Methods:

  • Utilized a human brain endothelial cell line (HBEC 5i).
  • Quantified kynurenine production as an indicator of IDO1 activity induced by hIFNγ.
  • Developed a spectrophotometric detection method for the bioassay.

Main Results:

  • Successfully developed a sensitive and easy-to-perform spectrophotometric bioassay for hIFNγ.
  • The assay leverages kynurenine production as a measure of hIFNγ bioactivity.
  • The new method offers a cost-efficient alternative to existing assays.

Conclusions:

  • The developed spectrophotometric bioassay provides a sensitive, cost-effective, and user-friendly method for measuring hIFNγ bioactivity.
  • This assay can serve as a valuable tool in immunological and biochemical research.
  • The method offers advantages over traditional, more complex, and costly IFNγ assays.