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Updated: Jun 13, 2026

Visualization of IL-22-expressing Lymphocytes Using Reporter Mice
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A rapid bioassay for recombinant interleukin-22.

Fei Xu1, Xiao-Ying Li, Jun-Yao Zhang

  • 1Department of Biochemistry and Molecular Biology, West China School of Preclinical & Forensic Medicine, Sichuan University, Chengdu, P R China.

Journal of Immunoassay & Immunochemistry
|April 15, 2010
PubMed
Summary

Researchers developed a new bioassay to measure the activity of Interleukin-22 (IL-22), a cytokine involved in immune responses. This rapid assay uses a modified human liver cell line to quantify IL-22 bioactivity efficiently.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biotechnology

Background:

  • Interleukin-22 (IL-22) is a cytokine primarily produced by activated T cells.
  • The in vivo biological functions of IL-22 remain largely uncharacterized.
  • Understanding IL-22's role requires reliable methods to assess its bioactivity.

Purpose of the Study:

  • To develop a rapid, simple, and reproducible in vitro cell-based bioassay for measuring recombinant Interleukin-22 (IL-22) bioactivity.
  • To facilitate the study of IL-22's primary biological functions.
  • To establish a quantitative method for IL-22 assessment.

Main Methods:

  • Development of a stable human hepatocyte (HepG2) cell line transfected with a STAT3-responsive luciferase reporter plasmid (pSTAT3-Luc).
  • Stimulation of the engineered cell line with recombinant human IL-22 (rhIL-22) to measure dose-dependent luciferase activity.

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  • Validation of the assay using anti-IL-22 monoclonal antibodies (mAbs) to confirm specificity.

    • Main Results:

    • A stable HepG2-derived clone demonstrated a strong, dose-dependent response to rhIL-22 stimulation.
    • The assay yielded an ED50 value of 17.0 +/- 1.4 ng/mL for rhIL-22.
    • Neutralization with anti-IL-22 mAb completely abolished the observed bioactivity, confirming assay specificity.
    • The entire assay procedure can be completed within a single day.

    Conclusions:

    • A novel, rapid, and reproducible in vitro bioassay for quantifying IL-22 bioactivity has been established.
    • This assay provides a valuable tool for studying IL-22's biological functions and for quality control of recombinant IL-22 preparations.
    • The developed method enables efficient assessment of IL-22's biological activity in vitro.