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Solid phase IL-2-IL-2R alpha assay with time resolved fluorometry

K Stenroos¹, P Hurskainen, K Blomberg

¹Abo Akademi University, Department of Biochemistry and Pharmacy, Turku, Finland.

Immunology Letters

|June 1, 1997

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This study introduces a new time-resolved fluorometric assay for measuring soluble human interleukin-2 receptor alpha (hIL-2R alpha). The assay is a simple, nonradioactive method suitable for high-throughput screening.

Area of Science:

Biochemistry
Immunology
Assay Development

Background:

The interleukin-2 receptor alpha (IL-2R alpha) is a key component in immune regulation.
Accurate measurement of soluble IL-2R alpha is crucial for understanding various biological processes and diseases.
Existing methods for soluble IL-2R alpha detection may be complex or utilize radioactivity.

Purpose of the Study:

To develop and validate a novel, nonradioactive, time-resolved fluorometric assay for quantifying soluble human IL-2R alpha (hIL-2R alpha).
To assess the suitability of this assay for high-throughput screening (HTS) applications.

Main Methods:

A solid-phase assay utilizing monoclonal antibodies (mAb) against hIL-2R alpha immobilized on well plates.
Employing europium-labeled human interleukin-2 (Eu-IL-2) to bind with soluble hIL-2R alpha.

Related Experiment Videos

Dissociation of bound europium into an enhancer solution for time-resolved fluorescence measurement.

Main Results:

The assay successfully detected and quantified soluble hIL-2R alpha.
The calculated dissociation constant (Kd) value aligned with previously reported data for the low-affinity IL-2 receptor.
The assay format demonstrated efficient separation of bound and unbound ligand.

Conclusions:

The developed time-resolved fluorometric assay is a simple, nonradioactive, and effective method for measuring soluble hIL-2R alpha.
This assay is well-suited for high-throughput screening, offering a convenient alternative to existing methods.