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Human IL-Rbeta chains form IL-2 binding homodimers.

Anne-Hélène Pillet¹, Olivier Juffroy, Virginie Mazard-Pasquier

¹Unité d'Immunogénétique Cellulaire, Département Infection et Epidémiologie, Institut Pasteur, Paris, France.

European Cytokine Network

|February 27, 2008

Summary

Researchers discovered a new form of the interleukin-2 receptor (IL-2R) composed of IL-2Rbeta/beta homodimers. This novel IL-2Rbeta homodimer formation occurs independently of gammac, suggesting a new role in IL-2 signaling.

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Area of Science:

Immunology
Molecular Biology
Cell Signaling

Background:

Two functional interleukin-2 receptor (IL-2R) complexes, IL-2Ralpha/IL-2Rbeta/gammac and IL-2Rbeta/gammac, are known in humans.
The IL-2R plays a critical role in immune responses and T-cell regulation.

Purpose of the Study:

To identify and characterize novel forms of the interleukin-2 receptor.
To investigate the spontaneous assembly of IL-2Rbeta chains in the absence of other receptor components.

Main Methods:

Co-transfection of COS-7 cells with tagged IL-2Rbeta constructs (HA, MYC).
Co-immunoprecipitation to detect protein complex formation.
Förster Resonance Energy Transfer (FRET) imaging on living cells using fluorescently tagged IL-2Rbeta chimeras (ECFP, EYFP).
Binding assays using 125I-labeled IL-2 to quantify receptor affinity.

Main Results:

Spontaneous formation of IL-2Rbeta/IL-2Rbeta homodimers was observed in COS-7 cells, independent of gammac or IL-2.
Co-immunoprecipitation confirmed the assembly of IL-2Rbeta:HA/IL-2Rbeta:MYC complexes.
FRET analysis demonstrated dimer formation at the cell surface of living cells.
IL-2Rbeta homodimers exhibited high affinity (Kd = 1nM) for IL-2, comparable to heterodimers.

Conclusions:

A novel IL-2Rbeta/IL-2Rbeta homodimer receptor form has been identified.
This homodimer can bind IL-2 with high affinity, suggesting a functional role.
IL-2Rbeta homodimers may act as a decoy receptor or participate in IL-2 signaling when gammac is scarce.