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A cell-based assay for IkappaBalpha stabilization using a two-color dual luciferase-based sensor.

R Eric Davis¹, Ya-Qin Zhang, Noel Southall

¹Metabolism Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892-3370, USA.

Assay and Drug Development Technologies

|March 16, 2007

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A novel cell-sensor assay was developed to identify compounds that stabilize IkappaBalpha, a key regulator of nuclear factor kappaB (NFkappaB) signaling. This assay successfully screened thousands of compounds, revealing new inhibitors of NFkappaB pathway activation.

Area of Science:

Biochemistry
Cell Biology
Pharmacology

Background:

The nuclear factor kappaB (NFkappaB) signaling pathway is crucial in cellular processes and disease, often dysregulated in cancers like diffuse large B-cell lymphoma.
High constitutive activity of IkappaB kinase (IKK) leads to IkappaBalpha degradation and NFkappaB activation, driving oncogenesis.

Purpose of the Study:

To develop and validate a novel cell-sensor assay for identifying stabilizers of IkappaBalpha.
To screen a large library of bioactive compounds for potential NFkappaB signaling inhibitors using the developed assay.

Main Methods:

Development of a dual-luciferase reporter system in OCI-Ly3 cells, fusing IkappaBalpha to green luciferase (IkappaBalpha-CBG68) and using red luciferase (CBR) as a control.
Optimization of the assay using an inducible promoter system and miniaturization to a 1,536-well plate format.

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Screening of 2,677 bioactive compounds using concentration-response curves to identify specific IkappaBalpha stabilizers.

Main Results:

The cell-sensor assay demonstrated robust performance with a Z' factor of 0.6.
The assay successfully identified known and novel inhibitors of NFkappaB signaling by detecting compounds that stabilize IkappaBalpha.
Specific stabilizers, including IKK and proteasome inhibitors, were identified by their ability to increase IkappaBalpha-CBG68 signal without affecting the CBR control signal.

Conclusions:

The developed cell-sensor assay is a sensitive and efficient tool for discovering NFkappaB signaling modulators.
This assay facilitates the identification of therapeutic agents targeting IkappaBalpha stabilization for diseases involving NFkappaB dysregulation.
The study highlights the utility of reporter-based assays in drug discovery for complex signaling pathways.