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NF-κB-dependent Signaling Pathway

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
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Quantifying NF-κB Activation by Flow Cytometry of IκBα Degradation.

Praveen Krishna Veerasubramanian^1,2, Bruce A Jacobson^1,2, Fridrik J Karlsson¹

¹Inflammation and Immunology Research Unit, Pfizer, Cambridge, Massachusetts.

Current Protocols

|May 11, 2024

Summary

This study introduces a novel flow cytometry assay to measure inflammation by quantifying IκBα degradation, a marker for Nuclear factor-κB (NF-κB) activation in immune cells. This method offers a robust tool for immunology research.

Keywords:

IκBα degradation NF‐κB pathway flow cytometry immunology inflammatory activation

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Area of Science:

Immunology
Cellular Biology
Molecular Biology

Background:

Nuclear factor-κB (NF-κB) is a key pro-inflammatory transcription factor central to immune responses.
Directly measuring active, nuclear NF-κB via flow cytometry is challenging due to antibody limitations.
Assessing NF-κB activation is critical for understanding inflammatory processes and developing targeted therapies.

Purpose of the Study:

To develop and validate a flow cytometry assay for quantifying NF-κB activation.
To indirectly measure NF-κB activation by assessing the degradation of its inhibitor, IκBα.
To provide a reproducible method for medium-to-high-throughput analysis of NF-κB activity in immune cells.

Main Methods:

A flow cytometry protocol was established to quantify the intracellular levels of IκBα.
The assay measures the decrease in IκBα as an indicator of NF-κB pathway activation.
The protocol was validated using human primary regulatory T cells stimulated with TNFR2 agonists.

Main Results:

The developed flow cytometry assay successfully detected IκBα degradation in response to inflammatory stimuli.
The assay demonstrated utility in human primary regulatory T cells, T cells, and THP-1 cell-derived macrophages.
The protocol provides a reliable method for assessing NF-κB activation across different immune cell types.

Conclusions:

This protocol offers a robust and reproducible method for measuring NF-κB activation via IκBα degradation using flow cytometry.
The assay is adaptable for various immune cells and inflammatory triggers, facilitating broader research applications.
This technique enhances the ability to study inflammatory responses and screen potential immunomodulatory agents.