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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
The heterodimer of NF-κB...

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NF-κB-dependent Luciferase Activation and Quantification of Gene Expression in Salmonella Infected Tissue Culture Cells

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Observing single cell NF-κB dynamics under stimulant concentration gradient.

Yousef Awwad¹, Tao Geng, Albert S Baldwin

¹School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, Virginia 24061, USA.

Analytical Chemistry

|January 24, 2012

Summary

This summary is machine-generated.

This study introduces a microfluidic device for analyzing cell signaling dynamics. It reveals that NF-κB translocation response time is constant across varying interleukin-1β concentrations.

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Area of Science:

Cellular Biology
Biophysics
Microfluidics

Background:

Studying cell signaling requires examining cellular dynamics under varied stimulant concentrations.
Traditional methods using discrete concentrations are complex, labor-intensive, and risk missing key results.

Purpose of the Study:

To investigate NF-κB activation and translocation at the single-cell level.
To develop and utilize a microfluidic device generating continuous concentration gradients for stimulant variation.

Main Methods:

Employed a microfluidic device to create a continuously varying concentration gradient of interleukin-1β.
Covered four orders of magnitude of stimulant concentrations (0.001-10 ng/mL) with only three device settings.
Utilized real-time imaging for studying temporal dynamics of NF-κB in single cells.

Main Results:

Observed NF-κB translocation at the single-cell level under continuously varying stimulant concentrations.
Found that the percentage of cells exhibiting NF-κB translocation decreased at lower concentrations (0.1-0.001 ng/mL).
Demonstrated that the response time for NF-κB translocation remained constant across the tested concentration range.

Conclusions:

The developed microfluidic device enables efficient study of single-cell signaling dynamics.
Continuous concentration gradients offer advantages over discrete methods for exploring cellular responses.
NF-κB translocation exhibits a consistent temporal response despite variations in interleukin-1β concentration.