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NF-κB-dependent Luciferase Activation and Quantification of Gene Expression in Salmonella Infected Tissue Culture Cells
Published on: January 12, 2020
Dual delayed feedback provides sensitivity and robustness to the NF-κB signaling module
Diane M Longo1, Jangir Selimkhanov, Jeffrey D Kearns
1Department of Bioengineering, University of California San Diego, La Jolla, California, United States of America.
Plos Computational Biology
|July 5, 2013
Summary
Cellular signaling uses oscillations, but not for frequency modulation. Computational models show NF-κB feedback loops enable rapid responses and robust signaling, fine-tuning durations and minimizing noise.
Area of Science:
- Cellular signaling and systems biology
- Molecular and systems immunology
- Computational biology and bioinformatics
Background:
- Cellular stress responses often involve dynamic, oscillatory signaling pathways.
- The role of oscillations in signaling codes, such as frequency modulation (FM), remains unclear.
- Negative feedback loops are key regulators of these dynamic cellular behaviors.
Purpose of the Study:
- To investigate the functional role of negative feedback loops in regulating the transcription factor NF-κB dynamics.
- To determine if NF-κB oscillations serve as a frequency modulation (FM) signaling code.
- To explore how feedback mechanisms contribute to response kinetics and robustness.
Main Methods:
- Development and analysis of experimentally calibrated computational models of NF-κB signaling.
- Application of linear stability analysis to understand oscillatory properties.
- Simulation studies to assess response dynamics to transient stimuli and molecular noise.
Main Results:
- NF-κB oscillatory frequency is an intrinsic property of the primary negative feedback loop, independent of stimulus characteristics.
- The dual delayed negative feedback system supports rapid activation and inactivation for transient signals.
- Feedback loops allow for graded fine-tuning of response durations and minimize stochastic fluctuations, enhancing robustness.
Conclusions:
- NF-κB oscillations do not function as a frequency modulation (FM) signaling code.
- The evolved negative feedback architecture optimizes NF-κB signaling for rapid, robust, and finely tuned responses to transient stimuli.
- Dual feedback loops enhance signal fidelity and reliability in the presence of cellular noise.
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