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NFAT and NFkappaB activation in T lymphocytes: a model of differential activation of gene expression

Wayne G Fisher1, Pei-Chi Yang, Ram K Medikonduri

  • 1Eugene McDermott Center for Human Growth and Development, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Annals of Biomedical Engineering
|October 13, 2006
PubMed

Insights

Mathematical models reveal that calcium signaling frequencies regulate T-cell transcription factors Nuclear Factor of Activated T-cells (NFAT) and Nuclear Factor kappa-light-chain-enhancer of activated B cells (NFκB). NFκB activates at lower frequencies than NFAT, crucial for immune responses.

Area of Science:

  • Immunology
  • Computational Biology
  • Biochemistry

Background:

  • T-cell activation involves calcium (Ca2+)-dependent transcription factors, including Nuclear Factor of Activated T-cells (NFAT) and Nuclear Factor kappa-light-chain-enhancer of activated B cells (NFκB).
  • These pathways are critical targets for immunosuppressive drugs used in treating inflammatory and autoimmune diseases.
  • Understanding the dynamics of NFAT and NFκB activation is essential for developing targeted therapies.

Purpose of the Study:

  • To develop and analyze mathematical models simulating the regulation of NFAT and NFκB activation in T lymphocytes.
  • To investigate the impact of varying calcium (Ca2+) oscillation frequencies and concentrations on these transcription factors.
  • To identify key regulatory parameters controlling NFAT and NFκB pathway dynamics.

Main Methods:

  • Development of mathematical models for Ca2+-dependent regulation of NFAT and NFκB.
  • Simulation of pathway activation and deactivation using physiological concentrations of Ca2+, diacylglycerol (DAG), and PKCtheta.
  • Analysis of responses to single and periodic step increases in signaling molecules.
  • Sensitivity analysis to determine critical controlling factors for NFAT and NFκB activation.

Main Results:

  • NFAT activation is inhibited at low Ca2+ oscillation frequencies, requiring sustained calcineurin activity.
  • NFκB activation occurs at lower Ca2+ frequencies than NFAT due to IκB degradation.
  • Efficient NFκB nuclear translocation is dependent on IκB degradation.
  • Sensitivity analysis identified key parameters: NFAT activation is controlled by NFAT:calcineurin complex dynamics and nuclear translocation; NFκB activation is controlled by IκB degradation/resynthesis and nuclear import.

Conclusions:

  • The frequency of Ca2+ oscillations plays a critical role in differentially regulating NFAT and NFκB activation in T cells.
  • Mathematical modeling provides insights into the complex dynamics of immune signaling pathways.
  • Identifying key regulatory parameters offers potential targets for precise modulation of immune responses through drug development.

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