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Related Experiment Video

Updated: Jan 27, 2026

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Deterministic Limit of Intracellular Calcium Spikes.

V Voorsluijs1, S Ponce Dawson2, Y De Decker1

  • 1Nonlinear Physical Chemistry Unit and Center for Nonlinear Phenomena and Complex Systems (CENOLI), Université libre de Bruxelles, Boulevard du Triomphe, C.P. 231, B-1050 Brussels, Belgium.

Physical Review Letters
|April 2, 2019
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Summary
This summary is machine-generated.

Global calcium (Ca^{2+}) spikes in nonexcitable cells arise from coupled channel dynamics. This study reconciles stochastic and deterministic models, revealing noise-perturbed oscillations as the origin of these calcium spikes.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Computational modeling

Background:

  • Global calcium (Ca^{2+}) spikes in nonexcitable cells are crucial for various cellular functions.
  • These spikes emerge from the collective behavior of calcium channel clusters coupled by diffusion.
  • Existing models present conflicting stochastic and deterministic approaches, both aligning with experimental data.

Purpose of the Study:

  • To reconcile the seemingly contradictory stochastic and deterministic modeling approaches for calcium (Ca^{2+}) spikes.
  • To investigate the underlying mechanisms generating global Ca^{2+} spikes in nonexcitable cells.

Main Methods:

  • Employed fully stochastic simulations to model calcium (Ca^{2+}) dynamics.
  • Utilized mean-field analyses to complement the stochastic simulations.
  • Developed a phenomenological spike nucleation mechanism.

Main Results:

  • Demonstrated that stochastic and deterministic models can be reconciled.
  • Showed that fully stochastic models generate spike sequences as noise-perturbed oscillations.
  • Identified a phenomenological spike nucleation mechanism as the source of underlying deterministic oscillations.

Conclusions:

  • The collective dynamics of calcium (Ca^{2+}) channels can be accurately described by reconciling stochastic and deterministic models.
  • Global Ca^{2+} spikes represent noise-perturbed oscillations originating from a deterministic nucleation mechanism.
  • This unified modeling approach provides a more comprehensive understanding of Ca^{2+} signaling in nonexcitable cells.