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Buffers and oscillations in intracellular Ca2+ dynamics.

Martin Falcke1

  • 1Hahn Meitner Institute, Glienicker Str. 100, 14109 Berlin, Germany. falcke@hmi.de

Biophysical Journal
|January 14, 2003
PubMed
Summary

This study models intracellular calcium release behavior with high buffer concentrations. Slow buffers facilitate larger calcium releases and can induce oscillation-like patterns, mimicking experimental observations.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Cellular Physiology

Background:

  • Intracellular calcium (Ca2+) dynamics are crucial for cellular signaling.
  • Buffer properties significantly influence Ca2+ diffusion and signaling.
  • Previous models often simplify buffer behavior.

Purpose of the Study:

  • To model intracellular Ca2+ release dynamics considering high buffer concentrations.
  • To investigate the impact of buffer speed on Ca2+ release and localization.
  • To explore the conditions leading to oscillatory Ca2+ signaling.

Main Methods:

  • A computational model simulating Ca2+ release from channel clusters.
  • Stochastic representation of channel subunit dynamics based on the DeYoung-Keizer model.
  • Analysis of Ca2+ concentration profiles and release dynamics with varying buffer types.

Main Results:

  • Fast buffers create more localized Ca2+ concentration profiles than slow buffers.
  • Slow buffers enable greater Ca2+ release from the endoplasmic reticulum.
  • High concentrations of slow buffers can induce oscillation-like Ca2+ release patterns, dependent on Ca2+ content.

Conclusions:

  • Buffer characteristics critically affect intracellular Ca2+ signaling.
  • The model successfully reproduces the experimentally observed localization of Ca2+ release by slow buffers.
  • Computational modeling provides insights into buffer-mediated regulation of Ca2+ dynamics and oscillations.

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