Related Experiment Videos
Stochastic spreading of intracellular Ca(2+) release
M Falcke1, L Tsimring, H Levine
1Physics Department, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319, USA.
Summary
We studied calcium release dynamics using a model of the inositol 1,4,5-trisphosphate receptor channel. Increasing IP3 concentration shifts release from isolated events to propagating waves, revealing stochastic backfiring.
Area of Science:
- Biophysics
- Cellular signaling
Background:
- Calcium signaling is crucial for cellular processes.
- Inositol 1,4,5-trisphosphate (IP3) receptors mediate calcium release.
- Understanding IP3 receptor dynamics is key to cellular function.
Purpose of the Study:
- To investigate the spreading dynamics of calcium-induced calcium release.
- To analyze the behavior of the stochastic DeYoung-Keizer model for IP3 receptor channels.
- To explore the impact of inositol 1,4,5-trisphosphate (IP3) concentration on calcium release patterns.
Main Methods:
- Utilized the stochastic DeYoung-Keizer model.
- Simulated calcium release events.
- Analyzed the transition from isolated events to propagating waves.
- Employed adiabatic elimination of the partial differential equation for Ca(2+) concentration.
Main Results:
- Observed a transition from isolated calcium release events to steadily propagating waves with increasing IP3 concentration.
- Identified a novel state termed 'stochastic backfiring' during steady wave propagation.
- Demonstrated model reduction to a lattice of stochastic channel clusters.
Conclusions:
- The DeYoung-Keizer model accurately captures calcium release dynamics.
- IP3 concentration is a critical factor in determining calcium release patterns.
- Stochastic backfiring represents a significant dynamic state in IP3 receptor activity.