Cited by 16stochastic dynamics and bifurcationCellular transport and secretionDiffusion and Search Dynamics

Hybrid Markov-mass action law model for cell activation by rare binding events: Application to calcium induced vesicular release at neuronal synapses

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Guerrier, Claire, Holcman, David·2016·Scientific Reports

Abstract

Binding of molecules, ions or proteins to small target sites is a generic step of cell activation. This process relies on rare stochastic events where a particle located in a large bulk has to find small and often hidden targets. We present here a hybrid discrete-continuum model that takes into account a stochastic regime governed by rare events and a continuous regime in the bulk. The rare discrete binding events are modeled by a Markov chain for the encounter of small targets by few Brownian particles, for which the arrival time is Poissonian. The large ensemble of particles is described by mass action laws. We use this novel model to predict the time distribution of vesicular release at neuronal synapses. Vesicular release is triggered by the binding of few calcium ions that can originate either from the synaptic bulk or from the entry through calcium channels. We report here that the distribution of release time is bimodal although it is triggered by a single fast action potential. While the first peak follows a stimulation, the second corresponds to the random arrival over much longer time of ions located in the synaptic terminal to small binding vesicular targets. To conclude, the present multiscale stochastic modeling approach allows studying cellular events based on integrating discrete molecular events over several time scales.

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  1. Hille B. Ion channels of excitable membranes, Third Edition (Sinauer Sunderland, MA, 2001).

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Authors
Guerrier, C., & Holcman, D.
Affiliations
  • École Normale Supérieure - PSL (FR)
  • University of Cambridge (GB)
Corresponding author
Holcman, David
Venue
Scientific Reports
Published
2016-10-18
Volume
6
Issue
1
Pages
35506-35506
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2539404277
Cited by
16
References
34
Citations by year
2026: 2 · 2023: 1 · 2022: 3 · 2021: 1 · 2019: 3 · 2018: 3 · 2017: 3
FWCI
1.70
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Topics
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › stochastic dynamics and bifurcation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Diffusion and Search Dynamics
Keywords
Brownian particles, synaptic vesicle release, synapses, calcium channels, cell activation
MeSH terms
Calcium, Computer Simulation, Markov Chains, Models, Neurological, Neurons, Synaptic Vesicles, Time Factors, Presynaptic Terminals, Biophysical Phenomena

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