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Stochastic modeling of calcium in 3D geometry.


ABSTRACT: Release of inflammatory mediators by mast cells in type 1 immediate-hypersensitivity allergic reactions relies on antigen-dependent increases in cytosolic calcium. Here, we used a series of electron microscopy images to build a 3D reconstruction representing a slice through a rat tumor mast cell, which then served as a basis for stochastic modeling of inositol-trisphosphate-mediated calcium responses. The stochastic approach was verified by reaction-diffusion modeling within the same geometry. Local proximity of the endoplasmic reticulum to either the plasma membrane or mitochondria is predicted to differentially impact local inositol trisphosphate receptor transport. The explicit consideration of organelle spatial relationships represents an important step toward building a comprehensive, realistic model of cellular calcium dynamics.

SUBMITTER: Mazel T 

PROVIDER: S-EPMC2996128 | biostudies-other | 2009 Mar

REPOSITORIES: biostudies-other

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Stochastic modeling of calcium in 3D geometry.

Mazel Tomás T   Raymond Rebecca R   Raymond-Stintz Mary M   Jett Stephen S   Wilson Bridget S BS  

Biophysical journal 20090301 5


Release of inflammatory mediators by mast cells in type 1 immediate-hypersensitivity allergic reactions relies on antigen-dependent increases in cytosolic calcium. Here, we used a series of electron microscopy images to build a 3D reconstruction representing a slice through a rat tumor mast cell, which then served as a basis for stochastic modeling of inositol-trisphosphate-mediated calcium responses. The stochastic approach was verified by reaction-diffusion modeling within the same geometry. L  ...[more]

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