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Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology
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On the Adjacency Matrix of RyR2 Cluster Structures.

Mark A Walker1, Tobias Kohl2, Stephan E Lehnart2,3

  • 1Institute for Computational Medicine, Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America.

Plos Computational Biology
|November 7, 2015
PubMed
Summary
This summary is machine-generated.

The spatial arrangement of ryanodine receptors (RyR2) in cardiac cells influences calcium (Ca2+) spark frequency. The structure of RyR2 clusters predicts spark probability, revealing how function follows structure in heart muscle contraction.

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Cell Biology
  • Biophysics

Background:

  • Cardiac myocytes rely on calcium (Ca2+) influx for excitation-contraction coupling.
  • Ryanodine receptors (RyR2) mediate intracellular Ca2+ release, crucial for muscle contraction.
  • Spontaneous RyR2 openings cause localized Ca2+ sparks, influencing cellular function.

Purpose of the Study:

  • To develop a theoretical framework linking RyR2 cluster structure to Ca2+ spark initiation probability.
  • To investigate how the spatial arrangement of RyR2s impacts the frequency and stability of Ca2+ sparks.
  • To explore functional subdomains within RyR2 clusters based on their structure.

Main Methods:

  • Developed a stochastic contact network model for Ca2+ spark initiation.
  • Utilized super-resolution STED microscopy to obtain realistic RyR2 cluster structures.
  • Applied eigendecomposition to a linearized mean-field model of the RyR2 network.

Main Results:

  • The maximum eigenvalue (λ1) of the RyR2 cluster adjacency matrix predicts spark probability.
  • λ1 defines a stability threshold for Ca2+ spark formation based on RyR2 gating rates.
  • Identified functional subdomains within RyR2 clusters with varying Ca2+ sensitivities.

Conclusions:

  • RyR2 cluster structure dictates Ca2+ spark initiation probability, demonstrating a structure-function relationship.
  • The theoretical model provides insights into cardiac Ca2+ release dynamics.
  • This approach offers a general method to infer function from the structure of transmembrane receptor clusters.