Spatial calcium kinetics after a traumatic brain injury | JoVE Visualize

Spatial calcium kinetics after a traumatic brain injury

Aayush Kant^1,2,3, Nikhil V Medhekar¹, Tanmay K Bhandakkar⁴

¹Department of Materials Science and Engineering, Monash University, Clayton, Victoria, 3800, Australia.

Biomechanics and Modeling in Mechanobiology|March 27, 2021

View abstract on PubMed

Summary

This study spatializes a model of intracellular calcium ion concentration changes during traumatic brain injury. The model accurately captures experimental data and reveals that secondary injury locations may differ from primary injury sites.

Area of Science:

Biomedical Engineering
Computational Neuroscience
Mechanobiology

Background:

Intracellular calcium ion ([Formula: see text]) concentration increases rapidly during traumatic brain injury (TBI).
Accurate modeling of [Formula: see text] dynamics is crucial for understanding TBI progression.
Previous models were non-spatial, limiting their ability to capture localized effects.

Purpose of the Study:

To develop a spatial model of intracellular calcium ion ([Formula: see text]) concentration evolution in brain tissue under mechanical stress.
To investigate the influence of dimensionality and material properties on the stress- [Formula: see text] relationship.
To identify critical locations for primary and secondary injury in TBI.

Main Methods:

Spatialization of a non-spatial [Formula: see text] transport model.
Representation of brain tissue as a solid continuum with [Formula: see text] activity at each point.
Progressive increase in geometric realism from 1D to more complex representations.
Analysis of pressure and kinematic impulse effects on [Formula: see text] concentration.

Main Results:

The spatial calcium kinetics model accurately replicates experimental observations of [Formula: see text] concentration changes.
Model captures the influence of load rate, magnitude, and duration on [Formula: see text] dynamics.
Demonstrates that the location of primary injury may not be the most critical for secondary injury development.

Conclusions:

A spatial modeling approach provides a more accurate representation of intracellular calcium ion dynamics in TBI.
Mechanical stress significantly influences [Formula: see text] concentration, with varying effects based on dimensionality and material behavior.
Understanding spatial [Formula: see text] kinetics is essential for predicting TBI severity and identifying key injury sites for therapeutic intervention.