Insights into the Mechanical Characterization of Mouse Brain Tissue Using Microindentation Testing

Area of Science:

• Biomechanical Engineering
• Neuroscience
• Materials Science

Background:

• Indentation testing is widely used for brain tissue mechanical property quantification.
• Significant variability exists in reported stiffness values, hindering comparability.
• Understanding brain microstructure-stiffness relationships necessitates standardized measurement protocols.

Purpose of the Study:

• To present standardized protocols for brain tissue mechanical property measurement.
• To enable comparability and assess repeatability of indentation testing data.
• To facilitate the study of brain's heterogeneous microstructure and local tissue stiffness.

Main Methods:

• Detailed protocol for preparing 1000-µm thick coronal mouse brain slices.
• Experimental parameters for spherical indentation using the FemtoTools FT-MTA03 Micromechanical Testing System.
• Two distinct methods for deriving elastic modulus from force-displacement data.

Main Results:

• Demonstration of a robust experimental framework for mechanical property determination.
• Successful quantification of spatially heterogeneous microstructural properties in mouse brain tissue.
• Established protocols for consistent and repeatable indentation testing.

Conclusions:

• The presented protocols provide a standardized approach to brain tissue mechanical testing.
• These methods enhance the reliability and comparability of stiffness measurements.
• The framework supports investigations into the relationship between brain microstructure and mechanical properties.