Compression instrument for tissue experiments (cite) at the meso-scale: device validation - biomed 2011

Area of Science:

• Biomedical Engineering
• Cell Biology
• Materials Science

Background:

• Liver sinusoidal endothelial cells (LSECs) are crucial for liver function, interacting with hepatocytes via the space of Disse extracellular matrix.
• Understanding the mechanical properties of this matrix is vital for developing bioengineered liver constructs.

Purpose of the Study:

• To develop and validate a meso-scale device for characterizing the mechanical properties of the space of Disse matrix.
• To enable novel matrix characterization for improved liver tissue engineering.

Main Methods:

• A custom device was designed using a glass micro-spherical indentor on a fiber optic cantilever.
• A 3-axis translation stage and laser-based position detector were employed for precise deformation and measurement.
• The device quantifies micro-Newton and nano-Newton stress-strain behavior.

Main Results:

• The device was validated using silicon rubber samples (EcoFlex030 and EcoFlex010).
• Experimentally determined Young's moduli for the silicon rubber samples closely matched prior macroscopic compression test results.
• The device successfully quantified mechanical properties at the meso-scale.

Conclusions:

• The developed device is effective for characterizing the mechanical properties of extracellular matrices at the meso-scale.
• This technology can provide critical insights into liver tissue mechanics.
• Further application of this device will aid in the advancement of liver tissue engineering.