Mechanical Properties of Inflamed Appendix Tissues

Area of Science:

• Biophysics
• Mechanobiology
• Tissue Engineering

Background:

• Histopathology visualizes cellular morphology but misses tissue mechanical properties.
• Mechanobiology offers new diagnostic markers for diseases like inflammation and cancer.
• Assessing tissue mechanics is vital for understanding physiological and pathological processes.

Purpose of the Study:

• To measure the mechanical properties of appendix biopsy specimens.
• To identify potential mechanomarkers for inflammation in appendix tissues.
• To explore the use of atomic force microscopy and shear rheometry for tissue analysis.

Main Methods:

• Atomic Force Microscope (AFM) used to determine Young's modulus from force-indentation curves.
• Shear rheometer employed to measure rheological properties of macroscopic appendix samples.
• Hertz-Sneddon model applied for elastic modulus calculation.

Main Results:

• Inflamed appendix tissues exhibit significantly lower elasticity (Young's modulus reduced by 67% on average).
• Mechanical properties, including storage modulus, can indicate appendix tissue inflammation.
• Inflamed tissues show distinct responses to axial and shear stresses compared to healthy tissues.

Conclusions:

• Specific mechanical properties of inflamed vermiform appendices can serve as novel mechanomarkers.
• These mechanomarkers may aid in the early detection and monitoring of appendicitis.
• Tissue mechanics offers a promising avenue for diagnosing inflammatory conditions.