Atomic Force Microscopy (AFM) Applications in Arrhythmogenic Cardiomyopathy

Area of Science:

• Cardiovascular Research
• Biophysics
• Cellular Mechanobiology

Background:

• Arrhythmogenic cardiomyopathy (ACM) is an inherited heart muscle disorder.
• Fibrofatty tissue replacement of cardiomyocytes leads to ventricular dysfunction and sudden cardiac death.
• Molecular biomechanics is crucial for understanding ACM pathogenesis.

Purpose of the Study:

• To review the application of Atomic Force Microscopy (AFM) in assessing cardiac biomechanics in ACM.
• To highlight the diverse data obtainable from AFM, including cell elasticity, adhesion, viscoelasticity, and contractility.
• To emphasize AFM's potential for evaluating fibrosis in cardiac tissue.

Main Methods:

• Utilizing Atomic Force Microscopy (AFM) to probe cellular biomechanical properties.
• Analyzing genetically mutated cells to identify cytoskeletal and membrane abnormalities.
• Measuring cell elasticity (Young's modulus), beating force, and frequency.
• Assessing tissue fibrosis using AFM.

Main Results:

• AFM analysis of mutated cells reveals cytoskeleton and cell membrane abnormalities.
• Increased cell stiffness (Young's modulus) is indicative of pathological changes.
• AFM provides complementary data to electrophysiology, including cell beating force and frequency.
• Original data demonstrates AFM's capability in assessing cardiac tissue fibrosis.

Conclusions:

• AFM is a powerful tool for characterizing the biomechanical alterations in arrhythmogenic cardiomyopathy.
• AFM offers insights into cellular dysfunction, contractility defects, and tissue fibrosis in ACM.
• This technique enhances our understanding of ACM mechanobiology and aids in disease assessment.