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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Atomic Force Microscopy (AFM) Applications in Arrhythmogenic Cardiomyopathy.

Brisa Peña1,2,3, Mostafa Adbel-Hafiz2, Maria Cavasin3,4

  • 1CU-Cardiovascular Institute, University of Colorado Anschutz Medical Campus, 12700 East 19th Ave., Aurora, CO 80045, USA.

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Summary

Atomic force microscopy (AFM) reveals cellular biomechanical changes in arrhythmogenic cardiomyopathy (ACM). This technique assesses cell elasticity, contractility, and fibrosis, offering new insights into this inherited heart muscle disorder.

Keywords:
arrhythmogenic cardiomyopathyatomic force microscopybiomechanicsfibrosistissue stiffness

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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.