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Updated: Dec 29, 2025

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Microtubules regulate cardiomyocyte transversal Young's modulus.

Pamela Swiatlowska1, Jose L Sanchez-Alonso1, Peter T Wright1

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Microtubules regulate heart cell mechanics, impacting Young

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Area of Science:

  • Cardiovascular mechanobiology
  • Cellular mechanics
  • Cardiac physiology

Background:

  • Cardiomyocyte mechanobiology is crucial for heart function.
  • Titin is a known contributor to cardiomyocyte Young's modulus (YM).
  • The role of microtubules (MTs) in cardiac mechanics, especially in myocardial infarction (MI), is understudied.

Purpose of the Study:

  • To investigate the contribution of microtubules (MTs) to cardiomyocyte transverse Young's modulus (YM).
  • To examine MTs' role in cardiac mechanics under varying mechanical loading and in pathological states like myocardial infarction (MI).
  • To understand the impact of MT posttranslational modifications on cardiomyocyte YM.

Main Methods:

  • Nanoscale mechanoscanning ion conductance microscopy was employed.
  • Cardiomyocytes were analyzed in healthy and pathological states.
  • Mechanical loading and unloading conditions were applied.

Main Results:

  • MTs significantly contribute to cardiomyocyte transverse YM in both healthy and pathological conditions.
  • MT posttranslational modifications differentially affect cardiomyocyte YM: acetylation increases flexibility, while detyrosination increases rigidity.
  • No correlation was found between total acetylated and detyrosinated MT protein levels.
  • In polymerized MT populations, increased acetylation correlated with decreased detyrosination in an MI model.

Conclusions:

  • Microtubules are key regulators of cardiomyocyte mechanical properties.
  • Specific MT posttranslational modifications (acetylation and detyrosination) modulate cardiac cell stiffness.
  • These findings offer new insights into cardiac mechanics in health and disease, particularly MI.