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Fluctuation-driven mechanotransduction regulates mitochondrial-network structure and function.

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Variable mechanical stretch, not monotonous, boosts cellular ATP production and maintains blood vessel function by enhancing mitochondrial activity. This finding highlights a key mechanotransduction pathway crucial for cellular energy and physiological processes.

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Area of Science:

  • Cellular mechanobiology
  • Mitochondrial function
  • Vascular physiology

Background:

  • Cells experience mechanical fluctuations from physiological changes like blood pressure variations.
  • Understanding how cells respond to mechanical stimuli is crucial for cellular energy homeostasis.

Purpose of the Study:

  • To investigate the impact of monotonous versus variable mechanical stretch on cellular ATP production in vascular smooth muscle cells.
  • To elucidate the underlying molecular mechanisms and physiological consequences of stretch-induced ATP regulation.

Main Methods:

  • Assessed ATP production via mitochondrial membrane potential changes in cultured vascular smooth muscle cells.
  • Exposed cells and isolated rat aorta rings to monotonous and variable cyclic stretch conditions.
  • Analyzed the expression and phosphorylation of key mitochondrial proteins and network complexity.

Main Results:

  • Variable stretch significantly enhanced ATP production compared to monotonous stretch in vascular smooth muscle cells.
  • Variable stretch increased the expression of ATP synthase, cytochrome c oxidase, mitofusins, and PGC-1α.
  • Monotonous stretch downregulated vessel-wall contractility, while variable stretch maintained it via mitochondrial ATP production.

Conclusions:

  • Fluctuation-driven mechanotransduction, mediated by motor proteins and cytoskeletal networks, enhances mitochondrial ATP production.
  • Variable mechanical stretch is essential for maintaining cellular energy levels and physiological vascular contractility.
  • These findings have implications for understanding ATP-dependent and mechanosensitive cellular processes.