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  • 11Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

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Mechanical stretch in heart cells activates mechano-chemo transduction, a process involving nitric oxide synthase (NOS) and Ca(2+)/calmodulin-dependent kinase II (CaMKII). This pathway is crucial for heart function and disease development.

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Area of Science:

  • Cardiology
  • Cellular Biology
  • Biochemistry

Background:

  • Mechanical stretch in the heart activates reactive oxygen/nitrogen species targeting Ca(2+)-signaling proteins.
  • This mechano-chemo transduction pathway regulates calcium release in healthy hearts but contributes to disease when dysregulated.

Purpose of the Study:

  • To investigate the viscosity-dependent mechano-chemo transduction in healthy heart cells.
  • To elucidate the roles of nitric oxide synthase (NOS), NADPH oxidase 2 (Nox2), and Ca(2+)/calmodulin-dependent kinase II (CaMKII) in this process.
  • To differentiate the roles of neuronal NOS (nNOS) and endothelial NOS (eNOS) in mechano-chemo transduction.

Main Methods:

  • Utilized a "cell-in-gel" method to study heart cell contractions.
  • Employed super-resolution microscopy to localize nNOS.
  • Examined signaling pathways in a disease model.

Main Results:

  • Contractions in healthy heart cells induced a steep, viscosity-dependent increase in mechano-chemo transduction.
  • Neuronal NOS (nNOS) played a more significant role than endothelial NOS (eNOS).
  • nNOS was localized nearest to Ca(2+) release sites.
  • In a disease model, nNOS and CaMKII signaling were enhanced, independent of Nox2.

Conclusions:

  • Mechano-chemo transduction is a critical, viscosity-dependent process in heart cells.
  • nNOS and CaMKII are key mediators, with nNOS localized near Ca(2+) release sites.
  • Dysregulation of nNOS and CaMKII signaling contributes to cardiac disease.