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Cytoskeletal Remodeling Mimics Endothelial Response to Microgravity.

Laura Locatelli1, Jeanette A M Maier1,2

  • 1Department of Biomedical and Clinical Sciences L. Sacco, Università di Milano, Milan, Italy.

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Cytoskeletal disruption in endothelial cells mimics microgravity effects. This suggests that changes in cell structure may mediate how cells respond to altered gravity, impacting vascular health.

Keywords:
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Area of Science:

  • Cell Biology
  • Vascular Biology
  • Biophysics

Background:

  • Endothelial cells are mechanosensors crucial for vascular integrity.
  • The cytoskeleton plays a key role in sensing mechanical forces and signaling.
  • Microgravity rapidly remodels the endothelial cytoskeleton.

Purpose of the Study:

  • Investigate if disrupting actin polymerization mimics microgravity's effects on endothelial cells.
  • Examine the role of transient receptor potential melastatin 7 (TRPM7) and stress proteins.
  • Compare responses in micro- and macrovascular endothelial cells.

Main Methods:

  • Simulated microgravity exposure.
  • Treatment with cytochalasin D to disrupt actin polymerization.
  • Analysis of TRPM7 expression and stress response modulation.

Main Results:

  • Simulated microgravity downregulates TRPM7 in both micro- and macrovascular cells.
  • Cytochalasin D decreased TRPM7 in macrovascular cells but not microvascular cells.
  • Cytochalasin D treatment mimicked microgravity's impact on stress response.

Conclusions:

  • Cytoskeletal disruption may mediate some of microgravity's effects on endothelial cells.
  • TRPM7 regulation by cytoskeletal changes differs between micro- and macrovascular cells.
  • Actin polymerization is a potential pathway linking mechanical forces to endothelial cell responses.