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A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro
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Complementary Cytoskeletal Feedback Loops Control Signal Transduction Excitability and Cell Polarity.

Jonathan Kuhn1, Parijat Banerjee2, Andrew Haye1

  • 1Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, MD.

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Summary
This summary is machine-generated.

Cells integrate chemical and mechanical signals using feedback loops. Cytoskeletal changes control Ras/PI3K signaling, influencing cell polarity and movement in complex environments.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Cells navigate complex environments by integrating chemical and mechanical cues.
  • Signaling networks like Ras and PI3K transmit chemical information, while the cytoskeleton relays mechanical information back.

Approach:

  • Utilized novel synthetic tools to acutely control cytoskeletal elements in Dictyostelium and neutrophils.
  • Investigated feedback mechanisms altering signaling networks and cell membrane/cortex states.

Key Points:

  • Increased branched actin assembly boosts Ras/PI3K activation; reduced polymeric actin decreases it.
  • Reduced myosin II assembly enhances Ras/PI3K activation and chemotactic sensitivity.
  • Inhibiting branched actin blocks Ras/PI3K activation, an effect modulated by filamentous actin and myosin II.
  • Increased actin crosslinking via RacE decreases Ras activation, enabling cell spreading without branched actin nucleation.

Conclusions:

  • Defined positive feedback loops promoting cell front and back states.
  • These loops are crucial for cell polarity and signal integration.
  • Interplay enables cells to navigate complex biological structures.