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Rectified directional sensing in long-range cell migration.

Akihiko Nakajima1, Shuji Ishihara2, Daisuke Imoto3

  • 11] Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan [2] Research Center for Complex Systems Biology, University of Tokyo, Tokyo 153-8902, Japan.

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This summary is machine-generated.

Dictyostelium cells suppress directional movement when chemoattractant levels decrease. This directional sensing rectification, crucial for cell migration, occurs within specific wave speeds and is explained by a feedforward circuit model.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Systems biology

Background:

  • Understanding how cells integrate spatial and temporal cues for directed migration is a fundamental challenge.
  • Chemoattractant gradients guide cell movement, but the dynamics of sensing these gradients are complex.
  • Dictyostelium discoideum serves as a model organism for studying chemotaxis.

Purpose of the Study:

  • To investigate the integration of spatial and temporal information in Dictyostelium cell migration.
  • To elucidate the mechanism behind directional sensing in response to dynamic chemoattractant waves.
  • To explore the role of the small GTPase Ras in directional sensing during changing chemoattractant concentrations.

Main Methods:

  • Precise microfluidics to emulate dynamic chemoattractant waves.
  • Observation of Dictyostelium cell behavior and activation of Ras at the leading edge.
  • Mathematical modeling of a feedforward circuit to explain observed phenomena.

Main Results:

  • Directional movement and Ras activation are suppressed when chemoattractant concentration decreases over time ('rectification').
  • This rectification effect is observed within an intermediate range of wave speeds.
  • The phenomenon does not require phosphoinositide-3-kinase or F-actin, and is explained by a feedforward circuit model.

Conclusions:

  • Dictyostelium cells exhibit rectification of directional sensing, favoring movement along wavefronts.
  • This adaptive response, combined with local activation and global inhibition, explains directed cell migration dynamics.
  • The study provides insights into the transient response mechanisms governing cell motility.