Understanding eukaryotic chemotaxis: a pseudopod-centred view.

Area of Science:

• Cell Biology
• Biophysics
• Biochemistry

Background:

• Current models of eukaryotic cell movement and chemotaxis emphasize external chemoattractant signals initiating new pseudopod formation.
• This signal-centered paradigm, while prevalent, is largely based on specific scenarios, especially steep chemoattractant gradients.

Approach:

• Proposes a pseudopod-centered model for eukaryotic cell motility.
• Reinterprets recent experimental data through the lens of intrinsic pseudopod formation.
• Challenges the prevailing signal-centric view by suggesting chemoattractants modulate rather than initiate pseudopod dynamics.

Key Points:

• Most pseudopods form spontaneously, independent of external chemoattractant signals.
• Chemoattractants primarily bias the internal dynamics and stability of already forming pseudopods.
• This perspective re-frames the understanding of cell movement and directed cell migration.

Conclusions:

• Future research should prioritize investigating the intrinsic mechanics of pseudopod formation and dynamics.
• Shifts the focus from signal processing to the biophysical mechanisms governing cell motility.
• Offers a new framework for understanding chemotaxis and cell locomotion in eukaryotes.