Modeling actin-microtubule crosstalk in migrating cells

Area of Science:

• Cell Biology
• Biophysics
• Computational Biology

Background:

• Actin-microtubule crosstalk is crucial for cell migration, affecting polarity and morphology.
• Microtubule dynamics, specifically polymerization and depolymerization, influence actomyosin activity.
• Existing models lack a unified framework to explain diverse experimental observations.

Purpose of the Study:

• To develop a computational whole-cell model of actin-microtubule interactions in migrating cells.
• To investigate how mechanical and chemical signaling between microtubules and the cell boundary drives cell behavior.
• To explain emergent dynamic behaviors, including cell morphology and migration patterns.

Main Methods:

• Developed a computational whole-cell model incorporating dynamic microtubules and an active cell boundary.
• Simulated mechanical and chemical interactions between microtubule tips and the cell boundary.
• Analyzed emergent behaviors such as microtubule-organizing center repositioning and migration patterns in various environments.

Main Results:

• The model reproduces self-organized behaviors, including microtubule-organizing center repositioning and diverse migration patterns.
• Local microtubule growth/shrinkage signals induce local boundary contraction/expansion, respectively.
• Microtubule length and number significantly impact cell morphology and migration dynamics.
• The model successfully simulates cell responses to obstacles and microfluidic environments.

Conclusions:

• Actin-microtubule crosstalk, modeled computationally, provides a unified explanation for diverse cell migration phenomena.
• Microtubule dynamics are key regulators of cell polarity, morphology, and migration strategies.
• The model highlights the need for further experimental validation of microtubule's role in cell migration.