Compression-dependent microtubule reinforcement enables cells to navigate confined environments

Area of Science:

• Cell Biology
• Biophysics
• Mechanobiology

Background:

• Cell migration in 3D environments involves physical challenges like compression.
• Cells require coordinated cortical contractility to navigate and squeeze the nucleus through constrictions.
• Microtubules play roles in resisting compression and regulating actomyosin contractility.

Purpose of the Study:

• To investigate the integration of microtubule functions in nuclear transmigration through 3D environments.
• To elucidate the mechanism by which cells withstand and adapt to compressive forces during migration.

Main Methods:

• Investigated microtubule dynamics and protein recruitment under mechanical stress.
• Utilized advanced microscopy to observe cellular responses to compression.
• Examined the role of cytoplasmic linker-associated proteins in microtubule reinforcement.

Main Results:

• Compression triggers reinforcement of a microtubule structure behind the nucleus via mechanoresponsive protein recruitment.
• This reinforced microtubule structure, termed the
• mechanostat
• acts as a feedback mechanism.
• The mechanostat facilitates nuclear positioning, organizes contractility, and enables passage through constrictions.

Conclusions:

• Microtubules function as cellular sensors, detecting and responding to compressive forces.
• The microtubule mechanostat is crucial for cell survival and migration in mechanically demanding environments.
• Disruption of the mechanostat leads to migration failure and cell rupture.