Intermediate filament reorganization dynamically influences cancer cell alignment and migration

Area of Science:

• Cell biology
• Cancer research
• Biophysics

Background:

• Investigating cancer cell interactions with the extracellular matrix (ECM) is crucial for understanding cancer progression.
• The role of keratin, an intermediate filament, in cancer invasion and metastasis requires further elucidation.
• Cytoskeleton-mediated invasion and metastasis are key areas of cancer research.

Purpose of the Study:

• To investigate the role of keratin organization in pancreatic cancer cell (Panc-1) morphological adaptation and migration.
• To understand how keratin cytoskeleton reorganization influences cancer cell interactions with the extracellular matrix (ECM).
• To explore the combined effects of keratin perturbation and physical ECM signals on cancer cell behavior.

Main Methods:

• Studied Panc-1 invasive pancreatic cancer cells.
• Analyzed keratin phosphorylation and actin inhibition effects on cell area.
• Examined keratin and actin fiber organization in cyclically stretched cells.
• Cultured cells on various substrates (PDMS, nanoscale grates, rigid pillars) to assess keratin's role in morphological adaptation and migration.

Main Results:

• Combined keratin phosphorylation and actin inhibition reduced Panc-1 cell area more than either treatment alone.
• No directional correlation was found between intersecting keratin and actin fibers in stretched cells.
• Keratin cytoskeleton reorganization generally increased Panc-1 cell mobility, leading to faster, more directed migration and orientation in response to stimuli.

Conclusions:

• Keratin cytoskeleton reorganization plays a key role in cancer cell adaptation to physical microenvironmental cues.
• The internal cellular architecture (keratin) and external scaffolding (ECM) are interconnected, influencing cancer cell-ECM interactions.
• Understanding keratin's role is vital for developing strategies targeting cancer cell invasion and metastasis.