Pore Shape Defines Paths of Metastatic Cell Migration

Area of Science:

• Biophysics
• Cancer Biology
• Cellular Mechanics

Background:

• Cancer cell invasion of dense tissues is a complex process influenced by tissue structure and cell properties.
• Existing models often simplify tissue architecture, neglecting the impact of pore geometry on cell migration.
• Understanding these factors is crucial for developing strategies to inhibit cancer metastasis.

Purpose of the Study:

• To investigate how pore shape, independent of pore size, influences cancer cell penetration efficiency.
• To analyze the adaptive path-finding behavior of metastatic cells in complex microenvironments.
• To identify specific pore geometries that facilitate or hinder cancer cell invasion.

Main Methods:

• Fabrication of custom pore microenvironment models using laser nanolithography with controlled pore shapes.
• Migration assays using human breast cells (MCF10A) and their metastatic variants (MCF10CA1a.cl1).
• Observation and analysis of cell behavior and penetration through various pore geometries.

Main Results:

• Pore shape is a significant and independent determinant of cancer cell penetration efficiency, beyond pore cross-section.
• Metastatic cells exhibit adaptive exploratory behavior to identify paths of least resistance.
• Tall and narrow rectangular pores were found to facilitate cancer cell migration in complex architectures.

Conclusions:

• The geometry of the tissue microenvironment, specifically pore shape, plays a critical role in cancer cell invasion and metastasis.
• Metastatic cells possess sophisticated mechanisms to navigate complex architectures by selecting favorable pore shapes.
• This research provides new insights into the physical constraints governing cancer dissemination and suggests potential therapeutic targets.