Fibrotic substrate stiffness enhances endometriotic epithelial cell motility

Area of Science:

• Biomedical Engineering
• Cell Biology
• Pathology

Background:

• Fibrosis, characterized by increased matrix stiffness, is common in inflammatory diseases.
• Substrate stiffness affects cancer and stromal cell migration, but its impact on benign epithelial cells is less understood.
• Pelvic cavity epithelial cell motility in fibrotic conditions requires further investigation.

Purpose of the Study:

• To investigate the effect of substrate stiffness on benign endometriotic epithelial cell migration.
• To model mechanically driven single-cell and multicellular migration using tunable stiffness hydrogels.
• To elucidate the biomechanical regulation of epithelial cell motility in fibrotic states.

Main Methods:

• Utilized an endometriotic epithelial cell line cultured on polyacrylamide hydrogels with varying stiffness.
• Employed glass as a reference for extreme stiffness.
• Analyzed cell speed, actin stress fiber formation, focal adhesion dynamics, and spheroid expansion.

Main Results:

• Stiff substrates significantly promoted cell speed, actin stress fiber formation, focal adhesion presentation, and spheroid expansion compared to soft substrates.
• Increased cellular contractility on soft substrates enhanced cell speed.
• Decreased cellular contractility on stiff substrates reduced cell speed.

Conclusions:

• Matrix stiffness, a key feature of fibrosis, mechanistically regulates benign epithelial cell migration.
• Findings offer insights into the pathogenesis of benign invasive conditions like endometriosis.
• Biomechanical properties of the fibrotic microenvironment play a crucial role in epithelial cell behavior.