Human Corneal Fibroblast Pattern Evolution and Matrix Synthesis on Mechanically Biased Substrates

Area of Science:

• Biomedical Engineering
• Cell Biology
• Tissue Engineering

Background:

• Corneal stromal development involves fibroblast behavior and extracellular matrix (ECM) organization.
• Understanding the role of mechanical forces, or physiological tension, in this process is critical for regenerative medicine and disease modeling.

Purpose of the Study:

• To investigate how physiological tension influences fibroblast patterning dynamics and extracellular matrix (ECM) orientation during corneal stromal development.
• To compare the effects of mechanically biased, loaded, dense, disorganized collagen substrate (LDDCS), glass coverslips, and unloaded, dense, disorganized collagen substrate (UDDCS) on cell behavior.

Main Methods:

• Utilized a fibroblast colony model of corneal stromal development.
• Employed long-term live-cell microscopy within an optically accessible mechanobioreactor.
• Cultured primary human corneal fibroblasts on LDDCS, glass, and UDDCS.

Main Results:

• On LDDCS, fibroblasts exhibited early orientation and migration along a preferred angle, with long-range correlation and stable colony patterns.
• Glass substrates showed poorly correlated fibroblast orientation, slower pattern development, and metastable colony patterns.
• UDDCS resulted in shorter-range cell orientation correlations compared to LDDCS, with ECM patterns consistently reflecting cell patterns across all substrates.

Conclusions:

• Mechanically biasing collagen substrates significantly alters individual cell migration behavior during early development.
• This mechanical influence leads to stable, emergent cell patterning that dictates the template for subsequent ECM synthesis.
• Findings highlight the critical role of mechanical cues in directing tissue development and ECM organization in the corneal stroma.