A combinatorial screening of human fibroblast responses on micro-structured surfaces

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Engineering

Background:

• Biomaterial surface topography is crucial for next-generation biomedical implants.
• Establishing clear trends in topographical effects on cellular behavior is challenging due to study variations.

Purpose of the Study:

• To investigate the effect of 169 distinct pillar-based surface topographies on fibroblast proliferation and mechanical response.
• To identify specific topographical features that influence cellular behavior.

Main Methods:

• Utilized a combinatorial screening approach to test numerous surface topographies.
• Systematically altered inter-pillar gap sizes (1-6 μm) on pillar structures.
• Analyzed fibroblast proliferation, cytoskeleton, and focal adhesion morphology.

Main Results:

• Larger inter-pillar gaps (4-6 μm) reduced fibroblast proliferation and caused cell elongation with disrupted actin cytoskeleton.
• Smaller inter-pillar gaps (1-2 μm) supported fibroblast proliferation comparable to non-structured surfaces.
• Observed significant changes in cytoskeleton and focal adhesion morphology correlated with topographical periodicity.

Conclusions:

• Surface topography, specifically inter-pillar gap size, strongly influences fibroblast proliferation and mechanical responses.
• Precise topographical periodicities correlate with cell proliferation, morphology, and focal adhesion.
• This combinatorial approach effectively screens topographical effects for biomaterial development.