Can common adhesion molecules and microtopography affect cellular elasticity? A combined atomic force microscopy and...

Area of Science:

• Biomaterials Science
• Cell Biology
• Biophysics

Background:

• Cells respond to chemical and topographic environmental cues, crucial for research and therapeutics.
• Adhesion molecules (poly-L-lysine, fibronectin) and engineered topography influence cell behavior.
• The impact of these cues on cellular biomechanics and function is not well understood.

Purpose of the Study:

• To investigate how chemical and topographic cues affect cellular biomechanical properties, specifically elasticity.
• To quantify the influence of poly-L-lysine, fibronectin, and microtopography on cell elasticity and cytoskeleton organization.
• To determine the duration of these effects on cell elasticity.

Main Methods:

• Utilized atomic force microscopy (AFM) to rigorously quantify cellular elasticity.
• Systematically evaluated operational factors (indentation depth/speed) and mathematical models for AFM data fitting.
• Quantified changes in cellular elasticity and cytoskeleton organization in response to different surface cues.

Main Results:

• Cellular elasticity was higher on fibronectin-coated surfaces after 1 day, but this effect diminished over time.
• Cells cultured on microgrooved surfaces exhibited significantly higher elasticity that persisted for at least 3 days.
• Differences in cellular elasticity were observed between surfaces coated with poly-L-lysine, fibronectin, and glass.

Conclusions:

• Engineered topography has a more sustained impact on cellular elasticity than chemical cues.
• Chemical cues may be masked by cell-derived matrix proteins, leading to short-term effects.
• This study provides insights into the long-term effects of engineered environments on cell biomechanics.