Tuning interfacial patterns of molecular bonds via surface morphology

Area of Science:

• Biophysics
• Cellular Mechanics
• Materials Science

Background:

• Extracellular matrix mechanical properties influence focal adhesion dynamics.
• The impact of contact surface morphology on molecular bond patterning remains unclear.

Purpose of the Study:

• Investigate receptor-ligand bond clustering on curved surfaces.
• Determine the role of surface morphology and bond kinetics in pattern formation.
• Analyze interfacial bond segregation and stress dynamics under varying conditions.

Main Methods:

• Modeling cell-extracellular matrix interactions as opposing elastic bodies.
• Incorporating lateral diffusion and bonding/debonding kinetics of molecular bonds.
• Analyzing phase diagrams of cluster patterns and segregation dynamics.

Main Results:

• Surface morphology and bond kinetics significantly regulate molecular bond cluster patterns.
• Interfacial bond segregation is dependent on loading speed.
• Average interfacial stress is rate-dependent, while rupture stress is rate-independent.

Conclusions:

• Designed surface morphology enables programmable patterning of molecular bond clusters.
• Understanding these principles is crucial for controlling cell-matrix interactions.
• This work provides insights into the fundamental mechanisms governing molecular bond assembly.