Nanotopographical Surfaces for Regulating Cellular Mechanical Behaviors Investigated by Atomic Force Microscopy

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Science

Background:

• Cell-substrate interactions are crucial for cellular functions, yet the nanoscale mechanisms remain unclear.
• Atomic force microscopy (AFM) offers high-resolution characterization of biological and biomaterial interfaces.

Purpose of the Study:

• To investigate how nanotopographical surfaces regulate cellular behaviors.
• To understand the physical mechanisms governing cell-substrate interactions at the nanoscale.

Main Methods:

• Utilized atomic force microscopy (AFM) to image decellularized and chemically fixed substrates.
• Employed AFM time-lapse imaging to observe dynamic changes during cell culture.
• Quantitatively measured surface roughness, adhesion force, Young's modulus, and relaxation time.

Main Results:

• Identified nanogranular substances on decellularized substrates and cell membrane patches.
• Observed nanogranular depositions from cell culture medium promoting cell growth on substrates.
• Quantified dynamic alterations in substrate and cell physical properties during cell growth.

Conclusions:

• Nanotopographical features and medium depositions significantly influence cell-substrate interactions.
• AFM provides critical insights into the dynamic physical changes governing cellular behaviors at interfaces.
• Findings advance the understanding of physical sciences of biomaterials and cellular regulation.