In Situ High-Resolution AFM Imaging and Force Probing of Cell Culture Medium-Forming Nanogranular Surfaces for Cell...

Area of Science:

• Cell Biology
• Biophysics
• Materials Science

Background:

• Cell culture medium is crucial for in vitro cell studies.
• Mechanisms of cell growth regulation in culture media remain incompletely understood.
• Advanced imaging techniques are needed to observe cellular processes in situ.

Purpose of the Study:

• To investigate nanogranular surface formation in cell culture medium.
• To elucidate the role of these surfaces in promoting cell growth.
• To demonstrate the utility of atomic force microscopy (AFM) in studying cell-medium interactions.

Main Methods:

• Atomic force microscopy (AFM) for high-resolution imaging of surfaces in aqueous environments.
• Fluorescent labeling to identify components of the nanogranular surfaces.
• AFM force spectroscopy to probe cell-surface adhesion.
• In vitro cell growth experiments.

Main Results:

• AFM visualized dynamic formation of nanogranular surfaces on glass slides incubated in cell culture medium.
• Fluorescent labeling confirmed the presence of bovine serum proteins within these nanogranular structures.
• Nanogranular surfaces significantly promoted cell attachment and proliferation.

Conclusions:

• Cell culture medium spontaneously forms nanogranular surfaces rich in proteins.
• These nanotopographical features enhance cell adhesion and growth.
• AFM provides unprecedented spatial resolution for studying cell behavior and nanotopography interactions in aqueous conditions.