High-Throughput Biofilm Assay to Investigate Bacterial Interactions with Surface Topographies

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Microbiology

Background:

• Biomaterial surface topography influences cell interactions and medical implant safety.
• Textured surfaces on implants, like those in breast implants, are linked to complications such as breast implant-associated anaplastic large cell lymphoma (BIA-ALCL).
• Bacterial biofilm formation on implant surfaces is a suspected contributing factor to BIA-ALCL.

Purpose of the Study:

• To develop a high-throughput screening method to evaluate bacterial adhesion on diverse biomaterial topographies.
• To identify specific topographic features that promote or inhibit bacterial adhesion.
• To guide the rational design of safer medical implants with reduced bacterial colonization.

Main Methods:

• Development of a high-throughput microplate biofilm assay.
• Screening of polydimethylsiloxane (PDMS) textures with varied feature sizes and spacing.
• Analysis of bacterial adhesion patterns using real-time confocal fluorescence microscopy for selected outlier patterns.

Main Results:

• Surface area alone is not a reliable indicator of bacterial adhesion.
• The size and spacing of topographic features significantly impact bacterial adhesion.
• Identified specific PDMS texture parameters that correlate with increased bacterial adhesion.

Conclusions:

• The developed high-throughput assay effectively screens bacterial adhesion to biomaterial topographies.
• Surface feature size and spacing are critical design parameters for antifouling biomaterials.
• This assay facilitates the development of medical implants with reduced risk of bacterial colonization and associated complications.