Microarchitecture of Python regius Scale Surface: A Natural Strategy for Bacterial Adhesion Prevention

TL;DR

The scales of the ball python have microstructures that naturally prevent bacteria from sticking, which could inspire new antibacterial materials.

Contribution

The study identifies a natural microarchitecture in Python regius scales that passively prevents bacterial adhesion and biofilm formation.

Findings

SEM imaging showed reduced bacterial colonization on the spike-bearing dorsal scale surface.

Biofilm assays showed an 88% and 78% reduction in E. coli and S. aureus attachment, respectively, compared to polystyrene.

Chemical effects were ruled out, confirming that topography alone inhibits bacterial adhesion.

Abstract

Microscale surface structures on natural materials can
provide
unique functional properties, inter alia, for biological
defense. Here, we report that the dorsal scales of ball python (Python regius), feature regularly distributed sharp microprotrusions
(spikes) that may serve as a model surface for topography-driven prevention
of bacterial adhesion and biofilm formation. The chemical composition
and microarchitecture of the skin grain and flesh sides were characterized
by Fourier Transform Infrared (FTIR) spectroscopy and scanning electron
microscopy (SEM), confirming a keratin-rich, highly organized outer
surface bearing dense arrays of spikes with micrometer-scale height
and spacing. SEM imaging further corroborated markedly reduced colonization
of the spike-bearing dorsal scale surface. Quantitative biofilm assays
based on standard colony-forming unit (CFU) enumeration were performed
using the newly developed scale-pair model. Relative to the smooth
polystyrene reference, Escherichia coli and Staphylococcus aureus attachment and subsequent biofilm
formation decreased by 88 and 78%, respectively, after 48 h of incubation
in 37 °C. Other cultivation experiments ruled out chemical effects
of any residual antimicrobial substances on the skin on bacterial
growth, demonstrating that the topography alone mediates inhibition.
These findings indicate that P. regius scale microstructures
may function as a passive antimicrobial defense, and could inspire
biomimetic, antibiofilm materials for biomedical and industrial applications.

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