Antimicrobial Strategies Against Biofilm-Associated Infections

Biofilm-associated infections present a formidable challenge to modern medicine, arising when microbial communities adhere to surfaces and secrete an extracellular polymeric substance that shields cells from immune clearance and antimicrobial agents. These structured assemblies are implicated in a majority of device-related and chronic infections, from indwelling catheters to prosthetic joints. Traditional antibiotics often fail to penetrate the biofilm matrix or target dormant cells within, leading to persistent reservoirs of infection and the emergence of resistance. Contemporary strategies seek to disrupt biofilm architecture, inhibit communication pathways, enhance antimicrobial delivery and harness alternative modalities. Approaches under active investigation include enzymatic degradation of the matrix, blockade of quorum sensing circuits, development of antibiofilm peptides and application of nanomaterials to facilitate drug penetration. Combination therapies pairing conventional antibiotics with biofilm-dispersing agents have shown promise in preclinical studies, while surface engineering of implants with anti-adhesive or antimicrobial coatings offers preventative potential. Emerging biophysical techniques, such as ultrasound and photodynamic therapy, further expand the toolkit for biofilm eradication. Integrating these tactics into clinical practice holds global significance: improving patient outcomes, reducing antimicrobial consumption and curbing the economic burden of refractory infections.

Research from Nature Portfolio

Studies have illuminated molecular targets and small-molecule agents that compromise biofilm integrity in resistant staphylococcal strains. One foundational investigation demonstrated that a natural alkaloid impedes amyloid fibril formation by interfering with phenol-soluble modulins, reducing biofilm density and restoring antibiotic efficacy in methicillin-resistant Staphylococcus aureus. Structural and simulation analyses revealed the compound’s binding mode to key fibril-forming peptides, offering a blueprint for rational drug design. Complementing this, a synthetic chemistry effort delivered a library of halogenated phenazine derivatives capable of both inhibiting planktonic growth and eradicating established biofilms of multidrug-resistant pathogens. These agents display potent activity at micromolar concentrations, minimal cytotoxicity and favourable solubility profiles, underscoring the value of modular small-molecule platforms in tackling persistent infections.

Antimicrobial Strategies Against Biofilm-Associated Infections publication trend

The graph below shows the total number of articles in antimicrobial strategies against biofilm-associated infections across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of microbial cells adhering to a surface and encased in a self-produced matrix of extracellular polymeric substances.

Extracellular polymeric substance (EPS): The complex mixture of polysaccharides, proteins, lipids and nucleic acids that forms the scaffold of a biofilm.

Quorum sensing: A cell–cell communication mechanism by which bacteria regulate gene expression in response to population density.

Minimum biofilm eradication concentration (MBEC): The lowest concentration of an antimicrobial agent required to eradicate a biofilm.

Amyloid fibrils: Protein aggregates that contribute to the structural stability of certain biofilms through highly ordered fibrillar assemblies.

References

1. Baicalein Inhibits Staphylococcus aureus Biofilm Formation and the Quorum Sensing System In Vitro. PLOS ONE (2016).
2. Influence of biofilm growth age, media, antibiotic concentration and exposure time on Staphylococcus aureus and Pseudomonas aeruginosa biofilm removal in vitro. BMC Microbiology (2020).
3. Role of Berberine in the Treatment of Methicillin-Resistant Staphylococcus aureus Infections. Scientific Reports (2016).
4. A Highly Potent Class of Halogenated Phenazine Antibacterial and Biofilm-Eradicating Agents Accessed Through a Modular Wohl-Aue Synthesis. Scientific Reports (2017).
5. Antimicrobial Treatment of Staphylococcus aureus Biofilms. Antibiotics (2023).