Staphylococcus aureus: Antimicrobial resistance, quorum sensing, and antibiofilm approaches

Staphylococcus aureus is a clinically important bacterial pathogen causing infections from superficial skin lesions to life-threatening systemic diseases. The emergence of methicillin-resistant S. aureus (MRSA) has compounded the global health burden, particularly in low- and middle-income countries, as its quorum-sensing (QS) mediated mechanisms contribute to its persistence, resistance, and evasion from host immune responses and antimicrobial treatments. Thus, these features compromise the effectiveness of conventional antibiotics, urging the need for alternative therapeutic approaches. To resolve these issues, several non-antibiotic antibiofilm approaches have been developed. Bacteriophages and phage-derived enzymes show promising specificity in lysing bacterial cells and disrupting biofilms. Antimicrobial peptides (AMPs), with their broad-spectrum activity, destabilize bacterial membranes and modulate immune responses. Monoclonal antibodies can neutralize toxins or inhibit adhesion molecules within biofilms. Phytochemicals have demonstrated activity against QS pathways and efflux pumps. Metal ion chelators like deferiprone interfere with iron acquisition, which is essential for biofilm stability. Nanoparticles (NPs), ranging from metallic and polymeric to lipid-based and cyclodextrin-based systems, enhance drug delivery and biofilm penetration. CRISPR-Cas systems provide precise genome editing to target resistance genes and virulence factors. Rhamnolipids disrupt biofilm matrix integrity, while enzymes such as dispersin B degrade extracellular polymeric substances. Photodynamic and laser therapies offer localized disruption of biofilm structures through oxidative stress. Collectively, this review offers a transformative complementary approach to traditional antibiotics, enhancing treatment efficacy while potentially reducing the emergence of resistance. Continued research on delivery systems, safety profiles, and synergistic combinations will be pivotal for their clinical translation against S. aureus infections.