Silver Nanoparticles as an Effective Antimicrobial against Otitis Media Pathogens

Area of Science:

• Nanotechnology
• Microbiology
• Otolaryngology

Background:

• Otitis Media (OM) is a leading cause of antibiotic prescriptions in children.
• Widespread antibiotic use for OM contributes to antimicrobial resistance.
• Novel therapeutic strategies are needed to combat bacterial OM effectively.

Purpose of the Study:

• To develop and evaluate polyvinylpyrrolidone-coated silver nanoparticles (AgNPs-PVP) as a localized treatment for OM.
• To assess the antimicrobial efficacy of AgNPs-PVP against key OM pathogens.
• To create a hydrogel-based delivery system for sustained release of AgNPs-PVP in the auditory bullae.

Main Methods:

• Synthesis and characterization of polyvinylpyrrolidone-coated silver nanoparticles (AgNPs-PVP).
• In vitro testing of AgNPs-PVP against *Streptococcus pneumoniae* and non-typeable *Haemophilus influenzae* (NTHi).
• Development of an 18%(w/v) P407 hydrogel for sustained local delivery of AgNPs-PVP, utilizing reverse thermal gelation.

Main Results:

• AgNPs-PVP demonstrated complete eradication of *S. pneumoniae* at 1.04μg/mL and NTHi at 2.13μg/mL.
• Enhanced efficacy against *S. pneumoniae* was attributed to synergistic interactions between H2O2 production by the bacteria and AgNPs.
• The AgNPs-PVP-P407 hydrogel exhibited rapid gelation in situ and sustained antimicrobial release, eradicating OM pathogens in vitro without cytotoxicity.

Conclusions:

• AgNPs-PVP hydrogel represents a potent, localized treatment for bacterial otitis media.
• This novel hydrogel-based system offers a promising alternative to conventional oral antibiotics, mitigating the risk of antibiotic resistance.
• The localized delivery approach ensures targeted antimicrobial action within the auditory bullae.