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Nanoparticles as antibiotic-delivery vehicles (ADVs) overcome resistance by MRSA and other MDR bacterial pathogens:

Amjed Alabresm1, Yung Pin Chen2, Savannah Wichter-Chandler2

  • 1Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC, United States; Center for Environmental Nanoscience and Risk (CENR), University of South Carolina, Columbia, SC, United States; Department of Biological Development of Shatt Al-Arab & N. Arabian Gulf, Marine Science Centre, University of Basrah, Basrah, Iraq.

Journal of Global Antimicrobial Resistance
|July 13, 2020
PubMed
Abstract

Insights

Linking penicillin G (PenG) to nanoparticles (NPs) significantly enhanced its killing efficiency against resistant bacteria like MRSA. This nanoparticle delivery system offers a promising strategy for combating antibiotic-resistant infections.

Area of Science:

  • Nanotechnology
  • Microbiology
  • Pharmacology

Background:

  • Antibiotic resistance is a growing global health threat.
  • Conventional antibiotics often struggle against multidrug-resistant (MDR) bacterial strains.
  • Developing novel drug delivery systems is crucial for enhancing antimicrobial efficacy.

Purpose of the Study:

  • To investigate the enhanced antimicrobial activity of penicillin G (PenG) when conjugated to nanoparticles (NPs).
  • To evaluate the efficacy of PenG-NP complexes against various pathogenic bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and MDR strains.

Main Methods:

  • Penicillin G was loaded onto fluorescent polystyrene nanoparticles (20nm) functionalized with carboxylic acid or sulfate groups.
  • Antimicrobial activity was assessed using disc diffusion, microdilution assays, and live/dead staining against Gram-negative and Gram-positive bacteria.
  • Fluorescence imaging was used to track nanoparticle and antibiotic migration.

Main Results:

  • PenG-NP complexes demonstrated statistically significant enhancement in bactericidal activity against Gram-negative and Gram-positive bacteria, including MRSA and MDR strains.
  • Fluorescence imaging confirmed the colocalization of NPs and antibiotics in inhibition zones.
  • Enhanced efficacy is attributed to the concentrated delivery of antibiotics by NPs, overwhelming bacterial resistance mechanisms.

Conclusions:

  • Penicillin G complexation with nanoparticles exhibits remarkable activity against diverse pathogenic bacteria, including MRSA and MDR strains.
  • The 'grenade hypothesis' explains the enhanced bactericidal effect due to concentrated antibiotic delivery.
  • This NP-based drug delivery approach holds potential for controlling antibiotic-resistant bacterial infections.
Keywords:
AntibioticAntibiotic-resistanceMDRMRSANanoparticlePenicillin-G

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