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Updated: Aug 20, 2025
Author Spotlight: Exploring the Antibacterial Effects of Zinc Oxide Nanoparticles in Overcoming Antibiotic Resistance
Published on: September 27, 2024
Effect of Zinc Oxide Nanoparticles on Capsular Gene Expression in Klebsiella pneumoniae Isolated from Clinical
Nuha B Kudaer1, Mohseen H Risan1, Emad Yousif2
1College of Biotechnology, Al-Nahrain University, Baghdad 64021, Iraq.
Abstract:
Klebsiella pneumoniae is an opportunistic pathogen with various virulence factors that give it the capability to invade a host. Nevertheless, the treatment of bacterial infection is gradually complicated as the bacteria can develop resistance to antimicrobial agents. As nanotechnology is a prosperous field for researchers, we employed zinc oxide (ZnO) nanoparticles (NPs) on isolates of Klebsiella pneumoniae. Here, we studied the effect of three NP concentrations-0.25, 0.50, and 0.75 mM-on the gene expression of Klebsiella pneumoniae capsules in isolates collected from different samples. After conducting an anti-bacterial test, the highest nine types of bacteria that resisted the antibacterial agent were chosen for further examination. The gene expression of four genes responsible for capsule manufacturing, namely magA, k2A, rmpA, and kfu, were investigated. When the NP concentration was 0.25 mM, the lowest efficiency was obtained. However, when the concentration increased to 0.50 mM, a noticeable effect on gene expression was detected; consequently, at a concentration of 0.75 Mm, the highest impact was achieved and the gene expression was stopped.
Insights
Zinc oxide nanoparticles effectively inhibit Klebsiella pneumoniae virulence by downregulating capsule gene expression. Higher concentrations of zinc oxide (ZnO) nanoparticles show the most significant impact on reducing bacterial invasion capabilities.
Area of Science:
- Nanotechnology
- Microbiology
- Molecular Biology
Background:
- Klebsiella pneumoniae is an opportunistic pathogen causing infections that are difficult to treat due to antimicrobial resistance.
- Virulence factors, such as capsules, contribute to K. pneumoniae's ability to invade hosts.
- Nanoparticles offer a promising avenue for developing novel antimicrobial strategies.
Purpose of the Study:
- To investigate the effect of zinc oxide nanoparticles (ZnO NPs) on the gene expression of Klebsiella pneumoniae capsules.
- To determine the optimal concentration of ZnO NPs for inhibiting capsule gene expression in resistant K. pneumoniae isolates.
Main Methods:
- Selected nine K. pneumoniae isolates exhibiting high resistance to antibacterial agents.
- Exposed isolates to varying concentrations of ZnO NPs (0.25, 0.50, and 0.75 mM).
- Quantified the gene expression levels of four key capsule manufacturing genes: magA, k2A, rmpA, and kfu.
Main Results:
- A concentration of 0.25 mM ZnO NPs showed minimal effect on capsule gene expression.
- A concentration of 0.50 mM ZnO NPs demonstrated a noticeable reduction in gene expression.
- The highest concentration, 0.75 mM ZnO NPs, effectively halted the expression of all investigated capsule genes.
Conclusions:
- Zinc oxide nanoparticles exhibit potent antimicrobial properties against Klebsiella pneumoniae by targeting capsule production.
- ZnO NPs represent a viable therapeutic approach to combatting K. pneumoniae infections, particularly those involving resistant strains.
- The study highlights the dose-dependent efficacy of ZnO NPs in inhibiting bacterial virulence factors.
