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Updated: May 6, 2026
Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
Published on: October 25, 2013
Vancomycin-modified mesoporous silica nanoparticles for selective recognition and killing of pathogenic gram-positive
Guobin Qi1, Lili Li, Faquan Yu
1Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology , No. 693 Xiongchu Avenue, Hongshan, wuhan 430073, China.
Abstract:
Rapid, reliable recognition and detection of bacteria from an authentic specimen have been gained increasing interests in the past decades. Various materials have been designed and prepared for implementation of bacterial recognition and treatment in the artificial systems. However, in the complicated physiological condition, the macrophages always compromise the outcomes of bacterial detection and/or treatment. In this work, we demonstrated the vancomycin-modified mesoporous silica nanoparticles (MSNs is a subset of Van) for efficiently targeting and killing gram-positive bacteria over macrophage-like cells. Owing to the specific hydrogen bonding interactions of vancomycin toward the terminal d-alanyl-d-alanine moieties of gram-positive bacteria, the MSNs is a subset of Van exhibited enhanced recognition for gram-positive bacteria due to the multivalent hydrogen binding effect. Furthermore, the fluorescent molecules (FITC) were covalently decorated inside of mesopores of MSNs for tracking and visualizing the MSNs is a subset of Van during the detection/treatment processes. Upon incubation of FITC decorated MSNs with bacteria (i.e., S. aureus and E. coli as gram-positive and gram-negative bacteria, respectively) or macrophage-like cells (Raw 264.7), the fluorescence signals in S. aureus were 2-4 times higher than that in E. coli and no detectable fluorescence signals were observed in Raw 264.7 cells under the same condition. Finally, the MSNs is a subset of Van showed unambiguous antibacterial efficacy without decrease in cell viability of macrophage-like cells. This new strategy opens a new door for specific detection and treatment of pathogenic bacteria with minimized side effects.
Insights
Vancomycin-modified mesoporous silica nanoparticles (MSNs) efficiently target and kill gram-positive bacteria. This novel approach enhances bacterial detection and treatment while minimizing side effects on macrophage-like cells.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Infectious Disease Research
Background:
- Bacterial detection and treatment face challenges in complex physiological environments due to macrophage interference.
- Existing materials for bacterial recognition and treatment often lack specificity.
- Developing targeted antimicrobial strategies is crucial for effective infection control.
Purpose of the Study:
- To develop vancomycin-modified mesoporous silica nanoparticles (MSNs) for targeted recognition and killing of gram-positive bacteria.
- To overcome macrophage-related limitations in bacterial detection and treatment.
- To create a system for visualizing nanoparticle distribution and efficacy.
Main Methods:
- Vancomycin was used to modify mesoporous silica nanoparticles (MSNs) for enhanced targeting of gram-positive bacteria via hydrogen bonding.
- Fluorescent molecules (FITC) were incorporated into MSNs for tracking and visualization.
- The specificity and efficacy of the modified MSNs were evaluated using Staphylococcus aureus (gram-positive), Escherichia coli (gram-negative), and Raw 264.7 macrophage-like cells.
Main Results:
- Vancomycin-modified MSNs showed enhanced recognition of gram-positive bacteria due to multivalent hydrogen binding.
- Fluorescence signals were significantly higher in S. aureus compared to E. coli, with no signal detected in macrophage-like cells.
- The MSNs demonstrated potent antibacterial activity against gram-positive bacteria without compromising macrophage viability.
Conclusions:
- Vancomycin-modified MSNs offer a promising strategy for the specific detection and treatment of gram-positive bacterial infections.
- This approach effectively targets pathogenic bacteria while minimizing adverse effects on host cells.
- The developed nanoparticles represent a significant advancement in combating bacterial infections with improved safety and efficacy.
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