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Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
Published on: October 25, 2013
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Potentiation of Vancomycin: Creating Cooperative Membrane Lysis through a "Derivatization-for-Sensitization" Approach
E Lei1, Huanyu Tao2, Shang Jiao3
1Institute of Chemical Biology and Nanomedicine, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan Provincial Key Laboratory of Biomacromolecular Chemical Biology, and School of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
Journal of the American Chemical Society
|June 3, 2022
Summary
This study introduces a novel hybrid approach to overcome antibiotic resistance in Gram-negative bacteria. It enhances vancomycin
Area of Science:
- Microbiology and Infectious Diseases
- Drug Delivery and Nanotechnology
- Biochemistry and Molecular Biology
Background:
- Gram-negative bacteria possess a challenging outer membrane (OM) that restricts antibiotic entry, particularly for large hydrophilic drugs like vancomycin.
- Existing methods for enhancing antibiotic permeability, such as lipophilic-cationic derivatization and membrane-active agents, are ineffective for vancomycin due to poor OM disruption.
- Multidrug resistance in Gram-negative bacteria necessitates novel strategies to restore antibiotic efficacy.
Purpose of the Study:
- To develop a hybrid "derivatization-for-sensitization" strategy to enhance vancomycin's penetration through the Gram-negative bacterial outer membrane.
- To achieve high-degree outer membrane binding and potentiation of vancomycin's antimicrobial activity.
- To evaluate the efficacy of this approach against multidrug-resistant Gram-negative bacteria.
Main Methods:
- Developed a vancomycin derivative with lipo-cationic modifications targeting lipopolysaccharides (LPS) on the outer membrane.
- Combined the modified vancomycin with a sensitizing adjuvant designed for outer membrane disruption.
- Assessed the synergistic antimicrobial activity and mechanism of action, including cooperative membrane binding and lysis.
- Evaluated in vivo efficacy in a mouse model.
Main Results:
- Achieved a 106- to 107-fold potentiation of vancomycin's activity when used with the sensitizer.
- Increased the sensitizer's effectiveness by 20-fold.
- Demonstrated direct membrane lysis via cooperative binding of the sensitizer-antibiotic complex, facilitating vancomycin uptake.
- Showcased potent in vivo antimicrobial efficacy in mouse models.
Conclusions:
- The hybrid "derivatization-for-sensitization" approach effectively overcomes the outer membrane barrier in Gram-negative bacteria.
- This strategy significantly potentiates vancomycin's efficacy and demonstrates broad antiresistance potential.
- The approach is adaptable for other antibiotics and sensitizer structures, offering a versatile platform for combating antimicrobial resistance.
