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In vitro and in vivo antimicrobial potential of lithium complex against multi-drug resistant Acinetobacter baumannii
Moatter Zehra1, Yamina Usmani1,2, Jazib Shafiq1
1Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi , Karachi, Pakistan.
Importance:
Multi-drug resistance (MDR) by virtue of evolving resistance and virulence mechanisms among A. baumannii is a global concern which is responsible for lethal hospital-acquired infections. Therefore, it is crucial to develop new therapeutics against it. Metal complexes are compact structures with diverse mechanisms that the pathogens cannot evade easily which make them a strong drug candidate. In this study, we assessed the in vitro and in vivo efficacy of lithium complex {[Li(phen)2 sal]} against biofilm-forming MDR A. baumannii. The lithium complex displayed strong antimicrobial activity and reduced the pre-formed mature biofilm which is key barrier for antimicrobial action. Moreover, it employs oxidative stress as one of its mode of actions and causes cellular rupturing. Lithium complex was non-toxic and was significantly effective to overcome pneumonia in mice model. These results highlight the untapped potential of metal complexes that can be explored and utilized for combating notorious A. baumannii infections.
Insights
A novel lithium complex effectively combats multi-drug resistant Acinetobacter baumannii infections. This compound shows strong antimicrobial activity, reduces biofilms, and is safe and effective against pneumonia in mice.
Area of Science:
- Microbiology
- Infectious Diseases
- Medicinal Chemistry
Background:
- Multi-drug resistant (MDR) Acinetobacter baumannii is a significant cause of hospital-acquired infections.
- Developing novel therapeutics against MDR A. baumannii is critical due to evolving resistance mechanisms.
- Metal complexes offer unique mechanisms of action against pathogens, making them promising drug candidates.
Purpose of the Study:
- To evaluate the in vitro and in vivo efficacy of a lithium complex, {[Li(phen)2 sal]}, against biofilm-forming MDR A. baumannii.
- To investigate the mechanism of action of the lithium complex.
- To assess the safety and therapeutic potential of the lithium complex in a murine pneumonia model.
Main Methods:
- In vitro antimicrobial susceptibility testing against MDR A. baumannii.
- Biofilm inhibition and eradication assays.
- In vivo efficacy study in a murine model of pneumonia.
- Assessment of cytotoxicity and mechanism of action (oxidative stress).
Main Results:
- The lithium complex demonstrated potent antimicrobial activity against MDR A. baumannii.
- It effectively reduced pre-formed mature biofilms, a critical challenge in antimicrobial therapy.
- The complex induced oxidative stress, leading to cellular rupturing.
- The lithium complex was non-toxic and significantly improved outcomes in a mouse model of pneumonia.
Conclusions:
- The lithium complex {[Li(phen)2 sal]} is a promising therapeutic agent against MDR A. baumannii.
- Its ability to combat biofilms and induce oxidative stress provides a novel approach to overcoming resistance.
- Metal complexes represent a valuable class of compounds for developing new treatments for challenging bacterial infections.
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