Synthetic cajaninstilbene acid derivatives eradicate methicillin-resistant Staphylococcus aureus persisters and...

Area of Science:

• Microbiology
• Medicinal Chemistry
• Pharmacology

Background:

• Staphylococcus aureus forms persister cells, a dormant state contributing to antibiotic resistance.
• Methicillin-resistant S. aureus (MRSA) persisters pose a significant clinical challenge, necessitating novel eradication strategies.

Purpose of the Study:

• To design and synthesize novel cajaninstilbene acid (CSA) derivatives.
• To evaluate the efficacy of these derivatives against MRSA persisters and biofilms.
• To identify a lead compound for potential MRSA persister infection treatment.

Main Methods:

• Synthesis of 37 new CSA derivatives.
• Antimicrobial activity testing against S. aureus and MRSA persisters.
• Mechanism of action studies (cell membrane targeting) and in vitro biofilm eradication assays.
• In vivo efficacy evaluation in a mouse abscess model.

Main Results:

• Most synthesized derivatives displayed enhanced antimicrobial activity compared to CSA.
• 23 out of 37 derivatives demonstrated MRSA persister eradication potential.
• Compound A6 effectively eradicated MRSA biofilms and showed synergistic effects with piperacillin.
• A6 significantly reduced bacterial load in a mouse abscess model.

Conclusions:

• Novel CSA derivatives exhibit potent activity against MRSA persisters.
• Compound A6 is a promising candidate for treating MRSA persister infections due to its membrane-targeting mechanism and in vivo efficacy.