The antimicrobial potential of adarotene derivatives against Staphylococcus aureus strains

Area of Science:

• Medicinal Chemistry
• Microbiology
• Pharmacology

Background:

• Multidrug-resistant (MDR) pathogens pose a significant threat to public health.
• Existing antibiotics are becoming less effective against common bacterial infections.

Purpose of the Study:

• To synthesize and evaluate adarotene-related retinoids for antimicrobial activity against Staphylococcus aureus.
• To investigate the mechanism of action and safety profile of promising retinoid candidates.

Main Methods:

• Synthesis of adarotene analogues.
• Antimicrobial susceptibility testing against Staphylococcus aureus strains.
• Fluorescence and molecular dynamics studies to assess membrane interaction.
• Cytotoxicity assays on human cell lines.
• Pharmacokinetic studies and combination therapy evaluation with rifaximin.

Main Results:

• Adarotene analogues demonstrated potent antimicrobial activity against both drug-susceptible and MDR Staphylococcus aureus.
• Mechanism of action involves inducing conformational changes and dysfunction in bacterial cell membranes, increasing permeability.
• Selected candidate showed low cytotoxicity to human cell lines (IC50 5-15-fold higher than MIC).
• The compound exhibited favorable pharmacokinetics, achieving therapeutic plasma concentrations.
• Combination with rifaximin potentiated growth-inhibitory effects.

Conclusions:

• Synthetic retinoids, specifically adarotene analogues, are effective against multidrug-resistant Staphylococcus aureus.
• These compounds target bacterial cell membranes and possess a favorable safety and pharmacokinetic profile.
• Adarotene analogues represent a promising new class of therapeutics for treating challenging Gram-positive bacterial infections.