HuR-Targeted Small Molecules Reduce Pseudomonas aeruginosa Adhesion in Cystic Fibrosis Airway Epithelial Cells

Area of Science:

• Microbiology
• Pharmacology
• Genetics

Background:

• Antibiotic-resistant infections pose a significant threat in cystic fibrosis (CF).
• Chronic Pseudomonas aeruginosa colonization in CF lungs is driven by bacterial adhesion.
• Fibronectin (Fn) and adhesion proteins facilitate bacterial docking, with Human Antigen R (HuR) regulating this process via Vav3 mRNA stabilization.

Purpose of the Study:

• To synthesize and evaluate a novel small molecule, (2S,3S)-BOPC1, targeting the HuR protein.
• To investigate the efficacy of (2S,3S)-BOPC1 in reducing P. aeruginosa adhesion in CF models.
• To assess the safety profile of (2S,3S)-BOPC1 in human airway epithelial cells.

Main Methods:

• Synthesis and optimization of the HuR-targeted small molecule (2S,3S)-BOPC1.
• Functional assays using CF human airway epithelial cells.
• Assessment of P. aeruginosa adhesion and cytotoxicity.

Main Results:

• (2S,3S)-BOPC1 significantly reduced P. aeruginosa adhesion in a dose-dependent manner.
• No detectable cytotoxic effects were observed in CF human airway epithelial cells.
• The HuR-Vav3-Fn axis was successfully disrupted, decreasing bacterial attachment.

Conclusions:

• Targeting HuR with (2S,3S)-BOPC1 is a viable strategy to inhibit P. aeruginosa adhesion in CF.
• This host-directed approach offers a promising alternative to antibiotics for preventing chronic CF infections.
• The findings support the development of HuR inhibitors as a novel therapeutic avenue for CF.