Micro-bladder model offers clues to stopping recurrent UTIs

A groundbreaking study published in Nature Communications suggests that a lab-grown micro-bladder model could provide insights into why urinary tract infections (UTIs) recur so frequently. Led by researchers at UCL, the University of Oxford and the University of Leicester, the study found that phage therapy - using tiny viruses to kill bacteria without harming people - could help reduce recurrent infections.

UTIs are one of the most common infections worldwide, with around 400 million cases annually. They can be painful and disruptive, and often return after antibiotic treatment. The research team engineered a novel human 3D micro-bladder model with flowing urine to mimic the natural bladder environment. This model allowed them to test phage therapy on UTI bacteria and observe how it performed in a realistic setting.

Key findings include the identification of "reservoirs" - areas of the bladder where bacteria can hide and survive antibiotics. Phage therapy was able to reach these hidden reservoirs, effectively killing bacteria that conventional antibiotics missed. This suggests that a combined approach of phage therapy and antibiotics may be more effective in treating recurrent UTIs.

The study also revealed that urine flow in the bladder environment significantly alters bacterial behavior and treatment response, highlighting the limitations of traditional laboratory tests. Lead author Dr. Ramon Garcia Maset noted that phage therapy reached hidden bacterial reservoirs, addressing the root cause of infections.

While phage therapy is not yet a standard treatment for UTIs, the study's findings offer a promising avenue for developing more effective, long-lasting solutions for recurrent UTI sufferers.