Cultured urothelium in sheep bladder augmentation.

Area of Science:

• Regenerative Medicine
• Urology
• Tissue Engineering

Background:

• Urinary bladder augmentation and reconstruction face challenges with current methods.
• Gastrointestinal (GI) segments are explored as alternatives, but can cause complications.
• Autologous urothelial cell transplantation offers potential for improved bladder lining.

Purpose of the Study:

• To evaluate the feasibility of using in-vitro cultured autologous urothelial cells with GI segments for bladder augmentation in a sheep model.
• To assess the survival, proliferation, and integration of transplanted urothelial cells.
• To determine the functional and morphological outcomes of augmented bladders.

Main Methods:

• Autologous urothelial cells were cultured from bladder biopsies and expanded on biodegradable carriers.
• Cell-seeded carriers were transplanted onto demucosalized stomach or colon segments in sheep.
• Augmented bladder segments were incorporated into the native bladder.
• Radiologic and urodynamic assessments were performed at follow-up.

Main Results:

• Cultured urothelial cells survived and showed some proliferation on GI segments in vivo.
• Augmented bladders demonstrated good shape, capacity, and compliance at 5-6 months.
• Transplanted urothelial cells appeared to accelerate healing and reduce fibrosis compared to GI augmentation alone.

Conclusions:

• In-vitro cultured autologous urothelial cells can be successfully established and applied in a sheep model for bladder augmentation.
• The bladder environment is crucial for complete urothelial coverage of augmented segments.
• This approach shows potential for improving functional outcomes in bladder reconstruction.