Development of a Bladder Bioreactor for Tissue Engineering in Urology

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Urology

Background:

• Developing functional tissue replacements for the urinary bladder is crucial for treating bladder dysfunction.
• Existing methods lack the physiological simulation necessary for optimal cell growth and scaffold integration.

Purpose of the Study:

• To engineer a bioreactor that replicates physiological urinary bladder dynamics.
• To evaluate the efficacy of this bioreactor in supporting human urothelial cell (UC) growth on extracellular matrix (ECM) scaffolds.

Main Methods:

• Constructed a urinary bladder bioreactor with a cyclical low-delivery pressure regulator to mimic bladder filling.
• Cultured human urothelial cells (UCs) on porcine extracellular matrix (ECM) scaffolds within the bioreactor and in static conditions for 5 days.
• Assessed UC proliferation using quantitative viability indicators and fluorescent markers for cell membrane integrity and esterase activity.
• Characterized scaffold integrity using scanning electron microscopy and DAPI staining.

Main Results:

• UCs cultured in the bioreactor exhibited significantly enhanced proliferation and viability compared to static conditions.
• Fluorescent markers confirmed robust cell membrane integrity and intracellular esterase activity in bioreactor-cultured UCs.
• Scanning electron microscopy and DAPI staining indicated well-maintained scaffold integrity with UCs integrated within the ECM.

Conclusions:

• The developed urinary bladder bioreactor effectively simulates physiological bladder dynamics.
• This bioreactor system promotes superior urothelial cell growth and viability on ECM scaffolds, showing promise for bladder tissue engineering.