Role of the urothelium in bladder function.

Area of Science:

• Urology
• Neuroscience
• Cell Biology

Background:

• The urinary bladder urothelium was traditionally considered a passive barrier.
• Emerging evidence indicates the urothelium possesses active sensor and transducer functions.
• Urothelial cells and bladder afferent nerves share common properties, like receptor expression.

Purpose of the Study:

• To review the evidence supporting the urothelium's sensory and transducer roles.
• To explore the functional interactions between urothelial cells and afferent nerves.
• To discuss the implications for pelvic sensory disorders.

Main Methods:

• Review of existing scientific literature.
• Analysis of studies on urothelial cell function.
• Examination of neuro-epithelial interactions in the bladder.

Main Results:

• The urothelium actively responds to thermal, mechanical, and chemical stimuli.
• Urothelial cells release chemical signals, influencing nerve activity.
• Shared expression of receptors, such as vanilloid receptor-1, is noted in urothelial cells and afferent nerves.

Conclusions:

• The urothelium functions as a sensory structure, not merely a passive barrier.
• Interactions between urothelial cells and afferent nerves are crucial for bladder sensation.
• Dysfunction in these urothelial or neural components may underlie pelvic sensory abnormalities.