Urinary tract mucosal sensory nerve endings

Urinary tract mucosal sensory nerve endings are specialized afferent fibers, primarily A-delta and C-fibers, located within the urothelium and suburothelial space of the bladder and urethra (Fowler et al., 2008). These nerve endings serve as the primary sensors for mechanical stretch and chemical stimuli, transmitting signals to the central nervous system to regulate the micturition reflex and signal pain (Birder & Andersson, 2013). They express a diverse array of molecular targets, including Transient Receptor Potential Vanilloid 1 (TRPV1), purinergic P2X3 receptors, and acid-sensing ion channels (ASICs) (Andersson, 2002). In conditions like overactive bladder (OAB) and interstitial cystitis, these sensory endings exhibit hypersensitivity or increased density, contributing to symptoms of urgency and chronic pelvic pain (Wyndaele et al., 2001). Therapeutic strategies often target these endings through intravesical administration of drugs like lidocaine to block sodium channels or capsaicin to desensitize TRPV1 receptors (Chancellor & de Groat, 1999). Additionally, botulinum toxin A is utilized to inhibit the release of sensory neuropeptides such as Substance P and Calcitonin Gene-Related Peptide (CGRP) from these terminals (Apostolidis et al., 2006).

Other names

Bladder mucosal afferentsSuburothelial sensory nervesUrinary tract afferent nerve endingsUrothelial sensory fibers

Inhibition of voltage-gated sodium channels, desensitization of TRPV1 ion channels, and blockade of SNAP-25 mediated exocytosis of sensory neuropeptides (Fowler et al., 2008; Apostolidis et al., 2006).