Lower urinary tract sensory pathways (LUT sensory pathways)

The lower urinary tract (LUT) sensory pathways, often referred to as the urinary tract mucosal sensory pathways, constitute a complex signaling network involving the urothelium, suburothelial interstitial cells, and afferent nerve fibers (A-delta and C-fibers) (Yoshimura et al., 2008). The urothelium acts as a primary sensor, responding to mechanical stretch and chemical stimuli by releasing various mediators such as adenosine triphosphate (ATP), acetylcholine (ACh), and nitric oxide (NO) (Birder et al., 2001). These mediators then activate receptors on suburothelial nerves, including purinergic (P2X3), vanilloid (TRPV1), and muscarinic receptors, which transmit sensory information to the central nervous system to regulate the micturition reflex (Andersson, 2019). Dysregulation of these pathways, often characterized by increased sensitivity or 'afferent sensitization,' is a key factor in the pathophysiology of conditions like overactive bladder (OAB), interstitial cystitis, and bladder pain syndrome (Kanai & Andersson, 2010). Pharmacological interventions targeting these pathways aim to modulate sensory input, using agents such as TRPV1 agonists (for desensitization), P2X3 antagonists, or muscarinic antagonists to alleviate symptoms of urgency and pain (Andersson, 2019; Grundy et al., 2025).

Other names

Urinary tract mucosal sensory pathwaysBladder mucosal sensory signalingUrothelial-afferent pathwaysMicturition reflex afferent limbLower urinary tract afferent pathways

Modulation of afferent signaling through desensitization of TRPV1-expressing sensory fibers, antagonism of P2X3 purinergic receptors, activation of beta-3 adrenergic receptors, and blockade of muscarinic receptors on the urothelium and suburothelial nerves.