Intestinal sensory neuron (primary intrinsic afferent neuron; IPA neuron) (IPAN)

Intestinal sensory nerve endings collectively refer to the highly specialized nerve terminals arising from neuronal subtypes in the intestinal wall, predominantly intrinsic primary afferent neurons (IPANs) located within the myenteric and submucosal plexuses, as well as extrinsic afferent fibers (vagal and spinal). These endings transduce mechanical (stretch/distension) and chemical (nutrient, pH, toxin) stimuli into neural signals, mediating local reflexes that coordinate motility, secretion, and neuroimmune communication. Major molecular mechanisms involve mechanically gated channels (e.g., Piezo2), chemosensory channels (e.g., TRPA1), and neurotransmitter receptors (e.g., 5-HT3 for serotonin, tachykinin, and CGRP receptors). Disorders of these sensory neurons may contribute to gut pain, dysmotility, and other gastrointestinal diseases. Since "Intestinal sensory nerve endings" is not a canonical name for a drug target, direct mapping to a molecular target or single receptor is not possible. For drug discovery or biomarker purposes, identifying molecular entities (e.g., Piezo2, 5-HT3 receptor on IPANs) is required.

Other names

Intrinsic primary afferent neuronIPANenteric sensory neuronenteric sensory nerve endingDogiel type II neuronvagal afferent nerve endingspinal afferent nerve ending

Modulation of sensory signal transduction by targeting ion channels or neurotransmitter receptors expressed by sensory neurons (e.g., antagonism of 5-HT3 receptors reduces sensory neuron activation; Piezo2 inhibition interferes with mechanosensation)