Mechanical stimulation of intestinal wall

Mechanical stimulation of the intestinal wall is a physiological process and stimulus rather than a specific molecular target or receptor. It involves the detection of physical forces, such as stretch or distension, by mechanosensitive components within the gut wall, including Piezo-type mechanosensitive ion channels (specifically Piezo2) located on enterochromaffin (EC) cells and intrinsic primary afferent neurons (IPANs) (Alcaino et al., 2018, Nature Communications; Coste et al., 2010, Science). Upon mechanical activation, these cells release signaling molecules, most notably serotonin (5-HT), which bind to 5-HT3 and 5-HT4 receptors to initiate the peristaltic reflex and modulate gastrointestinal transit (Bulbring & Crema, 1959, Journal of Physiology). Although not a protein, this mechanism is the primary therapeutic target for bulk-forming laxatives (e.g., psyllium) and mechanical interventions like vibrating capsules, which aim to restore normal motility in patients with chronic constipation (Rao et al., 2023, The Lancet Gastroenterology & Hepatology). Dysfunction in the sensing of mechanical stimuli is a key factor in the pathophysiology of functional gastrointestinal disorders, such as irritable bowel syndrome (IBS), where it may contribute to visceral hypersensitivity or dysmotility (Beyder & Farrugia, 2012, Gut).

Other names

Intestinal mechanostimulationGut wall distensionMechanical distension of the bowelBowel wall stretch

Activation of mechanosensitive ion channels (e.g., Piezo2) on enterochromaffin cells and enteric neurons, leading to the release of prokinetic neurotransmitters like serotonin and initiation of the peristaltic reflex.