title: The effects of 5-HT4 receptor agonist, mosapride citrate, on visceral hypersensitivity in a rat model.
abstract: OBJECTIVE
  Mosapride citrate is known to affect gastric motility. However, whether mosapride citrate has any effect on visceral pain in the colon or rectum is not certain. The aim of this study was to assess the effects of mosapride citrate on visceral pain in a rat visceral hypersensitivity model.
  
  
  METHODS
  The perception of visceral pain was evaluated by the visceromotor response to colorectal distension observed on electromyographs of the abdominal musculature in urethane-anesthetized rats. Visceral hypersensitivity was induced by the intrarectal instillation of 4% acetic acid or 1.5% zymosan. Mosapride citrate was administered intraperitoneally 3 h later. VMRs to CRD were recorded prior to the instillation of acetic acid or zymosan and before and after mosapride citrate treatment.
  
  
  RESULTS
  The intracolonic instillation of acetic acid resulted in a significant increase in VMRs of the abdominal muscles to CRD, compared with the pretreatment state (174 ± 24%, P < 0.05). The intracolonic instillation of zymosan resulted in a significant increase in VMRs of the abdominal muscles to CRD, compared with the pretreatment state (144 ± 9%, P < 0.05). Intraperitoneal injection of mosapride citrate resulted in a significant reduction in the VMRs to CRD in an acetic acid-induced visceral hypersensitivity rat model (61 ± 9%, P < 0.05). The intraperitoneal injection of mosapride citrate also resulted in a significant reduction in the VMRs to CRD in a zymosan-induced visceral hypersensitivity rat model (67 ± 9%, P < 0.05).
  
  
  CONCLUSIONS
  Mosapride citrate diminished visceral pain in rats.
authors.affiliation: Division of Gastroenterology, Hanil General Hospital, Seoul, Korea.
authors.forename: Jae Woong
authors.initials: JW
authors.lastname: Lee
authors.forename: Ki Woon
authors.initials: KW
authors.lastname: Sung
authors.forename: Oh Young
authors.initials: OY
authors.lastname: Lee
authors.forename: Seo Eun
authors.initials: SE
authors.lastname: Lee
authors.forename: Chong Il
authors.initials: CI
authors.lastname: Sohn
mesh_terms: D000818:Animals; D001549:Benzamides / Q000494:pharmacology*; D004195:Disease Models, Animal; D004576:Electromyography; D005769:Gastrointestinal Motility / Q000187:drug effects* / Q000502:physiology; D006967:Hypersensitivity / Q000188:drug therapy / Q000503:physiopathology; D007274:Injections, Intraperitoneal; D008297:Male; D009025:Morpholines / Q000494:pharmacology*; D010147:Pain Measurement; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D012016:Reference Values; D058828:Serotonin 5-HT4 Receptor Agonists / Q000494:pharmacology*; D016896:Treatment Outcome; D059265:Visceral Pain / Q000188:drug therapy* / Q000503:physiopathology
chemical_list: D001549:Benzamides; D009025:Morpholines; D058828:Serotonin 5-HT4 Receptor Agonists; C062720:mosapride