title: Polyethylene glycol enhances colonic barrier function and ameliorates experimental colitis in rats.
abstract: OBJECTIVE
  Polyethylene glycol (PEG) has been suggested to protect against pathogen colonization by improving colonic barrier function. We aimed to establish whether PEG 4000 affects colonic barrier function and the development of colitis induced by 2,4,6-trinitrobenzenesulfonic acid (TNBS) in rats.
  
  
  METHODS
  PEG was included in the drinking water for a period of 48 h before intracolonic administration of TNBS.
  
  
  CONCLUSIONS
  PEG increased colonic surface hydrophobicity and diminished luminal bacterial load. Moreover, PEG markedly reduced mucosal damage and inflammation induced by TNBS. This protection effect appeared to be independent of its laxative properties since the laxatives mannitol or senna extracts had no effect on TNBS colitis. Using everted colonic sacs, pretreatment with PEG produced a lasting reduction in epithelial permeability to mannitol and dextran-70 K that correlated with decreased surface hydrophobicity.
  
  
  CONCLUSIONS
  Our results suggest that the protective effect of PEG on TNBS colitis is associated with reinforcement of the epithelial barrier.
authors.affiliation: Digestive System Research Unit, Hospital General Vall d'Hebron, Barcelona, Spain.
authors.forename: Sebastián
authors.initials: S
authors.lastname: Videla
authors.forename: Aurelia
authors.initials: A
authors.lastname: Lugea
authors.forename: Jaime
authors.initials: J
authors.lastname: Vilaseca
authors.forename: Francisco
authors.initials: F
authors.lastname: Guarner
authors.forename: Francesc
authors.initials: F
authors.lastname: Treserra
authors.forename: Antonio
authors.initials: A
authors.lastname: Salas
authors.forename: Ernesto
authors.initials: E
authors.lastname: Crespo
authors.forename: Carlos
authors.initials: C
authors.lastname: Medina
authors.forename: Juan R
authors.initials: JR
authors.lastname: Malagelada
mesh_terms: D000818:Animals; D002400:Cathartics / Q000494:pharmacology; D003092:Colitis / Q000139:chemically induced / Q000188:drug therapy*; D003106:Colon / Q000187:drug effects / Q000382:microbiology / Q000503:physiopathology*; D057927:Hydrophobic and Hydrophilic Interactions; D018836:Inflammation Mediators / Q000378:metabolism; D007413:Intestinal Mucosa / Q000187:drug effects / Q000473:pathology; D008297:Male; D011092:Polyethylene Glycols / Q000627:therapeutic use*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014302:Trinitrobenzenesulfonic Acid; D015430:Weight Gain / Q000187:drug effects
chemical_list: D002400:Cathartics; D018836:Inflammation Mediators; D011092:Polyethylene Glycols; D014302:Trinitrobenzenesulfonic Acid