title: Bacterial lipopolysaccharide reduced intestinal barrier function and altered localization of 7H6 antigen in IEC-6 rat intestinal crypt cells.
abstract: The intestinal epithelial barrier restricts the passage of potentially toxic substances into the systemic circulation and is considered to be mostly mediated by tight junctions, though the mechanisms involved in the regulation of intestinal tight junctions are not yet fully understood. In the present study, we examined whether bacterial lipopolysaccharide (LPS) altered the barrier function of tight junction and localization of tight junctional proteins, ZO-1 and 7H6 antigen, in IEC-6 intestinal cells. Administration of LPS to the basolateral surface of IEC-6 cells disrupted the barrier function and caused the disappearance of 7H6 antigen from the cell border, whereas LPS administered to the apical surface altered neither the barrier function nor the localization of 7H6 antigen in IEC-6 cells. On the other hand, the localization of ZO-1 was not influenced by these treatments of LPS. These results suggest that the interaction of LPS with the basolateral surface of intestinal epithelial cells disrupts the barrier function and 7H6 antigen take part in the maintenance of the barrier function in IEC-6 cells.
authors.affiliation: Department of Pathology, Sapporo Medical University School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kimura
authors.forename: N
authors.initials: N
authors.lastname: Sawada
authors.forename: H
authors.initials: H
authors.lastname: Tobioka
authors.forename: H
authors.initials: H
authors.lastname: Isomura
authors.forename: Y
authors.initials: Y
authors.lastname: Kokai
authors.forename: K
authors.initials: K
authors.lastname: Hirata
authors.forename: M
authors.initials: M
authors.lastname: Mori
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D007365:Intercellular Junctions / Q000187:drug effects; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000166:cytology / Q000187:drug effects*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008565:Membrane Proteins / Q000378:metabolism*; D018613:Microscopy, Confocal; D010750:Phosphoproteins / Q000378:metabolism*; D051381:Rats
chemical_list: D008070:Lipopolysaccharides; D008565:Membrane Proteins; D010750:Phosphoproteins; C089734:antigen 7H6