title: Glicentin inhibits internalization of enteric bacteria by cultured INT-407 enterocytes.
abstract: Glicentin, the main component of enteroglucagon, has trophic effects on intestinal mucosa. It may also have an inhibitory effect on extraintestinal invasion of enteric bacteria. We have established an in vitro bioassay system for determining the effects of recombinant human glicentin on bacterial internalization by confluent enterocytes. An INT-407 cell line was serum-deprived for 2 days and was then treated on transwell filters for 24 h with a medium containing one of the following: glicentin 100 ng-1 microg/ml, glucagons-like peptide-2 (GLP-2) 1 microg/ml, 10% fetal bovine serum (FCS), or without any growth factors. Pure cultures of Salmonella enteritidis, Escherichia coli, and Enterococcus faecalis were introduced to the upper chambers of the filter units. Following 2 h of incubation the numbers of bacteria in the lower chambers were measured. Pretreatment of enterocytes with glicentin inhibited bacterial internalization compared to untreated or GLP-2 enterocytes. Glicentin was associated with inhibition of enterocyte internalization of enteric bacteria by a mechanism that might be related to the integrity of the enterocyte adhesive junctions and tight junctions and to the production of sIgA. Glicentin seems to have a function as a barrier-sustaining agent that inhibits extraintestinal invasion of enteric bacteria.
authors.affiliation: Pediatric Surgery Services, Showa University School of Medicine, Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-ku, Yokohama, 227-8501, Japan. CYH02471@nifty.com
authors.forename: Masahiro
authors.initials: M
authors.lastname: Chiba
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Sanada
authors.forename: Shinya
authors.initials: S
authors.lastname: Kawano
authors.forename: Masayuki
authors.initials: M
authors.lastname: Murofushi
authors.forename: Ichiro
authors.initials: I
authors.lastname: Okada
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Yoshizawa
authors.forename: Akira
authors.initials: A
authors.lastname: Gomi
authors.forename: Masashi
authors.initials: M
authors.lastname: Yatsuzuka
authors.forename: Akira
authors.initials: A
authors.lastname: Toki
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Hirai
mesh_terms: D018988:Bacterial Translocation / Q000187:drug effects*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D013293:Enterococcus faecalis / Q000187:drug effects / Q000378:metabolism*; D020895:Enterocytes / Q000187:drug effects / Q000382:microbiology*; D004926:Escherichia coli / Q000187:drug effects / Q000378:metabolism*; D053771:Glicentin / Q000494:pharmacology*; D053767:Glucagon-Like Peptide 2 / Q000494:pharmacology; D006801:Humans; D010446:Peptide Fragments / Q000494:pharmacology; D011994:Recombinant Proteins; D012477:Salmonella enteritidis / Q000187:drug effects / Q000378:metabolism*
chemical_list: D053767:Glucagon-Like Peptide 2; D010446:Peptide Fragments; D011994:Recombinant Proteins; C451520:glucagon-like peptide-2 (3-33); D053771:Glicentin