title: Role of meprins to protect ileal mucosa of Crohn's disease patients from colonization by adherent-invasive E. coli.
abstract: Ileal lesions in Crohn's disease (CD) patients are colonized by pathogenic adherent-invasive Escherichia coli (AIEC) able to adhere to and invade intestinal epithelial cells (IEC), and to survive within macrophages. The interaction of AIEC with IEC depends on bacterial factors mainly type 1 pili, flagella, and outer membrane proteins. In humans, proteases can act as host defence mechanisms to counteract bacterial colonization. The protease meprin, composed of multimeric complexes of the two subunits alpha and beta, is abundantly expressed in IECs. Decreased levels of this protease correlate with the severity of the inflammation in patients with inflammatory bowel disease. The aim of the present study was to analyze the ability of meprin to modulate the interaction of AIEC with IECs. In patients with ileal CD we observed decreased levels of meprins, in particular that of meprin β. Dose-dependent inhibition of the abilities of AIEC strain LF82 to adhere to and invade intestinal epithelial T84 cells was observed when bacteria were pre-treated with both exogenous meprin α and meprin β. Dose-dependent proteolytic degradation of type 1 pili was observed in the presence of active meprins, but not with heat-inactivated meprins, and pretreatment of AIEC bacteria with meprins impaired their ability to bind mannosylated host receptors and led to decreased secretion of the pro-inflammatory cytokine IL-8 by infected T84 cells. Thus, decreased levels of protective meprins as observed in CD patients may contribute to increased AIEC colonization.
authors.affiliation: Clermont Université, JE2526 Université d'Auvergne, Clermont-Ferrand, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Vazeille
authors.forename: Marie-Agnès
authors.initials: MA
authors.lastname: Bringer
authors.forename: Aurélie
authors.initials: A
authors.lastname: Gardarin
authors.forename: Christophe
authors.initials: C
authors.lastname: Chambon
authors.forename: Christoph
authors.initials: C
authors.lastname: Becker-Pauly
authors.forename: Sylvia L F
authors.initials: SL
authors.lastname: Pender
authors.forename: Christine
authors.initials: C
authors.lastname: Jakob
authors.forename: Stefan
authors.initials: S
authors.lastname: Müller
authors.forename: Daniel
authors.initials: D
authors.lastname: Lottaz
authors.forename: Arlette
authors.initials: A
authors.lastname: Darfeuille-Michaud
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001422:Bacterial Adhesion / Q000502:physiology*; D003424:Crohn Disease / Q000382:microbiology* / Q000503:physiopathology; D004926:Escherichia coli / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D016209:Interleukin-8 / Q000378:metabolism; D007413:Intestinal Mucosa / Q000382:microbiology* / Q000503:physiopathology; D008297:Male; D008666:Metalloendopeptidases / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008875:Middle Aged
chemical_list: D016209:Interleukin-8; D008666:Metalloendopeptidases; C053833:meprin A