title: Effect of periodontopathogen lipopolysaccharides and proinflammatory cytokines on CD46, CD55, and CD59 gene/protein expression by oral epithelial cells.
abstract: Membrane-anchored complement regulatory proteins (CRPs), including CD46, CD55, and CD59, protect host cells from complement attack. In the present study, we investigated whether periodontopathogen lipopolysaccharide and proinflammatory cytokines modulate CRP gene/protein expression in human oral epithelial cells. The lipopolysaccharide of Treponema denticola and Tannerella forsythia were the most potent for increasing the gene expression of CD55 and CD59, and to a lesser extent CD46, after a 48-h stimulation. An lipopolysaccharide-induced upregulation of epithelial cell-surface CRP was also demonstrated. The stimulation of epithelial cells with lipopolysaccharide was associated with interleukin-6 (IL-6) and IL-8 secretion. Although these two cytokines had no effect on CD46 and CD55 gene expression in epithelial cells, IL-1β and tumor necrosis factor-α induced a significant upregulation. The cell-surface expression of CRP was also increased by the stimulation of epithelial cells with cytokines. The CD46, CD55, and CD59 gene/protein expression was upregulated by periodontopathogen lipopolysaccharide and proinflammatory cytokines. It can be hypothesized that, when faced with bacterial challenges and inflammatory conditions associated with active periodontal sites, oral epithelial cells may respond by increasing CRP gene/protein expression to avoid cell lysis by the complement system, which is activated during periodontitis.
authors.affiliation: Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Quebec City, QC, Canada.
authors.forename: Hayette
authors.initials: H
authors.lastname: Mahtout
authors.forename: Sèverine
authors.initials: S
authors.lastname: Curt
authors.forename: Fatiha
authors.initials: F
authors.lastname: Chandad
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Rouabhia
authors.forename: Daniel
authors.initials: D
authors.lastname: Grenier
mesh_terms: D015703:Antigens, CD / Q000096:biosynthesis / Q000235:genetics*; D041963:Bacteroidetes / Q000276:immunology; D018958:CD55 Antigens / Q000096:biosynthesis / Q000235:genetics; D018957:CD59 Antigens / Q000096:biosynthesis / Q000235:genetics; D002461:Cell Line, Transformed; D016207:Cytokines / Q000494:pharmacology*; D004847:Epithelial Cells / Q000187:drug effects / Q000276:immunology; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology*; D051916:Membrane Cofactor Protein / Q000096:biosynthesis / Q000235:genetics; D008856:Microscopy, Fluorescence; D009061:Mouth Mucosa / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D015661:Pasteurellaceae / Q000276:immunology; D016966:Porphyromonas gingivalis / Q000276:immunology; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D048373:Treponema denticola / Q000276:immunology
chemical_list: D015703:Antigens, CD; C497857:CD46 protein, human; D018958:CD55 Antigens; D018957:CD59 Antigens; D016207:Cytokines; D008070:Lipopolysaccharides; D051916:Membrane Cofactor Protein; D011994:Recombinant Proteins; C051590:CD59 protein, human