title: Induction of interleukin (IL)-1β, IL-10, IL-8 and immunoglobulin G by Porphyromonas gingivalis HmuY in humans.
abstract: OBJECTIVE
  Porphyromonas gingivalis, an anaerobic gram-negative bacterium, is associated with chronic periodontitis. This study was undertaken to evaluate the production of interleukin (IL)-1β, IL-8 and IL-10 by human peripheral blood mononuclear cells (PBMC) stimulated with P. gingivalis antigens and to assess the levels of serum immunoglobulin (Ig)G, IgA and IgG subclasses raised against P. gingivalis HmuY protein.
  
  
  METHODS
  PBMC from patients with chronic periodontitis (CP) and from nonperiodontitis (NP) control subjects were stimulated with P. gingivalis antigens, and the cytokine levels in the culture supernatants were determined by ELISA. The specificity of serum antibodies raised against HmuY was analyzed by Western blotting and by ELISA.
  
  
  RESULTS
  Compared with the NP controls, the CP patients produced higher levels of total serum IgG and IgG1 specific for P. gingivalis HmuY. No differences were found between CP and NP groups in the production of IL-1β and IL-8 by PBMC stimulated with total P. gingivalis antigens. Only P. gingivalis lipopolysaccharide (LPS) induced higher levels of IL-10 in the CP group. Higher levels of IL-1β and IL-10 were induced by HmuY than by other antigens derived from the wild-type P. gingivalis strains. In contrast, total antigens derived from the hmuY-deletion mutant strain induced the production of significantly higher levels of IL-8 and significantly lower levels of IL-1β.
  
  
  CONCLUSIONS
  Our data suggest that P. gingivalis HmuY may be considered an immunogenic protein associated with host-pathogen interactions.
authors.affiliation: Federal University of Bahia, Salvador, Brazil Feira de Santana State University, Feira de Santana, Brazil. soraya@uefs.br
authors.forename: S C
authors.initials: SC
authors.lastname: Trindade
authors.forename: T
authors.initials: T
authors.lastname: Olczak
authors.forename: I S
authors.initials: IS
authors.lastname: Gomes-Filho
authors.forename: L F
authors.initials: LF
authors.lastname: Moura-Costa
authors.forename: E M M
authors.initials: EM
authors.lastname: Cerqueira
authors.forename: M
authors.initials: M
authors.lastname: Galdino-Neto
authors.forename: H
authors.initials: H
authors.lastname: Alves
authors.forename: P C
authors.initials: PC
authors.lastname: Carvalho-Filho
authors.forename: M T
authors.initials: MT
authors.lastname: Xavier
authors.forename: R
authors.initials: R
authors.lastname: Meyer
mesh_terms: D000328:Adult; D000942:Antigens, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology*; D015153:Blotting, Western; D002352:Carrier Proteins / Q000235:genetics / Q000276:immunology*; D055113:Chronic Periodontitis / Q000097:blood / Q000276:immunology; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D017353:Gene Deletion; D000081062:Heme-Binding Proteins; D006420:Hemeproteins / Q000235:genetics / Q000276:immunology*; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood / Q000276:immunology; D007074:Immunoglobulin G / Q000097:blood / Q000276:immunology*; D016753:Interleukin-10 / Q000276:immunology*; D053583:Interleukin-1beta / Q000276:immunology*; D016209:Interleukin-8 / Q000276:immunology*; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008070:Lipopolysaccharides / Q000276:immunology; D008297:Male; D016966:Porphyromonas gingivalis / Q000235:genetics / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D002352:Carrier Proteins; D000081062:Heme-Binding Proteins; D006420:Hemeproteins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D053583:Interleukin-1beta; D016209:Interleukin-8; D008070:Lipopolysaccharides; D016753:Interleukin-10