title: Associations between serum antibody levels to periodontal pathogens and early-onset periodontitis.
abstract: BACKGROUND
  The role of antibodies to periodontal microorganisms in the development of periodontal tissue destruction is still unclear. The aim of this study was to investigate the association between serum levels of IgG, IgA, and IgM antibodies to 6 periodontal microorganisms and clinical subtypes of varying severity of early-onset periodontitis (EOP) in young African American adults.
  
  
  METHODS
  The study group consisted of 159 African Americans aged 19 to 25 years (mean 22 years) and included 97 cases with EOP and 62 controls with no clinical signs of EOP. These subjects were selected from a nationally representative sample of adolescents who received an oral examination as part of the National Survey of Oral Health of United States Children in 1986-1987. The group was examined clinically a second time 6 years later and blood samples were collected. Serum levels of IgG, IgA, and IgM reactive to Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, Campylobacter rectus, Eikenella corrodens, and Fusobacterium nucleatum were assessed.
  
  
  RESULTS
  Serum levels of IgG and IgA antibody reactive to P. gingivalis and A. actinomycetemcomitans and IgA antibody to P. intermedia were significantly higher in generalized EOP cases compared to healthy controls. IgM antibody levels did not show any significant associations with EOP for any of the 6 bacterial species tested. There were no significant differences in antibody levels between controls and the 13 subjects in our study who were classified with localized EOP.
  
  
  CONCLUSIONS
  The findings suggest that antibodies to P. gingivalis, P. intermedia, and A. actinomycetemcomitans may play a significant role in the pathogenesis of EOP. Substantial longitudinal studies that monitor antibody levels and avidity prior to disease onset, during progression, and following clinical intervention will be necessary to fully understand the role of this component of the immune response in protection versus tissue destruction and the potential use in EOP risk assessment and disease management.
authors.affiliation: Temple University School of Dentistry, Department of Periodontology, Philadelphia, PA 19140, USA. jalbandar@dental.temple.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Albandar
authors.forename: A M
authors.initials: AM
authors.lastname: DeNardin
authors.forename: M R
authors.initials: MR
authors.lastname: Adesanya
authors.forename: S R
authors.initials: SR
authors.lastname: Diehl
authors.forename: D M
authors.initials: DM
authors.lastname: Winn
mesh_terms: D000293:Adolescent; D000328:Adult; D016976:Aggregatibacter actinomycetemcomitans / Q000276:immunology; D010520:Aggressive Periodontitis / Q000276:immunology / Q000382:microbiology*; D000704:Analysis of Variance; D000907:Antibodies, Bacterial / Q000097:blood*; D044383:Black People; D002167:Campylobacter / Q000276:immunology; D016022:Case-Control Studies; D016124:Eikenella corrodens / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005500:Follow-Up Studies; D016967:Fusobacterium nucleatum / Q000276:immunology; D006090:Gram-Negative Bacteria / Q000276:immunology*; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood; D007074:Immunoglobulin G / Q000097:blood; D007075:Immunoglobulin M / Q000097:blood; D016014:Linear Models; D008297:Male; D017622:Periodontal Attachment Loss / Q000276:immunology / Q000382:microbiology; D016966:Porphyromonas gingivalis / Q000276:immunology; D018713:Prevotella intermedia / Q000276:immunology; D001741:Black or African American
chemical_list: D000907:Antibodies, Bacterial; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M