The oral microbiome and the immunobiology of periodontal disease and caries

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

The composition of the oral microbiome differs from one intraoral site to another, reflecting in part the host response and immune capacity at each site. By focusing on two major oral infections, periodontal disease and caries, new principles of disease emerge. Periodontal disease affects the soft tissues and bone that support the teeth. Caries is a unique infection of the dental hard tissues. The initiation of both diseases is marked by an increase in the complexity of the microbiome. In periodontitis, pathobionts and keystone pathogens such as Porphyromonas gingivalis appear in greater proportion than in health. As a keystone pathogen, P. gingivalis impairs host immune responses and appears necessary but not sufficient to cause periodontitis. Historically, dental caries had been causally linked to Streptococcus mutans. Contemporary microbiome studies now indicate that singular pathogens are not obvious in either caries or periodontitis. Both diseases appear to result from a perturbation among relatively minor constituents in local microbial communities resulting in dysbiosis. Emergent consortia of the minor members of the respective microbiomes act synergistically to stress the ability of the host to respond and protect. In periodontal disease, host protection first occurs at the level of innate gingival epithelial immunity. Secretory IgA antibody and other salivary antimicrobial systems also act against periodontopathic and cariogenic consortia. When the gingival immune response is impaired, periodontal tissue pathology results when matrix metalloproteinases are released from neutrophils and T cells mediate alveolar bone loss. In caries, several species are acidogenic and aciduric and appear to work synergistically to promote demineralization of the enamel and dentin. Whereas technically possible, particularly for caries, vaccines are unlikely to be commercialized in the near future because of the low morbidity of caries and periodontitis.

Original languageEnglish (US)
Pages (from-to)22-38
Number of pages17
JournalImmunology Letters
Volume162
Issue number2
DOIs
StatePublished - Dec 1 2014

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Periodontitis
Microbiota
Periodontal Diseases
Porphyromonas gingivalis
Tooth
Dysbiosis
Alveolar Bone Loss
Secretory Immunoglobulin A
Streptococcus mutans
Dental Caries
Dentin
Dental Enamel
Infection
Matrix Metalloproteinases
Immunity
Neutrophils
Vaccines
Pathology
Morbidity
T-Lymphocytes

Keywords

  • Caries
  • Microbiome
  • Pathogenesis
  • Periodontitis

Cite this

The oral microbiome and the immunobiology of periodontal disease and caries. / Costalonga, Massimo; Herzberg, Mark C.

In: Immunology Letters, Vol. 162, No. 2, 01.12.2014, p. 22-38.

Research output: Contribution to journalArticle

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