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Oral mucosal immunity.

L Feller1, M Altini, R A G Khammissa

  • 1Department of Periodontology and Oral Medicine, University of Limpopo, Medunsa Campus, Pretoria, South Africa.

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

Oral immune cells differentiate microbes, initiating protective immunity or tolerance. Secretory IgA antibodies prevent pathogen colonization and invasion, crucial for oral mucosal defense.

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Area of Science:

  • Immunology
  • Oral Biology
  • Microbiology

Background:

  • Oral mucosa immune cells, like keratinocytes and dendritic cells, use pattern recognition receptors to identify microorganisms.
  • These cells modulate immune responses, either promoting inflammation against pathogens or inducing tolerance to commensals.
  • Oral immune tolerance involves T cell regulation, either through lack of activation or suppression by regulatory T cells.

Purpose of the Study:

  • To elucidate the mechanisms of microbial recognition and immune response modulation in the oral mucosa.
  • To understand the role of T cells and secretory IgA in maintaining oral immune homeostasis.
  • To explore the factors influencing IgA class switching in the oral environment.

Main Methods:

  • Analysis of molecular pattern recognition receptor (PRR) signaling pathways.
  • Investigation of T cell activation and regulatory mechanisms in response to oral antigens.
  • Assessment of secretory immunoglobulin A (sIgA) antibody functions in mucosal immunity.
  • Study of cytokine-mediated IgA isotype class switching involving dendritic cells and monocytes.

Main Results:

  • Oral immune cells effectively distinguish between commensal and pathogenic microbes.
  • Immune responses are tailored to either eliminate pathogens or establish tolerance to commensals.
  • Secretory IgA plays a key role in preventing microbial colonization and epithelial invasion.
  • IgA class switching is influenced by cytokines from dendritic cells and monocytes, with T cell dependency varying.

Conclusions:

  • The oral mucosa possesses sophisticated mechanisms for microbial surveillance and immune response regulation.
  • Oral immune tolerance and protective immunity are actively maintained through cellular and humoral factors.
  • Secretory IgA is a critical component of oral mucosal immunity, limiting pathogen entry.
  • Dendritic cell and monocyte-derived cytokines are essential for IgA production, highlighting their role in mucosal defense.