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Updated: Sep 20, 2025

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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Does Oral Endotoxin Contribute to Systemic Inflammation?

Camille Zenobia1, Richard P Darveau2

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The oral microbiome, particularly Porphyromonas gingivalis, is linked to systemic inflammatory diseases. Oral bacteria and their endotoxins influence neutrophil activity, impacting blood microbiome composition and systemic health.

Keywords:
Porphyromonas gingivalisgut dysbiosismetabolic endotoxemiaperiodontal diseasesystemic inflammation

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Area of Science:

  • Oral microbiology
  • Immunology
  • Systemic inflammation

Background:

  • The oral microbiome, especially Porphyromonas gingivalis, is implicated in various inflammatory diseases.
  • Periodontal disease can lead to a

Purpose of the Study:

  • To review the connection between oral health and systemic inflammatory diseases.
  • To emphasize the role of the oral microbiome and lipopolysaccharides in immune tolerance and activation.

Main Methods:

  • Literature review synthesizing studies on oral health, microbiome, and inflammatory diseases.
  • Focus on Porphyromonas gingivalis and its impact on neutrophil activity and endotoxin tolerance.

Main Results:

  • Oral bacteria are a significant source of the blood microbiome.
  • Oral health status and microbial endotoxins modulate neutrophil phenotypes and immune tolerance.
  • Alterations in the blood microbiome and neutrophil phenotypes are observed in systemic inflammatory conditions.

Conclusions:

  • The oral microbiome plays a critical role in systemic inflammation.
  • Mechanisms involving neutrophil manipulation and endotoxin tolerance link oral health to systemic diseases.
  • Further research into oral-microbial interactions is crucial for understanding and treating inflammatory conditions.