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Oxidative Stress Inhibits Endotoxin Tolerance and May Affect Periodontitis.

T Yamaguchi1,2, Y Yamamoto1, K Egashira1

  • 1R&D Headquarters, LION Corporation, Tokyo, Japan.

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|December 19, 2022
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Summary

Oxidative stress impairs endotoxin tolerance in macrophages, potentially worsening periodontal disease progression. This study reveals a new mechanism linking oxidative stress to periodontitis by inhibiting immune cell tolerance to bacterial endotoxins.

Keywords:
Toll-like receptorsimmunomodulationinflammationlipopolysaccharidesmacrophagesperiodontal diseasesreactive oxygen species

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Area of Science:

  • Oral biology
  • Immunology
  • Oxidative stress research

Background:

  • Periodontal disease stems from dental biofilm dysbiosis and host inflammation.
  • Bacterial factors like lipopolysaccharides (LPS) drive disease, while endotoxin tolerance in myeloid cells modulates inflammation and regeneration.
  • The impact of oxidative stress and endotoxin tolerance on periodontitis is not fully understood.

Purpose of the Study:

  • To investigate the effect of oxidative stress on endotoxin tolerance.
  • To determine how endotoxin tolerance influences periodontitis progression.
  • To elucidate the role of oxidative stress in regulating endotoxin tolerance in periodontitis.

Main Methods:

  • In vitro analysis of mouse peritoneal macrophages exposed to hydrogen peroxide (H2O2) and Porphyromonas gingivalis LPS.
  • Establishment of a novel oxidative stress mouse model (SMP30KO mice) for in vivo studies.
  • Assessment of gingival gene expression and ligature-induced periodontitis severity.

Main Results:

  • Oxidative stress inhibits LPS-induced endotoxin tolerance in macrophages, partly by downregulating Toll-like receptor (TLR) signaling negative regulators.
  • In vivo, oxidative stress impairs macrophage endotoxin tolerance potential.
  • The oxidative stress model showed decreased expression of endotoxin tolerance genes and aggravated periodontitis symptoms.

Conclusions:

  • Oxidative stress may exacerbate periodontitis by inhibiting endotoxin tolerance.
  • Downregulation of TLR signaling negative regulators is a potential mechanism.
  • Findings suggest a novel link between oxidative stress, immune tolerance, and periodontal disease progression.