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Related Experiment Video

Updated: Jul 13, 2026

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils
07:15

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

Published on: January 21, 2020

Neutrophil hyper-responsiveness in periodontitis.

J B Matthews1, H J Wright, A Roberts

  • 1Periodontal Research Group, School of Dentistry, University of Birmingham, St Chad's Queensway, Birmingham B4 6NN, UK. j.b.matthews@bham.ac.uk

Journal of Dental Research
|July 27, 2007
PubMed
Summary

Chronic periodontitis causes neutrophil overactivity, leading to excess reactive oxygen species (ROS). Non-surgical therapy reduced ROS production, but some constitutive extracellular ROS release persisted, indicating dual mechanisms.

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Last Updated: Jul 13, 2026

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06:14

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Area of Science:

  • Immunology
  • Oral Biology
  • Biochemistry

Background:

  • Chronic periodontitis is linked to heightened neutrophil activity and excessive reactive oxygen species (ROS) production.
  • Understanding the nature (constitutive vs. reactive) of this neutrophil hyper-responsiveness is crucial for targeted therapies.

Purpose of the Study:

  • To investigate whether neutrophil hyper-responsiveness in chronic periodontitis is constitutive or reactive.
  • To evaluate the impact of non-surgical periodontal therapy on neutrophil ROS production.

Main Methods:

  • Peripheral blood neutrophils from patients with chronic periodontitis (n=19) and controls were analyzed before and after non-surgical therapy.
  • Neutrophils were stimulated via Fc gamma-receptor, with or without priming by P. gingivalis and F. nucleatum.
  • Total and extracellular ROS generation was quantified using luminol/isoluminol chemiluminescence.

Main Results:

  • Patients' neutrophils exhibited significantly higher total ROS generation compared to controls (P=0.016), which remained elevated post-therapy (P=0.059).
  • Non-surgical therapy reduced Fc gamma-receptor-stimulated total ROS production.
  • Unstimulated extracellular ROS production by patients' neutrophils remained high post-therapy and was unaffected by priming, suggesting a constitutive component.

Conclusions:

  • Neutrophil hyper-responsiveness in chronic periodontitis involves both constitutive and reactive mechanisms.
  • Non-surgical therapy partially ameliorates ROS overproduction, but constitutive extracellular ROS release persists, highlighting the complexity of this condition.