Related Experiment Videos
Host responses in patients with generalized refractory periodontitis
E Hernichel-Gorbach1, K S Kornman, S C Holt
1Department of Periodontics, University of Texas Health Science Center at San Antonio.
Journal of Periodontology
|January 1, 1994
Summary
Refractory periodontitis patients show altered immune responses. Their monocytes exhibit decreased Mo3e receptor upregulation and altered T-cell ratios after lipopolysaccharide challenge, indicating a distinct biologic profile.
Area of Science:
- Immunology
- Periodontology
- Cell Biology
Background:
- Refractory periodontitis lacks a defined biologic profile.
- Understanding host immune response is crucial for managing this condition.
Purpose of the Study:
- To investigate the host immune responsiveness in refractory periodontitis patients.
- To determine the effect of lipopolysaccharide (LPS) challenge on monocyte receptors and inflammatory mediator release.
Main Methods:
- Blood samples from refractory periodontitis, stable periodontal maintenance, and gingivitis patients were analyzed.
- Mononuclear cells were stimulated with bacterial LPS (Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Salmonella typhimurium).
- Monocyte surface receptor density (Mo3e, LeuM3) and T-cell CD4/CD8 ratios were measured via flow cytometry.
- Prostaglandin-E2 (PGE2) and Interleukin-1 beta (Il-1 beta) release were quantified using ELISA.
Main Results:
- Refractory periodontitis patients showed significantly decreased Mo3e receptor upregulation after P. gingivalis or S. typh LPS stimulation compared to controls.
- A decreased T-cell CD4/CD8 ratio was observed in refractory periodontitis patients.
- Monocytes from stable maintenance and refractory periodontitis patients released higher levels of Il-1 beta and PGE2 upon LPS stimulation than those from gingivitis patients.
Conclusions:
- Refractory periodontitis patients exhibit a unique host immune profile characterized by altered monocyte receptor expression and inflammatory mediator release.
- These findings contribute to understanding the biologic basis of refractory periodontitis and may inform future therapeutic strategies.