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Commensal bacteria influence innate status within gingival tissues: a pilot study
Douglas R Dixon1, Robert A Reife, John J Cebra
1United States Army Dental Corps and Department of Periodontics and Oral Biology, University of Washington, School of Dentistry, Seattle, WA, USA.
Journal of Periodontology
|January 7, 2005
Summary
Commensal bacteria significantly impact the innate immune response in mouse gums. While IL-1beta mRNA decreases with bacteria, protein levels increase, showing microbial influence on periodontal defense.
Area of Science:
- Microbiology and Immunology
- Oral Biology
- Host-Microbe Interactions
Background:
- Commensal bacteria play a role in the innate immune defense of gingival tissues.
- Understanding this interaction is crucial for comprehending periodontal health.
- Previous research has not fully elucidated the specific mediators involved.
Purpose of the Study:
- To determine how commensal bacteria influence the innate defense status of gingival tissue.
- To examine the expression of key innate host defense mediators.
- To compare these mediators in germ-free versus conventionally reared mice.
Main Methods:
- Utilized semiquantitative reverse transcription-polymerase chain reaction (RT-PCR) for mRNA analysis.
- Quantified E-selectin, P-selectin, IL-8 homologue, TNF-alpha, IL-1beta, ICAM-1, ICAM-2, and VCAM-1.
- Determined IL-1beta protein content using enzyme-linked immunosorbent assay (ELISA).
Main Results:
- Interleukin-1 beta (IL-1beta) mRNA expression was significantly reduced in conventionally reared mice compared to germ-free mice (P<0.01).
- Conversely, IL-1beta protein levels were significantly higher in conventionally reared mice (P<0.001).
- This pattern of reduced IL-1beta mRNA and increased protein was consistent in both BALBc/ByJ and SCID C.B17 mouse models.
Conclusions:
- Commensal microbial colonization significantly influences IL-1beta expression.
- This influence occurs at both mRNA and protein levels in healthy mouse periodontal tissue.
- Findings highlight the complex role of microbiota in maintaining oral tissue homeostasis.