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Related Experiment Videos

Polymicrobial periodontal pathogen transcriptomes in calvarial bone and soft tissue.

V Bakthavatchalu1, A Meka, J J Mans

  • 1Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA.

Molecular Oral Microbiology
|September 8, 2011
PubMed
Summary

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The Oral Microbiota01:27

The Oral Microbiota

The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...

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This study reveals how a combination of three key periodontal pathogens triggers significant gene expression changes in bone and tissue, impacting inflammation and bone resorption pathways.

Area of Science:

  • Oral microbiology
  • Immunology
  • Genomics

Background:

  • Adult periodontitis is linked to specific bacteria like Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia.
  • Understanding the host response to these pathogens in combination is crucial for periodontitis research.

Purpose of the Study:

  • To investigate the host transcriptome response to a polymicrobial infection involving P. gingivalis, T. denticola, and T. forsythia.
  • To analyze gene expression changes in calvarial bone and associated soft tissues during acute inflammation and bone resorption.

Main Methods:

  • A murine calvarial model was used to simulate polymicrobial infection.
  • Murine GeneChip array analysis was performed on excised calvarial bones and inflamed tissues.
  • Quantitative real-time RT-PCR validated microarray findings.

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Main Results:

  • Polymicrobial infection significantly altered gene expression in both calvarial bone (6997 genes) and soft tissues (1544 genes).
  • Key affected pathways included leukocyte transendothelial migration, cell adhesion, and extracellular matrix interactions, leading to cytokine/chemokine stimulation.
  • Increased inflammation and osteoclast activity were observed compared to controls.

Conclusions:

  • This study provides the first comprehensive transcriptome analysis of a polymicrobial periodontal pathogen infection in calvarial bone and soft tissue.
  • The polymicrobial infection uniquely regulates specific pathways, distinct from mono-infections, highlighting the complexity of periodontitis pathogenesis.