Coaggregation between Porphyromonas gingivalis and Tannerella forsythia.
10.5051/jkape.2006.36.1.265
- Author:
Heung Sik UM
1
;
Seok Woo LEE
;
Jae Hong PARK
;
R K NAUMAN
Author Information
1. Department of Periodontology, College of Dentistry, Kangnung National University, Korea.
- Publication Type:Original Article
- Keywords:
Tannerella forsythia;
Porphyromonas gingivalis;
coaggregation
- MeSH:
Bacteria;
Biofilms;
Carbohydrates;
Dental Plaque;
Forsythia*;
Hand;
Hot Temperature;
Humans;
Periodontal Diseases;
Porphyromonas gingivalis*;
Porphyromonas*
- From:The Journal of the Korean Academy of Periodontology
2006;36(1):265-272
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Dental plaque, a biofilm consisting of more than 500 different bacterial species, is an etiological agent of human periodontal disease. It is therefore important to characterize interactions among periodontopathic microorganisms in order to understand the microbial pathogenesis of periodontal disease. Previous data have suggested a synergistic effect of tow major periodontal pathogens Porphyromonas gingivalis and Tannerella forsythia in the periodontal lesion. In the present study, to better understand interaction between P. gingivalis and T. forsythia, the coaggregation activity between these bacteria was characterized. The coaggregation activity was observed by a direct visual assay by mixing equal amount (1 x 10(9)) of T. forsythia and P. gingivalis cells. It was found that the first aggregates began to appear after 5-10 min, and that the large aggregates completely settled within 1 h. Electron and epifluorescence microscopic studies confirmed cell-cell contact between two bacteria. The heat treatment of P. gingivalis completely blocked the activity, suggesting an involvement of a heat-labile component of P. gingivalis in the interaction. On the other hand, heat treatment of T. forsythia significantly increased the coaggregation activity; the aggregates began to appear immediately. The coaggregation activity was inhibited by addition of protease, however carbohydrates did not inhibit the activity, suggesting that coaggregation is a protein-protein interaction. The results of this study suggest that coaggregation between P. gingivalis and T. forsythia is a result of cell-cell physical contact, and that coaggregation is mediated by a heat-labile component of P. gingivalis and T. forsythia component that can be activated on heat treatment.
