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. 1991 Jan;59(1):102–108. doi: 10.1128/iai.59.1.102-108.1991

Adherence of Porphyromonas (Bacteroides) gingivalis to Streptococcus sanguis in vitro.

M W Stinson 1, K Safulko 1, M J Levine 1
PMCID: PMC257711  PMID: 1987021

Abstract

Intergeneric bacterial adherence is responsible for the complexity of the microbiota in human dental plaque and is believed to enable some extraneous bacteria to initially colonize the human oral cavity. Some current evidence indicates that Streptococcus sanguis, an early colonizer of teeth, enhances subsequent colonization by Porphyromonas (Bacteroides) gingivalis, a bacterium associated with advanced adult periodontitis. In this study, selected strains of P. gingivalis and S. sanguis were tested for their adherence activities in vitro. A differential filtration assay was devised in which one member of the test pair was radiolabeled. Heterogeneous aggregates that formed in mixed suspensions were collected on polycarbonate filters (8-microns pore size) and were washed free of individual bacteria and small homologous clumps. P. gingivalis 381, W50, JKG7, and 33277 adhered to S. sanguis G9B, M5, Challis 6, and 38. P. gingivalis A7A1-28 did not adhere well to S. sanguis under these conditions. More precise measurements of intergeneric adherence were obtained with an alternative assay with radiolabeled P. gingivalis and an artificial dental plaque composed of S. sanguis coupled to cyanogen bromide-activated agarose beads. CNBr-agarose was selected as the supporting matrix for the plaque because it was uniformly and permanently coated with S. sanguis and because P. gingivalis had negligible adherence activity for streptococcus-free beads. P. gingivalis W50 grown to the early stationary phase adhered to S. sanguis-coated beads in higher numbers than either midlogarithmic- or late-stationary-phase cells. Intergeneric adherence was not inhibited or reversed by the presence of lactose or other monosaccharides or disaccharides. Pretreatment of either bacterium with trypsin or proteinase K reduced subsequent adherence by 86 to 100%. Neuraminidase treatment of P. gingivalis caused 98% reduction of adherence, whereas similar treatment of S. sanguis caused only a 2% loss. Preincubation of P. gingivalis at 60 degrees C for 30 min decreased subsequent adherence to S. sanguis-coated beads by 94%. Adherence was reduced by 96% when bacteria were assayed while suspended in human whole saliva or when pretreated with saliva and subsequently assayed in buffer. The concentration of whole human saliva required to inhibit 50% adherence in this assay was 23 micrograms per ml (1:200 dilution). Suspension of the bacteria in normal rabbit serum resulted in 94% inhibition of adherence. These data indicate that saliva and serum may be important host defense factors for controlling Porphyromonas-Streptococcus adherence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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