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Adhesion of Actinomyces Isolates to Experimental Pellicles

Department of Dental Research, Rochester Caries Research Center, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642

L.K. Kopec

Department of Dental Research, Rochester Caries Research Center, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642

W.H. Bowen

Department of Dental Research, Rochester Caries Research Center, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642

The ability of oral bacteria to adhere to surfaces is associated with their pathogenicity. Actinomyces can adhere to pellicle and cells through extracellular fimbriae. Research on adhesion of actinomyces has been conducted with use of hydroxyapatite (HA) coated with mammalian-derived salivary constituents, whereas the bacterial-derived components of the acquired pellicle have been largely ignored. The influence of the cell-free bacterial enzyme, glucosyltransferase (GTF), on adhesion of human and rodent isolates of Actinomyces viscosus was examined. Cell-free GTF was adsorbed onto parotid saliva-coated hydroxyapatite (sHA). Next, A. viscosus was exposed to the pellicle following the synthesis of glucan formed in situ by GTF. Glucans formed on the pellicle served as binding sites for adhesion of a rodent strain ofA. viscosus. Conversely, the presence of in situ glucans on sHA reduced the adhesion of human isolates of A. uiscosus compared with their adhesion to sHA. Adhesion of the rodent strains may be facilitated through a dextran-binding protein, since the rodent strains aggregated in the presence of dextrans and mutan. The human isolates were not aggregated by dextran or mutan. Pellicle harboring A. viscosus rodent strains interfered with the subsequent adhesion of Streptococcus mutans to the bacterial-coated pellicle. In contrast, the adhesion of S. mutans to pellicle was not decreased when the pellicle was pre-exposed to a human isolate ofA. viscosus. The experimental data suggest that human and the rodent isolates of A. viscosus have distinct glucan adhesion properties. Moreover, these results emphasize the role of in situ glucans in bacterial adhesion to the acquired pellicle by promoting selective adherence of bacteria or by masking potential binding sites for others.

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Journal of Dental Research, Vol. 72, No. 6, 1015-1020 (1993)
DOI: 10.1177/00220345930720060401


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