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Journal of Dental Research
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Water-insoluble Glucan Synthesis by Mutans Streptococcal Strains Correlates with Caries Incidence in 12- to 30-month-old Children

R.O. Mattos-Graner

Department of Pediatric Dentistry, Faculty of Odontology of São Paulo, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestcs, 1374-Cidade Universitaria, CEP 05508-900 Sao Paulo, SP, Brazil

D.J. Smith

Department of Immunology, The Forsyth Institute, Boston, MA, USA

W.F. King

Department of Immunology, The Forsyth Institute, Boston, MA, USA

M.P.A. Mayer

Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestcs, 1374-Cidade Universitaria, CEP 05508-900 Sao Paulo, SP, Brazil, mpamayer{at}icb.usp.br

Early mutans streptococci (MS) infection has been associated with higher caries activity in childhood. Since colonization with MS does not always lead to caries activity, additional factors may be involved in MS cariogenicity. For example, MS may differ in virulence traits such as the potential to synthesize glucan polymers from sucrose. In the present study, we tested the hypothesis that caries activity can be associated with variations in virulence factor expression of MS-infecting strains. At baseline, levels of MS obtained by the tongue-blade sampling method, and the presence of visible plaque on upper incisors, were measured in 101 12- to 30-month-old children. Dental caries lesions were diagnosed at baseline and after one year. Caries incidence data were then used to select ten caries-free and nine caries-active children from whom a total of 20 MS fresh isolates was studied. Water-insoluble glucan (WIG) synthesis, final pH, and sucrose-dependent adherence on glass surfaces were measured in these MS isolates. Concentrated culture supernatants were separated in duplicate SDS-PAGE gels, which were then either stained for protein or incubated with 5% sucrose. The intensities of the WIG bands developed in the 5% sucrose PAGE gels and the corresponding protein-stained GTF bands were measured by scanning densitomctry. High MS levels (≥ 100 CFU) were associated with high caries incidence (p < 0.01). The presence of visible plaque did not correlate with caries incidence. The intensities of WIG bands were positively correlated with caries incidence (p < 0.05) and with the ability of MS to adhere to glass surfaces (p < 0.05). Analysis of our data suggests that the ability to synthesize WIG is an important virulence factor in initial caries development by increasing MS adherence and accumulation in the plaque of young children.

Key Words: mutans streptococci • glucosyltransferase • dental caries • dental plaque • infant.

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Journal of Dental Research, Vol. 79, No. 6, 1371-1377 (2000)
DOI: 10.1177/00220345000790060401
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