title: Real-time interaction of oral streptococci with human salivary components.
abstract: Oral streptococci are present in large numbers in dental plaque and several types interact with the enamel salivary pellicle to form a biofilm on tooth surfaces. The respective affinity of individual streptococci for salivary components has an influence on the etiologic properties of oral biofilm in the development of dental caries. We studied real-time biospecific interactions between oral streptococci and salivary components utilizing biosensor technology to analyze surface plasmon resonance. Streptococcus sanguis and Streptococcus mutans showed significant responses for binding to salivary components, in comparison with other bacteria. Further, the association rates (4.1 x 10-11/bacterium) and dissociation rate (5.7 +/- 0.9 x 10-3 Second(s)-1) were higher for S. sanguis than for S. mutans (2.4 x 10-11 and 2.9 +/- 0.8 x 10-3) and Streptococcus mitis (1.3 x 10-11 and 3.5 +/- 1.3 x 10-3). However, the association equilibrium constants (8.2 S/bacterium) for S. mutans was 2 times higher in than S. mitis (3.8) and slightly higher than S. sanguis (7.2). These findings may provide useful information regarding the mechanism of early biofilm formation by streptococci on the tooth surface.
authors.affiliation: Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kawashima
authors.forename: N
authors.initials: N
authors.lastname: Hanada
authors.forename: T
authors.initials: T
authors.lastname: Hamada
authors.forename: J
authors.initials: J
authors.lastname: Tagami
authors.forename: H
authors.initials: H
authors.lastname: Senpuku
mesh_terms: D000328:Adult; D018441:Biofilms / Q000254:growth & development; D015374:Biosensing Techniques / Q000295:instrumentation*; D044622:Dental Pellicle; D003773:Dental Plaque / Q000382:microbiology*; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D011485:Protein Binding; D012471:Salivary Proteins and Peptides / Q000378:metabolism*; D013291:Streptococcus / Q000378:metabolism*; D034361:Streptococcus mitis / Q000378:metabolism; D013295:Streptococcus mutans / Q000378:metabolism; D013298:Streptococcus sanguis / Q000378:metabolism
chemical_list: D012471:Salivary Proteins and Peptides