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Interaction of Salivary Fibronectin with Oral Streptococci

Department of General Dentistry, The University of Tennessee, The Health Science Center, 894 Union Avenue, 201 Nash, Memphis, Tennessee 38163

M.K. Dabbous

Department of Biochemistry, The University of Tennessee, The Health Science Center, 894 Union Avenue, 201 Nash, Memphis, Tennessee 38163, Department of Periodontics, The University of Tennessee, The Health Science Center, 894 Union Avenue, 201 Nash, Memphis, Tennessee 38163

Immunoreactive Fibronectin (Fn) has been demonstrated in stimulated human parotid saliva by western blot analysis and also found to be a component of the artificial tooth pellicles derived from hydroxyapatite (HA) beads coated with parotid saliva. Saliva depleted of gelatin-binding components showed a significantly lower degree of reactivity with anti-Fn antibodies than did the control saliva when tested by an enzyme-linked immunosorbent assay (ELISA). Depletion of gelatin-binding components from saliva was also found to affect the degree of saliva-mediated aggregation of four of the seven oral streptococci tested [Streptococcus mutans strains GS-5 and OMZ 176, S. sobrinus, and S. rattus]. Similarly, the adherence of the same four micro-organisms to the artificial tooth pellicles (derived from saliva which had previously been depleted of gelatin-binding component) was significantly inhibited ( 37-53%) when compared with the control saliva-coated HA beads. Pre-treatment of streptococci with 100 µg of soluble Fn also caused a 34—57% inhibition of adherence of the same oral streptococci to saliva-treated HA beads. Quantitation of Fn in human parotid saliva showed that the amounts of immunoreactive Fn varied from 2 to 6 µg/mL of parotid saliva. Furthermore, the Fn from parotid saliva was found to be adsorbed onto the bacterial surfaces, as demonstrated by immunofluorescence and ELISA. The presence of Fn in parotid saliva and its ability to bind to HA beads (artificial pellicles), in conjunction with the ability of soluble Fn to inhibit the adherence of streptococcal strains to the artificial tooth pellicles, suggest that the microbial ecology of the oral cavity may, in part, be influenced by the interactions mediated by salivary fibronectin.

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Journal of Dental Research, Vol. 65, No. 8, 1094-1100 (1986)
DOI: 10.1177/00220345860650081001


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