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Oral Microbiology and Immunology

Effect of Human Saliva on Glucose Uptake by Streptococcus mutans and Other Oral Microorganisms

Greg R. Germaine, Lois M. Tellefson
Greg R. Germaine
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Lois M. Tellefson
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ABSTRACT

We examined the effects of human whole salivary supernatant and parotid fluid on glucose uptake by Streptococcus mutans, Streptococcus sanguis, Streptococcus mitis, Actinomyces viscosus, Staphylococcus aureus, and Escherichia coli. The following three effects of saliva were observed: (i) inhibition of glucose uptake (S. mutans, S. sanguis), (ii) promotion of a transient, rapid (0 to 30 s) burst of glucose uptake (S. mutans, S. sanguis), and (iii) enhancement of glucose uptake (S. mitis, A. viscosus, S. aureus, E. coli). We observed no differences between the effects of whole salivary supernatant and the effects of parotid fluid. Heat treatment (80°C, 10 min) of saliva or the addition of dithiothreitol abolished inhibition of glucose uptake. Supplementation of saliva with H2O2 potentiated inhibition of glucose uptake. S. mitis and A. viscosus, which were stimulated by saliva alone, were inhibited by H2O2-supplemented saliva; 50% inhibition of glucose uptake by S. mutans and S. mitis required ca. 10 μM H2O2 in 50% (vol/vol) saliva. Loss of the inhibitory action of saliva occurred at about 5% (vol/vol) saliva. Supplementation of saliva dilutions with SCN− and H2O2 extended the inhibitory activity to solutions containing ca. 0.2% (vol/vol) saliva. We suggest that the salivary lactoperoxidase-SCN−-H2O2 system is responsible for the inhibitory activity of saliva reported here. Furthermore, we concluded that lactoperoxidase and SCN− are present in saliva specimens in concentrations that exceed minimal inhibitory levels by factors of ca. 500 and 10 to 20, respectively. The resistance of A. viscosus, S. aureus, and E. coli to the inhibitory potential of saliva alone was probably due to the production of catalase by these organisms. The resistance of S. mitis may have been due to special effects of saliva on H2O2 accumulation by this organism compared with S. mutans and S. sanguis. The basis of saliva-dependent enhancement of glucose uptake and the basis of promotion of a transient, rapid burst of glucose uptake are unknown. The role of the salivary lactoperoxidase-SCN−-H2O2 system in the oral microbial ecosystem is discussed.

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Effect of Human Saliva on Glucose Uptake by Streptococcus mutans and Other Oral Microorganisms
Greg R. Germaine, Lois M. Tellefson
Infection and Immunity Feb 1981, 31 (2) 598-607; DOI:

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Effect of Human Saliva on Glucose Uptake by Streptococcus mutans and Other Oral Microorganisms
Greg R. Germaine, Lois M. Tellefson
Infection and Immunity Feb 1981, 31 (2) 598-607; DOI:
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