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Intranasal immunization against dental caries with a Streptococcus mutans-enriched fimbrial preparation
M Fontana1, A J Dunipace, G K Stookey
1Oral Health Research Institute, Schools of Dentistry and of Medicine, Indiana University, Indianapolis, Indiana 46202-5186, USA. MFONTANA@IUSD.IUPUI.EDU
Clinical and Diagnostic Laboratory Immunology
|May 4, 1999
Summary
A novel mucosal vaccine using Streptococcus mutans surface proteins shows promise for preventing dental caries. Immunization in rats reduced enamel lesions by inducing protective salivary antibodies against this major cavity-causing bacterium.
Area of Science:
- Oral microbiology
- Immunology
- Vaccine development
Background:
- Streptococcus mutans is the primary cause of human dental caries.
- Bacterial attachment to teeth involves surface proteins like glucosyltransferases and fimbriae.
- A mucosal vaccine could induce salivary IgA to block S. mutans adhesion and reduce pathogenesis.
Purpose of the Study:
- To evaluate the efficacy of a mucosal vaccine against S. mutans surface proteins.
- To assess the induction of salivary and serum antibodies following immunization.
- To determine the vaccine's effect on S. mutans colonization and dental lesion formation.
Main Methods:
- Rats were intranasally immunized with S. mutans surface proteins (enriched for fimbriae) conjugated with cholera toxin B subunit (CTB) and cholera toxin (CT).
- Control groups received no immunization or adjuvant (CTB and CT) alone.
- Antibody responses, bacterial counts, and enamel lesion development were assessed.
Main Results:
- Immunized rats exhibited significantly higher salivary IgA and serum IgG antibody responses to S. mutans proteins and cells.
- No significant difference in S. mutans bacterial counts was observed between groups.
- Fewer smooth-surface enamel lesions were found in the immunized group.
Conclusions:
- A mucosal vaccine composed of S. mutans surface proteins, particularly fimbria components, is a promising candidate for preventing dental caries.
- The vaccine effectively elicits protective immune responses, leading to reduced dental lesion development.
- Further research is warranted to explore its potential as a human vaccine.