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Antibody specificity and antigen characterization of rat monoclonal antibodies against Streptococcus mutans cell
Abstract:
Monoclonal antibodies to Streptococcus mutans OMZ175 (serotype f) cell wall-associated antigens (wall-extracted antigens [WEA]) were derived from the fusion of Lou C plasmocytoma rat cells (IR 983 F) and spleen cells from Wistar R inbred rats immunized with WEA. Four cell lines producing monoclonal antibodies directed against a component of S. mutans WEA have been established. All four monoclonal antibodies reacted only with two antigens of WEA from S. mutans OMZ175 by Western blotting and immunoprecipitation techniques, enzyme-linked immunosorbent assay (ELISA), and competitive ELISA. Western blot analysis of WEA showed that the four monoclonal antibodies recognized two related cell wall-associated proteins with apparent molecular weights of 125,000 and 76,000. Immunoprecipitation of whole cells with the monoclonal antibodies confirmed the surface localization of the two antigens. The ELISA and competitive ELISA were used to analyze the distribution of the epitopes on seven S. mutans serotypes. All S. mutans serotypes were found to express the recognized epitopes; however, different reactivity patterns could be distinguished among the various strains tested, and the four monoclonal antibodies reacted only weakly with S. mutans serotypes d and g.
Insights
Researchers developed monoclonal antibodies targeting Streptococcus mutans cell wall antigens. These antibodies identified two specific surface proteins present across multiple S. mutans serotypes, aiding in understanding bacterial surface structures.
Area of Science:
- Immunology
- Microbiology
- Molecular Biology
Background:
- Streptococcus mutans is a primary cause of dental caries.
- Understanding S. mutans cell wall antigens is crucial for developing targeted interventions.
- Previous studies have focused on various S. mutans components, but specific monoclonal antibodies against cell wall-associated antigens are needed.
Purpose of the Study:
- To generate and characterize monoclonal antibodies against cell wall-extracted antigens (WEA) of Streptococcus mutans OMZ175 (serotype f).
- To identify and analyze the specific antigens recognized by these monoclonal antibodies.
- To investigate the distribution of these antigens across different S. mutans serotypes.
Main Methods:
- Production of monoclonal antibodies through hybridoma technology (fusion of Lou C plasmocytoma rat cells and spleen cells from immunized Wistar R rats).
- Characterization of antibody-antigen interactions using Western blotting, immunoprecipitation, enzyme-linked immunosorbent assay (ELISA), and competitive ELISA.
- Analysis of antigen molecular weights and surface localization.
Main Results:
- Four stable cell lines producing monoclonal antibodies against S. mutans WEA were established.
- All antibodies recognized two related cell wall-associated proteins (125,000 and 76,000 apparent molecular weights).
- These antigens were confirmed to be surface-localized and expressed by all tested S. mutans serotypes, with varying reactivity patterns, notably weak reactions with serotypes d and g.
Conclusions:
- Monoclonal antibodies were successfully generated against specific S. mutans cell wall proteins.
- These antibodies are valuable tools for identifying and studying surface antigens of Streptococcus mutans.
- The identified antigens are broadly distributed among S. mutans serotypes, suggesting their potential role in broader S. mutans biology and pathogenesis.