Serotype-specific opsonization of Treponema hyodysenteriae
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Updated: Aug 24, 2026
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Published on: September 25, 2014
Abstract:
Treponema hyodysenteriae was shown to attach to mouse peritoneal cells in the absence of serum opsonins in vitro. If serotype-specific antiserum from pigs was added to the media and treponemes of that corresponding serotype were employed in the assay, the amount of attachment increased an average of 3.7 times that of the control without pig sera. However, the amount of attachment was increased an average of only 1.5 times that of the control if organisms of any noncorresponding serotype of T. hyodysenteriae were used in the assay. Since the lipopolysaccharide (LPS) extracted from T. hyodysenteriae is the basis for serotyping the treponeme, the ability of these distinct LPS types to block attachment by blocking opsonization of the organisms was tested. Attachment, using corresponding antisera and treponemes, was blocked by LPS extracted from treponemes of that serotype, but not by LPS extracted from treponemes of other serotypes. These results indicate that antibody response to T. hyodysenteriae infection in pigs is serotype-specific. Furthermore, since opsonization and subsequent attachment of bacteria to phagocytes is known to be a protective mechanism, we suggest that the LPS may be an important antigen in the stimulation of host defense against the treponeme.
Insights
The study found that pig antibodies against Treponema hyodysenteriae are serotype-specific. Lipopolysaccharide (LPS) plays a key role in stimulating host defense against this bacterial infection.
Area of Science:
- Veterinary immunology
- Bacteriology
- Microbial pathogenesis
Background:
- Treponema hyodysenteriae causes swine dysentery.
- Understanding host-pathogen interactions is crucial for developing effective treatments.
- Serological specificity influences immune responses to bacterial infections.
Purpose of the Study:
- To investigate the serotype specificity of antibody responses to Treponema hyodysenteriae.
- To determine the role of lipopolysaccharide (LPS) in the opsonization and attachment of T. hyodysenteriae to host cells.
Main Methods:
- In vitro attachment assays using mouse peritoneal cells and T. hyodysenteriae.
- Inclusion of serotype-specific pig antisera and lipopolysaccharide (LPS) extracts.
- Quantification of treponeme attachment to phagocytic cells.
Main Results:
- Attachment of T. hyodysenteriae to mouse peritoneal cells was significantly enhanced by homologous (serotype-specific) pig antiserum.
- Heterologous antisera showed a much lower enhancement of attachment.
- LPS from a specific serotype blocked homologous antibody-mediated attachment, indicating serotype-specific opsonization.
Conclusions:
- Antibody responses to T. hyodysenteriae infection in pigs are serotype-specific.
- The lipopolysaccharide (LPS) of T. hyodysenteriae is a critical antigen involved in serotype-specific opsonization.
- LPS may be important for stimulating host defense mechanisms against T. hyodysenteriae.
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