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Capsular polysaccharide expressed by Pasteurella piscicida grown in vitro
R Bonet1, B Magariños, J L Romalde
1Department de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Spain.
FEMS Microbiology Letters
|December 15, 1994
Summary
Researchers identified and characterized a novel capsular polysaccharide from Pasteurella piscicida. This bacterial capsule is immunogenic and distinct from the O-antigen lipopolysaccharide.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Immunology
Background:
- Pasteurella piscicida is a fish pathogen.
- Bacterial capsules play roles in virulence and immune evasion.
- Understanding capsule composition is crucial for vaccine development.
Purpose of the Study:
- To isolate and characterize the capsular polysaccharide produced by Pasteurella piscicida.
- To determine the immunogenicity of the purified capsular polysaccharide.
- To investigate potential cross-reactivity with other bacterial antigens.
Main Methods:
- Cultivation of Pasteurella piscicida in glucose-rich medium.
- Purification of the capsular polysaccharide.
- Chemical analysis and High-Performance Liquid Chromatography (HPLC) for composition determination.
- Immunization of rabbits and serological cross-reactivity tests.
Main Results:
- A capsule was observed on Pasteurella piscicida using light and electron microscopy.
- The capsular polysaccharide comprised glucose, mannose, N-acetylgalactosamine, galacturonic acid, and acetic acid.
- The polysaccharide demonstrated immunogenicity in rabbits.
- No cross-reactivity was observed with antibodies against the O-antigen lipopolysaccharide.
Conclusions:
- Pasteurella piscicida produces a distinct capsular polysaccharide.
- The capsule is composed of a complex mixture of sugars and acetic acid.
- The capsular polysaccharide is a potential target for immune responses against Pasteurella piscicida.