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[Passive protective activities of human sera against infection with strain ST67P of Staphylococcus hyicus]
1Department of Microbiology, St. Marianna University School of Medicine.
Abstract:
Five tenths ml of passive protective antibodies in 100 samples of normal human sera against challenge with an encapsulated strain ST67P of Staphylococcus hyicus in mice were examined. Thirty three of them passively protected in mice against infection with strain ST67P of S. hyicus. The activities were sensitive to 2-mercaptoethanol and were absorbed out either with rabbit anti-human IgG, IgM or IgA serum. Also, the serum activities were absorbed out with cell surface polysaccharide extracted from the cell surface substance of the strain. When passive protective human serum was absorbed out with cell surface polysaccharide, reduction of IgG, IgA and IgM contents were 14.48, 19.49 and 33.3 percent, respectively, while 2.17, 4, 55 and zero in non protective human serum. These results indicate that the protective activities against strain ST67P were specifically related to IgM globulin against the above cell surface polysaccharide.
Insights
Normal human sera contain protective antibodies against Staphylococcus hyicus. These antibodies, primarily Immunoglobulin M (IgM), target the bacteria
Area of Science:
- Immunology
- Microbiology
- Veterinary Medicine
Context:
- Staphylococcus hyicus causes infections, particularly in animals.
- Understanding protective immune responses is crucial for developing treatments.
- Human sera can contain antibodies with potential protective functions.
Purpose:
- To investigate the nature and specificity of passive protective antibodies in normal human sera against Staphylococcus hyicus strain ST67P.
- To identify the immunoglobulin classes and target antigens involved in this protection.
Summary:
- One hundred human serum samples were tested for passive protection against Staphylococcus hyicus ST67P in mice.
- Thirty-three samples demonstrated protective activity, which was sensitive to 2-mercaptoethanol.
- Protective activity was absorbed by anti-human IgG, IgM, IgA sera and by cell surface polysaccharide from S. hyicus. IgM showed the greatest reduction (33.3%) after absorption with the polysaccharide, indicating a specific role in protection against this bacterial strain.
Impact:
- Identifies IgM as the primary immunoglobulin class responsible for passive protection against S. hyicus ST67P.
- Highlights the cell surface polysaccharide as a key target antigen for protective antibodies.
- Provides insights for potential development of immunotherapies or vaccines targeting Staphylococcus hyicus infections.