[Proteus peritonitis-bacteremia in mice--a model for studying postvaccinal Proteus immunity]
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Abstract:
The dynamics of the formation of postvaccinal immunity after immunization with preparations obtained with the use of hydroxylamine (HA) preparations from Proteus strains of different O serogroups, Salmonella minnesota Re-mutant and the common antimicrobial antigen isolated from Escherichia coli 14 has been studied on mice with Proteus peritonitis-bacteremia used as a model. The study has revealed that intraperitoneal immunization with Proteus HA preparations stimulates the phagocytic activity of peritoneal mononuclear cells in mice and induces an increase in the titers of specific O antibodies. Proteus antigens ensure the formation of anti-Proteus immunity, preventing the death of the animals from peritonitis-bacteremia. The protection of mice from such infection resulting from the injection of the common antigens of gram-negative bacteria is considerably less. These data are indicative of the possibility of using Proteus peritonitis-bacteremia as a model for the study of the protective potency of Proteus vaccines.
Insights
Mice immunized with Proteus hydroxylamine (HA) preparations developed enhanced immunity against Proteus infections. This study suggests Proteus peritonitis-bacteremia is a viable model for evaluating Proteus vaccines.
Area of Science:
- Immunology
- Microbiology
- Vaccinology
Background:
- Postvaccinal immunity dynamics are crucial for vaccine development.
- Proteus infections pose significant health challenges.
- Hydroxylamine (HA) preparations are explored for their immunogenic potential.
Purpose of the Study:
- To investigate the formation of postvaccinal immunity following immunization with hydroxylamine (HA) preparations from Proteus strains.
- To evaluate the efficacy of Proteus antigens and common Gram-negative bacterial antigens in a Proteus peritonitis-bacteremia mouse model.
- To assess the stimulation of phagocytic activity and antibody titers.
Main Methods:
- Utilized a mouse model of Proteus peritonitis-bacteremia.
- Administered intraperitoneal immunization with Proteus HA preparations, Salmonella minnesota Re-mutant, and common Escherichia coli antigen.
- Monitored phagocytic activity of peritoneal mononuclear cells and specific O antibody titers.
Main Results:
- Intraperitoneal immunization with Proteus HA preparations stimulated phagocytic activity and increased specific O antibody titers in mice.
- Proteus antigens conferred significant protection against death from Proteus peritonitis-bacteremia.
- Protection induced by common Gram-negative bacterial antigens was considerably less effective.
Conclusions:
- Proteus HA preparations effectively induce anti-Proteus immunity.
- The Proteus peritonitis-bacteremia model is suitable for studying the protective efficacy of Proteus vaccines.
- Specific antigens are more effective in conferring targeted immunity than common antigens.
