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Passive protection of mice against intraperitoneally injected Vibrio cholerae by G and M antibody
Abstract:
Fractions of rabbit anti-Vibrio cholerae serum containing gammaG antibodies were compared with fractions containing gammaM antibodies for their ability to protect mice against lethal infection resulting from the intraperitoneal injection of organisms suspended in mucin. About twice as much gammaG as gammaM (estimated by quantitative precipitation) was required to protect against approximately 1,000 50% lethal doses when the antibody was given intraperitoneally 4 hr before challenge. When protective serum fractions were given subcutaneously, however, the amount of gammaM required to protect was increased about 40-fold, whereas gammaG was about equally effective subcutaneously and intraperitoneally.
Insights
This study compared gammaG and gammaM antibodies for Vibrio cholerae infection protection in mice. GammaG antibodies were more effective than gammaM antibodies, especially when administered subcutaneously.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Vibrio cholerae causes cholera, a severe diarrheal disease.
- Antibodies play a crucial role in neutralizing bacterial pathogens.
- Different antibody isotypes, such as gammaG and gammaM, may have varying protective efficacies.
Purpose of the Study:
- To compare the protective capabilities of gammaG and gammaM antibodies against Vibrio cholerae infection in a mouse model.
- To evaluate the influence of administration route on antibody efficacy.
Main Methods:
- Rabbit anti-Vibrio cholerae serum was fractionated to isolate gammaG and gammaM antibodies.
- Mice were challenged with Vibrio cholerae suspended in mucin after intraperitoneal or subcutaneous administration of antibody fractions.
- Quantitative precipitation was used to estimate antibody concentrations.
Main Results:
- Approximately twice the amount of gammaG antibody compared to gammaM antibody was needed for protection when given intraperitoneally.
- Subcutaneous administration of gammaM antibodies required ~40 times more antibody for protection compared to intraperitoneal administration.
- GammaG antibodies maintained similar efficacy regardless of whether they were administered intraperitoneally or subcutaneously.
Conclusions:
- GammaG antibodies demonstrate superior protective efficacy against Vibrio cholerae infection compared to gammaM antibodies, particularly via the subcutaneous route.
- The route of antibody administration significantly impacts the protective effectiveness of gammaM antibodies.
- These findings have implications for the development of antibody-based therapies for cholera.