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Development of a germfree mouse model of Vibrio cholerae infection
J R Butterton1, E T Ryan, R A Shahin
1Infectious Disease Unit, Massachusetts General Hospital, Boston 02114, USA.
Abstract:
A mouse model of Vibrio cholerae infection was successfully developed with germfree mice. Three- to four-week-old germfree mice were orally inoculated with strains of V. cholerae to be tested and then moved to normal housing after inoculation. Stool culture, measurement of serum vibriocidal antibody titers, and determination of immune responses to the cholera toxin B subunit demonstrated that germfree mice are readily colonized by V cholerae and develop systemic and mucosal immune responses to antigens expressed by these organisms. Immune responses to the B subunit of Shiga toxin 1, which was expressed from a V. cholerae vaccine vector, were less pronounced. This model should be valuable for studying immune responses to V. cholerae infection and immunization, including responses to heterologous antigens expressed by cholera vector strains.
Insights
Researchers developed a germfree mouse model for studying Vibrio cholerae infections. This model effectively shows colonization and immune responses, aiding vaccine development for cholera.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Vibrio cholerae causes cholera, a significant global health concern.
- Developing effective vaccines and understanding immune responses are crucial for disease control.
Purpose of the Study:
- To establish a reliable germfree mouse model for Vibrio cholerae infection.
- To evaluate immune responses to V. cholerae colonization and vaccine vectors.
Main Methods:
- Germfree mice were orally inoculated with V. cholerae strains.
- Colonization was assessed via stool cultures.
- Serum vibriocidal antibody titers and immune responses to cholera toxin B subunit were measured.
Main Results:
- Germfree mice were successfully colonized by V. cholerae.
- A robust systemic and mucosal immune response to V. cholerae antigens was observed.
- Immune responses to heterologous antigens expressed by a V. cholerae vaccine vector were less pronounced.
Conclusions:
- The developed germfree mouse model is suitable for studying V. cholerae infection and immune responses.
- This model can be utilized to assess the efficacy of cholera vaccines and vector-based immunization strategies.