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Early expression in mice of genetic resistance to intestinal amebiasis
F Anaya-Velázquez1, B J Underdown
1Intituto de Inv. en Biología Experimental, Facultad de Química, Universidad de Guanajuato, México.
Abstract:
Some strains of mice are known to be relatively resistant to hepatic or intestinal amebic infections. In order to know if the intestinal resistance is expressed few hours after infection, we inoculated axenic amebae in three inbred strains of mice either by direct intracecal injection or by infection of a washed-closed cecal loop. We found that amebae do not survive in conventional animals but they colonize longer in animals with the cecal loop. However, the survival was low after 24 hours postinfection. Balb/c mice were more susceptible and CBA mice more resistant. Our results suggest that genetic resistance to intestinal amebiasis is expressed in mice in the early phases of infection.
Insights
Genetic resistance to intestinal amebiasis in mice is evident within hours of infection. CBA mice show more resistance than Balb/c mice, indicating early-phase genetic control of amebic infections.
Area of Science:
- Immunology
- Infectious Diseases
- Parasitology
Background:
- Some mouse strains exhibit resistance to amebic infections.
- Understanding early resistance mechanisms is crucial for amebiasis research.
Purpose of the Study:
- To investigate if intestinal resistance to amebiasis is expressed early after infection in mice.
- To compare susceptibility among different inbred mouse strains.
Main Methods:
- Inoculation of axenic amebae into three inbred mouse strains via intracecal injection or cecal loop.
- Monitoring amebae survival and colonization at early time points postinfection.
Main Results:
- Amebae survived longer in cecal loops compared to conventional animals.
- Low amebae survival was observed after 24 hours postinfection.
- Balb/c mice were more susceptible; CBA mice were more resistant.
Conclusions:
- Genetic resistance to intestinal amebiasis is expressed in mice during the early hours of infection.
- Inbred mouse strain differences influence susceptibility to amebic infections.