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A morphological study in germfree mice (Salmonella infection)
Abstract:
The morphological manifestation of the intestinal infections of Salmonella typhimurium by the intestine rolled method in both conventional DKI and germfree mice have been investigated in our laboratory. In the conventional mice, the morphological manifestation of intestinal infection shows no difference from the general features of infection, while in the germfree mice, the manifestation is characterized by the so-called non-reactive necrotizing enteritis without cellular reaction. When infection in the germfree mice occurs, some state of immunological insufficiency should be taken into consideration. In infections of germfree mice it is difficult to consider the immunological or the allergic reaction which is expected in the conventional mice. In addition, the direct influences of bacteria such as endotoxin must be taken into consideration as another possibility, but the very limited localized lesions, as seen in this experiment cannot always be suggested to be due to the direct influence of bacteria or intoxication. Though there are many problems to be solved in the future, we are now able to state a kind of mechanism similar to that of Shwartzman's phenomenon cannot be ignored in the infection in newborns or in immunologically immature animals.
Insights
Salmonella typhimurium infection in germfree mice causes non-reactive necrotizing enteritis, suggesting immunological insufficiency. This contrasts with conventional mice and may involve mechanisms similar to the Shwartzman phenomenon in immature animals.
Area of Science:
- Microbiology
- Immunology
- Pathology
Background:
- Intestinal infections by Salmonella typhimurium are common.
- Understanding host-pathogen interactions is crucial for developing effective treatments.
- Germfree and conventional animal models offer distinct insights into infection dynamics.
Purpose of the Study:
- To investigate the morphological manifestations of Salmonella typhimurium intestinal infections.
- To compare infection outcomes in germfree versus conventional mice.
- To explore potential mechanisms underlying observed pathological differences.
Main Methods:
- Utilized the intestine rolled method for morphological examination.
- Inoculated both germfree and conventional mice with Salmonella typhimurium.
- Observed and documented pathological changes in the intestinal tissues.
Main Results:
- Conventional mice exhibited general infection features.
- Germfree mice developed non-reactive necrotizing enteritis without cellular reaction.
- Lesions in germfree mice were localized, questioning direct bacterial or endotoxin influence.
Conclusions:
- Germfree mice display immunological insufficiency during Salmonella typhimurium infection.
- The observed pathology in germfree mice differs significantly from conventional models.
- A mechanism resembling the Shwartzman phenomenon may be involved in infections of immature hosts.