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Spontaneous bacterial clearance in experimental urinary tract infections in mice: cellular aspects of the process
Abstract:
The morphological aspects of Proteus mirabilis clearance from the urinary tract of experimentally infected mice were investigated. For this purpose, two groups of mice were compared: a group infected with the bacterium and a group that had just recovered from the infection. Differences between the two groups were found in extent of bladder and kidney inflammation, depth of infiltration into the bladder wall, and in the increment of bladder volume. There was no clear-cut difference between the two groups in number of lymphocytes and monocytes, but the number of granulocytes was significantly lower in the bladder and kidneys of the recently healed animals. Likewise, the plasma cells were fewer in healed animals than in infected ones, the difference being statistically significant for bladders and on the verge of significance for kidneys.
Insights
Proteus mirabilis infection in mice shows reduced granulocytes and plasma cells in healed urinary tracts. This suggests immune system changes contribute to bacterial clearance and recovery from urinary tract infections.
Area of Science:
- Urology
- Immunology
- Microbiology
Background:
- Proteus mirabilis is a common cause of urinary tract infections (UTIs).
- Understanding the host's immune response during and after infection is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the morphological changes in the urinary tract of mice during Proteus mirabilis clearance.
- To compare the immune cell profiles in infected versus recently recovered mice.
Main Methods:
- Experimental infection of mice with Proteus mirabilis.
- Comparison of bladder and kidney tissues from infected and recovered groups.
- Histological analysis to assess inflammation, cell infiltration, and bladder volume.
Main Results:
- Recovered mice exhibited less bladder and kidney inflammation and reduced bladder volume.
- Significantly lower numbers of granulocytes were observed in the bladder and kidneys of healed animals.
- Plasma cell counts were significantly lower in the bladders of recovered mice compared to infected ones.
Conclusions:
- The resolution of Proteus mirabilis infection involves a reduction in specific immune cell populations.
- Lower granulocyte and plasma cell levels in healed animals suggest a shift in the inflammatory response post-infection.
- These findings contribute to understanding the host-pathogen dynamics in bacterial UTIs.