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Bacterial interference in mixed infection in the rat bladder.
K Watanabe1, Y Sakai, T Takezaki
1Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan.
Urologia Internationalis
|January 1, 1988
Summary
Escherichia coli (E. coli) inhibits Pseudomonas aeruginosa growth in mixed bladder infections. E. coli can colonize bladders with P. aeruginosa, but P. aeruginosa struggles to grow when E. coli is present.
Area of Science:
- Microbiology
- Urology
- Infectious Diseases
Background:
- Chronic bladder infections can involve polymicrobial colonization.
- Understanding bacterial interactions is crucial for treating complex urinary tract infections.
Purpose of the Study:
- To investigate the interaction between Escherichia coli and Pseudomonas aeruginosa in a chronic rat bladder infection model.
- To determine if E. coli inhibits P. aeruginosa growth during coinfection.
Main Methods:
- A chronic bladder infection model was established in male Wistar rats using implanted silk threads with bacterial strains.
- Bacterial counts in bladder urine were measured one week post-inoculation.
- Interactions were assessed through simultaneous inoculation and sequential inoculation experiments.
Main Results:
- P. aeruginosa exhibited reduced growth when coinoculated with E. coli compared to monoculture.
- E. coli colonization was successful when introduced into bladders already infected with P. aeruginosa.
- P. aeruginosa failed to establish significant growth when introduced into E. coli-colonized bladders.
- Bacteriocin activity did not correlate with the observed growth inhibition.
Conclusions:
- Escherichia coli actively interferes with the growth of Pseudomonas aeruginosa during mixed bladder infections.
- E. coli demonstrates a competitive advantage over P. aeruginosa in the bladder environment.
- These findings suggest a mechanism for E. coli dominance in polymicrobial urinary tract infections.