The cell-bound hemolysin of Serratia marcescens contributes to uropathogenicity

Area of Science:

• Microbiology
• Infectious Diseases
• Urology

Background:

• Serratia marcescens is an opportunistic pathogen implicated in various infections, including urinary tract infections (UTIs).
• Hemolysins are virulence factors produced by bacteria that can lyse red blood cells and damage host tissues.
• The specific role of cell-bound hemolysin from S. marcescens in UTI pathogenesis remains to be fully elucidated.

Purpose of the Study:

• To investigate the contribution of the cell-bound hemolysin of Serratia marcescens to the development of experimental urinary tract infections in a rat model.
• To compare the uropathogenic potential of a hemolysin-producing strain with an isogenic hemolysin-deficient strain.

Main Methods:

• An experimental UTI model was established in rats using Serratia marcescens.
• Two strains were used: a wild-type strain producing cell-bound hemolysin and an isogenic mutant strain lacking hemolysin production.
• Bacterial colonization levels in the urinary tract and the host's inflammatory response were assessed.

Main Results:

• The Serratia marcescens strain possessing cell-bound hemolysin demonstrated enhanced colonization of the urinary tract compared to the hemolysin-negative strain.
• A significantly stronger inflammatory response was observed in rats infected with the hemolysin-producing strain.
• These findings indicate that cell-bound hemolysin is a key factor in S. marcescens-mediated UTI.

Conclusions:

• Cell-bound hemolysin of Serratia marcescens plays a crucial role in bacterial uropathogenicity.
• This virulence factor promotes both bacterial survival and host tissue damage, leading to a more severe inflammatory response in UTIs.
• Targeting hemolysin activity could be a potential therapeutic strategy for Serratia marcescens-associated UTIs.