Specialized Proresolving Mediators Rescue Infant Mice from Lethal Citrobacter rodentium Infection and Promote...

Area of Science:

• Microbiology
• Immunology
• Pediatrics

Background:

• Infants are highly susceptible to oral pathogens, with enteric infections causing significant global morbidity and mortality.
• Enteropathogenic Escherichia coli (EPEC) poses the highest risk of infection-induced death in infants.
• A murine infant model using Citrobacter rodentium mimics EPEC infection in human infants, demonstrating increased susceptibility and mortality.

Purpose of the Study:

• To investigate the therapeutic potential of specialized proresolving mediators (SPM) in treating infant intestinal infections.
• To evaluate the effects of resolvin D1 (RvD1) and resolvin D5 (RvD5) on Citrobacter rodentium infection in infant mice.

Main Methods:

• Development of a murine infant model susceptible to Citrobacter rodentium infection.
• Administration of RvD1 and RvD5 post-infection in infant mice.
• Assessment of bacterial loads, intestinal inflammation, mortality, and immune responses (IgG).

Main Results:

• Infant mice infected with C. rodentium exhibited high mortality, severe intestinal inflammation, and bacterial dissemination.
• Post-infection treatment with RvD1 and RvD5 significantly reduced bacterial loads and inflammation.
• SPM treatment rescued infant mice from death and conferred protection from reinfection, inducing adult-like IgG responses.

Conclusions:

• Specialized proresolving mediators (SPM), including RvD1 and RvD5, show therapeutic promise for infant intestinal infections.
• SPM may offer novel treatment strategies for pathological infections in vulnerable infant populations.
• This study highlights the potential of SPM in mitigating infant mortality and morbidity associated with enteric infections.