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Published on: December 18, 2010
Unraveling host-pathogen dynamics in a murine Model of septic peritonitis induced by vancomycin-resistant
Xin Yuan1,2, Xiaolin Song2, Xi Zhang2
1School of Life Sciences, Ludong University, Yantai, China.
Abstract:
Vancomycin-resistant Enterococcus faecium (E. faecium) infection is associated with higher mortality rates. Previous studies have emphasized the importance of innate immune cells and signalling pathways in clearing E. faecium, but a comprehensive analysis of host-pathogen interactions is lacking. Here, we investigated the interplay of host and E. faecium in a murine model of septic peritonitis. Following injection with a sublethal dose, we observed significantly increased murine sepsis score and histological score, decreased weight and bacterial burden, neutrophils and macrophages infiltration, and comprehensive activation of cytokine-mediated signalling pathway. In mice receiving a lethal dose, hypothermia significantly improved survival, reduced bacterial burden, cytokines, and CD86 expression of MHC-II+ recruited macrophages compared to the normothermia group. A mathematical model constructed by observational data from 80 animals, recapitulated the host-pathogen interplay, and further verified the benefits of hypothermia. These findings indicate that E. faecium triggers a severe activation of cytokine-mediated signalling pathway, and hypothermia can improve outcomes by reducing bacterial burden and inflammation.
Insights
Vancomycin-resistant Enterococcus faecium causes severe sepsis. Hypothermia treatment reduced bacterial load and inflammation, improving survival in a murine model.
Area of Science:
- Infectious Diseases
- Immunology
- Computational Biology
Background:
- Vancomycin-resistant Enterococcus faecium (VRE) infections are linked to high mortality.
- Understanding host-pathogen interactions is crucial for VRE infection management.
- Previous research highlighted innate immunity's role, but a comprehensive analysis was missing.
Purpose of the Study:
- To investigate the host-pathogen interplay during Enterococcus faecium septic peritonitis in a murine model.
- To evaluate the therapeutic potential of hypothermia in VRE sepsis.
Main Methods:
- Induction of septic peritonitis in mice using Enterococcus faecium.
- Assessment of clinical and histological scores, weight, bacterial burden, and immune cell infiltration.
- Analysis of cytokine profiles and macrophage marker expression (CD86, MHC-II).
- Development of a mathematical model to simulate host-pathogen dynamics.
Main Results:
- Sublethal E. faecium infection led to increased sepsis and histological scores, decreased weight, and elevated immune cell infiltration.
- Lethal infection showed that hypothermia improved survival, reduced bacterial burden, lowered cytokine levels, and decreased CD86 expression on macrophages.
- The mathematical model corroborated the experimental findings and confirmed hypothermia's benefits.
Conclusions:
- Enterococcus faecium infection triggers a robust cytokine-mediated signaling pathway activation.
- Hypothermia is a promising therapeutic strategy for VRE sepsis, mitigating bacterial load and inflammation.
- The study provides insights into host-pathogen interactions and the efficacy of hypothermia in VRE infections.
