Protocol for inducing monomicrobial sepsis in mice with uropathogenic E. coli.

Area of Science:

• Microbiology
• Immunology
• Animal Models

Background:

• Sepsis is a life-threatening condition primarily caused by bacterial infections.
• Uropathogenic Escherichia coli (UPEC) is a common cause of sepsis.
• A well-defined animal model is crucial for studying the host immune response to UPEC sepsis.

Purpose of the Study:

• To present a detailed protocol for inducing monomicrobial sepsis in mice using UPEC.
• To establish a reproducible model for investigating host-pathogen interactions in sepsis.
• To provide a framework for analyzing immune responses in a UPEC sepsis model.

Main Methods:

• Preparation and standardization of UPEC bacterial cultures.
• Intraperitoneal or intravenous inoculation of mice to induce sepsis.
• Monitoring of clinical signs and survival post-infection.
• Collection of biological samples (blood, tissues) for analysis.
• Quantification of cytokine levels via ELISA or multiplex assays.
• Flow cytometry analysis of immune cell populations in spleen and blood.

Main Results:

• Successful induction of monomicrobial sepsis in a murine model using UPEC.
• Demonstration of measurable host immune responses, including cytokine release.
• Characterization of specific immune cell subset dynamics during infection.
• Establishment of a protocol amenable to further mechanistic studies.

Conclusions:

• The presented protocol provides a robust method for creating a UPEC-induced sepsis model in mice.
• This model facilitates the comprehensive study of host immune responses to bacterial sepsis.
• The protocol enables detailed analysis of cytokine profiles and immune cell populations, aiding in the understanding of sepsis pathogenesis.