Development of a Larval Zebrafish Infection Model for Clostridioides difficile

Area of Science:

• Immunology
• Microbiology
• Zebrafish models

Background:

• Clostridioides difficile infection (CDI) is a significant healthcare-associated gastrointestinal infection.
• The roles of neutrophils and macrophages in CDI pathogenesis are not fully understood.

Purpose of the Study:

• To establish a zebrafish (Danio rerio) larvae model for in vivo imaging of innate immune cell behavior during C. difficile infection.
• To develop and validate a noninvasive microgavage protocol for C. difficile administration in zebrafish.

Main Methods:

• Development of a fluorescent labeling protocol for C. difficile.
• Establishment of an invasive microinjection infection model.
• Development and implementation of a noninvasive microgavage infection protocol in zebrafish larvae.
• In vivo imaging of immune cell responses to C. difficile.

Main Results:

• The microgavage protocol successfully established C. difficile infection in zebrafish larvae, mimicking natural infection routes.
• The model allows for visualization of immune cell dynamics during infection.
• The noninvasive nature of microgavage minimizes experimental artifacts compared to microinjection.

Conclusions:

• The zebrafish larvae model with microgavage provides a valuable tool for studying innate immune responses in C. difficile infection.
• This model facilitates in vivo investigation of neutrophil and macrophage behavior during CDI.
• The noninvasive protocol enhances the reliability of studying host-pathogen interactions in CDI.