Rabbit intestinal xenograft model for human Encephalitozoon infections in mice

Area of Science:

• Microbiology
• Immunology
• Parasitology

Background:

• Encephalitozoon cuniculi and other microsporidia are opportunistic pathogens.
• The gastrointestinal tract is a primary entry point for these pathogens.
• A dedicated animal model for studying intestinal uptake and spread is lacking.

Purpose of the Study:

• To develop and validate an experimental animal model for studying microsporidial infections.
• To investigate intestinal uptake and systemic dissemination of Encephalitozoon species.
• To provide a platform for evaluating anti-microsporidial agents and immune responses.

Main Methods:

• Fetal rabbit small intestine segments were xenografted into athymic nude or SCID mice.
• Xenografts were inoculated with Encephalitozoon cuniculi, E. intestinalis, or E. hellem.
• Infection was assessed via light microscopy and host organ analysis.

Main Results:

• Intestinal xenografts were successfully infected with E. cuniculi, E. intestinalis, and E. hellem.
• Extraintestinal spread of E. cuniculi was observed in the brain, respiratory tract, spleen, and GI tract.
• E. intestinalis infection disseminated to the liver in a subset of mice.

Conclusions:

• Intestinal xenografts offer a sterile, relevant model for studying microsporidial infections.
• The model supports research on host-enterocyte/parasite interactions and pathogenicity.
• Evidence of persistent infection and intestinal spread of Encephalitozoon spp. was demonstrated.