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Experimental infection with Cryptosporidium parvum IIaA21G1R1 subtype in immunosuppressed mice
Valeria F Del Coco1, María A Córdoba, Alicia Sidoti
1Cátedra de Microbiología y Parasitología, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, La Plata 1900, Argentina.
Abstract:
Cryptosporidium parvum subtype IIaA21G1R1 oocysts were used to infect dexamethasone immunosuppressed N: NIH Swiss mice. This is the first Cryptosporidium mouse model in which the relationship between infection and apoptosis has been histologically studied at each portion of the gut in order to observe this dynamic in chronic cryptosporidiosis. Histology showed developmental stages in the duodenum, proximal and distal jejunum, ileum, cecum and colon, with the small intestine remaining infected until day 35 post infection. At proximal jejunum an inverse correlation between infection and apoptosis was observed at days 28 and 35 p.i. Data suggests that jejunum could be an interesting place to carry out further studies on the dynamics of Cryptosporidium infection and apoptosis. Based on these findings, this mouse model was useful to evaluate clinical, parasitological and histological aspects of C. parvum subtype IIaA21G1R1 infection, and it will be an appropriate tool to investigate different aspects of Cryptosporidium infection.
Insights
This study introduces a novel mouse model for Cryptosporidium parvum infection, revealing its presence throughout the gut. Researchers observed an inverse relationship between infection and apoptosis in the jejunum, suggesting it as a key area for further research.
Area of Science:
- Veterinary Parasitology
- Immunology
- Gastroenterology
Background:
- Cryptosporidium parvum is a significant enteric pathogen causing opportunistic infections in immunocompromised individuals.
- Understanding the host-parasite dynamics, including apoptosis, is crucial for developing effective treatments.
- Existing mouse models have limitations in fully recapitulating chronic cryptosporidiosis and its gut-specific pathological processes.
Purpose of the Study:
- To establish and characterize a novel mouse model for Cryptosporidium parvum subtype IIaA21G1R1 infection.
- To investigate the relationship between Cryptosporidium infection and apoptosis in different segments of the gastrointestinal tract.
- To evaluate the utility of this model for studying chronic cryptosporidiosis.
Main Methods:
- Infection of dexamethasone-immunosuppressed N:NIH Swiss mice with Cryptosporidium parvum subtype IIaA21G1R1 oocysts.
- Histological examination of gut tissues (duodenum, jejunum, ileum, cecum, colon) at various time points post-infection.
- Assessment of developmental stages, infection levels, and apoptotic activity.
Main Results:
- Cryptosporidium developmental stages were observed throughout the entire gastrointestinal tract, with sustained infection in the small intestine up to 35 days post-infection.
- An inverse correlation between infection and apoptosis was noted in the proximal jejunum at 28 and 35 days post-infection.
- The model successfully demonstrated clinical, parasitological, and histological aspects of C. parvum infection.
Conclusions:
- The developed mouse model is suitable for studying chronic Cryptosporidium parvum infection.
- The jejunum appears to be a critical site for investigating the interplay between Cryptosporidium infection and host apoptotic responses.
- This model provides a valuable tool for future research into Cryptosporidium pathogenesis and therapeutic strategies.
