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Complete development of Cryptosporidium parvum in bovine fallopian tube epithelial cells
S Yang1, M C Healey, C Du
1Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan 84322-5600, USA.
Abstract:
Cryptosporidium parvum is a coccidian parasite responsible for causing protracted and life-threatening diarrheal illness in immunocompromised humans, especially patients with AIDS. The lack of medications effective in treating people suffering from cryptosporidiosis has prompted the development of in vivo and in vitro models for this disease. This study is the first to demonstrate that C. parvum can complete its entire life cycle (from sporozoite to infective oocyst) in a primary culture of bovine fallopian tube epithelial (BFTE) cells. Scanning and transmission electron photomicrographs were used to detail the ultrastructure of individual parasitic stages. Successful infections were produced by inoculating cell cultures with either oocysts or purified sporozoites. Infection of BFTE cells with C. parvum close paralleled in vivo infections with regard to host cell location and chronology of parasite development. Infecting BFTE cells with sporulated oocysts provided a reproducible and quantitative cultivation system with significantly (P < or = 0.001) higher infection rates than in Madin-Darby canine kidney cells. Oocysts produced in BFTE cells were infective for immunosuppressed adult C57BL/6N mice. Cultivation of C. parvum in BFTE cells will facilitate the study of interactions between parasites and host cells as well as provide a reliable system for evaluating anticryptosporidial compound efficacy.
Insights
Researchers developed a new cell culture model for Cryptosporidium parvum, a parasite causing severe diarrhea. This bovine fallopian tube epithelial cell system successfully replicates the parasite's full life cycle, aiding drug discovery.
Area of Science:
- Parasitology
- Cell Biology
- Infectious Diseases
Background:
- Cryptosporidium parvum causes severe diarrhea, particularly in immunocompromised individuals.
- Effective treatments for cryptosporidiosis are limited, necessitating better research models.
- Existing in vitro models have limitations in replicating the parasite's complete life cycle.
Purpose of the Study:
- To establish a novel in vitro model for the complete life cycle of Cryptosporidium parvum.
- To investigate the ultrastructure of Cryptosporidium parvum stages within host cells.
- To evaluate the efficacy of a new cell culture system for parasite cultivation and drug screening.
Main Methods:
- Primary culture of bovine fallopian tube epithelial (BFTE) cells.
- Inoculation of BFTE cells with Cryptosporidium parvum oocysts or sporozoites.
- Scanning and transmission electron microscopy for ultrastructural analysis.
- Infection of immunosuppressed mice with oocysts produced in vitro.
Main Results:
- Demonstrated the complete life cycle of C. parvum in BFTE cells, from sporozoite to infective oocyst.
- Observed host cell location and developmental chronology mirroring in vivo infections.
- Achieved significantly higher infection rates in BFTE cells compared to Madin-Darby canine kidney cells (P < 0.001).
- Oocysts produced in BFTE cells were infective for immunosuppressed mice.
Conclusions:
- BFTE cells provide a reproducible and quantitative system for cultivating C. parvum.
- This model facilitates studies on host-parasite interactions.
- The system is valuable for evaluating the efficacy of anticryptosporidial compounds.