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Cryptosporidium parvum development in the BS-C-1 cell line
1Department of Population Health and Reproduction, School of Veterinary Medicine, University of California at Davis, 95616-8743, USA.
Abstract:
Cryptosporidium parvum is a worldwide parasitic protozoon capable of causing life-threatening disease in immunocompromised patients. In vitro cultivation of C. parvum has been under investigation for development of a well-defined in vitro model for C. parvum infectivity assay. This is the first report of C. parvum completing its life cycle in BS-C-1, an African green monkey kidney cell line. Both sodium hypochlorite-stimulated oocysts and purified sporozoites were able to initiate infection that led to completion of the whole life cycle, although inoculating purified sporozoites was less efficient. Beside Giemsa staining and normal light microscopy, an indirect fluorescent antibody staining method was developed to facilitate the detection and interpretation of C. parvum life stages developed in vitro. A C. parvum-specific polymerase chain reaction was also applied to detect and confirm the presence of C. parvum life stages in liquid from oocyst-infected cell cultures. In addition to the 452-base-pair (bp) product that can be specifically amplified from C. parvum oocysts and sporozoites, a fragment near 280 bp was also obtained. Various applications of this in vitro culture system are envisioned.
Insights
Cryptosporidium parvum successfully completed its life cycle in vitro using BS-C-1 cells, marking a significant advancement for developing infectivity assays. This breakthrough enables better study of the parasite
Area of Science:
- Parasitology
- Cell Biology
- Infectious Diseases
Background:
- Cryptosporidium parvum is a global protozoan parasite causing severe illness in immunocompromised individuals.
- Developing a reliable in vitro model for C. parvum infectivity assays is crucial for research.
Purpose of the Study:
- To report the successful in vitro cultivation of Cryptosporidium parvum, completing its life cycle.
- To establish a novel in vitro model for C. parvum infectivity studies.
Main Methods:
- Utilized BS-C-1 African green monkey kidney cells for in vitro cultivation.
- Initiated infection using sodium hypochlorite-stimulated oocysts and purified sporozoites.
- Employed Giemsa staining, light microscopy, indirect fluorescent antibody staining, and PCR for detection and confirmation.
Main Results:
- Demonstrated the complete life cycle of C. parvum in BS-C-1 cells for the first time.
- Confirmed infection initiation and life cycle completion from both stimulated oocysts and sporozoites.
- Developed and validated new staining and PCR methods for identifying C. parvum life stages in vitro.
Conclusions:
- The BS-C-1 cell line supports the complete in vitro life cycle of Cryptosporidium parvum.
- This novel in vitro system offers a valuable tool for C. parvum research and drug development.
- Further applications of this culture system are anticipated for advancing our understanding of cryptosporidiosis.