Continuous culture of Cryptosporidium parvum using hollow fiber technology
Mary Morada1, Sangun Lee2, Leslie Gunther-Cummins3
1Haskins Laboratories, and Department of Chemistry and Physical Sciences, Pace University, New York, USA.
Abstract:
Diarrheal disease is a leading cause of pediatric death in economically low resource countries. Cryptosporidium spp. are the second largest member of this group and the only member for which no treatment exists. One of the handicaps to developing chemotherapy is the lack of a reproducible long-term culture method permitting in vitro drug screening beyond 48 h. We have adapted the well-established hollow fiber technology to provide an environment that mimics the gut by delivering nutrients and oxygen from the basal layer upwards while allowing separate redox and nutrient control of the lumen for parasite development. Using this technique, oocyst production was maintained for >6 months, producing approximately 1×10(8)oocysts ml(-1)day(-1), compared with 48 h with a yield of 1×10(6)oocysts ml(-1) in two-dimensional cultures. Oocysts, after 4 and 20 weeks in culture, produced a chronic infection in a TCR-α-deficient mouse model. In vivo infectivity of oocysts was confirmed using oocysts from a 6 week culture in a dexamethasone immunosuppressed mouse model.
Insights
A new hollow fiber technology enables long-term culture of Cryptosporidium, crucial for developing treatments against this pediatric diarrheal disease pathogen.
Area of Science:
- Parasitology
- Infectious Diseases
- Biotechnology
Background:
- Diarrheal diseases cause significant pediatric mortality globally.
- Cryptosporidium species are a major cause of diarrheal illness, with no available treatments.
- Developing effective chemotherapy is hindered by the lack of long-term in vitro culture methods for drug screening.
Purpose of the Study:
- To develop a reproducible long-term culture system for Cryptosporidium.
- To enable in vitro drug screening beyond 48 hours.
- To mimic the in vivo gut environment for parasite development.
Main Methods:
- Adaptation of hollow fiber technology to create a simulated gut environment.
- Controlled delivery of nutrients and oxygen from the basal layer.
- Separate redox and nutrient control of the lumen for parasite growth.
Main Results:
- Sustained oocyst production for over 6 months, yielding approximately 1×10(8) oocysts/ml/day.
- Significantly higher yield compared to 2D cultures (1×10(6) oocysts/ml in 48 hours).
- Oocysts cultured for up to 20 weeks maintained infectivity in immunocompromised mouse models.
Conclusions:
- The hollow fiber system provides a robust platform for long-term Cryptosporidium culture.
- This advancement facilitates in vitro drug screening for potential anti-cryptosporidial therapies.
- The developed method supports the study of parasite infectivity and drug efficacy over extended periods.
