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Updated: Oct 24, 2025
Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Long-term in vitro Culture of Cryptosporidium parvum
Nigel Yarlett1,2, Mary Morada1
1Haskins Laboratories, Pace University, New York, NY, USA.
Abstract:
Continuous in vitro growth of Cryptosporidium parvum has proved difficult and conventional in vitro culture techniques result in short-term (2-5 days) growth of the parasite resulting in thin-walled oocysts that fail to propagate using in vitro cultures, and do not produce an active infection using immunosuppressed or immunodeficient mouse models (Arrowood, 2002). Here we describe the use of hollow fiber bioreactors (HFB) that simulate in vivo conditions by providing oxygen and nutrients to host intestinal cells from the basal surface and permit the establishment of a low redox, high nutrient environment on the apical surface. When inoculated with 105 C. parvum (Iowa isolate) oocysts the bioreactor produced 108 oocysts per ml (20 ml extra-capillary volume) after 14 days, and was maintained for over 2 years. In vivo infectivity studies using a TCR-α-immune deficient mouse model showed that oocysts produced from the bioreactor at 6, 12 and 18 months were indistinguishable from the parent Iowa isolate used to initiate the culture. HFB produced oocysts had similar percent excystation profiles to the parent Iowa isolate.
Insights
Continuous in vitro culture of Cryptosporidium parvum is challenging. Hollow fiber bioreactors (HFB) enable long-term parasite growth and produce infectious oocysts, overcoming previous limitations.
Area of Science:
- Parasitology
- Infectious Diseases
- Biotechnology
Background:
- Conventional in vitro culture of Cryptosporidium parvum yields short-term growth (2-5 days).
- Existing methods produce thin-walled oocysts that fail to propagate and lack infectivity in mouse models.
- Difficulty in continuous in vitro cultivation hinders Cryptosporidium parvum research.
Purpose of the Study:
- To develop a novel in vitro culture system for sustained Cryptosporidium parvum growth.
- To generate infectious Cryptosporidium parvum oocysts using a simulated in vivo environment.
- To assess the infectivity and characteristics of oocysts produced in the novel system.
Main Methods:
- Utilized hollow fiber bioreactors (HFB) to mimic in vivo conditions for host intestinal cells.
- Provided oxygen and nutrients to host cells basally, creating a low redox, high nutrient apical environment.
- Inoculated HFB with Cryptosporidium parvum oocysts and monitored growth over time.
Main Results:
- HFB cultures achieved high oocyst yields (10^8 oocysts/ml) within 14 days.
- Continuous culture was maintained for over 2 years.
- Oocysts produced at 6, 12, and 18 months demonstrated indistinguishable in vivo infectivity and excystation profiles compared to the parent isolate.
Conclusions:
- Hollow fiber bioreactors provide a viable method for continuous in vitro cultivation of Cryptosporidium parvum.
- HFB technology overcomes limitations of conventional culture, producing infectious oocysts.
- This system facilitates long-term study and propagation of Cryptosporidium parvum.
