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Cryopreservation of infectious Cryptosporidium parvum oocysts achieved through vitrification using high aspect ratio
Justyna J Jaskiewicz1, Derin Sevenler2, Anisa A Swei2
1Department of Infectious Disease and Global Health, Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA, USA.
Abstract:
Infection with protozoa of the genus Cryptosporidium is a leading cause of child morbidity and mortality associated with diarrhea in the developing world. Research on this parasite has been impeded by many technical limitations, including the lack of cryopreservation methods. While cryopreservation of Cryptosporidium oocysts by vitrification was recently achieved, the method is restricted to small sample volumes, thereby limiting widespread implementation of this procedure. Here, a second-generation method is described for cryopreservation of C. parvum oocysts by vitrification using custom high aspect ratio specimen containers, which enable a 100-fold increase in sample volume compared to previous methods. Oocysts cryopreserved using the described protocol exhibit high viability, maintain in vitro infectivity, and are infectious to interferon-gamma (IFN-γ) knockout mice. Importantly, the course of the infection is comparable to that observed in mice infected with unfrozen oocysts. Vitrification of C. parvum oocysts in larger volumes will expedite progress of research by enabling the sharing of isolates among different laboratories and the standardization of clinical trials.
Insights
A new method allows larger-volume cryopreservation of Cryptosporidium parvum oocysts. This breakthrough in parasite research ensures oocyst viability and infectivity for future studies and clinical trials.
Area of Science:
- Medical Parasitology
- Infectious Diseases
- Microbiology
Background:
- Cryptosporidium infection is a major cause of childhood diarrhea and mortality globally.
- Technical limitations, particularly cryopreservation, hinder Cryptosporidium research.
- Previous vitrification methods for oocysts were limited to small sample volumes.
Purpose of the Study:
- To develop an improved cryopreservation method for Cryptosporidium parvum oocysts.
- To enable larger-volume sample preservation for wider research application.
- To overcome limitations of previous small-volume vitrification techniques.
Main Methods:
- Developed a second-generation vitrification protocol for C. parvum oocysts.
- Utilized custom high aspect ratio specimen containers for increased sample volume.
- Assessed oocyst viability, in vitro infectivity, and infectivity in interferon-gamma (IFN-γ) knockout mice.
Main Results:
- Achieved a 100-fold increase in sample volume compared to prior methods.
- Cryopreserved oocysts demonstrated high viability and maintained in vitro infectivity.
- Infection in IFN-γ knockout mice showed a course comparable to unfrozen oocysts.
Conclusions:
- The enhanced vitrification method allows for large-volume cryopreservation of C. parvum oocysts.
- This advancement will facilitate isolate sharing and standardization of research.
- Improved cryopreservation is expected to accelerate progress in Cryptosporidium research and clinical trials.
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