Related Experiment Video
Updated: Jul 10, 2026
Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Aged HCT-8 cell monolayers support Cryptosporidium parvum infection
Laura Y Sifuentes1, George D Di Giovanni
1Texas A&M University Agricultural Research and Extension Center, El Paso, TX 79927, USA.
Abstract:
Cell culture assays in various formats have been used to study the infectivity of Cryptosporidium spp. as well as to determine the infectivity of naturally occurring oocysts in water. Currently, cell culture assays for infectious Cryptosporidium spp. in water have largely been limited to practice in research laboratories. One obstacle to the routine use of Cryptosporidium cell culture assays for the analysis of water samples is the coordination of water sample collection and processing with readiness of cell culture monolayers. For most Cryptosporidium cell culture assays, monolayers are allowed to develop for 24 to 48 h to reach 80 to 100% confluence prior to inoculation. In this study, we used immunofluorescent assay microscopy to evaluate freshly confluent (2-day-old) and aged (8- to 67-day-old) HCT-8 cell monolayers for their ability to support Cryptosporidium parvum infection. HCT-8 monolayers as old as 67 days were clearly shown to support infection. In two of three experiments, aged monolayers (8- to 11-day-old and 11- to 22-day-old, respectively) developed the same number of C. parvum clusters of infection as freshly confluent monolayers. Results suggest that it may be possible to use cell monolayers from freshly confluent to 3 weeks old on hand for infectivity assays without having to schedule sample processing to coincide with development of freshly confluent monolayers. This would make Cryptosporidium cell culture assays much more feasible for water quality and utility laboratories.
Insights
Aged cell cultures, up to 67 days old, effectively support Cryptosporidium parvum infection. This finding simplifies Cryptosporidium infectivity assays for water quality testing.
Area of Science:
- Parasitology
- Cell Biology
- Environmental Microbiology
Background:
- Cell culture assays are vital for studying Cryptosporidium spp. infectivity.
- Current methods for waterborne Cryptosporidium analysis are limited to research settings.
- Coordinating sample processing with cell monolayer readiness is a major challenge.
Purpose of the Study:
- To evaluate the suitability of aged HCT-8 cell monolayers for Cryptosporidium parvum infection studies.
- To determine if older cell monolayers can support C. parvum infectivity, simplifying assay logistics.
Main Methods:
- HCT-8 cell monolayers of varying ages (freshly confluent to 67 days old) were inoculated with Cryptosporidium parvum.
- Immunofluorescent assay microscopy was used to quantify C. parvum infection clusters.
- Infection levels in aged monolayers were compared to those in freshly confluent monolayers.
Main Results:
- Aged HCT-8 monolayers, up to 67 days old, supported C. parvum infection.
- Infection cluster development in 8- to 22-day-old monolayers was comparable to freshly confluent monolayers.
- Older monolayers demonstrated viability for supporting parasite development.
Conclusions:
- Cell monolayers aged up to 3 weeks can be used for Cryptosporidium infectivity assays.
- This flexibility reduces the need for strict scheduling, making assays more feasible for routine water quality labs.
- The findings streamline Cryptosporidium testing in water analysis.
