A Technique to Develop a Parasite Infection in Intestinal Organoids via Microinjection
JoVE Encyclopedia of Experiments
Immunology
0 views • 2:33 min • July 8th, 2025
Take a human intestinal organoid culture. The organoids consist of epithelial cells facing the central lumen, mimicking in vivo architecture.
Take a microinjector containing crescent-shaped sporozoites — the infective form — of Cryptosporidium parvum, a parasite.
Inject sporozoites into the organoid lumen.
Parasite lectins bind to specific carbohydrates on epithelial cells, facilitating their entry into a parasitophorous vacuole.
Internalized parasite transforms into a trophozoite — the feeding stage — which acquires nutrients and undergoes asexual reproduction to form type I meront, containing merozoites — the invasive form.
Released merozoites infect neighboring epithelial cells and develop type II meronts containing merozoites.
The merozoites enter neighboring cells and differentiate into either microgamont or macrogamont — male and female reproductive stages.
The microgamont undergoes division to form microgametes, which are released outside the vacuole.
A microgamete fertilizes the macrogamont, producing a zygote.
The zygote undergoes division, forming a sporozoite-containing oocyst. Upon release, the sporozoites repeat the infection cycle.
Harvest the organoids to assess the infection progress.
To microinject the parasites into the apical side of a 3D organoid, first, use a micropipette puller to prepare glass injection capillaries. Use forceps to cut the tip of the capillary to a 9- to 12-micrometer diameter, to enable an easy flow of sporozoites, or oocysts if you choose to inject oocysts directly, and use micro-loader tips to fill each capillary with a fast green dye-labeled oocyst or sporozoite suspension.
Then, load the first sporozoite-filled capillary into a microinjector, and use an inverted microscope at a 5x magnification and a constant pressure to microinject 100 to 200 nanoliters of the suspension into each organoid.
Overview
This study demonstrates the infection process of Cryptosporidium parvum using human intestinal organoid cultures. The organoids mimic in vivo architecture, allowing for detailed observation of the parasite's lifecycle.
Key Study Components
Area of Science
- Microbiology
- Parasitology
- Cell Biology
Background
- Cryptosporidium parvum is a significant intestinal parasite affecting humans.
- Understanding its lifecycle is crucial for developing therapeutic strategies.
- Organoid cultures provide a relevant model for studying host-parasite interactions.
- Microinjection techniques allow for precise introduction of parasites into organoids.
Purpose of Study
- To investigate the infection dynamics of Cryptosporidium parvum in human intestinal organoids.
- To analyze the transformation of sporozoites into trophozoites and subsequent stages.
- To assess the impact of the parasite on epithelial cells.
Methods Used
- Preparation of human intestinal organoid cultures.
- Microinjection of crescent-shaped sporozoites into the organoid lumen.
- Observation of parasite lifecycle stages within the organoids.
- Harvesting organoids to evaluate infection progress.
Main Results
- Sporozoites successfully entered epithelial cells and transformed into trophozoites.
- Parasite replication was observed, leading to the formation of merozoites.
- Merozoites infected neighboring cells, continuing the infection cycle.
- The study provided insights into the reproductive stages of the parasite.
Conclusions
- The human intestinal organoid model is effective for studying Cryptosporidium parvum infection.
- Understanding the lifecycle stages can inform future therapeutic approaches.
- This model can be utilized for further research on intestinal parasites.
Frequently Asked Questions
Executive Industry Relevance
This technique enables the development of a physiologically relevant human intestinal organoid model for studying Cryptosporidium parvum infection, supporting target validation in antiparasitic drug discovery. By recapitulating the full parasite lifecycle in a controlled 3D system, it provides a disease-relevant platform for mechanistic de-risking and lead identification efforts. The model enhances predictive confidence in preclinical evaluation by allowing direct observation of host-parasite interactions and replication dynamics.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of therapeutic hypotheses by observing parasite invasion, replication, and differentiation in human epithelial cells.
- Scientific Value: Supports functional target validation through visualization of lectin-mediated entry and parasitophorous vacuole formation.
- Scientific Value: Facilitates pathway clarification by tracking asexual and sexual reproduction stages within the organoid lumen.
Screening & Assay Development
- Scientific Value: Generates quantifiable infection readouts such as meront formation and oocyst production for compound screening.
- Operational Value: Standardizes parasite delivery via microinjection, ensuring reproducible initiation of infection across organoid batches.
- Operational Value: Enables scalable assessment of infection progression through harvest and analysis of infected organoids.
Translational & Preclinical Research
- Scientific Value: Provides a disease-relevant system that maintains the natural lifecycle of Cryptosporidium parvum, supporting translational biomarker alignment.
- Scientific Value: Allows assessment of compound effects on multiple lifecycle stages, from sporozoite entry to oocyst release.
- Operational Value: Supports risk-adjusted advancement decisions by enabling preclinical evaluation of antiparasitic candidates in a human tissue context.
Pipeline & Workflow Integration
The method fits within the early discovery continuum, supporting target validation through mechanistic observation and enabling assay development for downstream screening campaigns.
- Discovery Biology: Supports hypothesis testing by allowing direct visualization of parasite lifecycle progression in human intestinal epithelium.
- Screening: Delivers standardized, quantitative infection models suitable for high-content or high-throughput compound evaluation.
- Analytics: Generates measurable outputs including trophozoite transformation, meront formation, and oocyst yield for comparative analysis.
- Translational Research: Maintains continuity from discovery to preclinical by preserving the full parasitic lifecycle in a human-derived system.
- Enterprise Reuse: Establishes a reusable platform for studying intestinal parasites, reducing reliance on animal models and increasing translational fidelity.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence by reducing mechanistic ambiguity in host-parasite interactions.
- Operational Value: Enhances reproducibility through standardized microinjection volumes and capillary preparation.
- Strategic Value: Improves go/no-go decisions by enabling early-stage efficacy assessment in a human tissue model.
- Portfolio Impact: Supports risk-adjusted prioritization of antiparasitic candidates based on observed effects on parasite development.
Implementation Considerations
- Requires expertise in human intestinal organoid culture and microinjection techniques.
- Dependent on access to a microinjector, inverted microscope, and micropipette puller for capillary preparation.
- Necessitates standardization of sporozoite concentration and injection volume (100–200 nL) across experimental sets.
- Involves adaptation considerations when extending the model to other intestinal parasites or mutant strains.
- Limited by the availability of infectious sporozoites and the technical challenge of maintaining parasite viability during injection.
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Last updated: 29 August 2026