Two- and Three-Dimensional Human Intestinal Tissue Models for Cryptosporidium Infection

Area of Science:

• * Parasitology
• * Cell Biology
• * Biomedical Engineering

Background:

• * Conventional cell cultures inadequately model Cryptosporidium infection in vivo.
• * Transformed cell lines and primary cells lack the complexity of native human intestinal epithelium.
• * Previous 3D silk scaffold models supported parasite infection but used non-representative cells.

Purpose of the Study:

• * To develop and evaluate advanced in vitro models for studying Cryptosporidium parvum infection.
• * To create models that better recapitulate human intestinal physiology and architecture.
• * To facilitate long-term parasite culture and life cycle completion for mechanistic studies and drug screening.

Main Methods:

• * Development of 3D silk scaffold models using transformed intestinal epithelial cells (IECs) co-cultured with myofibroblasts.
• * Utilization of human intestinal organoids (hIOs)/enteroids (hIEs) in both 2D and 3D culture formats.
• * Culture of hIEs in 3D matrices and as monolayers on various supports, including silk scaffolds.
• * Co-culture of hIEs with other human cell types like macrophages and immune cells.

Main Results:

• * The 3D silk scaffold model supported C. parvum infection for up to two weeks, allowing parasite life cycle completion.
• * Human intestinal organoids (hIOs/hIEs) better represent native intestinal structure and function compared to traditional cell lines.
• * hIE-derived models, in both 2D and 3D formats, recapitulate intestinal physiology and offer a promising platform for studying host-pathogen interactions.
• * These advanced models enable co-culture with diverse human cell types, enhancing their physiological relevance.

Conclusions:

• * Human intestinal organoids (hIOs/hIEs) represent a significant advancement over conventional cell cultures for Cryptosporidium research.
• * 2D and 3D hIE-derived models provide powerful tools for studying Cryptosporidium-host cell interactions ex vivo.
• * These novel culture systems are crucial for screening potential interventions against Cryptosporidium infection.