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Human intestinal development in a severe-combined immunodeficient xenograft model
T C Savidge1, A L Morey, D J Ferguson
1Department of Cellular Physiology, Babraham Institute, Cambridge, UK.
Differentiation; Research in Biological Diversity
|June 1, 1995
Summary
This study used a mouse xenograft model to explore human gastrointestinal development. Human fetal gut tissue successfully developed region-specific structures and cell types in mice, revealing insights into early gut development.
Area of Science:
- Developmental Biology
- Gastroenterology
- Immunology
Background:
- Investigating human gastrointestinal ontogenesis requires suitable models.
- Severe-combined immunodeficient (SCID) mice offer a platform for xenotransplantation studies.
- Understanding early gut development is crucial for regenerative medicine and disease research.
Purpose of the Study:
- To assess the potential of human fetal gut regions to undergo region-specific development after transplantation into SCID mice.
- To characterize host and donor cell types using in situ hybridization.
- To explore the role of non-epithelial cells in regulating epithelial differentiation in vivo.
Main Methods:
- Subcutaneous transplantation of human fetal gut segments into SCID mice.
- Double-label in situ hybridization with human and mouse DNA probes.
- Histological and cellular analysis of xenografted tissues at 10 weeks post-transplantation.
Main Results:
- Human fetal small and large bowel formed characteristic mucosa with region-specific gradients 10 weeks post-transplantation.
- Xenograft epithelium initially resembled early fetal stratified epithelium, with unique differentiation pathways (e.g., fewer Paneth cells, more enteroendocrine cells).
- In situ hybridization confirmed human origin of epithelium and muscle layers; submucosa and lamina propria were chimeric, with human cells interacting mainly with myofibroblasts and intraepithelial lymphocytes.
Conclusions:
- Human fetal gut xenografts in SCID mice can undergo region-specific morphogenesis and cytodifferentiation.
- Non-epithelial cell interactions, particularly with human myofibroblasts and lymphocytes, appear crucial for regulating epithelial differentiation in this model.
- A species-specific cellular 'selection' process may govern these interactions and influence epithelial development in the absence of normal physiological stimuli.