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Enteric disease in early childhood inhibits microvillus expression by potential stem cells
M Borg1, A D Phillips, M W Smith
1Department of Electron Microscopy, Queen Elizabeth Hospital for Children, London, U.K.
Insights
Enteric diseases significantly reduce microvillus length in potential stem cells by 30%. In healthy children, microvillus growth occurs early in enterocyte migration, unlike in diseased states where length decreases later.
Area of Science:
- Gastroenterology
- Cell Biology
- Pediatric Medicine
Background:
- Microvillus structure is crucial for nutrient absorption in the small intestine.
- Enterocyte differentiation and migration are key processes in intestinal homeostasis.
- Several pediatric enteric diseases are associated with impaired intestinal function.
Purpose of the Study:
- To compare microvillus development in children with coeliac disease, cow's milk protein intolerance, and microvillus atrophy against healthy controls.
- To investigate the impact of enteric diseases on potential stem cells and enterocyte migration.
- To analyze differences in microvillus growth patterns between healthy children and adults.
Main Methods:
- Analysis of intestinal biopsies from children with specific enteric diseases and healthy controls.
- Quantitative measurement of enterocyte microvillus length.
- Comparison of microvillus development across different stages of enterocyte migration and disease states.
Main Results:
- All studied enteric diseases induced a significant 30% reduction in microvillus length on basal crypt enterocytes (potential stem cells).
- In healthy enterocytes, microvillus growth primarily occurs in the basal villus third, with minimal changes during migration.
- Diseased enterocytes showed constant microvillus length during initial migration, followed by a slight decrease over stunted villi.
Conclusions:
- Enteric diseases disrupt early microvillus development in potential stem cells.
- Microvillus development patterns differ significantly between healthy and diseased states, and between children and adults.
- Findings provide insights into the cellular basis of malabsorption in pediatric enteric diseases.
Abstract:
1. Enterocyte development of microvillus structure has been measured in intestinal biopsies obtained from children suffering from coeliac disease, cow's milk protein intolerance and microvillus atrophy, and the results compared with similar measurements carried out in control children. 2. All types of enteric disease caused a significant 30% reduction in the length of microvilli present on undifferentiated basal crypt enterocytes, here referred to as potential stem cells. 3. Microvillus growth measured in control enterocytes took place mainly over the basal third of the villus. There was then little further change in structure during subsequent enterocyte migration to the villus tip. 4. Microvillus length in diseased tissue remained more or less constant during enterocyte migration to the crypt-villus junction. Microvillus length then decreased slightly during subsequent enterocyte migration over stunted villi. 5. The present results are discussed in relation to the supposed properties of potential stem cells. Comparisons are also made between profiles of microvillus development measured in healthy children and mature adults.