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Cell proliferation during morphogenesis of the human colon
1Département d'Anatomie et de Biologie Cellulaire, Faculté de Médecine, Université de Sherbrooke, Qué., Canada.
Biology of the Neonate
|January 1, 1989
Summary
Human colon development involves significant cell proliferation, especially in the early stratified epithelium. Proliferation later concentrates in developing crypts as villi form, establishing a distinct pattern by 13 weeks gestation.
Area of Science:
- Developmental biology
- Gastroenterology
- Histology
Background:
- Human colon morphogenesis involves complex cellular changes.
- Understanding fetal colon development is crucial for identifying congenital anomalies.
Purpose of the Study:
- To investigate cell proliferation patterns during human colon development from 8 to 18 weeks gestation.
- To quantify cell proliferation sites and their changes over time.
Main Methods:
- Radioautography using [3H]-thymidine uptake.
- Localization of labeled cells in epithelial, mesenchymal, and muscularis externa layers.
- Biochemical quantitation of DNA labeling.
Main Results:
- High proliferative activity in the stratified epithelium (up to 28% labeling index).
- Proliferation decreased and localized to developing crypts by 14-15 weeks.
- A specific proliferation pattern (epithelium > mesenchyme > muscular layer) established by 13 weeks.
Conclusions:
- Cell proliferation significantly decreases and shifts location during human colon morphogenesis.
- Quantitative data provides a baseline for understanding normal colon development.