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Morphological changes and cellular proliferation in mouse colon during fetal and postnatal development
D Ménard1, P Dagenais, R Calvert
1Département d'anatomie et de biologie, cellulaire, Faculté de médecine, Université de Sherbrooke, Québec, Canada.
The Anatomical Record
|March 1, 1994
Summary
Mouse colon development differs regionally. The proximal colon forms folds with specialized cells, while the distal colon develops flat mucosa with distinct crypts, showing regional cellular proliferation changes.
Area of Science:
- Developmental biology
- Gastroenterology
- Cellular biology
Background:
- Understanding mouse colon development is crucial for studying gastrointestinal diseases.
- Regional differences in colon structure and cell proliferation are not fully characterized during development.
Purpose of the Study:
- To document regional structural and cellular proliferation changes in the developing mouse colon.
- To compare proximal and distal colon development from fetal to weanling stages.
Main Methods:
- Analysis of mouse colon tissues (fetal, suckling, weanling) using light microscopy (LM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM).
- Cellular proliferation assessed via [3H]-thymidine incorporation studies and radioautography.
- Proximal and distal colon segments studied independently across all age groups.
Main Results:
- Proximal colon: V-shaped mucosal folds present at gestation, evolving into specialized absorptive cells. Rudimentary crypts form from cell aggregates, maturing by day 16 with midcrypt proliferation.
- Distal colon: Flat mucosa with short crypts at birth, developing further. Proliferation remains at the crypt base until day 16, lacking specialized cells seen in the proximal segment.
Conclusions:
- Significant regional differences exist in mouse colon development, affecting mucosal structure and cell differentiation.
- Proximal colon exhibits complex fold development and specialized cell differentiation, contrasting with the distal colon's simpler crypt formation and proliferation patterns.