Abstract
Integral analysis of the development of the epithelium, mesenchyme, and smooth muscle cell (SMC) layers, i.e., the inner circular (IC) and outer longitudinal layers, as well as their relation with the mesentery is necessary to understand macroscopic gut development. We here focused on the proximal duodenum with the characteristic “C”-shaped loop and analyzed the duodenum down to the duodenojejunal flexure in C57BL/6J mouse embryos at embryonic days (E) 13.5, 15.5, and 17.5 by histomorphometric analysis. We examined the angle of the axis of the epithelial lumen, which was oval at E13.5 against the mesentery, along with the epithelial cell nuclear shape, the adjacent mesenchymal cell density in relation to the epithelial lumen axis, and the development of SMC layers. The luminal axis of the oval epithelial lumen at E13.5 rotated clockwise against the mesentery in the proximal duodenum. The shape of epithelial nuclei was longer and thinner at the long axis but shorter and broader at the short axis, whereas mesenchymal density was significantly lower in the area on the luminal long axis than that on the short axis. The number of SMC layers in the IC at E13.5, E15.5, and E17.5 showed a regional difference in relation to the mesentery, but no regional difference along the long axis of the duodenum. These findings suggest that epithelial lumen winding against the mesentery and the corresponding changes in the epithelial cell shape and surrounding mesenchymal density may be involved in the formation of the “C” loop of the proximal duodenum.
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Acknowledgements
The authors are very grateful to Ms. Y. Takeda for her tireless help in sectioning the tissue. This work was supported by MEXT KAKENHI Grant number 23112006.
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Jahan, N., Jahan, E., Rafiq, A.M. et al. Histomorphometric analysis of the epithelial lumen, mesenchyme, smooth muscle cell layers, and mesentery of the mouse developing duodenum in relation with the macroscopic morphogenesis. Anat Sci Int 96, 450–460 (2021). https://doi.org/10.1007/s12565-021-00611-0
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DOI: https://doi.org/10.1007/s12565-021-00611-0