Abstract
The smooth muscle layer (SML) comprises a significant portion of the intestines and other tubular organs. Whereas epithelial development has recently been extensively studied, SML development has drawn relatively less attention. Previous morphological reports revealed that the inner circular layer (IC) differentiates earlier than the outer longitudinal layer (OL), but detailed development of the SML, including chronological changes in the cell layer number, precise cell orientation, and regional differences in relation to the mesentery, has not been reported. We here observed the development of the SML in the C57BL/6J mouse ileum near the ileocecal junction at embryonic day (E) 13.5, 15.5, and 17.5. By histo-morphometric analyses, in IC, smooth muscle cells (SMCs) were oval-shaped and irregularly arranged in 3–4 layers at E13.5, then adopted an elongated spindle shape and decreased to two cell layers at E15.5 and E17.5. The IC SMC nuclear angle was not vertical, but oriented at 60–80° against the mid-axis of the intestinal lumen. The single SMC layer in OL was observed at E17.5, and the SMC nuclear angle was parallel to the luminal mid-axis. No clear regional difference against the mesentery was observed. Collectively, the findings suggest that development and differentiation of the ileal SML is not simple but regulated in a complex manner and possibly related to the macroscopic organogenesis.
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Acknowledgements
We thank Ms. Yumiko Takeda and Mr. Fumio Satow for their technical help. This work was supported by a MEXT KAKENHI Grant (number 23112006).
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Jahan, E., Rafiq, A.M., Matsumoto, A. et al. Development of the smooth muscle layer in the ileum of mouse embryos. Anat Sci Int 96, 97–105 (2021). https://doi.org/10.1007/s12565-020-00565-9
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DOI: https://doi.org/10.1007/s12565-020-00565-9