Smooth muscle differentiation at endometrio-myometrial junction

Shingo Fujii, Ikuo Konishi, Takahide Mori
In: Virchows Archiv A Pathological Anatomy and Histopathology · 1989 · vol. 414(2) , pp. 105–112 · doi:10.1007/bf00718589 · PMID:2492689 · W2928313817
article OA: closed CC0 ⤵ 35 in-corpus citations
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⚙ AI-generated summary by claude@2026-06+body, 2026-06-06 ⓘ

Smooth muscle-like cells were identified at the endometrio-myometrial junction and showed increased smooth muscle characteristics during the luteal phase and early pregnancy.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-06 ⓘ

This study examined the ultrastructure of mesenchymal/endometrial stromal components at the endometrio-myometrial junction (EMJ) across the menstrual cycle and during early pregnancy to determine whether uterine myometrial smooth muscle is newly produced at the adult EMJ. Smooth muscle–like cells were identified among usual endometrial stromal cells in all specimens, resembling myofibroblasts in the follicular phase but displaying more distinct smooth muscle features (e.g., cytoplasmic filaments, dense bodies, and plaques) in the luteal phase and early pregnancy. The authors interpret the morphology changes as suggesting smooth muscle differentiation from multi-potential mesenchymal cells in the endometrial stroma, while the main caveat is that the evidence is ultrastructural and morphological rather than directly demonstrating cell fate or functional integration. This paper is centrally about endometriosis and/or adenomyosis — specifically, it addresses EMJ smooth muscle differentiation relevant to adenomyosis-like junctional pathology.

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