Muskelmetaplasie in peritonenalen Endometrioseläsionen
Muscle cells are frequently found in peritoneal, ovarian, deeply infiltrating, and extraperitoneal endometriosis lesions, indicating they are a common component beyond the standard epithelial and stromal cell definition.
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The paper investigates muscle metaplasia in peritoneal endometriotic lesions by analyzing peritoneal endometriosis tissue from 60 premenopausal patients and comparing it with macroscopically unremarkable peritoneum from 10 controls without endometriosis or adenomyosis. Using immunohistochemistry, it identifies smooth muscle cells within all lesions, reporting that they can constitute up to 38% of the lesion tissue, with significantly higher overall muscle content than in control peritoneum. The authors find that endometriosis-adjacent muscle regions show lower expression of differentiation markers (desmin, caldesmon) and functional markers (SM-MHC, OTR, VPR, ER, PR) than more peripheral muscle areas, suggesting a gradient consistent with newly forming or less differentiated cells near lesions. This paper relates to endometriosis—centrally about muscle metaplasia and differentiation/function of smooth muscle cells in peritoneal endometriotic lesions.
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