High Lymph Vessel Density and Expression of Lymphatic Growth Factors in Peritoneal Endometriosis

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Lymph vessel density and VEGF-C/VEGF-D expression were significantly higher in peritoneal endometriosis lesions compared to healthy peritoneum.

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This study assessed lymph vessel occurrence and lymphangiogenic growth factor expression in peritoneal lesions by immunohistochemically staining peritoneal samples from 37 patients for podoplanin (D2-40), LYVE-1, Prox-1, and VEGF-C/VEGF-D, using von Willebrand factor double-staining in a subset. Compared with healthy peritoneum, peritoneal endometriotic lesions had significantly higher lymph vessel density, with LYVE-1- and Prox-1-positive vessels increased more than D2-40-positive vessels; endometriotic epithelial and stromal cells showed moderate-to-strong VEGF-C/VEGF-D expression, and VEGF-C-/VEGF-D-positive macrophages were observed in endometriotic stromal tissue. A key caveat is that the work is based on immunohistochemical detection and compares lesions to “healthy peritoneum” without further functional validation of lymphatic activity. This paper is centrally about endometriosis — it examines lymphatic vessel density markers and VEGF-C/VEGF-D expression in peritoneal endometriotic lesions.

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Abstract

To investigate the occurrence of lymph vessels and lymphangiogenic growth factors in peritoneal lesions, we performed immunohistochemical staining of peritoneal lesions of 37 patients with antibodies against podoplanin (D2-40), lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1), prospero homeobox protein 1 (Prox-1), vascular epithelial growth factor (VEGF)-C/VEGF-D. Overall, 10 lesions were double stained against D2-40 and von Willebrand factor. The lymph vessel density in peritoneal lesion was significantly higher in comparison with healthy peritoneum. All lymph vessel makers could be detected, whereby the lymph vessel density of LYVE-1- and Prox-1-positive lymph vessels was significantly higher than the lymph vessel density of D2-40-positive lymph vessels. Endometriotic epithelial cells and stromal cells (SCs) showed a moderate-to-strong VEGF-C/VEGF-D expression. The VEGF-C-/VEGF-D-positive macrophages in endometriotic SCs could be observed. The lymphatic vasculature seems to form a further component of peritoneal lesions and could be involved in the inflammatory process. These data demonstrated a further step in the clarification of the pathogenesis of endometriosis.
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Abstract

To investigate the occurrence of lymph vessels and lymphangiogenic growth factors in peritoneal lesions, we performed immunohistochemical staining of peritoneal lesions of 37 patients with antibodies against podoplanin (D2-40), lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1), prospero homeobox protein 1 (Prox-1), vascular epithelial growth factor (VEGF)-C/VEGF-D. Overall, 10 lesions were double stained against D2-40 and von Willebrand factor. The lymph vessel density in peritoneal lesion was significantly higher in comparison with healthy peritoneum. All lymph vessel makers could be detected, whereby the lymph vessel density of LYVE-1- and Prox-1-positive lymph vessels was significantly higher than the lymph vessel density of D2-40-positive lymph vessels. Endometriotic epithelial cells and stromal cells (SCs) showed a moderate-to-strong VEGF-C/VEGF-D expression. The VEGF-C-/VEGF-D-positive macrophages in endometriotic SCs could be observed. The lymphatic vasculature seems to form a further component of peritoneal lesions and could be involved in the inflammatory process. These data demonstrated a further step in the clarification of the pathogenesis of endometriosis. Similar content being viewed by others

References

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endometriosis

MeSH descriptors

Endometriosis Intercellular Signaling Peptides and Proteins Lymphatic Vessels Lymphatic Vessels Peritoneal Diseases Adult Antibodies, Monoclonal, Murine-Derived Biomarkers Biomarkers Endometriosis Endothelial Cells Endothelial Cells Endothelium, Lymphatic Endothelium, Lymphatic Female Fluorescent Antibody Technique Homeodomain Proteins Homeodomain Proteins Humans Immunohistochemistry

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