Fas and Fas-Ligand in Eutopic and Ectopic Endometrium of Women With Endometriosis: The Possible Immune Privilege of Ectopic Endometrium

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Endometriotic lesions showed significantly stronger Fas-Ligand and weaker Fas expression compared to eutopic endometrium, suggesting immune privilege of ectopic tissue.

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This study examined Fas (Fas receptor) and Fas-Ligand expression in tissue specimens from 33 women with severe endometriosis and 18 women without endometriosis, using immunostaining across menstrual phases and comparing eutopic endometrium versus ectopic endometriotic lesions. Fas-Ligand staining was stronger in eutopic secretory-phase epithelial cells, while ectopic lesions showed significantly stronger Fas-Ligand staining than eutopic tissue regardless of menstrual phase; in parallel, Fas staining in eutopic tissue was reduced during the proliferative phase and strong in the secretory phase, whereas epithelial cells of ectopic endometrium showed reduced Fas staining independently of menstrual phase. The authors interpret the combination of reduced Fas with increased Fas-Ligand in ectopic lesions as suggesting a possible immune-privilege mechanism. The paper’s central relevance is to endometriosis: it directly compares Fas/Fas-Ligand expression in eutopic and ectopic endometrium and proposes an immune-privilege role for ectopic endometriotic tissue in endometriosis.

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Abstract

The Fas/Fas-Ligand system is an important mediator of apoptosis. We analyzed their expression in tissue specimens obtained from 33 women with severe endometriosis and 18 women without endometriosis. Immunostaining for Fas-Ligand in the eutopic endometrium was stronger in the epithelial cells of secretory phase, while the epithelial cells of endometriotic lesions showed a significantly stronger staining for Fas-Ligand independently from the menstrual phase (P < 0.01). Immunostaining for Fas in the eutopic endometrium showed a reduced staining during the proliferative phase, whereas it was strong in the secretory phase. The epithelial cells of the ectopic endometrium showed a reduced staining for Fas independently from the menstrual phase with respect to the eutopic tissue (P < 0.01). The reduced expression of Fas in the ectopic endometrium with the contemporary higher expression of Fas-Ligand in the corresponding cells suggests a possible immune privilege of this tissue.
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Abstract

The Fas/Fas-Ligand system is an important mediator of apoptosis. We analyzed their expression in tissue specimens obtained from 33 women with severe endometriosis and 18 women without endometriosis. Immunostaining for Fas-Ligand in the eutopic endometrium was stronger in the epithelial cells of secretory phase, while the epithelial cells of endometriotic lesions showed a significantly stronger staining for Fas-Ligand independently from the menstrual phase (P < 0.01). Immunostaining for Fas in the eutopic endometrium showed a reduced staining during the proliferative phase, whereas it was strong in the secretory phase. The epithelial cells of the ectopic endometrium showed a reduced staining for Fas independently from the menstrual phase with respect to the eutopic tissue (P < 0.01). The reduced expression of Fas in the ectopic endometrium with the contemporary higher expression of Fas-Ligand in the corresponding cells suggests a possible immune privilege of this tissue. Similar content being viewed by others

References

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Fas and Fas-Ligand in Eutopic and Ectopic Endometrium of Women With Endometriosis: The Possible Immune Privilege of Ectopic Endometrium. Reprod. Sci. 23, 81–86 (2016). https://doi.org/10.1177/1933719115594019 Published: Issue date: DOI: https://doi.org/10.1177/1933719115594019

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endometriosis

MeSH descriptors

Endometriosis Endometrium Fas Ligand Protein fas Receptor Ovarian Diseases Peritoneal Diseases Endometriosis Endometriosis Endometrium Endometrium Epithelial Cells Epithelial Cells Epithelial Cells Fas Ligand Protein fas Receptor Female Humans Menstrual Cycle Menstrual Cycle Ovarian Diseases

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