{"paper_id":"b2c8c250-22f0-453c-9f26-5b20c969fe7d","body_text":"Abstract\nIn endometriosis, the lymphatic and immune systems are implicated in disease establishment and progression. The objective of this pilot study was to examine endometrial-like, and for the first time, immune cell populations in lymph nodes associated with deep infiltrating endometriosis (DIE) bowel lesions. Premenopausal women undergoing excision of endometriosis and/or hysterectomy were included. DIE bowel lesion-associated (n = 10) and other pelvic (n = 15) lymph nodes were studied. Samples were immunohistochemically stained for endometrial-like cells (CD10), T cells (CD3, CD4, CD8, and FoxP3), dendritic cells (DC; DC-Lamp and DC-Sign), B cells (CD20, CD79 and plasma), macrophages (CD68), and natural killer cells (NK; CD57). Cell abundance (percentage positive area) and antigen expression (optical density; OD) were quantified. Endometrial-like cells and each immune cell population were present in all studied nodes. The DIE bowel lesion-associated nodes showed features of immune activation, with T cell proliferation (CD3+ area p = 0.007, CD4+ area p = 0.015 compared with other pelvic nodes); and a mixture of helper and regulatory T cells, B cells, DCs, macrophages, and plasma cells present in the paracortex. In DIE bowel lesion-associated compared with other pelvic nodes, CD10+ endometrial-like cells were reduced (percentage positive area p < 0.001, OD p = 0.004). This study provides new insight into lymphatic and immune system involvement in advanced endometriosis. In particular, we have shown evidence of immune activation in DIE lesion-associated nodes. This was despite lower endometrial-like cell numbers compared with other pelvic nodes. 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This study was performed at the Department of Obstetrics, Gynaecology and Neonatology, The University of Sydney.\nAuthor information\nAuthors and Affiliations\nCorresponding author\nEthics declarations\nThis study was approved by the Human Research Ethics Committees of the Sydney Local Health District (Royal Prince Alfred Hospital [RPAH] zone; Protocol number X13-00037, HREC/13/RPAH/52) and the University of Sydney (Project number 2013/496).\nConflict of Interests\nThe authors declare that they have no conflict of interest.\nAdditional information\nPublisher's note\nSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.\nRights and permissions\nAbout this article\nCite this article\nJerman, L.F., Anderson, L., Markham, R. et al. The Lymphatic System in Endometriosis: a Pilot Study of Endometrial-Like Cells and Immune Cell Populations in Lymph Nodes Associated with Deep Infiltrating Bowel Lesions. Reprod. Sci. 27, 977–987 (2020). https://doi.org/10.1007/s43032-020-00171-0\nReceived:\nAccepted:\nPublished:\nVersion of record:\nIssue date:\nDOI: https://doi.org/10.1007/s43032-020-00171-0","source_license":"CC0","license_restricted":false}