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Women under hormonal therapy (HT) often benefit from it but sometimes suffer a setback and develop acyclical pelvic pain. Due to the assumption that mechanisms of neurogenic inflammation are involved in the generation of chronic pelvic pain, we aimed to investigate the expression of sensory nerve markers in EM-associated nerve fibers of patients with\/without HT.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Laparoscopically excised peritoneal samples from 45 EM and 10 control women were immunohistochemically stained for: PGP9.5, Substance P (SP), NK1R, NGFp75, TRPV-1, and TrkA. Demographics and severity of pain were documented.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>EM patients showed a higher nerve fiber density (PGP9.5 and SP) and increased expression of NGFp75, TRPV1, TrkA, and NK1R in blood vessels and immune cells compared with controls. Patients with HT have cycle-dependent pelvic pain but suffer from acyclical pelvic pain. Interestingly, reducing NK1R expression in blood vessels under HT was observed. A correlation between dyspareunia severity and nerve fibers density and between NGFRp75 expression in blood vessels and cycle-dependent pelvic pain severity was observed.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Patients under HT have no ovulation and no (menstrual) bleeding, which correlate with inflammation and cyclical pain. However, acyclical pain seems to be due to peripheral sensitization once it is present under treatment. Neurotransmitters, like SP and their receptors, are involved in mechanisms of neurogenic inflammation, which are relevant for pain initiation. These findings indicate that in both groups (EM with\/without HT), neurogenic inflammation is present and responsible for acyclical pain.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00404-023-07110-9","type":"journal-article","created":{"date-parts":[[2023,7,5]],"date-time":"2023-07-05T05:02:20Z","timestamp":1688533340000},"page":"1327-1340","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Mechanisms of peripheral sensitization in endometriosis patients with peritoneal lesions and acyclical pain"],"prefix":"10.1007","volume":"308","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0788-1640","authenticated-orcid":false,"given":"Renata Voltolini","family":"Velho","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jalid","family":"Sehouli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1095-0048","authenticated-orcid":false,"given":"Sylvia","family":"Mechsner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,7,5]]},"reference":[{"issue":"6","key":"7110_CR1","doi-asserted-by":"publisher","first-page":"1381","DOI":"10.3390\/cells10061381","volume":"10","author":"TM Gruber","year":"2021","unstructured":"Gruber TM, Mechsner S (2021) Pathogenesis of endometriosis: the origin of pain and subfertility. 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