{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T04:29:00Z","timestamp":1790224140273,"version":"4.1.0"},"reference-count":60,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2024,10,30]],"date-time":"2024-10-30T00:00:00Z","timestamp":1730246400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002347","name":"BMBF","doi-asserted-by":"publisher","award":["02NUK064A"],"award-info":[{"award-number":["02NUK064A"]}],"id":[{"id":"10.13039\/501100002347","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002347","name":"BMBF","doi-asserted-by":"publisher","award":["AZ-1568-22"],"award-info":[{"award-number":["AZ-1568-22"]}],"id":[{"id":"10.13039\/501100002347","id-type":"DOI","asserted-by":"publisher"}]},{"name":"BAYCELLator","award":["02NUK064A"],"award-info":[{"award-number":["02NUK064A"]}]},{"name":"BAYCELLator","award":["AZ-1568-22"],"award-info":[{"award-number":["AZ-1568-22"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Stress-inducible heat shock protein 70 (Hsp70), which functions as a molecular chaperone and is frequently overexpressed in different cancer cell types, is present on the cell surface of tumor cells and is actively released into the circulation in free and extracellular lipid vesicle-associated forms. Since the exact pathomechanism of endometriosis has not yet been elucidated (although it has been associated with the development of endometrial and ovarian cancer), we asked whether extracellular Hsp70 and circulating endometriotic cells (CECs) reflect the presence and development of endometriosis. Therefore, circulating levels of free and lipid microvesicle-associated Hsp70 were measured using the Hsp70-exo ELISA, and the presence of circulating CECs in the peripheral blood of patients with endometriosis was determined using membrane Hsp70 (mHsp70) and EpCAM monoclonal antibody (mAb)-based bead isolation approaches. Isolated CECs were further characterized by immunofluorescence using reagents directed against cytokeratin (epithelial marker), CD45 (leukocyte marker), CD105\/CD44 (mesenchymal stemness markers) and by comparative RNA analysis. Similar to the situation in patients with cancer, the levels of circulating Hsp70 were elevated in the blood of patients with histologically proven endometriosis compared to a healthy control cohort, with significantly elevated Hsp70 levels in endometriosis patients with lesions outside the uterine cavity. Moreover, CECs could be isolated using the cmHsp70.1 mAb-based, and to a lesser extent EpCAM mAb-based, bead approach in all patients with endometriosis, with the highest counts obtained using the mHsp70-targeting procedure in patients with extra-uterine involvement. The longevity in cell culture and the expression of the cytokeratins CD105 and CD44, together with differentially expressed genes related to epithelial-to-mesenchymal transition (EMT), revealed similarities between mHsp70-expressing CECs and circulating tumor cells (CTCs) and suggest a mesenchymal stem cell origin. These findings support the involvement of mHsp70-positive stem cell-like cells in the development of endometriotic lesions. In summary, elevated levels of Hsp70 and CECs in the circulation could serve as liquid biopsy markers for endometriosis with extra-uterine involvement and help to elucidate the underlying pathomechanism of the disease.<\/jats:p>","DOI":"10.3390\/ijms252111643","type":"journal-article","created":{"date-parts":[[2024,10,30]],"date-time":"2024-10-30T12:25:39Z","timestamp":1730291139000},"page":"11643","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Extracellular Hsp70 and Circulating Endometriotic Cells as Novel Biomarkers for Endometriosis"],"prefix":"10.3390","volume":"25","author":[{"given":"Christiane","family":"Guder","sequence":"first","affiliation":[{"name":"Department of Otholaryngology, Head and Neck Surgery, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soraya","family":"Heinrich","sequence":"additional","affiliation":[{"name":"Department of Gynecology and Obstetrics, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanadin","family":"Seifert-Klauss","sequence":"additional","affiliation":[{"name":"Department of Gynecology and Obstetrics, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4237-2657","authenticated-orcid":false,"given":"Marion","family":"Kiechle","sequence":"additional","affiliation":[{"name":"Department of Gynecology and Obstetrics, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9455-0780","authenticated-orcid":false,"given":"Lisa","family":"Bauer","sequence":"additional","affiliation":[{"name":"Radiation Immuno-Oncology, TranslaTUM\u2014Central Institute for Translational Cancer Research, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"},{"name":"Department of Radiation Oncology, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rupert","family":"\u00d6llinger","sequence":"additional","affiliation":[{"name":"Institute of Molecular Oncology and Functional Genomics, TranslaTUM\u2014Central Institute for Translational Cancer Research, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0166-1367","authenticated-orcid":false,"given":"Andreas","family":"Pichlmair","sequence":"additional","affiliation":[{"name":"Department of Virology, TranslaTUM\u2014Central Institute for Translational Cancer Research, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marie-Nicole","family":"Theodoraki","sequence":"additional","affiliation":[{"name":"Department of Otholaryngology, Head and Neck Surgery, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"},{"name":"Department of ENT, Head and Neck Surgery, University Hospital Ulm, Albert Einstein-Allee 23, 89070 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Veena","family":"Ramesh","sequence":"additional","affiliation":[{"name":"Department of Otholaryngology, Head and Neck Surgery, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ali","family":"Bashiri Dezfouli","sequence":"additional","affiliation":[{"name":"Department of Otholaryngology, Head and Neck Surgery, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3062-459X","authenticated-orcid":false,"given":"Barbara","family":"Wollenberg","sequence":"additional","affiliation":[{"name":"Department of Otholaryngology, Head and Neck Surgery, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9593-6431","authenticated-orcid":false,"given":"Alan Graham","family":"Pockley","sequence":"additional","affiliation":[{"name":"John van Geest Cancer Research Centre, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2616-3137","authenticated-orcid":false,"given":"Gabriele","family":"Multhoff","sequence":"additional","affiliation":[{"name":"Radiation Immuno-Oncology, TranslaTUM\u2014Central Institute for Translational Cancer Research, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 21, 81675 Munich, Germany"},{"name":"Department of Radiation Oncology, TUM University Hospital, School of Medicine and Health, Technical University Munich, Ismaningerstr. 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