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Understanding how disseminated tumor cells (DTCs), which are often found in proximity to the microvasculature, remain dormant and what regulates their reactivation is one of the major challenges in tumor biology. In a screen for endothelial secreted and plasma membrane proteins able to regulate tumor cell dormancy, we identified the transmembrane protein platelet and endothelial aggregation receptor 1 (PEAR1). Human and murine endothelial cells lacking PEAR1 lost the ability to promote dormancy of different tumor cells, and the extracellular part of PEAR1 was able to rescue this effect. Similarly, in mice lacking PEAR1 in endothelial cells, tumor cell dormancy in the lung was reduced and tumor metastasis was increased. We found that PEAR1 induces tumor cell dormancy by binding lysyl oxidase like 2 (LOXL2) and cathepsin D (CTSD), which both inhibit tumor cell dormancy and promote tumor growth and metastasis. Tumor cells with suppressed CTSD expression showed increased dormancy and decreased metastatic potential in vivo. Our data identify a mechanism underlying tumor cell dormancy and suggest CTSD and LOXL2 as targets for approaches to promote dormancy.<\/jats:p>","DOI":"10.1186\/s12943-025-02488-3","type":"journal-article","created":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T10:08:48Z","timestamp":1762164528000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Lung endothelial PEAR1 induces tumor cell dormancy"],"prefix":"10.1186","volume":"24","author":[{"given":"Kenneth Anthony","family":"Roquid","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adriana","family":"Vucetic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elena","family":"Dyukova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mika J.","family":"Hanssen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haaglim","family":"Cho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u00e9my","family":"Bonnavion","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenny","family":"Mattonet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario","family":"Looso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miloslav","family":"Sanda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boris","family":"Strilic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Offermanns","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,11,3]]},"reference":[{"key":"2488_CR1","doi-asserted-by":"publisher","first-page":"238","DOI":"10.1038\/nrc3910","volume":"15","author":"CM Ghajar","year":"2015","unstructured":"Ghajar CM. 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