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Elevated matriptase is a consistent feature of epithelial ovarian cancers (OvCa), where multicellular spheroids shed from the primary tumor into the peritoneal cavity are critical drivers of metastasis. Dynamic cell-to-cell adhesive contacts are required for spheroid formation and maintenance. Here, we show that overactive matriptase, reflected in an increased ratio of matriptase to its inhibitor hepatocyte growth factor activator inhibitor 1 (HAI-1), disrupts cell\u2013cell contacts to produce loose prometastatic spheroids that display increased mesothelial cell adhesion and submesothelial invasion. We show that these activities are dependent on the matriptase activation of a protease-activated receptor-2 (PAR-2) signaling pathway involving PI3K\/Akt and MMP9-induced disruption of cell\u2013cell adhesion by the release of the soluble E-cadherin ectodomain. These data reveal a novel pathological connection between matriptase activation of PAR-2 and disruption of cell\u2013cell adhesion, and support the clinical investigation of this signaling axis as a therapeutic strategy for aggressive metastatic OvCa.<\/jats:p>","DOI":"10.1083\/jcb.202209114","type":"journal-article","created":{"date-parts":[[2023,8,15]],"date-time":"2023-08-15T02:21:18Z","timestamp":1692066078000},"update-policy":"https:\/\/doi.org\/10.1083\/jcb.crossmarkpolicy","source":"Crossref","is-referenced-by-count":23,"title":["Matriptase drives dissemination of ovarian cancer spheroids by a PAR-2\/PI3K\/Akt\/MMP9 signaling axis"],"prefix":"10.1083","volume":"222","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6339-3452","authenticated-orcid":true,"given":"Nisha R.","family":"Pawar","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04rq5mt64","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Maryland School of Medicine 1 Center for Vascular 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