{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T10:43:48Z","timestamp":1790246628449,"version":"4.1.0"},"reference-count":41,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2002,4,21]],"date-time":"2002-04-21T00:00:00Z","timestamp":1019347200000},"content-version":"vor","delay-in-days":51,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Transfusion"],"published-print":{"date-parts":[[2002,3]]},"abstract":"<jats:p> <jats:bold>BACKGROUND:<\/jats:bold> Blood and plasma of animals experimentally infected with transmissible spongiform encephalopathies (TSEs) can transmit TSE infection by transfusion. A conformational isoform of prion protein (PrPsc) is believed to be the TSE\u2010infectious agent that propagates by converting the cellular prion protein (PrPc) to additional molecules of PrPsc. In orally infected animals, PrPsc accumulates in intestinal endothelial cells. In blood, two thirds of PrPc resides in plasma, but its source is not known.<\/jats:p><jats:p> <jats:bold>STUDY DESIGN AND METHODS:<\/jats:bold> The expression of PrPc in cultured human umbilical vein endothelial cells (HUVECs) was studied using flow cytometry, immunoblotting, and RT\u2010PCR. Flow cytometry was used to characterize endothelial membrane microparticles (MPs) in cell culture supernatants and in normal human plasma.<\/jats:p><jats:p> <jats:bold>RESULTS:<\/jats:bold> HUVECs and bovine aorta endothelial cells express PrPc. The number of surface PrPc molecules per cell in HUVECs was 58,000 \u00b1 2,800. The induction of apoptosis in HUVECs led to a marked release of membrane MPs (60,000\u201080,000 MPs\/10<jats:sup>3<\/jats:sup> cells) that expressed PrPc and other endothelial antigens. The presence of endothelial cell\u2010derived MPs expressing PrPc was demonstrated in platelet\u2010free human plasma.<\/jats:p><jats:p> <jats:bold>CONCLUSION:<\/jats:bold> Endothelial cell apoptosis is associated with the release of PrPc\u2010positive MPs. These MPs contribute to the PrPc pool in plasma and may have a role in disseminating TSE infectivity in blood.<\/jats:p>","DOI":"10.1046\/j.1537-2995.2002.00072.x","type":"journal-article","created":{"date-parts":[[2003,3,12]],"date-time":"2003-03-12T22:49:42Z","timestamp":1047509382000},"page":"334-342","source":"Crossref","is-referenced-by-count":59,"title":["Cellular prion protein is expressed on endothelial cells and is released during apoptosis on membrane microparticles found in human 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