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Herein, we investigated the role of MPs in dengue virus (DENV) infection. Infection of various susceptible cells by DENV led to apoptotic death and MP release. These MPs harbored a viral envelope protein and a nonstructural protein 1 (NS1) on their surfaces.<jats:italic>Ex vivo<\/jats:italic>analysis of clinical specimens from patients with infections of different degrees of severity at multiple time points revealed that MPs generated from erythrocytes and platelets are two major MP populations in the circulation of DENV-infected patients. Elevated levels of red blood cell-derived MPs (RMPs) directly correlated with DENV disease severity, whereas a significant decrease in platelet-derived MPs was associated with a bleeding tendency. Removal by mononuclear cells of complement-opsonized NS1\u2013anti-NS1 immune complexes bound to erythrocytes via complement receptor type 1 triggered MP shedding<jats:italic>in vitro<\/jats:italic>, a process that could explain the increased levels of RMPs in severe dengue. These findings point to the multiple roles of MPs in dengue pathogenesis. They offer a potential novel biomarker candidate capable of differentiating dengue fever from the more serious dengue hemorrhagic fever.<\/jats:p><jats:p><jats:bold>IMPORTANCE<\/jats:bold>Dengue is the most important mosquito-transmitted viral disease in the world. No vaccines or specific treatments are available. Rapid diagnosis and immediate treatment are the keys to achieve a positive outcome. Dengue virus (DENV) infection, like some other medical conditions, changes the level and composition of microparticles (MPs), tiny bag-like structures which are normally present at low levels in the blood of healthy individuals. This study investigated how MPs in culture and patients' blood are changed in response to DENV infection. Infection of cells led to programmed cell death and MP release. In patients' blood, the majority of MPs originated from red blood cells and platelets. Decreased platelet-derived MPs were associated with a bleeding tendency, while increased levels of red blood cell-derived MPs (RMPs) correlated with more severe disease. Importantly, the level of RMPs during the early acute phase could serve as a biomarker to identify patients with potentially severe disease who require immediate care.<\/jats:p>","DOI":"10.1128\/jvi.02207-14","type":"journal-article","created":{"date-parts":[[2014,11,20]],"date-time":"2014-11-20T07:32:20Z","timestamp":1416468740000},"page":"1587-1607","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":47,"title":["Microparticles Provide a Novel Biomarker To Predict Severe Clinical Outcomes of Dengue Virus Infection"],"prefix":"10.1128","volume":"89","author":[{"given":"Nuntaya","family":"Punyadee","sequence":"first","affiliation":[{"name":"Division of Dengue Hemorrhagic Fever Research, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok-noi, Bangkok, Thailand"},{"name":"Graduate Program in Immunology, Department of Immunology, Faculty of Medicine Siriraj Hospital, 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