Nces and Peking Union Health-related College, , USA; cChinese Academy of Medical Sciences and Peking Union Healthcare College, chengdu, China (People’s Republic)Introduction: Evidences recommended that exosomes can transfer genetic material between cells, such as viral nucleic acids, proteins or miRNAs which can mediate transmission of viruses for PDE11 medchemexpress example HBV or HCV. It is recognized that platelet-derived exosomes constitute the major fraction within the circulating plasma which can take part in haemostasis, immunity and development. Irrespective of whether the virus infected platelet-derived exosomes can also market the transmission of virus has not been reported. The hepatitis E virus (HEV) is one of the most common causes of acute hepatitis worldwide. Recent studies have shown that the exosomes secreted by HEV-infected cells had been infectious. Our studies have confirmed that HEV can infect platelets, therefore we performed this study to prove if exosomes secreted by platelets infected with HEV are also infectious, thereby additional promoting the transmission of HEV. Strategies: An in vitro model of HEV-infected platelets had been established by HEV-G3 virus strain and washed human platelets as well as the exosomes were isolated from HEV-infected and uninfected platelet by differential centrifugation and magnetic bead separation. Exosomes have been characterized by Western Blot and TEM, and quantitated by NTA. qRT-PCR and ELISA had been utilised to detect HEV RNA and proteins in exosomes. Positive exosomes were utilised to infect PLC/PRF/5 cells, observing the alterations of HEV RNA and proteins inside one month. Results: The in vitro model of HEV-infected platelets was successfully established. The concentration of exosomes secreted by HEV-infected platelets was higher than uninfected platelets. Exosomes isolated from HEV-infected platelets contained HEV RNA andJOURNAL OF EXTRACELLULAR VESICLESproteins. HEV RNA and proteins were detected in cells and supernatant of PLC/PRF/5 cells infected with constructive exosomes, and the concentration of which increased right after the culture of one month. Summary/Conclusion: Our study showed that HEV can market the secretion of platelet exosomes and these vesicles can establish a productive infection which suggested that the exosomes secreted by platelets not only play a role in haemostasis, immunity and improvement, but additionally play a non-negligible role within the transmission on the virus. Funding: 1.CAMS Innovation Fund for Medical Sciences (T-type calcium channel manufacturer CIFMS2016-I2M-1-018) 2. Supported by the Fundamental Research Funds for the Central Universities(Item No:3332018125)roles in HBV hepatitis through the multiorgan association of liver, bone marrow and gut. Funding: AMED hepatitis grant.PF05.HIV-1 Nef mediated Hck kinase activation triggers loading of TACE into EVs in a ceramide-dependent manner Zhe Zhao, Riku Fagerlund and Kalle Saksela University of Helsinki, Helsinki, FinlandPF05.Multi organ association mediated by extracellular vesicles secreted from HBV optimistic hepatocyte Ai Kotania and Masatoshi KakizakibaTokai University, Isehara, Japan; bTokai University, School of Medicine, Department of Gastroenterology, Iisehara, JapanIntroduction: Hepatitis B virus (HBV) infected hepatocytes secreted extracellular vesicles which include virion, exosome and incomplete virions which include hallow particles which have only HBs viral antigens but neither capsid and HBV genome. We discovered that the EVs are taken by monocyte/macrophage which upregulates PDL1, immune checkpoint molecule. (Kakizaki et al PLOS a single in press).