Nces and Peking Union Health-related College, , USA; cChinese Academy of Healthcare Sciences and Peking Union Health-related College, chengdu, China (People’s Republic)Introduction: Evidences suggested that exosomes can transfer genetic material among cells, such as viral nucleic acids, proteins or miRNAs which can mediate transmission of viruses for instance HBV or HCV. It is actually identified that platelet-derived exosomes constitute the big fraction in the circulating plasma which can take part in haemostasis, immunity and development. Whether the virus infected platelet-derived exosomes also can market the transmission of virus has not been reported. The hepatitis E virus (HEV) is one of the most typical causes of acute hepatitis worldwide. Current studies have shown that the exosomes secreted by HEV-infected cells were infectious. Our research have confirmed that HEV can infect platelets, as a result we carried out this study to prove if exosomes secreted by platelets infected with HEV are also infectious, thereby further advertising 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 plus the exosomes had been 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 applied to detect HEV RNA and proteins in exosomes. Positive exosomes have been made use of to infect PLC/PRF/5 cells, observing the PAK1 Purity & Documentation alterations of HEV RNA and proteins within one month. Final results: The in vitro model of HEV-infected platelets was effectively established. The concentration of exosomes secreted by HEV-infected platelets was greater 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 positive exosomes, as well as the concentration of which enhanced after the culture of 1 month. Summary/Conclusion: Our study showed that HEV can promote the secretion of platelet exosomes and these vesicles can establish a productive infection which suggested that the exosomes secreted by platelets not simply play a part in haemostasis, immunity and development, but additionally play a non-negligible part within the transmission in the virus. Funding: 1.CAMS Innovation Fund for Healthcare Sciences (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 PKD3 custom synthesis University of Helsinki, Helsinki, FinlandPF05.Multi organ association mediated by extracellular vesicles secreted from HBV good hepatocyte Ai Kotania and Masatoshi KakizakibaTokai University, Isehara, Japan; bTokai University, College of Medicine, Division of Gastroenterology, Iisehara, JapanIntroduction: Hepatitis B virus (HBV) infected hepatocytes secreted extracellular vesicles which include virion, exosome and incomplete virions for example hallow particles which have only HBs viral antigens but neither capsid and HBV genome. We located that the EVs are taken by monocyte/macrophage which upregulates PDL1, immune checkpoint molecule. (Kakizaki et al PLOS one particular in press).