Ns, at the same time as autophagy-related proteins like LC3 and p62, within the EV fraction of your culture media. We also located that inhibitor treatment facilitates secretion of EVs distinct from exosomes in size, and that these EVs are involved in secretion of ubiquitinated proteins. Interestingly, analysis of knockout cells deficient for autophagy-related proteins revealed that the things in the initiation step of autophagy are necessary for EVmediated secretion of ubiquitinated proteins.ISEV2019 ABSTRACT BOOKSummary/Conclusion: These final results indicate that autophagy impairment promotes secretion of ubiquitinated proteins via EVs. Our information give the mechanistic link amongst the autophagy/lysosome pathway and vesicle secretion. We propose that cells may make use of the EV-mediated secretion as an option pathway to preserve protein homeostasis when cellular proteostasis machinery is functionally impaired. Funding: This operate was supported by JST; by KAKENHI (18H02585); by The Asahi Grass Foundation and the Tokyo Biochemical Investigation Foundation.miRNAs, four miRNAs altered the EV secretion in both cell lines, HCT116 and A549. Summary/Conclusion: A number of these target genes have reported as endosomal pathway associated protein and shown the up-regulation in cancer cells. These findings recommend that the identification of target genes of these miRNAs offers the new insight in to the cancer cell communication together with the microenvironmental cells, which leads to a promising therapeutic method against cancer progression.PF07.04 PF07.Identifying the miRNAs related with EV Secretion from cancer cell lines Tomofumi Yamamotoa, Nobuyoshi Kosakab, Fumihiko Urabea, Yutaka Hattoric and Takahiro Ochiyab Division of Molecular and Cellular Medicine, National Cancer Center Analysis Institute, Tokyo, Japan; bDepartment of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Health-related University, PAR2 Storage & Stability Shinjyuku-ku, Japan; cClinical Physiology and Therapeutics, Keio University Faculty of Pharmacy, Tokyo, JapanaRas Tumour microvesicles biogenesis and signalling in drosophila Vakil Ahmad, Carson Broeker, Kayla Calandro and Yves Chiswili. Chabu University of Missouri, Columbia, USAIntroduction: Extracellular vesicles (EVs) derived from cancer cells contribute to their surrounding microenvironmental cells for their benefit. Our group has previously shown that inhibiting the EVs production attenuated the angiogenesis within the tumour, resulting in the suppression of metastasis. Hence, understanding the mechanisms of EV secretion may possibly contribute for the regulation of EVmediated cancer progression. Even so, the precise mechanism of EV secretion in cancer cells remains unclear. The purpose of this study is always to elucidate the unknown mechanisms of EV secretion in cancer cells. To reveal this, microRNAs (miRNAs), which regulate several genes, are 5-HT5 Receptor Agonist Molecular Weight employed. Strategies: To determine the EV secretion linked miRNAs, miRNA-based screening method was established. Combined with ExoScreen, which is ultra-sensitive detection system of EV by measuring surface protein of EVs, such as CD9 and CD63, miRNAbased screening was performed in colorectal cancer cell line, HCT116, and lung cancer cell line, A549. The outcomes from the screening had been confirmed by the nanoparticle tracking analysis. Candidate genes of these miRNAs have been chosen by in silico evaluation. Final results: From the initial 1728 miRNAs, we identified 13 miRNAs which are connected with EV secretion in each cell lines. Then, the target.