S show CLIC4 preferentially expressed in tumour stroma of a number of subtypes using the exception of ovarian serous adenocarcinomas, exactly where it really is upregulated in each compartments. In vivo, CLIC4 levels enhanced in EVs released in to the peritoneal cavity as tumour burden enhanced inside a heterotopic xenograft ovarian cancer model. In addition, CLIC4 levels in EVs isolated from plasma increased with tumour burden and lung metastatic load in an orthotopic syngeneic mouse breast cancer model. To dissect the contribution of stromal vs. tumour epithelial compartments because the supply with the EVs, CLIC4 was deleted in breast cancer cell lines by CRISPR/Cas9. CLIC4 in circulating EVs is reduced in CLIC4 KO tumour-bearing mice when compared to WT, indicating that the main contribution of CLIC4 into circulation is from tumour epithelium. CLIC4 levels in EVs from biological fluids may perhaps have value as a cancer biomarker, in conjunction with other markers, to detect or analyse tumour progression or recurrence.Scientific Plan ISEVPoster Session F02 EV Isolation: Developments Chairs: Charles Lai and TBDPF02.Evolution of next generation affinity-based extracellular vesicle isolation technologies for liquid biopsy and therapeutic purposes S astien Fournier1, Ian C. Chute2, Annie-pier Beauregard2, Catherine Taylor1, David Barnett2, Andrew Joy2, Nguyet Nguyen1, Biji Anish1, Jeremy Roy1, Awanit Kumar2, Sheena Fry2, Nicolas Crapoulet3, Morgan Brianne Dawn Stephenson1, Simi Chacko2, Sami Benzina2, Remi Richard1, Macrophage-Inducible C-Type Lectin/CLEC4E Proteins web Stephen M. Lewis4, Thyroxine-Binding Globulin Proteins custom synthesis Rodney J. Ouellette4 and Anirban Ghosh5 Atlantic Cancer Analysis Institute, New Brunswick, Canada; 2Atlantic Cancer Analysis Institute, New Brunswick, Canada; 3Department of Chemistry and Biochemistry, Faculty of Medicine, Universitde Sherbrooke, Quebec, Canada; 4Department of Chemistry and Biochemistry, Universitde Moncton, New Brunswick, Canada; 5Department of Chemistry and Biochemistry, Universitde Moncton, New Brunswick, Canada5:15:30 p.m.Introduction: Provided the tremendous possible of circulating extracellular vesicles (EVs) for liquid biopsy and therapeutic applications, there’s a terrific demand for uncomplicated, robust and clinically-adaptable EV isolation procedures. Ultracentrifugation, ultrafiltration and antibody-based EV isolation techniques give drastically less yield in comparison with polymer-based EV precipitation. At present obtainable polymer-based EV isolation solutions are toxic and non-specific, thereby hindering therapeutic and diagnostic applications. To address these challenges we have developed and validated next generation affinity-based EV capture technologies that use a synthetic peptide (Vn96) or non-toxic clinically-approved polysaccharides. Techniques: We’ve got applied electron microscopy, atomic force microscopy, nanoparticle tracking evaluation, immunoblotting, cellular uptake assays, a cellular tra/nsformation assay, proteomic evaluation and nucleic acid detection to analyse the EVs isolated working with our affinity-capture procedures. Results: The Vn96 peptide provides an easy and efficient EV isolation strategy working with only smaller bench-top centrifugation for precipitation, and is also amenable to bead-based batch purification. Similarly, hyaluronic acid and chitosan-based affinity purification of EVs were developed, validated and advanced for therapeutic isolation of EVs. We found superior efficacy of our methods for multiparametric downstream molecular analyses of nucleic acid and protein biomarkers, which enables liquid biopsy assays for limited.