F how a normal marrow functions to suppress early cancer. As leukemia develops the cross-talk involving AML and its microenvironment alters the MSCs to market a survival signal favouring AML growth. Future function includes the capacity of AML-derived EVs to alter the phenotype of regular marrow towards a pro-leuekmic phenotype. Employing mathematical models to quantify and in the end predict these adjustments enables for precise therapeutic intervention. Funding: This operate was funded by NIH [T32 Grant].PF02.Endocytosis and intracellular trafficking of prostate cancer exosomes Alex Cocks1; Hope Roberts-Dalton1; Philip Lewis1; Jason P. Webber2; Rachel Errington2; Peter Watson1; Arwyn Jones1; Aled ClaytonCardiff University, Cardiff, UK; 2Tissue Microenvironment Group, Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, UKBackground: Prostate cancer exosomes interact with fibroblasts in the tumour microenvironment to stimulate myofibroblast differentiation, generating a stroma that supports tumour growth. We propose that uptake of prostate cancer exosomes and delivery of their cargo for the fibroblast is expected to create this illness advertising phenotype. The microscopy approaches available enable us to figure out the fate of the exosome following uptake. Understanding the uptake kinetics of exosomes and their intracellular trafficking may possibly present insights into how exosomes induce myofibroblast differentiation, and how they may be manipulated therapeutically. Strategies: A novel thiol based labelling technique was carried out to permit visualization and quantification of exosomes taken up by fibroblasts, by fluorescence microscopy and flow cytometry respectively. The endocytic routes used by exosomes to gain entry to fibroblasts was determined utilising siRNA mediated knockdowns of endocyticFriday, 04 Mayregulators, and intracellular trafficking in the exosomes was monitored by time-lapse microscopy. Outcomes: Fluorescent thiol labelling makes it possible for visualization of exosomes, but does not have an effect on the exosome function with respect to myofibroblast differentiation. Exosomes are taken up by fibroblasts by means of Clathrin mediated endocytosis and visitors towards lysosomes. Modulation of exosome uptake via interference with all the exosome surface is ongoing. Summary/Conclusion: Endocytosis of exosomes may be perturbed by targeting regulators of endocytosis, too as proteins on the exosome surface revealing that uptake of exosomes by fibroblasts might be modulated. Utilising IL-6 Inhibitor drug diverse microscopy procedures clarifies the fate in the exosome inside the fibroblast. The impact of uptake inhibition on the capability for fibroblasts to differentiate into pro-tumoural myofibroblasts is currently becoming examined. Funding: This project is funded by Tenovus Cancer CarePF02.Lysosomal inhibition in triple-negative breast cancer cells alters exosome HSV-1 Inhibitor drug composition and function Jing Xu1; Shane Colborne1; Elham Hosseini-Beheshti2; Emma Guns3; Gregg Morin4; Sharon Gorski1Canada’s Michael Smith Genome Sciences Centre, Vancouver, Canada; Vancouver Prostate Centre, Sydney, Australia; 3Vancouver Prostate Centre, Vancouver, Canada; 4Canada’s Michael Smith Genome Sciences Centre, Vancouver, CanadaBackground: Viruses are capable of manipulating host endosomal-exosomal pathways which can aid in tumourigenesis. Human papilloma virus (HPV) encoded proteins can alter the production and cargo of extracellular vesicles (EVs) secreted by cervical cancer cells. Nonetheless, the ext.