F how a typical marrow works to suppress early cancer. As leukemia develops the cross-talk among AML and its microenvironment alters the MSCs to promote a survival signal favouring AML development. Future operate involves the capacity of AML-derived EVs to alter the phenotype of standard marrow towards a pro-leuekmic phenotype. Employing mathematical models to quantify and eventually predict these alterations allows for precise therapeutic intervention. Funding: This work 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; HIV-2 Inhibitor manufacturer 2Tissue Microenvironment Group, Division of Cancer and Genetics, College of Medicine, Cardiff University, Cardiff, UKBackground: Prostate cancer exosomes interact with fibroblasts in the tumour microenvironment to stimulate myofibroblast differentiation, producing a stroma that supports tumour development. We propose that uptake of prostate cancer exosomes and delivery of their cargo towards the fibroblast is essential to generate this disease promoting phenotype. The microscopy strategies readily available enable us to ascertain the fate from the exosome following uptake. Understanding the uptake kinetics of exosomes and their intracellular trafficking may possibly offer insights into how exosomes induce myofibroblast differentiation, and how they might be manipulated therapeutically. Procedures: A novel thiol primarily based labelling approach was carried out to permit visualization and quantification of exosomes taken up by fibroblasts, by fluorescence microscopy and flow cytometry respectively. The endocytic routes utilized by exosomes to acquire entry to fibroblasts was determined utilising siRNA mediated knockdowns of endocyticFriday, 04 Mayregulators, and intracellular trafficking from the exosomes was monitored by time-lapse microscopy. Outcomes: Fluorescent thiol labelling allows visualization of exosomes, but will not affect the exosome function with respect to myofibroblast differentiation. Exosomes are taken up by fibroblasts by means of Clathrin mediated endocytosis and traffic towards lysosomes. Modulation of exosome uptake by way of interference with the exosome surface is ongoing. Summary/Conclusion: Endocytosis of exosomes may be perturbed by targeting regulators of endocytosis, also as proteins on the exosome surface revealing that uptake of exosomes by fibroblasts might be modulated. Utilising diverse microscopy techniques clarifies the fate with the exosome within the fibroblast. The influence of uptake inhibition on the capacity for fibroblasts to differentiate into pro-tumoural myofibroblasts is presently being examined. Funding: This project is funded by Tenovus Cancer CarePF02.Lysosomal inhibition in triple-negative breast cancer cells alters exosome composition and function Jing Xu1; Shane Colborne1; Elham Hosseini-Beheshti2; Emma Guns3; Gregg Morin4; Sharon Gorski1Canada’s Michael Smith CaMK II Activator review 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. Even so, the ext.