Ls, including MSCs. Here, we evaluated lymphangiogenic prospective and PKD1 list essential exosomal prolymphangiogenic things of human umbilical cord MSC-derived PAK6 manufacturer exosomes (hucMSC-Ex) to offering a mechanistic basis for optimizing future hucMSCEx-based lymphedema therapies. Procedures: hucMSC-Ex have been extracted from condition medium of hucMSCs. Utilizing a murine lymphedema model, we evaluated oedema at numerous time points post hucMSC-Ex injection. HE stain and Immunohistochemical stain were applied to analyse the lymphaniogenesis. In vitro, human dermal lymphatic endothelial cells (HDLECs) had been treated with hucMSC-Ex, and cell proliferation, migration and tube formation have been assayed working with cell counting Kit-8 (CCK-8), transwell chamber inserts, and matrigelbased tube formation assays, respectively. Western blot and immunofluorescence stain had been performed to test the expression level of proteins which were related with lymphaniogenesis after co-cultured with hucMSC-Ex in HDLECs. Results: Mice treated with hucMSC-Ex showed considerably decreased oedema formation and restored drainage of intradermally injected methylene blue soon after six weekly injections. HE stain showed subcutaneous oedema of tail faded clearly after hucMSC-Ex injection. Immunohistochemical evaluation revealed that mice tails receiving hucMSC-Ex injections had enhanced lymphangiogenesis in comparison with the PBS-treated groups as determined by staining of lymphatic marker LYVE-1. The proliferation, migration, and tubeJOURNAL OF EXTRACELLULAR VESICLESformation of HDLECs have been significantly enhanced by hucMSC-Ex. Also, the expression level of Ang-2, Lyve1, Prox1, VEGFR3, p-Akt in HDLECs was up-regulated each in western blot and Immunofluorescence stain. Mechanically, hucMSC-Ex derived Ang-2 and Tie2 proteins have been transferred to HDLECs. Ang-2 controlled the proliferation, migration and tube formation of HDLECs. And hucMSC-Ex delivered Ang-2 and Tie2 activated the expression of lymphangiogenic aspects.Summary/Conclusion: Ang-2 and Tie2 are essential for hucMSC-Ex effects on lymphangiogenesis in vitro and in vivo. Funding: Zhenjiang Key Laboratory of Exosomes Foundation and Transformation Application Hightech Research,china: (ss2018003);National All-natural Science Foundation of China: (81670549)ISEV2019 ABSTRACT BOOKSymposium Session 14: Parasite and Bacterial EVs Chairs: Yong Song Gho; Mariko Ikuo Location: Level B1, Hall A 08:300:OF14.Macrophage-derived exosomes encapsulate Salmonella antigens and stimulate the activation of Form 1 T-helper cells in vivo Winnie W. Huia, Mark Oub, Beata Clappc, David Pascualc and Mariola Edelmannaa University of Florida Dept of Microbiology and Cell Science, Gainesville, USA; bUniversity of Florida Dept of Microbiobiology and Cell Science, Gainesville, USA; cUniversity of Florida Dept of Infectious Disease, Gainesville, USAIntroduction: Salmonella enterica serovar Typhimurium is often a Gram-negative, intracellular bacterium which invades macrophages and results in the production of pro-inflammatory exosomes. S. Typhimurium would be the causative agent of salmonellosis affecting 1.two million people annually within the USA. You will discover no FDA authorized vaccines against nontyphoidal Salmonella infections for human hence showing a significant limitation in present prevention approaches. Exosomes are a subclass of extracellular vesicles characterized by their size, morphology and biogenesis. The cargo, such as protein, nucleic acids and metabolites, carried by exosomes differ according to the physiologica.