Moreover, we discovered that exosomal miR-9 amounts had been significantly low in plasma examples of NPC sufferers (n?=?110) than in those of healthy handles (Fig. tubule development of HUVECs was analyzed by in vitro pipe development assay and quantified for tubule duration. **, P?P?P?Ywhaz secreted by NPC cells into HUVECs. The result Mirabegron of exosomal miR-9 on cell migration and pipe formation of HUVECs in vivo and vitro was evaluated through the use of migration assay, pipe formation assay and matrigel plug assay, respectively. Bioinformatics evaluation and luciferase reporter assay had been useful to confirm the binding of exosomal miR-9 towards the 3untranslated area (3-UTR) of MDK, while Phosphorylation Array was performed to recognize AKT Pathway in HUVECs treated with exosomal miR-9. Furthermore, Immunohistochemistry (IHC) and in situ hybridization (ISH) was utilized to discovered miR-9, Mirabegron MDK and Compact disc31 appearance in individual NPC tumor examples. Outcomes NPC cells transfected with miR-9-overexpressing lentivirus, released miR-9 in exosomes. Exosomal miR-9 suppressed its target gene – MDK in endothelial cells directly. Mechanistic analyses uncovered that exosomal miR-9 from NPC cells inhibited endothelial pipe development and migration by concentrating on MDK and regulating PDK/AKT signaling pathway. Additionally, the amount of MDK Mirabegron was upregulated in NPC tumor examples and was favorably correlated with microvessel thickness. Notably, the amount of exosomal miR-9 was correlated with general success favorably, and MDK overexpression was connected with poor prognosis in NPC sufferers favorably, suggesting the scientific relevance and prognostic worth of exosomal miR-9 and MDK. Conclusions together Taken, our data recognize an extracellular anti-angiogenic function for tumor-derived, exosome-associated miR-9 in NPC tumorigenesis and fast further analysis into exosome-based therapies for cancers treatment. Electronic supplementary materials The web version of the content (10.1186/s13046-018-0814-3) contains supplementary materials, which is obtainable.