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The neural stem cell (NSC) niche in subventricular zone (SVZ) of adult mammalian brain contains dense vascular plexus, where endothelial cells (ECs) regulate NSCs by releasing plenty of angiocrine factors. However, the role of ECs-derived exosomes, a novel type of mediators of intercellular communications, in the regulation of NSCs remains unclear. In the current study, primary NSCs isolated from embryonic mouse brains form more neurospheres when cultured in the presence of human umbilical vein endothelial cells (HUVECs). The supportive role of ECs in the coculture was significantly attenuated when GW4869, a blocker of exosome formation, was included, suggesting that HUVECs-derived exosomes played a significant role in supporting NSCs. In order to investigate the role of ECs-derived exosomes on NSCs, we collected exosomes from HUVECs. We found that HUVECs-derived exosomes could significantly promote the formation of neurospheres by primary murine NSCs. EdU incorporation and TUNEL assays indicated that the proliferation of NSCs increased while apoptosis decreased when cultured in the presence of HUVECs-derived exosomes. NSCs incubated with the HUVECs-derived exosomes maintained their potential of multi-lineage differentiation potentials. The expression of stemness-related genes was up-regulated. These data suggested that ECs-derived exosomes could play an importantly role in NSC niche, and they might be used as a reagent for ex vivo NSC amplification for medical application.
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