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Based on the aforementioned background, we analyzed the effects of ARA and DHA on NSPCs in proliferation and differentiation conditions using neurosphere assays. http://www.selleckchem.com/products/Imatinib-Mesylate.html Here, we show that ARA promotes the maintenance of neurogenic NSPCs and also increases the number of astrocytes derived from gliogenic NSPCs. In contrast, DHA promotes the maintenance of both neurogenic and gliogenic NSPCs and also increases the number of neurons derived from gliogenic NSPCs. First, we confirmed whether NSPC marker molecules were expressed in culturing neurospheres. Twelve hours after culturing in media hormone mixture (MHM) with epidermal growth factor (EGF) and fibroblast growth factor-basic (bFGF), the plated cells from primary neurospheres were positive for the NSPC markers nestin (98.0?��?1.0%) and Sox2 (99.0?��?0.6%) (Fig.?S1A, B in Supporting Information). There were only a few cells that were positive for the neuronal marker ��-III tubulin (1.1?��?0.8%) or for the astrocyte marker glial fibrillary acidic protein (GFAP) (0.5?��?0.3%) in this condition (Fig.?S1C, D in Supporting Information), whereas more cells were immunoreactive for ��-III tubulin and GFAP in the differentiation condition (see below). The plated cells from tertiary neurospheres http://www.selleck.cn/products/mi-773-sar405838.html were also positive for nestin (96.1?��?0.3%) and Sox2 (98.6?��?0.3%), and no cells were positive for ��-III tubulin (Fig.?S1E�CG in Supporting Information). These cells were also positive for GFAP (94.5?��?0.7%) (Fig.?S1H in Supporting Information). GFAP is another marker for NSPCs and is expressed in late neurospheres, whereas early neurospheres do not express GFAP in proliferation condition [reviewed by Pevny & Rao (2003)]. These results show that NSPC markers are actually expressed in neurospheres. Consequently, we considered these cultured cells to be NSPCs. Neurons and astrocytes in the cortex are derived from common multipotent NSPCs that subsequently pass through phases of proliferation, neurogenesis and gliogenesis. The neurogenic-to-gliogenic fate switch can be observed even within the clones of single NSPC in culture (Qian http://www.selleckchem.com/products/VX-770.html et?al. 2000). In our neurosphere culture system, we also observed that primary neurospheres differentiated mainly into neurons (Fig.?2B, C, E, F) and that gliogenesis was activated in subsequent generations of neurospheres (Fig.?4B, C, E, F). In this study, we regarded primary neurospheres as neurogenic NSPCs and tertiary neurospheres as gliogenic NSPCs and assessed the effects of ARA and DHA on both types of NSPCs using primary and tertiary neurospheres. To examine the effects of ARA and DHA on the maintenance of neurogenic NSPCs, cells from primary neurospheres were cultured with various concentrations of ARA or DHA. ARA increased the number of secondary neurospheres at 10?6?m (P?