Ventral mouse V-SVZ cells exhibit higher mTORC1 activity than dorsal cells and are responsive to rapamycin. Ventral mouse V-SVZ cells exhibit higher mTORC1.

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Ventral mouse V-SVZ cells exhibit higher mTORC1 activity than dorsal cells and are responsive to rapamycin. Ventral mouse V-SVZ cells exhibit higher mTORC1 activity than dorsal cells and are responsive to rapamycin. (A) Representative histograms (from individual cultures) and graphs of median fluorescence intensity, relative to unstained samples, of phosphorylated proteins measured by flow cytometry. Dorsal: top and ventral: bottom. Each dot on graph represents an independent biological replicate (one culture from a P2 mouse). Left scale: log10 and right scale: arcsinh transformed values. Events indicating mTORC1 activity are significantly elevated in ventral cells (p-4EBP1 T37/46, P < 0.0001; p-S6 S240/244, P = 0.0005; p-STAT3 S727, P = 0.0026), whereas other events do not differ (p-S6 S235/236, P = 0.1617). A difference of 0.4 (as in the case of p-4EBP1) on the arcsinh scale represents an approximately twofold difference in total phosphorylated epitope levels per cell. Paired t tests were used. (B) Representative histograms (top) and graphs (bottom) of unstained (US), vehicle-treated (VEH), and rapamycin-treated (RAPA) dorsal (left) and ventral (right) cultures for the indicated phosphoproteins. The median fluorescence intensity for each phosphoprotein is graphed using a standard log10 scale (left) and the arcsinh-transformed scale (right), with both vehicle and rapamycin-treated samples shown relative to unstained cells. Both dorsal and ventral cultured NSPCs respond to rapamycin treatment (30 nM, 24 h) showing decreased signal compared with vehicle (30 nM DMSO, 24 h). Paired t tests were conducted comparing VEH with RAPA: dorsal p-4EBP1 T37/46 (P = 0.0083), p-S6 S240/244 (P = 0.0309), p-S6 S235/236 (0.0092); ventral p-4EBP1 T37/46 (0.0018), p-S S240/244 (0.0157), p-S6 S235/236 (0.0188). N = 4, each N represents cells cultured from an individual P2 mouse. (C) Representative images of dorsal and ventral cultured NSPCs stained for nuclei (DAPI, blue) and OPP (red), which labels newly translated proteins; left (merged image), right (individual grayscale images). Middle: representative images of dorsal and ventral cultured NSPCs pretreated for 30 min with 100 μg/ml cycloheximide (CH), an inhibitor of protein synthesis. Right: box and whisker plot showing quantification of median OPP pixel intensity for each condition (arbitrary units). Scale bars, 50 μm. N = 3 for vehicle-treated, N = 1 for CH-treated. Each N = cells from an individual P2 mouse. Repeated measures ANOVA was conducted in GraphPad Prism (P < 0.0001) followed by Sidak’s multiple comparisons test. For all graphs, bars represent mean ± SD. Gabrielle V Rushing et al. LSA 2019;2:e201800218 © 2019 Rushing et al.