Prazosin inhibits GIC survival

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The anti ‐ hypertensive drug prazosin inhibits glioblastoma growth via the PKCδ ‐ dependent inhibition of the AKT pathway by Suzana Assad Kahn, Silvia.

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Prazosin inhibits GIC survival Prazosin inhibits GIC survival Viability analysis of GICs treated with the α‐AR antagonists prazosin, ARC 239, doxazosin, BMY 7378, and terazosin. GICs were treated with the antagonists or corresponding vehicles for 72 h, and viability was assayed using WST‐1. *P < 0.05, n = 4, two‐sided Mann–Whitney U‐test.Quantification of GIC survival using trypan blue exclusion after 24 and 72 h of treatment with prazosin. *P = 0.0286, n = 4, two‐sided Mann–Whitney U‐test.Viability analysis of patient‐derived GICs (TG1, TG16, GBM5, GBM44) and NSCs (NSC24, NSC25, NSC5031, NSC8853) treated with prazosin for 72 h. *P = 0.0286, n = 4, two‐sided Mann–Whitney U‐test.Analysis of the sphere‐forming capabilities of GICs using the extreme limiting dilution assay. Cells were seeded in presence of vehicle or 30 µM prazosin (PRZ). Sphere formation was scored 10 days post‐seeding. Frequency of sphere‐forming cells: Control = 1/3.88 (lower 8.61, upper 1.95); prazosin 1/248 (lower 1,003, upper 62), n = 12, P = 1.13 × 10−10. Overall test for difference in stem cell number between groups.Viability analysis of GICs treated with prazosin after sorting cells according to their expression of EGFR, and the neural stem cell markers CD15 and CD133. Prazosin inhibits cell viability regardless of CD133 or CD15 expression. *P = 0.0286, n = 4, two‐sided Mann–Whitney U‐test.Immunocytochemical staining of NSCs and GICs cultured in media favoring neuronal (β3‐tubulin), astroglial (GFAP), or oligodendroglial (O4) differentiation (Diff media). β3‐tub: β3‐tubulin. Scale bar: 20 μm.Viability analysis of differentiated NSCs and GICs treated with prazosin for 72 h. Diff: differentiation. *P = 0.0286, n = 4, two‐sided Mann–Whitney U‐test.Data information: Results in (A‐C, E, G) are presented as mean ± SD in biological quadruplicates from three independent experiments. Suzana Assad Kahn et al. EMBO Mol Med. 2016;8:511-526 © as stated in the article, figure or figure legend