Supplementary Figure S1 from Radiation Responses of 2D and 3D Glioblastoma Cells: A Novel, 3D-specific Radioprotective Role of VEGF/Akt Signaling through Functional Activation of NHEJ

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Abstract
Radiosensitisation of G1 and G7 3D GSC by PARP inhibitor olaparib and ATM inhibitor KU55933. A, Determination of secreted VEGF by Elisa assay of media recovered from G7, E2 and R10 3D cells grown at hypoxic (1% O2) and normoxic (20% O2) conditions. Media was collected 48 h after seeding. Data represents means {plus minus} SD from 3 independent experiments performed in duplicate. B, Clonogenic survival efficiency of G1 and G7 GSC grown on 3D conditions after receiving 0 or 3 Gy in a 96-well clonogenic assay. C-E, Erlotinib (C), olaparib (D) and KU55933 (E) dose response (0.1 microM to 10 microM) at 0 and 3 Gy in G1 and G7 3D GSC. Cells were treated with respective inhibitor 2 h prior to ionizing radiation. Values were normalized to vehicle (DMSO) against their respective radiation dose. Curves were fitted with a median enhancement effect model. Statistical analysis with one-way ANOVA, *p<0.05; **p<0.005.