Journal: Neuro-Oncology
Article Title: Betacellulin drives therapy resistance in glioblastoma
doi: 10.1093/neuonc/noz206
Figure Lengend Snippet: Inhibition of STAT3 increases production of NF-κB-dependent cytokines. (A) LN229:EGFR, U87:EGFR, and GBM8 cells were treated with DMSO or 3 μM Stattic for 24 h. Supernatant were prepared and used to assess 23 human cytokines with a human cytokine antibody array kit. GM-CSF, IL-6, IL-8, and control are boxed and labeled. Intensity of GM-CSF, IL6, and IL8 from LN229:EGFR cells was quantified by densitometry using a Silver Fast Scanner and ImageJ software. Data shown represent mean ± SD of quadruplicate measurements from two independent experiments. Fold changes were normalized to DMSO-treated control. ***P < 0.001, vehicle versus Stattic (GM-CSF); **P = 0.0011, vehicle versus Stattic (IL-6); no significant, vehicle versus Stattic (IL-8) by two-tailed Student’s t-test. (B) LN229:EGFR, U87:EGFR, and GBM8 cells were treated with 3 μM Stattic for 24 h, harvested, lysed, and analyzed by western blotting with indicated antibodies. For the expression levels of EGFR or GAPDH in each cell line, see Fig. 2A. (C) LN229:EGFR, U87:EGFR, and GBM8 cells were transfected with control siRNA or STAT3 siRNA for 48 h, harvested, lysed, and analyzed by western blot with indicated antibodies. For the expression levels of EGFR or GAPDH in each cell line, see Fig. 2B. (D) LN229:EGFR cells were treated with DMSO, 3 μM Stattic, 3 μM Bay11-7085, or Stattic plus Bay11-7085 for 24 h. These profiles obtained by incubating the array membranes with supernatant are shown. GM-CSF, IL-6, IL-8, and control are boxed and labeled. Intensity of GM-CSF, IL6, and IL8 was quantified by densitometry using a Silver Fast Scanner and ImageJ software. Data shown represent mean ± SD of quadruplicate measurements from 2 independent experiments. Fold changes were normalized to DMSO-treated control. For intensity of GM-CSF, ***P = 0.0003, vehicle versus Bay11-7085; ***P = 0.0002, vehicle versus Stattic; no significant, vehicle versus Bay-11-7085 plus Stattic. For intensity of IL6, *P = 0.0238, vehicle versus Bay11-7085; **P = 0.0012, vehicle versus Stattic; no significant, vehicle versus Bay-11-7085 plus Stattic. For intensity of IL8, **P = 0.0038, vehicle versus Bay11-7085; no significant, vehicle versus Stattic; **P = 0.0018, vehicle vs Bay-11-7085 plus Stattic by two-tailed Student’s t-test. (E) LN229:EGFR cells treated with 3 μM Stattic, 3 μM Bay11-7085, or 3 μM Stattic plus 3 μM Bay11-7085 for 24 h, harvested, lysed, and analyzed by western blot with indicated antibodies. (F) LN229:EGFR cells were treated with IL-6 (10 ng/mL), GM-CSF (1 ng/mL), or IL-8 (100 ng/mL) for indicated time (0.5–3 h), harvested, lysed, and analyzed by western blot with antibodies indicated. See also Supplementary Fig. 1.
Article Snippet: EGFR Ligand Antibody Array To study the secretion/expression of EGFR ligands, we used a customized human cytokine antibody array kit (RayBiotech).
Techniques: Inhibition, Ab Array, Labeling, Software, Two Tailed Test, Western Blot, Expressing, Transfection