Acute, systemic Atg7 deficiency compromises tumorigenesis.

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Acute, systemic Atg7 deficiency compromises tumorigenesis. Acute, systemic Atg7 deficiency compromises tumorigenesis. A, experimental design to induce lung tumors before conditional whole-body Atg7 deletion. Ubc-CreERT2/+;KrasG12D-frt/+;Trp53frt/frt;Atg7+/+ and Ubc-CreERT2/+;KrasG12D-frt/+;Trp53frt/frt;Atg7flox/flox mice were infected with Ad-FLPo at 6 to 8 weeks of age to activate RAS and delete Trp53, then these mice were treated with TAM at 12 weeks after Ad-FLPo by intraperitoneal injection to create Atg7Δ/Δ mice. Tumor progression was analyzed at various times thereafter. B, representative micro-CT three-dimensional reconstruction and quantification of lung volume showing healthy air space before TAM treatment and equivalent tumor burden at the time of TAM treatment of mice with the indicated genotypes. Kras+/+;Trp53+/+;Atg7+/+ mice were used as a control for normal lung airspace. Tumor histology and normal adjacent lung tissue (H&E images) were analyzed at 5 weeks after TAM (last three plots). Arrows point to dead cells. C, quantification of wet lung weight (top) and tumor burden (bottom). Error bar, SEM; P values are calculated using two-way ANOVA with the Bonferroni posttest. D, representative Western blotting for ATG7, p62, S6, P-S6, and LC3 of Atg7+/+ or AtgΔ/Δ tumor tissues. β-Actin serves as a protein loading control. E, representative IHC for ATG7, p62, TOM20, and EM images of tumor tissue. Arrows in second plot point to p62 aggregates, and arrows in the third plot point to TOM20 accumulation in tumors from Atg7-deficient mice. N, nucleus; M, mitochondria; Ly, lysosome; AP, autophagosome; L, lipid. F, representative IHC images for active caspase-3 (left) with quantification (right). Error bar, SEM; P values are calculated using two-way ANOVA with the Bonferroni posttest. G, representative IHC images for Ki67 (left) with quantification (right). Error bar, SEM; P values are calculated using two-way ANOVA with the Bonferroni posttest. H, representative IHC images for S6, P-S6, 4E-BP1, P-4E-BP1, ERK, and P-ERK. I, a model for the destructive effect of autophagy on established tumors. Gizem Karsli-Uzunbas et al. Cancer Discovery 2014;4:914-927 ©2014 by American Association for Cancer Research