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Ablation of Cdh1 and Trp53 in the uterus reveals novel mechanisms controlling tumor microenvironment in endometrial cancer.

ABSTRACT: Because TP53 mutation and CDH1 inactivation are the most common abnormalities found in human type II endometrial carcinomas, the contribution of dysfunctional TRP53 and CDH1 in the tumor microenvironment to induce type II endometrial cancer was characterized using mouse as a model. The results of our analysis revealed that conditional deletion of Cdh1 and Trp53 in the uterus regulated most of the genes categorized by their involvement in inflammatory responses, immune cell trafficking, cellular movement, cell-to-cell signaling and interaction and cellular growth and proliferation. A direct comparison of mouse uteri (n=3) from control, single ablation of Cdh1 or Trp53, and ablation of both Cdh1 and Trp53 at 2 months of age.

ORGANISM(S): Mus musculus

SUBMITTER: Kanako Hayashi

PROVIDER: E-GEOD-48131 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Ablation of Cdh1 and Trp53 in the uterus reveals novel mechanisms controlling tumor microenvironment in endometrial cancer.

Project description:Because TP53 mutation and CDH1 inactivation are the most common abnormalities found in human type II endometrial carcinomas, the contribution of dysfunctional TRP53 and CDH1 in the tumor microenvironment to induce type II endometrial cancer was characterized using mouse as a model. The results of our analysis revealed that conditional deletion of Cdh1 and Trp53 in the uterus regulated most of the genes categorized by their involvement in inflammatory responses, immune cell trafficking, cellular movement, cell-to-cell signaling and interaction and cellular growth and proliferation.

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Project description:We analyzed miRNA-based shRNA off-target effects by transducing Trp53-/- MEFs at single- and high-copy with six well-characterized, potent and weak Trp53 shRNAs. To advance RNAi therapy for KRAS-mutant cancer, we developed a functionally validated library of siRNAs against RAS pathway genes that minimize off-target effects and enable combination gene silencing at low dose. We developed an in vivo model for real-time tracking of nanoparticle-based siRNA delivery and offer proof-of-principle that siRNA-mediated inhibition of a single gene (KRAS) or combinations of genes (A/B/C-RAF or KRAS+PIK3C-A/B) can impair the growth of KRAS-mutant colorectal cancer xenografts. Trp53-/- MEFs were transduced with LMP expressing Trp53 shRNAs at single copy (11-21% infection efficiency) and high copy (>98% infection efficiency), selected on puromycin and grown in absence of the selection agent before harvest. Uninfected Trp53-/- MEFs and Trp53-/- MEFs infected with an empty vector control served as M-bM-^@M-^\no shRNAM-bM-^@M-^] reference.

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