Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression profiles of Notch signaling suppression in prostate basal cells.

ABSTRACT: The role of Notch signaling in the maintenance and differentiation of adult prostate stem cells remains unclear. We found that Notch ligands are mainly expressed within the basal cell lineage, while active Notch signaling is detected in both the prostate basal and luminal cell lineages. Disrupting the canonical Notch effector RBP-J impairs the differentiation of prostate basal stem cells and increases their proliferation in vitro and in vivo, but does not affect luminal cell biology. Conversely, ectopic Notch activation in adult prostates results in basal cell depletion and luminal cell hyper-proliferation. TGFÎ² dominates over Notch and overrides Notch ablation-induced proliferation of prostate basal cells. In turn, Notch confers positive feedback by up-regulating a plethora of TGFÎ² signaling components including TGFÎ²RI. These findings reveal crucial roles of the self-enforced positive reciprocal regulatory loop between TGFÎ² and Notch in maintaining prostate basal stem cell dormancy. We employed an in vitro prostate sphere assay to further investigate how Notch signaling regulates basal cell proliferation and differentiation. FACS isolated adult murine prostate basal cells (using FVB mice) were cultured in the prostate sphere assay with or without N-[(3,5-Difluorophenyl)acetyl]-L-alanyl-2-phenyl]glycine-1,1-dimethylethyl ester (DAPT), an inhibitor for the Î³-Secretase complex. Gene expression profiles were taken of vehicle- and DAPT-treated prostate spheres.

ORGANISM(S): Mus musculus

SUBMITTER: Chad Creighton

PROVIDER: E-GEOD-34067 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Notch and TGFβ form a reciprocal positive regulatory loop that suppresses murine prostate basal stem/progenitor cell activity.

Valdez Joseph M JM Zhang Li L Su Qingtai Q Dakhova Olga O Zhang Yiqun Y Shahi Payam P Spencer David M DM Creighton Chad J CJ Ittmann Michael M MM Xin Li L

Cell stem cell 20121101 5

The role of Notch signaling in the maintenance of adult murine prostate epithelial homeostasis remains unclear. We found that Notch ligands are mainly expressed within the basal cell lineage, while active Notch signaling is detected in both the prostate basal and luminal cell lineages. Disrupting the canonical Notch effector Rbp-j impairs the differentiation of prostate basal stem cells and increases their proliferation in vitro and in vivo, but does not affect luminal cell biology. Conversely, ...[more]

PMID: 23122291

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Project description:Notch signaling is frequently hyperactivated in breast cancer, but how the enhanced signaling contributes to the tumor process is less well understood. In this report, we identify the proinflammatory cytokine interleukin-6 (IL-6) as a novel Notch target in breast tumor cells. Enhanced Notch signaling upregulated IL-6 expression at the transcriptional level, leading to activation of autocrine and paracrine JAK/STAT signaling. IL-6 upregulation was mediated by non-canonical Notch signaling, as it could be effectuated by a cytoplasmically localized Notch intracellular domain and was independent on the DNA-binding protein CSL. Instead, Notch-mediated IL-6 upregulation was controlled by two other factors: IKKÎ², a protein in the NF-kB signaling cascade, and p53. Activation of IL-6 by Notch required IKKÎ² function, but interestingly, did not engage canonical NF-ÎºB signaling, in contrast to IL-6 activation by inflammatory agents such as tumor necrosis factor, which requires canonical NF-ÎºB signaling. With regard to p53 status, IL-6 expression was upregulated by Notch when p53 was mutated or lost, but restoring wildtype 53 into p53-mutated or -deficient cells abrogated the IL-6 upregulation. Furthermore, Notch-induced genome-wide transcriptomes from p53 wildtype and -mutated breast tumor cell lines differed extensively, and in a subset of genes upregulated by Notch in a p53-mutant cell line, upregulation was reduced by wildtype p53. In conclusion, we identify IL-6 as a novel non-canonical Notch target gene, and reveal roles for p53 and IKKÎ² in non-canonical Notch signaling in breast cancer and in the generation of cell context-dependent diversity in the Notch signaling output. 30 microarray samples consisting of MCF7 (ER+, wild-type p53, luminal type B breast cancer) and MDA-MB-231 (ER-, mutated p53, basal breast cancer) cells cultured on immobilized 1 Î¼g/ml JAGGED1-Fc or 1 Î¼g/ml DLL4-Fc or 1 Î¼g/ml Fc control with or without 5 Î¼M DAPT for 6 hours in 3 biological replicates.

Dataset Information

Gene expression profiles of Notch signaling suppression in prostate basal cells.

Publications

Notch and TGFβ form a reciprocal positive regulatory loop that suppresses murine prostate basal stem/progenitor cell activity.

Similar Datasets

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