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Gene expression profile in melanomas from Pdk1-inactivated BrafV600E::Pten-/- mice

ABSTRACT: Gene expression profiling was performed to access the changes in gene expression in melanomas from Pdk1-inactivated Brafv600E::Pten-/- mice. The expression profiles of the BrafV600E::Pten-/-::Pdk1-/- were compared to the BrafV600E::Pten-/-::Pdk+/+ genotypes. The analysis has identified several important signaling pathways in Pdk1-dependent melanomagenesis. Melanoma tumors from the BrafV600E::Pten-/-::Pdk1+/+ and BrafV600E::Pten-/-::Pdk1-/- genotypes were harvested and mRNA from each group was pooled to enable four biologically replicates analysis.

ORGANISM(S): Mus musculus

SUBMITTER: Jian-Liang Li

PROVIDER: E-GEOD-42187 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Genetic inactivation or pharmacological inhibition of Pdk1 delays development and inhibits metastasis of Braf(V600E)::Pten(-/-) melanoma.

Scortegagna M M Ruller C C Feng Y Y Lazova R R Kluger H H Li J-L JL De S K SK Rickert R R Pellecchia M M Bosenberg M M Ronai Z A ZA

Oncogene 20130916 34

Phosphoinositide-dependent kinase-1 (PDK1) is a serine/threonine protein kinase that phosphorylates members of the conserved AGC kinase superfamily, including AKT and protein kinase C (PKC), and is implicated in important cellular processes including survival, metabolism and tumorigenesis. In large cohorts of nevi and melanoma samples, PDK1 expression was significantly higher in primary melanoma, compared with nevi, and was further increased in metastatic melanoma. PDK1 expression suffices for i ...[more]

PMID: 24037523

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Gene expression profile in melanomas from Pdk1-inactivated BrafV600E::Pten-/- mice

Project description:Gene expression profiling was performed to access the changes in gene expression in melanomas from Pdk1-inactivated Brafv600E::Pten-/- mice. The expression profiles of the BrafV600E::Pten-/-::Pdk1-/- were compared to the BrafV600E::Pten-/-::Pdk+/+ genotypes. The analysis has identified several important signaling pathways in Pdk1-dependent melanomagenesis.

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mTORC1 activation blocks BrafV600E-induced growth-arrest but is insufficient for melanoma formation

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Beta-catenin Controls Metastasis in Braf-activated Pten-inactivated Melanomas

Project description:Malignant melanoma is characterized by frequent metastasis, however specific changes that regulate this process have not been clearly delineated. Although it is well known that Wnt signaling is frequently dysregulated in melanoma, the functional implications of this observation are unclear. By modulating beta-catenin levels in a mouse model of melanoma that is based on melanocyte-specific Pten loss and BrafV600E mutation, we demonstrate that beta-catenin is a central mediator of melanoma metastasis to lymph node and lung. In addition to altering metastasis, beta-catenin levels control tumor differentiation and regulate both MAPK/Erk and PI3K/Akt signaling. Highly metastatic tumors with beta-catenin stabilization are very similar to a subset of human melanomas; together these findings establish Wnt signaling as a metastasis regulator in melanoma. MoGene-1_0-st-v1: Four samples total. Two biological replicates of uncultured Pten/Braf murine melanomas and two biological replicates of uncultured Pten/Braf/Bcat-STA murine melanomas. MoEx-1_0-st-v1: Two samples total. Dissociated tumor and FACS-enriched Pten/Braf and Pten/Braf/Bcat-STA murine melanoma.

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Project description:To elucidate the mechanism by which CXCR2 perturbation in melanocytes could alter initiation and growth of BrafV600E/Pten-/- melanoma, we examined the transcriptome of tumors arising in BrafV600E/Pten-/-/Cxcr2WT (n=7) and BRAFV600E/PTEN-/-/CXCR2-/- (n=8) mice.

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Hydrogen Deuterium Exchange of PDK1

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Expression data from MMTV-PDK1 transgenic mice

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Pigment producing melanocytes as the cells of origin of BRAFV600E-induced mouse cutaneous melanoma

Project description:To investigate whether cutaneous melanoma originates from a resident adult melanocyte stem cell (MSC) or a mature melanocyte, we created a model that recapitulates key histopathological features of human melanomagenesis by inducing a BRafV600E-driven melanomagenic program in interfollicular (IF) melanocytes located in mouse tails. To this end, we sequenced the transcriptome of FACS-sorted individual IFE reporter-positive cells from BRaf/Pten/tdTomato mice, the tails of which had been painted with 4-HT for 31 and 72 days, respectively. These time points were chosen as melanoma cells are exclusively found in the IF epidermis at day 31 (d31) and in both epidermis and dermis at day 72 (d72). Normal IF melanocytes from Tyr::CreERT2/+; ROSA26RLSL-tdTomato/+ were also isolated and profiled These data indicated that loss of differentiation markers occurs in a subset of targeted epidermal melanoma cells before the onset of dermal invasion and that this event may, at least partly, be a consequence of induction of Zeb1 expression.

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