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SMO variants explain the majority of drug resistance in basal cell carcinoma [Target Sequencing]

ABSTRACT: Advanced basal cell carcinomas (BCCs) frequently acquire resistance to Smoothened (SMO) inhibitors through unknown mechanisms, providing a unique opportunity to study human tumor evolution. Here, we identify SMO mutations in 50% (22/44) of resistant BCCs compared with 5.6% (2/36) of untreated BCCs (p<0.0001), and show that these mutations maintain Hedgehog signaling in the presence of SMO inhibitors. Alterations include four ligand binding pocket (LBP) mutations that define sites of inhibitor binding and four variants that confer constitutive activity and inhibitor resistance, thus defining pivotal residues of SMO that ensure receptor autoinhibition. Finally, we show that both classes of SMO variants respond to the aPKC-ι/λ inhibitor PSI and GLI2 antagonist ATO that operate downstream of SMO

ORGANISM(S): Homo sapiens

PROVIDER: GSE58376 | GEO | 2015/03/16

SECONDARY ACCESSION(S): PRJNA252375

REPOSITORIES: GEO

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SMO variants explain the majority of drug resistance in basal cell carcinoma [RNA-Seq]

Project description:Advanced basal cell carcinomas (BCCs) frequently acquire resistance to Smoothened (SMO) inhibitors through unknown mechanisms, providing a unique opportunity to study human tumor evolution. Here, we identify SMO mutations in 50% (22/44) of resistant BCCs compared with 5.6% (2/36) of untreated BCCs (p<0.0001), and show that these mutations maintain Hedgehog signaling in the presence of SMO inhibitors. Alterations include four ligand binding pocket (LBP) mutations that define sites of inhibitor binding and four variants that confer constitutive activity and inhibitor resistance, thus defining pivotal residues of SMO that ensure receptor autoinhibition. Finally, we show that both classes of SMO variants respond to the aPKC-ι/λ inhibitor PSI and GLI2 antagonist ATO that operate downstream of SMO

2015-03-16 | GSE58375 | GEO

SMO variants explain the majority of drug resistance in basal cell carcinoma [exome-seq]

2015-03-16 | GSE58374 | GEO

GBM response to Smo and PI3K inhibitors

2013-09-01 | GSE49416 | GEO

GBM response to Smo and PI3K inhibitors

Project description:Combination therapy with Smo and PI3K inhibitors results in a synergistic effect in reducing tumor growth in PTEN-deficient Glioblastoma. To identify consequences of combination therapy with an Smo inhibitor and a PI3K inhibitor on a genome-wide scale, we performed Affymetrix microarrays with two different PTEN-deficient GBMs treated with single drugs or combination therapy. A small set of genes was significantly affected by combination therapy in hBT70 and/or hBT112, including several genes implicated in GBM prognosis, or identified as targets of Shh, PI3K or S6 pathways 29-33 . There are two different human GBM tumors (BT70 and BT112). Both are PTEN deficient. Samples were treated with DMSO (Control), LDE225 at 1 uM for 5 days, BKM 120 100 nM for 5 days, or LDE225 1 uM and BKM 120 100 nM for 5 days (Combo). Two biological replicates of each condition were analyzed.

2013-09-01 | E-GEOD-49416 | biostudies-arrayexpress

RNA sequencing of Foxd1Cre;Smo(flox/-) mutant kidneys

Project description:Purpose: To analyze the mRNA content of Foxd1Cre;Smo(flox/-) mutant kidneys. Methods: We collected E13.5 wildtype and Foxd1Cre;Smo(flox/-) mutant kidneys and isolated RNA to do RNA-Seq. Results: Identified differentially expressed transcripts in Foxd1Cre;Smo(flox/-) mutant kidneys compared to wildtype controls. Conclusions: Our work provides novel insight into how Hedgehog signaling from stromal cells influences renal development.

2018-06-26 | GSE103923 | GEO

aPKC controls endothelial growth by modulating c-Myc via FoxO1 DNA binding ability

Project description:Strict regulation of proliferation is vital for development, whereas unregulated cell proliferation is a fundamental characteristic of cancer. The polarity protein atypical protein kinase C lambda/iota (aPKC lambda) is associated with cell proliferation through unknown mechanisms. In endothelial cells, suppression of aPKC lambda impairs proliferation despite hyperactivated mitogenic signaling. Here we show that aPKC lambda phosphorylates the DNA binding domain of forkhead box O1 (FoxO1) transcription factor, a gatekeeper of endothelial growth. Although mitogenic signaling excludes FoxO1 from the nucleus, consequently increasing c-Myc abundance and proliferation, aPKC lambda controls c-Myc expression via FoxO1/miR-34c signaling without affecting its localization. We find this pathway is strongly activated in the malignant vascular sarcoma, angiosarcoma, and aPKC inhibition reduces c-Myc expression and proliferation of angiosarcoma cells. Moreover, FoxO1 phosphorylation at Ser218 and aPKC expression correlates with poor patient prognosis. Our findings may provide a new therapeutic strategy for treatment of malignant cancers, like angiosarcoma.

2019-11-12 | PXD011595 | Pride

Smo and Ets-2 signaling in fibroblasts effects gene expression

Project description:These experiments aim determine the effects of Smo and Ets-2 signaling on fibroblast gene expression.

2016-11-22 | GSE61707 | GEO

Gene expression profiling of Dermal Papilla (DP) cells isolated from wild type (WT) and DP-specific Smo gain-of-function (Smo*) mutant mice during both telogen (at P20) and anagen (at P28).

Project description:Gene expression analysis revealed that the DP transcriptome is altered in the Smo* mutant. At P28 the expression of 2226 genes was significantly altered. The expression of 473 genes was altered in the Smo* mutant during telogen (P20).

2019-06-12 | GSE115649 | GEO

Genomic analysis of non-NF2 meningiomas reveals mutations in TRAF7, KLF4, AKT1, and SMO.

Project description:We report genomic analysis of 300 meningiomas, the most common primary brain tumors, leading to the discovery of mutations in TRAF7, a proapoptotic E3 ubiquitin ligase, in nearly one-fourth of all meningiomas. Mutations in TRAF7 commonly occurred with a recurrent mutation (K409Q) in KLF4, a transcription factor known for its role in inducing pluripotency, or with AKT1(E17K), a mutation known to activate the PI3K pathway. SMO mutations, which activate Hedgehog signaling, were identified in ~5% of non-NF2 mutant meningiomas. These non-NF2 meningiomas were clinically distinctive-nearly always benign, with chromosomal stability, and originating from the medial skull base. In contrast, meningiomas with mutant NF2 and/or chromosome 22 loss were more likely to be atypical, showing genomic instability, and localizing to the cerebral and cerebellar hemispheres. Collectively, these findings identify distinct meningioma subtypes, suggesting avenues for targeted therapeutics. Analysis of meningioma gene expression data for each mutation subtype. Includes gene expression data from 75 unique meningiomas and 39 replicates.

2014-05-29 | E-GEOD-58037 | biostudies-arrayexpress

Genomic analysis of non-NF2 meningiomas reveals mutations in TRAF7, KLF4, AKT1, and SMO.

2014-05-29 | GSE58037 | GEO

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