CDK7 Inhibition by THZ1 Suppresses Cancer Stemness in both Chemonaïve and Chemoresistant Urothelial Carcinoma via the Hedgehog Signaling Pathway
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE164370 | GEO | 2021/03/21
REPOSITORIES: GEO
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Project description:CDK7 Inhibition by THZ1 Suppresses Cancer Stemness in both Chemonaïve and Chemoresistant Urothelial Carcinoma via the Hedgehog Signaling Pathway
| PRJNA690137 | ENA
Project description:Peripheral T-cell lymphomas (PTCL) are aggressive diseases with poor response to chemotherapy and dismal survival. Identification of effective strategies to target PTCL biology represents an urgent need. Here we report that PTCL are sensitive to transcription-targeting drugs, and, in particular, to THZ1, a covalent inhibitor of cyclin-dependent kinase 7 (CDK7). The STAT-signaling pathway is highly vulnerable to THZ1 even in PTCL cells that carry the activating STAT3 mutation Y640F. In mutant cells, CDK7 inhibition decreases STAT3 chromatin binding and expression of highly transcribed target genes like MYC, PIM1, MCL1, CD30, IL2RA, CDC25A and IL4R. In surviving cells, THZ1 decreases the expression of STAT-regulated anti-apoptotic BH3 family members MCL1 and BCL-XL sensitizing PTCL cells to BH3 mimetic drugs. Accordingly, the combination of THZ1 and the BH3 mimetic obatoclax improves lymphoma growth control in a primary PTCL ex vivo culture and in two STAT3-mutant PTCL xenografts, delineating a potential targeted agent-based therapeutic option for these patients.
2016-12-15 | GSE79955 | GEO
Project description:Purpose: To assess THZ1-induced global changes of transcriptome of Hh-driven cancer Methods: SMB56 or SMB56-shSufu cells were mouse hedgehog-driven medulloblastoma cell lines that are either responsive or resistant to SMO inhibitor (GDC-0449). They were treated with 0.1 uM THZ1 or DMSO for 8 hours. 1 uM GDC-0449 treated SMB56 cells were included as control. Gene expression profiles were generated by RNAseq, in duplicate, using Hiseq3000. The RNAseq reads were mapped to the hg19 reference genome using STAR (v2.5.3a). Expression levels for each sample were quantified to FPKM using Cufflinks (v2.2.1). Differential expression analysis was carried out using R package DESeq2 (v1.20.0) Results: Compared to GDC-0449 treatment in SMB56 cells, THZ1 induced a robust global transcriptional downregulation in both SMB56 and SMB56-shSufu cells. When we compared the top 2000 significantly downregulated genes between THZ1-treated SMB56 and SMB56-shSufu cells, we found they had ~70% in common. GSEA reveals Hh-target genes are enriched in DMSO treated cells versus THZ1-treated ones. Conclusions: CDK7 inhibition induced a robust and similar transcriptional downregulation in both SMB56 and SMB56-shSufu cells, with preferential targeting of Hh pathway transcriptional output.
2019-05-01 | GSE130485 | GEO
Project description:BackgroundGastrointestinal stromal tumours (GISTs) are the most common mesenchymal tumours of the gastrointestinal tract and are characterized by activating mutations of c-KIT or PDGFRa receptor tyrosine kinases (RTKs). Despite the clinical success of tyrosine kinase inhibitors (TKIs), more than half of GIST patients develop resistance due to a second mutation. Cyclin-dependent kinase 7 (CDK7) is the catalytic subunit of CDK-activating kinase (CAK), and it plays an important role in the regulation of cell cycle transitions and gene transcription. THZ1, a CDK7 inhibitor, exhibits a dose-dependent inhibitory effect in various cancers.MethodsData from the public GEO database and tissue microarray were used to analyse the gene expression levels of CDKs in GISTs. The impact of CDK7 knockdown and the CDK7 inhibitor THZ1 on GIST progression was investigated in vitro using CCK-8, colony formation, and flow cytometry assays and in vivo using a xenograft mouse model. RNA sequencing was performed to investigate the mechanism of GIST cell viability impairment mediated by THZ1 treatment.ResultsOur study demonstrated that CDK7 is relatively overexpressed in high-risk GISTs and predicts a poor outcome. A low concentration of THZ1 exhibited a pronounced antineoplastic effect in GIST cells in vivo and in vitro. Moreover, THZ1 exerted synergistic anticancer effects with imatinib. THZ1 treatment resulted in transcriptional modulation by inhibiting the phosphorylation of Ser2, Ser5, and Ser7 within RNA polymerase II (RNAPII). c-KIT, an oncogene driver of GIST, was transcriptionally repressed by THZ1 treatment or CDK7 knockdown. Transcriptome sequencing analysis showed that OSR1 acts as a downstream target of CDK7 and regulates c-KIT expression. Taken together, our results highlight elevated CDK7 expression as a predictor of poor outcome in GIST and present the combination of CDK7 and RTK inhibitors as a potent therapeutic strategy to improve the efficacy of GIST treatment. Video abstract.
| S-EPMC9454178 | biostudies-literature
Project description:The t(8;21) is one of the most frequent chromosomal translocations associated with acute myeloid leukemia (AML). We found that t(8;21) AML were extremely sensitive to THZ1, which triggered apoptosis after only 4 hr. We used precision nuclear run-on transcription sequencing (PROseq) to define the global effects of THZ1 and other CDK inhibitors on RNA polymerase II dynamics. Inhibition of CDK7 using THZ1 caused wide-spread loss of promoter-proximal paused RNA polymerase. This loss of 5’ pausing was associated with accumulation of polymerases in the body of a large number of genes. However, there were modest effects on genes regulated by “super-enhancers”. At the 3’ ends of genes, treatment with THZ1 suppressed RNA polymerase “read through” at the end of the last exon, which resembled a phenotype associated with a mutant RNA polymerase with slower elongation rates. Consistent with this hypothesis, polyA site-sequencing (PolyA-seq) did not detect differences in polyA sites after THZ1 treatment. PROseq analysis after short treatments with THZ1 suggested that these 3’ effects were due to altered CDK7 activity at the 5’ end of long genes, and were likely to be due to slower rates of elongation.
2019-02-11 | GSE102243 | GEO
Project description:Purpose:CDK7 is a potential drug target for the treatment of tumors. THZ1 is the first selective and covalent CDK7 inhibitor, which shows anti-tumor effects in various cancers by inhibiting cell proliferation and inducing apoptosis. However, whether THZ1 has an inhibitory effect on B-ALL cells and the underlying mechanism remains unclear. To address this question, we collected THZ1- and DMSO-treated cells for RNA sequencing Methods:Nalm6 cells were seeded at a density of 1× 10e6 cells/ml and treated with 500nm THZ1or DMSO for 24h. Results:THZ1 perturbed the cellular metabolic pathways of B-ALL cells in vitro.
2021-02-20 | GSE167099 | GEO
Project description:Chemotherapy with gemcitabine plus cisplatin remains the mainstay of treatment for metastatic urothelial carcinoma (UC); however, drug resistance occurs in most patients and eventually leads to treatment failure. In this study, we investigated the role of cyclin-dependent kinase 7 (CDK7) regulation in the treatment of human UCs. Moreover, we studied the effect of THZ1, a CDK7 inhibitor, alone and in combination with gemcitabine, on UCs and explored the underlying mechanism. Immunohistochemical staining showed that CDK7 expression was significantly higher in UC tumors than in counterpart urothelium. THZ1 elicited dose-dependent cytotoxicity and apoptosis in two high-grade UC cells (BFTC905 and T24). THZ1 co-treatment potentiated gemcitabine-induced cytotoxicity with suppression of B-cell lymphoma 2 (Bcl-2). Studies with a xenograft nude mouse model also confirmed that THZ1 enhanced the antitumor effect of gemcitabine on UC. These findings provide important pilot data to target CDK7 or Bcl-2 for the treatment of UCs and for overcoming chemoresistance in UCs.
| S-EPMC7840706 | biostudies-literature
Project description:Peripheral T-cell lymphomas (PTCL) are aggressive diseases with poor response to chemotherapy and dismal survival. Identification of effective strategies to target PTCL biology represents an urgent need. Here we report that PTCL are sensitive to transcription-targeting drugs, and, in particular, to THZ1, a covalent inhibitor of cyclin-dependent kinase 7 (CDK7). The STAT-signalling pathway is highly vulnerable to THZ1 even in PTCL cells that carry the activating STAT3 mutation Y640F. In mutant cells, CDK7 inhibition decreases STAT3 chromatin binding and expression of highly transcribed target genes like MYC, PIM1, MCL1, CD30, IL2RA, CDC25A and IL4R. In surviving cells, THZ1 decreases the expression of STAT-regulated anti-apoptotic BH3 family members MCL1 and BCL-XL sensitizing PTCL cells to BH3 mimetic drugs. Accordingly, the combination of THZ1 and the BH3 mimetic obatoclax improves lymphoma growth control in a primary PTCL ex vivo culture and in two STAT3-mutant PTCL xenografts, delineating a potential targeted agent-based therapeutic option for these patients.
| S-EPMC5290269 | biostudies-literature
Project description:RNA-seq analysis evaluating effects of Cdk7 inhibitor THZ1 on responses of mouse hearts to TAC
2022-04-25 | GSE151254 | GEO
Project description:We performed RNA-seq and ChIP-seq in three prostate cell lines (VCaP, LNCaP and DU145) to ascertain the role of the mediator complex MED1 in AR signaling. Upon androgen stimulation, MED1 undergoes phosphorylation by CDK7 and physically engages with AR at super-enhancer sites, which is essential for AR-mediated transcription. The CDK7 specific inhibitor THZ1 blunts AR-dependent neoplastic growth by preventing the co-recruitment of AR/MED1 in a genome-wide fashion, and reverts the enzalutamide resistance characterized by hyper-phosphorylated MED1. The effect of THZ1 phenocopies that for MED1 and CDK7 knockdown.
2019-08-20 | GSE125245 | GEO