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Activation of the p53 transcriptional program sensitizes cancer cells to Cdk7 inhibitors

ABSTRACT: Cdk7, the CDK-activating kinase and transcription factor IIH component, is a target of inhibitors that kill cancer cells by exploiting tumor-specific transcriptional dependencies. However, whereas selective inhibition of analog-sensitive (AS) Cdk7 in colon cancer derived cells arrests division and disrupts transcription, it does not by itself trigger apoptosis efficiently. Here we show that p53 activation by 5-fluorouracil or nutlin-3 synergizes with a reversible Cdk7as inhibitor to induce cell death. Synthetic lethality was recapitulated with covalent inhibitors of wild-type Cdk7, THZ1 or the more selective YKL-1-116. The effects were allele-specific; a CDK7as mutation conferred both sensitivity to bulky adenine analogs and resistance to covalent inhibitors. Non-transformed colon epithelial cells were resistant to these combinations, as were cancer-derived cells with p53-inactivating mutations. Apoptosis was dependent on death receptor DR5, a p53 transcriptional target whose expression was refractory to Cdk7 inhibition. Therefore, p53 activation induces transcriptional dependency to sensitize cancer cells to Cdk7 inhibition.

ORGANISM(S): Homo sapiens

PROVIDER: GSE99794 | GEO | 2017/10/10

SECONDARY ACCESSION(S): PRJNA389616

REPOSITORIES: GEO

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CDK7 controls E2F- and MYC-driven proliferative and metabolic vulnerabilities in multiple myeloma

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2023-02-01 | GSE172441 | GEO

CDK7 inhibition interdicts deregulated transcription and cell cycle control in multiple myeloma [Sensitive_MM_Cell_Lines_RNA-seq]

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2013-12-23 | E-GEOD-50622 | biostudies-arrayexpress

Targeting transcriptional dependencies in cancer using a covalent CDK7 inhibitor (expression)

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2014-06-22 | E-GEOD-50624 | biostudies-arrayexpress

CDK7-dependent Transcriptional Addiction in Triple-Negative Breast Cancer (Microarray)

Project description:Triple-negative breast cancer (TNBC) is a highly aggressive form of breast cancer that exhibits extremely high levels of genetic complexity and yet a relatively uniform transcriptional program. We postulate that TNBC might be highly dependent on uninterrupted transcription of a key set of genes within this gene expression program and might therefore be exceptionally sensitive to inhibitors of transcription. Utilizing a novel kinase inhibitor and CRISPR/Cas9-mediated gene editing, we show here that triple-negative but not ER/PR+ breast cancer cells are exceptionally dependent on CDK7, a transcriptional cyclin-dependent kinase. TNBC cells are unique in their dependence on this transcriptional CDK and suffer apoptotic cell death upon CDK7 inhibition. An “Achilles cluster” of TNBC-specific genes are extremely sensitive to CDK7 inhibition and frequently associated with super-enhancers. We conclude that CDK7 mediates transcriptional addiction to a vital cluster of genes in TNBC and CDK7 inhibition may be useful therapy for this challenging cancer. Expression microarrays in H3K27ac in triple-negative breast cancer +/- treatment with covalent CDK7 inhibitor THZ1 treatment

2015-09-24 | E-GEOD-69106 | biostudies-arrayexpress

Super-enhancer-associated oncogenes as novel therapeutic targets in osteosarcoma (Microarray gene expression data)

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Selective CDK7 inhibition suppresses cell cycle progression and MYC signaling while enhancing apoptosis in therapy-resistant estrogen receptor positive breast cancer

Project description:Purpose: Resistance to endocrine therapy (ET) and CDK4/6 inhibitors (CDK4/6i) is a clinical challenge in estrogen receptor (ER) positive (ER+) breast cancer (BC). Cyclin-dependent kinase 7 (CDK7) is a candidate target in endocrine resistant ER+ BC models and selective CDK7 inhibitors (CDK7i) are in clinical development for the treatment of ER+ BC. Nonetheless, the precise mechanisms responsible for the activity of CDK7i in ER+ BC remain elusive. Herein, we sought to unravel these mechanisms. Experimental Design: We conducted multi-omic analyses in ER+ BC models in vitro and in vivo including models with different genetic backgrounds. We also performed genome wide CRISPR knock-out library screens to identify potential therapeutic vulnerabilities in CDK4/6i resistance models. Results: We found that the on-target anti-tumor effects of CDK7 inhibition in ER+ BC are in part p53 dependent, involve cell-cycle inhibition and suppression of c-Myc. Moreover, CDK7 inhibition exhibited cytotoxic effects, distinctive from the cytostatic nature of ETs and CDK4/6i. CDK7 inhibition resulted in suppression of ER phosphorylation at S118, however, long-term CDK7 inhibition resulted in increased ER signaling, supporting the combination of ET with a CDK7i. Lastly, genome wide CRISPR/Cas9 screens identified CDK7 and MYC signaling as putative vulnerabilities in CDK4/6i resistance, and CDK7 inhibition effectively inhibited CDK4/6i resistant models. Conclusions: Taken together, these findings support the clinical investigation of selective CDK7 inhibition combined with ET to overcome treatment resistance in ER+ BC. In addition, our study highlights the potential of increased c-Myc activity and intact p53 as predictors for sensitivity to CDK7 inhibitor-based treatments.

2024-02-12 | GSE230362 | GEO

Transcriptional CDK inhibitors as potential treatment option for testicular germ cell tumors

Project description:Type II testicular germ cell tumors (TGCT) are the most frequently diagnosed solid malignancy in young men. Up to 15 % of patients with metastatic non-seminomas show cisplatin resistance having a very poor survival rate due to lacking treatment options. Transcriptional cyclin-dependent kinases (CDK) have been shown to be effective targets in treatment of different types of cancer. Here, we investigated the effects of the CDK inhibitors dinaciclib, flavopiridol, YKL-5-124, THZ1, NVP2, SY0351 and THZ531. XTT viability assay revealed strong cytotoxic impact of CDK7/ 12/ 13 inhibitor SY0351 and CDK9 inhibitor NVP2 on the TGCT wild type cell lines (2102EP, NCCIT, TCam2) and the cisplatin resistant cell lines (2102EP-R, NCCIT-R). The CDK7 inhibitor YKL-5-124 showed strong impact on 2102EP, 2102EP-R, NCCIT and NCCIT-R cell lines leaving the MPAF control cell line mostly unaffected. FACS based analysis revealed mild effects on the cell cycle of 2102EP and TCam2 cells after SY0351, YKL-5-124 or NVP2 treatment. Molecular analysis showed a cell line specific response for SY0351 and NVP2 inhibition while YKL-5-124 induced similar molecular changes in 2102EP, TCam2 and MPAF cells. Thus, after TGCT subtype determination CDK inhibitors might be a potential alternative for optimized and individualized therapy independent of chemotherapy sensitivity.

2022-03-26 | GSE198248 | GEO

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