MEK抑制剂
神经母细胞瘤
癌症研究
MAPK/ERK通路
细胞周期蛋白依赖激酶8
激酶
生物
信号转导
细胞生物学
遗传学
细胞培养
Notch信号通路
作者
Clare F. Malone,Minjee Kim,Gabriela Alexe,Kathleen C. Engel,Alexandra B. Forman,Amanda L. Robichaud,Amy Saur Conway,Amy Goodale,Ashleigh Meyer,Delan Khalid,Allen Thayakumar,John M. Hatcher,Nathanael S. Gray,Federica Piccioni,Kimberly Stegmaier
出处
期刊:Cancer Research
[American Association for Cancer Research]
日期:2022-11-17
卷期号:83 (2): 285-300
被引量:2
标识
DOI:10.1158/0008-5472.can-21-4309
摘要
Abstract Aberrant RAS/MAPK signaling is a common driver of oncogenesis that can be therapeutically targeted with clinically approved MEK inhibitors. Disease progression on single-agent MEK inhibitors is common, however, and combination therapies are typically required to achieve significant clinical benefit in advanced cancers. Here we focused on identifying MEK inhibitor-based combination therapies in neuroblastoma with mutations that activate the RAS/MAPK signaling pathway, which are rare at diagnosis but frequent in relapsed neuroblastoma. A genome-scale CRISPR-Cas9 functional genomic screen was deployed to identify genes that when knocked out sensitize RAS-mutant neuroblastoma to MEK inhibition. Loss of either CCNC or CDK8, two members of the mediator kinase module, sensitized neuroblastoma to MEK inhibition. Furthermore, small-molecule kinase inhibitors of CDK8 improved response to MEK inhibitors in vitro and in vivo in RAS-mutant neuroblastoma and other adult solid tumors. Transcriptional profiling revealed that loss of CDK8 or CCNC antagonized the transcriptional signature induced by MEK inhibition. When combined, loss of CDK8 or CCNC prevented the compensatory upregulation of progrowth gene expression induced by MEK inhibition. These findings propose a new therapeutic combination for RAS-mutant neuroblastoma and may have clinical relevance for other RAS-driven malignancies. Significance: Transcriptional adaptation to MEK inhibition is mediated by CDK8 and can be blocked by the addition of CDK8 inhibitors to improve response to MEK inhibitors in RAS-mutant neuroblastoma, a clinically challenging disease.
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