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在肺鳞状细胞癌和恶性胸膜间皮瘤中具有致癌特性的EPHA2突变

EPHA2 mutations with oncogenic characteristics in squamous cell lung cancer and malignant pleural mesothelioma.

作者信息

Tan Yi-Hung Carol, Srivastava Saumya, Won Brian M, Kanteti Rajani, Arif Qudsia, Husain Aliya N, Li Hubert, Vigneswaran Wickii T, Pang Ka-Ming, Kulkarni Prakash, Sattler Martin, Vaidehi Nagarajan, Mambetsariev Isa, Kindler Hedy L, Wheeler Deric L, Salgia Ravi

机构信息

Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Chicago, IL, USA.

Department of Medical Oncology and Experimental Therapeutics, Comprehensive Cancer Center, City of Hope, Duarte, CA, USA.

出版信息

Oncogenesis. 2019 Sep 4;8(9):49. doi: 10.1038/s41389-019-0159-6.

Abstract

Squamous cell carcinoma (SCC) and malignant pleural mesothelioma (MPM) are thoracic malignancies with very poor prognosis and limited treatment options. It is an established fact that most of the solid tumors have overexpression of EPHA2 receptor tyrosine kinase. EPHA2 is known to exhibit opposing roles towards cancer progression. It functions in inhibiting cancer survival and migration via a ligand and tyrosine kinase dependent signaling (Y772). Whereas it is known to promote tumor progression and cell migration through a ligand-independent signaling (S897). We analyzed the expression profile and mutational status of the ephrin receptor A2 (EPHA2) in SCC and MPM cell lines and primary patient specimens. The EPHA2 receptor was found to be either overexpressed, mutated or amplified in SCC and MPM. In particular, the EPHA2 mutants A859D and T647M were interesting to explore, A859D Y772 dead mutant exhibited lower levels of phosphorylation at Y772 compared to T647M mutant. Molecular Dynamics simulations studies suggested that differential changes in conformation might form the structural basis for differences in the level of EPHA2 activation. Consequently, A859D mutant cells exhibited increased proliferation as well as cell migration compared to controls and T647M mutant. Kinomics analysis demonstrated that the STAT3 and PDGF pathways were upregulated whereas signaling through CBL was suppressed. Considered together, the present work has uncovered the oncogenic characteristics of EPHA2 mutations in SSC and MPM reinstating the dynamics of different roles of EPHA2 in cancer. This study also suggests that a combination of doxazosin and other EPHA2 inhibitors directed to inhibit the pertinent signaling components may be a novel therapeutic strategy for MPM and Non-small cell lung cancer patients who have either EPHA2 or CBL alterations.

摘要

鳞状细胞癌(SCC)和恶性胸膜间皮瘤(MPM)是预后极差且治疗选择有限的胸部恶性肿瘤。大多数实体瘤都存在EPH A2受体酪氨酸激酶过表达,这是一个既定事实。已知EPH A2在癌症进展中发挥着相反的作用。它通过依赖配体和酪氨酸激酶的信号传导(Y772)抑制癌症存活和迁移。而通过不依赖配体的信号传导(S897),它又促进肿瘤进展和细胞迁移。我们分析了SCC和MPM细胞系以及原发性患者标本中ephrin受体A2(EPH A2)的表达谱和突变状态。发现EPH A2受体在SCC和MPM中要么过表达、要么发生突变或扩增。特别是,EPH A2突变体A859D和T647M值得研究,与T647M突变体相比,A859D Y772失活突变体在Y772处的磷酸化水平较低。分子动力学模拟研究表明,构象的差异变化可能构成EPH A2激活水平差异的结构基础。因此,与对照和T647M突变体相比,A859D突变体细胞的增殖和细胞迁移增加。激酶组学分析表明,STAT3和PDGF途径上调,而通过CBL的信号传导受到抑制。综合来看,本研究揭示了EPH A2突变在SSC和MPM中的致癌特征,恢复了EPH A2在癌症中不同作用的动态变化。这项研究还表明,多沙唑嗪与其他旨在抑制相关信号成分的EPH A2抑制剂联合使用,可能是针对EPH A2或CBL发生改变的MPM和非小细胞肺癌患者的一种新的治疗策略。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/22c6/6726628/99664f06961d/41389_2019_159_Fig1_HTML.jpg

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