氮氧化物4
生物
NADPH氧化酶
基因沉默
肿瘤进展
癌症研究
细胞生物学
生物化学
基因
活性氧
作者
Irene Peñuelas‐Haro,Rut Espinosa‐Sotelo,Eva Crosas‐Molist,Macarena Herranz‐Itúrbide,Daniel Caballero‐Díaz,Ania Alay,Xavier Solé,Emilio Ramos,Teresa Serrano,María Luz Martínez‐Chantar,Ulla G. Knaus,José M. Cuezva,António Zorzano,Esther Bertrán,Isabel Fabregat
出处
期刊:Hepatology
[Wiley]
日期:2022-09-17
卷期号:78 (2): 416-433
被引量:6
摘要
The NADPH oxidase NOX4 plays a tumor-suppressor function in HCC. Silencing NOX4 confers higher proliferative and migratory capacity to HCC cells and increases their in vivo tumorigenic potential in xenografts in mice. NOX4 gene deletions are frequent in HCC, correlating with higher tumor grade and worse recurrence-free and overall survival rates. However, despite the accumulating evidence of a protective regulatory role in HCC, the cellular processes governed by NOX4 are not yet understood. Accordingly, the aim of this work was to better understand the molecular mechanisms regulated by NOX4 in HCC in order to explain its tumor-suppressor action.Experimental models: cell-based loss or gain of NOX4 function experiments, in vivo hepatocarcinogenesis induced by diethylnitrosamine in Nox4 -deficient mice, and analyses in human HCC samples. Methods include cellular and molecular biology analyses, proteomics, transcriptomics, and metabolomics, as well as histological and immunohistochemical analyses in tissues. Results identified MYC as being negatively regulated by NOX4. MYC mediated mitochondrial dynamics and a transcriptional program leading to increased oxidative metabolism, enhanced use of both glucose and fatty acids, and an overall higher energetic capacity and ATP level. NOX4 deletion induced a redox imbalance that augmented nuclear factor erythroid 2-related factor 2 (Nrf2) activity and was responsible for MYC up-regulation.Loss of NOX4 in HCC tumor cells induces metabolic reprogramming in a Nrf2/MYC-dependent manner to promote HCC progression.
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