Nicotinamide nucleotide transhydrogenase-mediated redox homeostasis promotes tumor growth and metastasis in gastric cancer.

Nicotinamide nucleotide transhydrogenase-mediated redox homeostasis promotes tumor growth and metastasis in gastric cancer.
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烟酰胺核苷酸转氢酶介导的氧化还原稳态促进胃癌肿瘤生长和转移

DOI:
10.1016/j.redox.2018.07.017
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发表时间:
2018-09
期刊:
影响因子:
11.4
通讯作者:
Ju HQ
Ju HQ
中科院分区:
生物学1区
文献类型:
--
作者:
Li S;Zhuang Z;Wu T;Lin JC;Liu ZX;Zhou LF;Dai T;Lu L;Ju HQ

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克服氧化应激是肿瘤生长和转移的关键步骤,但胃癌的潜在机制尚不清楚。在这项研究中,我们发现,在胃癌中,烟酰胺核苷酸转氢酶(NNT)的过度表达与较短的总生存期和无病生存期相关。NNT被认为是一种关键的抗氧化酶,基于其从NADH再生NADPH的能力。敲除NNT可显著降低NADPH的含量,诱导高水平的ROS,并在葡萄糖剥夺和失巢凋亡等氧化应激条件下诱导细胞凋亡。体内实验表明,NNT促进胃癌的生长、肺转移和腹膜播散。此外,肿瘤内注射NNT siRNA显著抑制患者来源的异种移植物(PDX)模型中的胃肿瘤生长。总之,我们的研究突出了NNT在氧化还原调节和肿瘤进展中的关键功能作用,从而提出了一个重要的胃癌治疗假设。
Overcoming oxidative stress is a critical step for tumor growth and metastasis, however the underlying mechanisms in gastric cancer remain unclear. In this study, we found that overexpression of nicotinamide nucleotide transhydrogenase (NNT) was associated with shorter overall and disease free survival in gastric cancer. The NNT is considered a key antioxidative enzyme based on its ability to regenerate NADPH from NADH. Knockdown of NNT caused significantly NADPH reduction, induced high levels of ROS and significant cell apoptosis under oxidative stress conditions such as glucose deprival and anoikis. In vivo experiments showed that NNT promoted tumor growth, lung metastasis and peritoneal dissemination of gastric cancer. Moreover, intratumoral injection of NNT siRNA significantly suppressed gastric tumor growth in patient-derived xenograft (PDX) models. Overall, our study highlights the crucial functional roles of NNT in redox regulation and tumor progression and thus raises an important therapeutic hypothesis in gastric cancer.
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