Wild-type IDH2 promotes the Warburg effect and tumor growth through HIF1α in lung cancer

作者：Li, Jiangjiang; He, Ya; Tan, Zheqiong; Lu, Jingchen; Li, Liling; Song, Xin; Shi, Feng; Xie, Longlong; You, Shuo; Luo, Xiangjian; Li, Namei; Li, Yueshuo; Liu, Xiaolan; Tang, Min; Weng, Xinxian; Yi, Wei; Fan, Jia; Zhou, Jian; Qiang, Gao; Qiu, ShuangJian; Wu, Weizhong; Bode, Ann M.; Cao, Ya

来源：Theranostics, 2018, 8(15): 4050-4061.

DOI：10.7150/thno.21524

• isocitrate dehydrogenase 2
• lung cancer
• Warburg effect
• tumor growth
• HIF1-alpha

Hotspot mutations of isocitrate dehydrogenase 1 and 2 (IDH1/2) have been studied in several cancers. However, the function of wild-type IDH2 in lung cancer and the mechanism of its contribution to growth of cancer cells remain unknown. Here, we explored the role and mechanism of wild-type IDH2 in promoting growth of lung cancer. @@@ Methods: Information regarding genomic and clinical application focusing on IDH2 in cancer was examined in several databases of more than 1,000 tumor samples. IDH2 expression was assessed by immunohistochemistry in tissues from lung cancer patients. The biological functions of IDH2 were evaluated by using cell-based assays and in vivo xenograft mouse models. @@@ Results: Here we reported that wild-type IDH2 is up-regulated and is an indicator of poor survival in lung cancer and several other cancers. Targeting IDH2 with shRNA resulted in decreased HIF1 alpha expression, leading to the attenuation of lung cancer cell proliferation and tumor growth. Treatment of lung cancer cells with AGI-6780 (a small molecule inhibitor of IDH2), PX-478 (an inhibitor of HIF1 alpha) or incubation with octyl-alpha-KG inhibited lung cancer cell proliferation. @@@ Conclusion: IDH2 promotes the Warburg effect and lung cancer cell growth, which is mediated through HIF1 alpha activation followed by decreased alpha-KG. Therefore, IDH2 could possibly serve as a novel therapeutic target for lung cancer.

• 出版日期2018
• 单位复旦大学; 中南大学; 昆明医科大学