Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland.
Endocrine Oncology Branch, National Cancer Institute, NIH, Bethesda, Maryland.
Clin Cancer Res. 2018 Aug 15;24(16):4030-4043. doi: 10.1158/1078-0432.CCR-17-3167. Epub 2018 Apr 24.
Mitochondrial glycerophosphate dehydrogenase (MGPDH) is the key enzyme connecting oxidative phosphorylation (OXPHOS) and glycolysis as well as a target of the antidiabetic drug metformin in the liver. There are no data on the expression and role of MGPDH as a metformin target in cancer. In this study, we evaluated MGPDH as a potential target of metformin in thyroid cancer and investigated its contribution in thyroid cancer metabolism. We analyzed MGPDH expression in 253 thyroid cancer and normal tissues by immunostaining and examined its expression and localization in thyroid cancer-derived cell lines (FTC133, BCPAP) by confocal microscopy. The effects of metformin on MGPDH expression were determined by qRT-PCR and Western blot analysis. Seahorse analyzer was utilized to assess the effects of metformin on OXPHOS and glycolysis in thyroid cancer cells. We analyzed the effects of metformin on tumor growth and MGPDH expression in metastatic thyroid cancer mouse models. We show for the first time that MGPDH is overexpressed in thyroid cancer compared with normal thyroid. We demonstrate that MGPDH regulates human thyroid cancer cell growth and OXPHOS rate Metformin treatment is associated with downregulation of MGPDH expression and inhibition of OXPHOS in thyroid cancer Cells characterized by high MGPDH expression are more sensitive to OXPHOS-inhibitory effects of metformin and growth-inhibitory effects of metformin and Our study established MGPDH as a novel regulator of thyroid cancer growth and metabolism that can be effectively targeted by metformin. .
线粒体甘油磷酸脱氢酶(MGPDH)是连接氧化磷酸化(OXPHOS)和糖酵解的关键酶,也是肝脏中抗糖尿病药物二甲双胍的靶点。目前尚无关于 MGPDH 作为二甲双胍在癌症中的靶点的表达和作用的相关数据。在这项研究中,我们评估了 MGPDH 作为甲状腺癌中二甲双胍的潜在靶点,并研究了其在甲状腺癌代谢中的作用。我们通过免疫染色分析了 253 例甲状腺癌和正常组织中的 MGPDH 表达,并通过共聚焦显微镜检查了甲状腺癌细胞系(FTC133、BCPAP)中 MGPDH 的表达和定位。通过 qRT-PCR 和 Western blot 分析确定了二甲双胍对 MGPDH 表达的影响。使用 Seahorse 分析仪评估了二甲双胍对甲状腺癌细胞 OXPHOS 和糖酵解的影响。我们分析了二甲双胍对转移性甲状腺癌小鼠模型中肿瘤生长和 MGPDH 表达的影响。我们首次表明,与正常甲状腺相比,MGPDH 在甲状腺癌中过度表达。我们证明 MGPDH 调节人甲状腺癌细胞生长和 OXPHOS 率。二甲双胍治疗与 MGPDH 表达下调和甲状腺癌细胞 OXPHOS 抑制有关。具有高 MGPDH 表达特征的细胞对二甲双胍的 OXPHOS 抑制作用和生长抑制作用更为敏感。我们的研究确立了 MGPDH 作为一种新型的甲状腺癌生长和代谢调节剂,可被二甲双胍有效靶向。