Telaglenastat (CB 839) is a glutaminase 1 (GLS1) inhibitor with selective, reversible, and oral activity. Telaglenastat has antitumor activity and induces cellular autophagy.

Glutaminase:24 nM

方法：TNBC 细胞系 HCC1806、MDA-MB-231 和 ER+/HER2- 细胞系 T47D 用 Telaglenastat (0-1000 nmol/L) 处理 72 h，使用 Cell Titer Glo Assay 检测细胞活力。
结果：Telaglenastat 处理对两种 TNBC 细胞系的增殖具有有效作用，IC50 为 20-55 nmol/L，但对 T47D 细胞的生存能力没有影响。[1]
方法：6种 ccRCC 细胞系 TUHR10TKB、A-704、786-O、Caki-1、A498、769-P 用 Telaglenastat (1 µM) 处理 1 h，使用 Western Blot 检测靶点蛋白表达水平。
结果：在 Telaglenastat 存在下孵育细胞导致 S6 和 4E-BP1 的磷酸化降低。Telaglenastat 可能通过剥夺细胞由 GLS 分解谷氨酰胺产生的代谢产物来间接抑制 mTOR 信号传导。[2]

方法：为检测体内抗肿瘤活性，将 Telaglenastat (200 mg/kg，25% (w/v) HPBCD in 10 mmol/L citrate, pH 2) 口服给药给携带 TNBC 患者衍生的异种移植物的 nu/nu 小鼠，每天两次，持续 28 天。
结果：Telaglenastat 在 TNBC 异种移植模型中具有抗肿瘤活性。在研究结束时，相对于载体对照，Telaglenastat 抑制了 61% 的肿瘤生长。[1]

Inhibition of CB-839 on rHu-GAC: The enzymatic activity is measured in assay buffer containing 50 mM Tris-Acetate pH 8.6, 150 mM K2HPO4 , 0.25 mM EDTA, 0.1 mg/mL bovine serum albumin, 1 mM DTT, 2 mM NADP+ and 0.01% Triton X-100. To measure inhibition, the inhibitor (prepared in DMSO) is first pre-mixed with glutamine and glutamate dehydrogenase (GDH) and reactions are initiated by the addition of rHu-GAC. Final reactions contains 2 nM rHu-GAC, 10 mM glutamine, 6 units/mL GDH and 2% DMSO. Generation of NADPH is monitored by fluorescence (Ex340/Em460 nm) every minute for 15 minutes on a SpectraMax M5e plate reader. Relative fluorescence units (RFU) are converted to units of NADPH concentration (μM) using a standard curve of NADPH. Each assay plate incorporates control reactions that monitores the conversion of glutamate (1 to 75 μM) plus NADP+ to α-ketoglutarate plus NADPH by GDH. Under these assay conditions, up to 75 μM glutamate is stoichiometrically converts to α-ketoglutarate/NADPH by GDH. Initial reaction velocities are calculated by fitting the first 5 minutes of each progress curve to a straight line. Inhibition curves are fitted to a four-parameter dose response equation of the form: % activity = Bottom + (Top-Bottom)/(1+10^((LogIC50-X)*HillSlope)).

For viability assays, all cell lines are treated with CB-839 at the indicated concentrations for 72 hours and analyzed for antiproliferative effects using Cell Titer Glo.(Only for Reference)