1355326-35-0Relevant articles and documents
Synthesis and evaluation of radiolabeled AGI-5198 analogues as candidate radiotracers for imaging mutant IDH1 expression in tumors
Chitneni, Satish K.,Reitman, Zachary J.,Spicehandler, Rebecca,Gooden, David M.,Yan, Hai,Zalutsky, Michael R.
, p. 694 - 699 (2018/01/27)
Mutations in the metabolic enzyme isocitrate dehydrogenase 1 (IDH1) are commonly found in gliomas. AGI-5198, a potent and selective inhibitor of the mutant IDH1 enzyme, was radiolabeled with radioiodine and fluorine-18. These radiotracers were evaluated as potential probes for imaging mutant IDH1 expression in tumors with positron emission tomography (PET). Radioiodination of AGI-5198 was achieved using a tin precursor in 79 ± 6% yield (n = 9), and 18F-labeling was accomplished by the Ugi reaction in a decay-corrected radiochemical yield of 2.6 ± 1.6% (n = 5). The inhibitory potency of the analogous nonradioactive compounds against mutant IDH1 (IDH1-R132H) was determined in enzymatic assays. Cell uptake studies using radiolabeled AGI-5198 analogues revealed somewhat higher uptake in IDH1-mutated cells than that in wild-type IDH1 cells. The radiolabeled compounds displayed favorable tissue distribution characteristics in vivo, and good initial uptake in IDH1-mutated tumor xenografts; however, tumor uptake decreased with time. Radioiodinated AGI-5198 exhibited higher tumor-to-background ratios compared with 18F-labeled AGI-5198; unfortunately, similar results were observed in wild-type IDH1 tumor xenografts as well, indicating lack of selectivity for mutant IDH1 for this tracer. These results suggest that AGI-5198 analogues are not a promising platform for radiotracer development. Nonetheless, insights gained from this study may help in design and optimization of novel chemical scaffolds for developing radiotracers for imaging the mutant IDH1 enzyme.
Discovery of the first potent inhibitors of mutant IDH1 that lower tumor 2-HG in vivo
Popovici-Muller, Janeta,Saunders, Jeffrey O.,Salituro, Francesco G.,Travins, Jeremy M.,Yan, Shunqi,Zhao, Fang,Gross, Stefan,Dang, Lenny,Yen, Katharine E.,Yang, Hua,Straley, Kimberly S.,Jin, Shengfang,Kunii, Kaiko,Fantin, Valeria R.,Zhang, Shunan,Pan, Qiongqun,Shi, Derek,Biller, Scott A.,Su, Shinsan M.
, p. 850 - 855 (2013/01/15)
Optimization of a series of R132H IDH1 inhibitors from a high throughput screen led to the first potent molecules that show robust tumor 2-HG inhibition in a xenograft model. Compound 35 shows good potency in the U87 R132H cell based assay and ~90% tumor 2-HG inhibition in the corresponding mouse xenograft model following BID dosing. The magnitude and duration of tumor 2-HG inhibition correlates with free plasma concentration.