Design, Synthesis and Biological Evaluation of Novel 1,2,5-Oxadiazol-3- Carboximidamide Derivatives as Indoleamine 2, 3-Dioxygenase 1 (IDO1) Inhibitors

Author(s): Zhifeng Xia, Yanyang Nan, Chang Liu, Guangyu Lin, Kedan Gu, Cheng Chen, Weili Zhao, Dianwen Ju, Xiaochun Dong*

Journal Name: Anti-Cancer Agents in Medicinal Chemistry
(Formerly Current Medicinal Chemistry - Anti-Cancer Agents)

Volume 20 , Issue 13 , 2020

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Graphical Abstract:


Background and Objective: Indoleamine-2,3-dioxygenase 1 (IDO1), which catalyzes the degradation of L-tryptophan (L-Trp) to N-formyl kynurenine (NFK) in the first and rate-limiting step of Kynurenine (KYN) pathway has been identified as a promising therapeutic target for cancer immunotherapy. The small molecule Epacadostat developed by Incyte Corp is the most advanced IDO1 inhibitor in clinical trials.

Methods: In this study, various amidine derivatives were individually installed as the polar capping group onto the amino ethylene side chain to replace the sulfamoylamino moiety of Epacadostat to develop novel IDO1 inhibitors. A series of novel 1,2,5-oxadiazol-3-carboximidamide derivatives were designed, prepared, and evaluated for their inhibitory activities against human IDO1 enzyme and cellular IDO1.

Results: In vitro human IDO1 enzyme and cellular IDO1 assay results demonstrate that the inhibitory activities of compound 13a and 13b were comparable to Epacadostat, with the enzymatic IC50 values of 49.37nM and 52.12nM and cellular IC50 values of 12.34nM and 14.34nM, respectively. The anti-tumor efficacy of 13b is slightly better than Epacadosta in Lewis Lung Cancer (LLC) tumor-bearing mice model.

Conclusion: 13b is a potent IDO1 inhibitor with therapeutic potential in tumor immunotherapy.

Keywords: IDO1 inhibitors, amidine, 1, 2, 5-oxadiazol-3-carboximidamide, Lewis lung cancer, immunotherapy, NFK.

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Article Details

Year: 2020
Published on: 14 September, 2020
Page: [1592 - 1603]
Pages: 12
DOI: 10.2174/1871520620666200604121225
Price: $65

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