化学
小分子
组合化学
结构-活动关系
立体化学
生物化学
体外
作者
Chengliang Sun,Yong He,Gefei Wang,Guoyu Zhang,Yu Zhang,Hao Shen,Lingrong Hu,Yanze Sun,Bo Jiang,Xiao Wang,Kai Yuan,Wenjian Min,Liping Wang,Haopeng Sun,Yibei Xiao,Peng Yang
标识
DOI:10.1021/acs.jmedchem.3c02039
摘要
VISTA (V-domain Ig suppressor of T cell activation) is a novel immune checkpoint protein and represents a promising target for cancer immunotherapy. Here, we report the design, synthesis, and evaluation of a series of methoxy-pyrimidine-based VISTA small molecule inhibitors with potent antitumor activity. By employing molecular docking and microscale thermophoresis (MST) assay, we identified a lead compound A1 that binds to VISTA protein with high affinity and optimized its structure. A4 was then obtained, which exhibited the strongest binding ability to VISTA protein, with a KD value of 0.49 ± 0.20 μM. In vitro, A4 significantly activated peripheral blood mononuclear cells (PBMCs) induced the release of cytokines such as IFN-γ and enhanced the cytotoxicity of PBMCs against tumor cells. In vivo, A4 displayed potent antitumor activity and synergized with PD-L1 antibody to enhance the therapeutic effect against cancer. These results suggest that compound A4 is an effective VISTA small molecule inhibitor, providing a basis for the future development of VISTA-targeted drugs.
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