Stimulator of interferon genes (STING) is an endoplasmic reticulum-localized adaptor protein (STING receptor) that has been shown to be activated by binding to natural cyclic dinucleotide (CDN) ligands and plays a vital role in innate immune sensing of exogenous or endogenous DNA, which then induces type I interferons and other cytokines. In this paper, we described a series of amidobenzimidazole STING agonists with high potency for the STING receptor and presented the relevant structure-activity relationships (SARs). The relative potencies of compounds 16g, 24b, and 24e were measured by a STING competition binding assay. A more thorough study of the effect on the STING signaling pathway demonstrated that three compounds, 16g, 24b, and 24e, significantly increased the protein levels and mRNA levels of IFN-β, CXCL10, and IL-6, and 24b as a representative compound effectively triggered the phosphorylation of STING, TBK1, and IRF3 in both human peripheral blood mononuclear cells (hPBMCs) and WT THP-1 cells. In addition, compound 24b demonstrated impressive antitumor efficacy in mice with established syngeneic colon tumors by intravenous administration. Furthermore, the pharmacokinetic profile of compound 24b was fully evaluated.

中文翻译：

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设计，合成和生物评估酰胺基苯并咪唑衍生物作为干扰素基因（STING）受体激动剂的刺激剂。

干扰素基因刺激物（STING）是一种内质网定位的衔接蛋白（STING受体），已被证明可通过与天然环二核苷酸（CDN）配体结合而被激活，并且在外源或内源DNA的固有免疫传感中起着至关重要的作用然后诱导I型干扰素和其他细胞因子。在本文中，我们描述了一系列对STING受体具有高效力的酰胺基苯并咪唑STING激动剂，并提出了相关的构效关系（SAR）。通过STING竞争结合测定法测量化合物16g，24b和24e的相对效力。对STING信号通路影响的更彻底研究表明，三种化合物16g，24b和24e显着增加了IFN-β，CXCL10和IL-6的蛋白质水平和mRNA水平，以及作为代表化合物的24b有效地触发了人类外周血单核细胞（hPBMC）和WT THP-1细胞中STING，TBK1和IRF3的磷酸化。另外，化合物24b在具有确定的同基因结肠肿瘤的小鼠中通过静脉内给药显示出令人印象深刻的抗肿瘤功效。此外，充分评估了化合物24b的药代动力学特征。