We describe the synthesis and biological evaluation of N-aryl-5-aryloxazol-2-amine derivatives that are able to inhibit 5-lipoxygenase (5-LOX), a key enzyme of leukotriene synthesis, for the treatment of inflammation-related diseases including asthma and rheumatoid arthritis. A novel structural moiety containing oxazole was initially identified from a chemical library using an in vitro enzymatic and cell-based assay, and its synthesized oxazole derivatives were further examined to develop a structure–activity relationship (SAR). SAR analysis demonstrated that a hydroxyl or amino group at the p-position on N-phenyl was essential for the 5-LOX-inhibitory activities of the derivatives, and that other halogen and methyl group-substituted derivatives affected the potency, positively or negatively. As a result, derivatives selected through first-round screening were further optimized using a cell-based assay and an in vivo assay to develop a potent, selective 5-LOX inhibitor. A final hit exhibited an improved efficacy in arachidonic acid-induced ear edema when applied topically but not orally. Moreover, it showed the additional advantage of sustainable antiinflammatory activity over a reference compound, zileuton. Taken together, chemical entities bearing an oxazole scaffold could be promising as therapeutic drugs for the treatment of chronic inflammatory skin disorders.
我们描述了能够抑制
白三烯合成关键酶 5-脂氧合酶(5-LOX)的 N-芳基-5-芳基
恶唑-2-胺衍
生物的合成和
生物学评价,这些衍
生物可用于治疗包括哮喘和类风湿性关节炎在内的炎症相关疾病。利用体外酶促和细胞检测法从
化学库中初步鉴定出了一种含有
噁唑的新型结构分子,并进一步研究了其合成的
噁唑衍
生物,以建立结构-活性关系(
SAR)。
SAR 分析表明,N-苯基 p 位上的羟基或
氨基对衍
生物的 5-LOX 抑制活性至关重要,而其他卤素和甲基取代的衍
生物会对药效产生或正或负的影响。因此,通过第一轮筛选选出的衍
生物利用细胞检测和体内检测进行了进一步优化,以开发出一种强效、选择性的 5-LOX
抑制剂。最终发现的一种衍
生物在
花生四烯酸诱发的耳部
水肿方面具有更好的疗效。此外,与参考化合物齐鲁通(zileuton)相比,它还具有持续抗炎活性的额外优势。综上所述,含有
噁唑支架的
化学实体有望成为治疗慢性皮肤炎症的药物。