Tropomyosin receptor kinase (TRK) is a promising target for treating NTRK fusion cancers. The solvent front and xDFG mutations induced by larotrectinib and entrectinib result in acquired resistance in advanced-stage patients. In this study, we report a highly potent and selective type II TRK inhibitor, 40l, developed using a structure-based design strategy. Compound 40l significantly suppressed Km-12, Ba/F3-TRKA^G595R, and Ba/F3-TRKA^G667C cell proliferation. In biochemical and cellular assays, 40l showed better inhibitory activity against TRKA^G667C than that by the positive control, selitrectinib. Additionally, it induced apoptosis of Ba/F3-TRKA^G595R and Ba/F3-TRKA^G667C cells in a dose-dependent manner. Furthermore, 40l showed good selectivity for a panel of 41 kinases. In vitro assays indicated that 40l possessed outstanding plasma stability and moderate liver microsomal stability. Based on the above results, compound 40l could be further optimized to overcome the solvent front and xDFG TRK mutations.

原肌球蛋白受体激酶 (TRK) 是治疗NTRK融合癌症的一个有前景的靶点。 larotrectinib 和 entrectinib诱导的溶剂前沿和 xDFG 突变导致晚期患者获得性耐药。在这项研究中，我们报告了一种高效、选择性的 II 型 TRK 抑制剂40l ，它是使用基于结构的设计策略开发的。化合物40l显着抑制Km-12、Ba/F3-TRKA ^G595R和Ba/F3-TRKA ^G667C细胞增殖。在生化和细胞测定中， 40l对 TRKA ^G667C显示出比阳性对照 Selitrectinib 更好的抑制活性。此外，它还以剂量依赖性方式诱导 Ba/F3-TRKA ^G595R和 Ba/F3-TRKA ^G667C细胞凋亡。此外， 40l对一组 41 种激酶表现出良好的选择性。体外试验表明40l具有出色的血浆稳定性和中等的肝微粒体稳定性。基于上述结果，化合物40l可以进一步优化以克服溶剂前沿和xDFG TRK突变。