Transient receptor potential melastatin 2 (TRPM2), a Ca²⁺-permeable cationic channel, plays critical roles in insulin release, cytokine production, body temperature regulation and cell death as a reactive oxygen species (ROS) and temperature sensor. However, few TRPM2 inhibitors have been reported, especially TRP-subtype selective inhibitors, which hampers the investigation and validation of TRPM2 as a drug target. To discover novel TRPM2 inhibitors, 3D similarity-based virtual screening method was employed, by which 2,3-dihydroquinazolin-4(1H)-one derivative H1 was identified as a TRPM2 inhibitor. A series of novel 2,3-dihydroquinazolin-4(1H)-one derivatives were subsequently synthesized and characterized. Their inhibitory activities against the TRPM2 channel were evaluated by calcium imaging and electrophysiology approaches. Some of the compounds exhibited significant inhibitory activity, especially D9 which showed an IC₅₀ of 3.7 μM against TRPM2 and did not affect the TRPM8 channel. The summarized structure-activity relationship (SAR) provides valuable insights for further development of specific TRPM2 targeted inhibitors.

Ca ²⁺渗透性阳离子通道瞬态受体电位melastatin 2（TRPM2）在胰岛素释放，细胞因子生成，体温调节和细胞死亡中起着活性氧（ROS）和温度传感器的作用。但是，很少有TRPM2抑制剂的报道，特别是TRP亚型选择性抑制剂，这阻碍了TRPM2作为药物靶标的研究和验证。为了发现新型TRPM2抑制剂，采用了基于3D相似性的虚拟筛选方法，将2,3-二氢喹唑啉-4（1 H）-一衍生物H1鉴定为TRPM2抑制剂。一系列新颖的2,3-二氢喹唑啉-4（1 H）-衍生物随后被合成和表征。通过钙成像和电生理方法评估了它们对TRPM2通道的抑制活性。一些化合物表现出显着的抑制活性，尤其是D9，其对TRPM2的IC ₅₀为3.7μM，并且不影响TRPM8通道。总结的结构活性关系（SAR）为进一步开发特定TRPM2靶向抑制剂提供了宝贵的见识。