Discovery of novel tumor-targeted near-infrared probes with 6-substituted pyrrolo[2,3-d]pyrimidines as targeting ligands
作者:Yining Zhang、Zijun Luo、Lixiao Guo、Haofeng Zhang、Tongdan Su、Zhenzhen Tan、Qian Ren、Can Zhang、Yan Fu、Ruijuan Xing、Ran Guo、Xiaowei Shi、Huicai Guo、Yi Liu、Lei Wang
DOI:10.1016/j.ejmech.2023.115914
日期:2023.12
fluorescent probes were designed and synthesized based on previously reported 6-substituted pyrrolo[2,3-d]pyrimidine antifolates. All newly synthesized probes showed specific FR binding in vitro, whereas GT-NIR-4 and GT-NIR-5 with a benzene and a thiophene ring, respectively, on the side chain of pyrrolo[2,3-d]pyrimidine exhibited better FR binding affinity than that of GT-NIR-6 with folic acid as targeting
由于叶酸受体 (FRs) 在某些类型的癌症中过表达,因此已经开发了多种用于肿瘤检测的 FR 靶向荧光探针。然而,报道的探针几乎都具有相同的叶酸靶向配体,具有不同的荧光团和/或接头。在本研究中,基于先前报道的 6-取代吡咯并[2,3-d] 嘧啶抗叶酸酯设计并合成了一系列新型肿瘤靶向近红外 (NIR) 分子荧光探针。所有新合成的探针在体外均显示出特异性 FR 结合,而吡咯并[2,3-d]嘧啶侧链上分别带有苯和噻吩环的 GT-NIR-4 和 GT-NIR-5 表现出比以叶酸为靶向配体的 GT-NIR-6 更好的 FR 结合亲和力。GT-NIR-4 在 KB 荷瘤小鼠中也显示出高肿瘤摄取,具有良好的药代动力学特性和生物安全性。这项工作展示了用抗叶酸代替叶酸作为肿瘤靶向 NIR 探针的靶向配体的首次尝试。