AbstractRibosome S6 Protein Kinase 2 (RSK2) is involved in many signal pathways such as cell growth, proliferation, survival and migration in tumors. Also, RSK2 can phosphorylate YB‐1, which induces the expression of tumor initiating cells, leading to poor prognosis of triple negative breast cancer. Herein, phenyl sulfonamide was introduced to a series of 1H‐pyrrolo[2,3‐b]pyridine‐2‐carboxamide derivatives to obtain novel RSK2 inhibitors which were evaluated RSK2 inhibitory activity and proliferation inhibitory activity against MDA‐MB‐468. The newly introduced sulfonamide group was observed to form a hydrogen bond with target residue LEU‐74 which played crucial role in activity. The results showed that most of compounds exhibited RSK2 enzyme inhibitory with IC50 up to 1.7 nM. Compound B1 exhibited the strongest MDA‐MB‐468 cell anti‐proliferation activity (IC50 = 0.13 μM). The in vivo tumor growth inhibitory activities were evaluated with compounds B1‐B3 in MDA‐MB‐468 xenograft model which gave up to 54.6% of TGI.
摘要核糖体S6蛋白激酶2(RSK2)参与肿瘤细胞生长、增殖、存活和迁移等多种信号通路。同时,RSK2能使YB-1磷酸化,从而诱导肿瘤始基细胞的表达,导致三阴性乳腺癌预后不良。本文将苯磺酰胺引入到一系列 1H-吡咯并[2,3-b]吡啶-2-甲酰胺衍生物中,得到了新型 RSK2 抑制剂,并评估了其对 MDA-MB-468 的 RSK2 抑制活性和增殖抑制活性。观察到新引入的磺酰胺基团与目标残基 LEU-74 形成氢键,这在活性中起到了关键作用。结果表明,大多数化合物都具有抑制 RSK2 酶的作用,IC50 高达 1.7 nM。化合物 B1 对 MDA-MB-468 细胞的抗增殖活性最强(IC50 = 0.13 μM)。化合物 B1-B3 在 MDA-MB-468 异种移植模型中评估了体内肿瘤生长抑制活性,其 TGI 高达 54.6%。