Ovarian cancer (OC) is one of the most common gynecologic neoplasia and has the highest mortality rate, which is mainly due to late-stage diagnosis and chemotherapy resistance. There is an urgent need to explore new and better therapeutic strategies. We have previously described a family of Microtubule Destabilizing Sulfonamides (MDS) that does not trigger multidrug-mediated resistance in OC cell lines. MDS bind to the colchicine site of tubulin, disrupting the microtubule network and causing antiproliferative and cytotoxic effects. In this work, a novel microtubule-destabilizing agent (PILA9) was synthetized and characterized. This compound also inhibited OC cell proliferation and induced G2/M cell cycle arrest and apoptosis. Interestingly, PILA9 was significantly more cytotoxic than MDS. Here, we also analyzed the effect of these microtubule-destabilizing agents (MDA) in combination with Panobinostat, a pan-histone deacetylase inhibitor. We found that Panobinostat synergistically enhanced MDA-cytotoxicity. Mechanistically, we observed that Panobinostat and MDA induced α-tubulin acetylation and that the combination of both agents enhanced this effect, which could be related to the observed synergy. Altogether, our results suggest that MDA/Panobinostat combinations could represent new therapeutic strategies against OC.
卵巢癌(OC)是最常见的妇科肿瘤之一,也是死亡率最高的肿瘤,其主要原因是晚期诊断和化疗耐药。目前迫切需要探索新的、更好的治疗策略。我们以前曾描述过一个微管破坏稳定磺酰胺类药物(MDS)家族,它不会在 OC 细胞系中引发多药介导的耐药性。MDS 与微管蛋白的秋水仙碱位点结合,破坏微管网络,产生抗增殖和细胞毒性作用。本研究合成并鉴定了一种新型微管破坏剂(PILA9)。该化合物还能抑制 OC 细胞增殖,诱导 G2/M 细胞周期停滞和细胞凋亡。有趣的是,PILA9 的细胞毒性明显高于 MDS。在此,我们还分析了这些微管破坏剂(MDA)与泛组蛋白去乙酰化酶抑制剂 Panobinostat 联用的效果。我们发现,Panobinostat 能协同增强 MDA 的毒性。从机理上讲,我们观察到 Panobinostat 和 MDA 可诱导 α-微管蛋白乙酰化,而两种药物的联合使用可增强这种效应,这可能与观察到的协同作用有关。总之,我们的研究结果表明,MDA/帕诺比诺司他联合用药可作为治疗 OC 的新策略。