The role of hypoxic tumour cells in resistance to radiotherapy, and in suppression of immune response, continues to endorse tumour hypoxia as a bona fide, yet largely untapped, drug target. Radiotherapy innovations such as stereotactic body radiotherapy herald new opportunities for classical oxygen-mimetic radiosensitisers. Only nimorazole is used clinically as a radiosensitiser, and there is a dearth of new radiosensitisers in development. In this report, we augment previous work to present new nitroimidazole alkylsulfonamides and we document their cytotoxicity and ability to radiosensitise anoxic tumour cells in vitro. We compare radiosensitisation with etanidazole and earlier nitroimidazole sulfonamide analogues and we identify 2-nitroimidazole and 5-nitroimidazole analogues with marked tumour radiosensitisation in ex vivo assays of surviving clonogens and with in vivo tumour growth inhibition.
缺氧肿瘤细胞在抗放疗和抑制免疫反应方面的作用,继续证明肿瘤缺氧是一个真正的、但在很大程度上尚未开发的药物靶点。立体定向体放疗等放疗创新为经典的仿氧放射增敏剂带来了新的机遇。目前临床上只有尼莫拉唑被用作放射增敏剂,而正在开发的新型放射增敏剂却十分匮乏。在本报告中,我们对之前的工作进行了补充,提出了新的硝基咪唑烷基磺酰胺类药物,并记录了它们的细胞毒性和体外使缺氧肿瘤细胞放射增敏的能力。我们比较了依他尼达唑和早期硝基咪唑磺酰胺类似物的放射增敏作用,并确定了 2-硝基咪唑和 5-硝基咪唑类似物,它们在存活克隆体的体内外试验中具有明显的肿瘤放射增敏作用,并能抑制体内肿瘤生长。