中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
6-氯嘌呤核苷 | 6-Chloropurine riboside | 5399-87-1 | C10H11ClN4O4 | 286.675 |
The use of cancer chemotherapy sensitizers is a promising approach to induce the effect of clinically used anticancer treatments. One of the interesting targets is Tyrosyl-DNA Phosphodiesterase 1 (Tdp1), a DNA-repair enzyme, that may prevent the action of clinical Topoisomerase 1 (Top1) inhibitors, such as topotecan (Tpc). Tdp1 eliminates covalent Top1-DNA (Top1c) complexes that appear under the action of topotecan and determines the cytotoxic effect of this drug. We hypothesize that Tdp1 inhibition would sensitize cells towards the effect of Tpc. Herein, we report the synthesis and study of lipophilic derivatives of purine nucleosides that efficiently suppress Tdp1 activity, with IC50 values in the 0.3–22.0 μM range. We also showed that this compound class can enhance DNA damage induced by topotecan in vitro by Comet assay on human cell lines HeLa and potentiate the antitumor effect of topotecan in vivo on a mice ascitic Krebs-2 carcinoma model. Thereby, this type of compound may be useful to develop drugs, that sensitize the effect of topotecan and reduce the required dose and, as a result, side effects.
使用癌症化疗增敏剂是诱导临床使用的抗癌治疗效果的一种很有前景的方法。其中一个有趣的靶点是酪氨酰-DNA磷酸二酯酶1(Tdp1),它是一种DNA修复酶,可阻止拓扑异构酶1(Top1)抑制剂(如拓扑替康(Tpc))的作用。Tdp1 能消除在托泊替康作用下出现的 Top1-DNA(Top1c)共价复合物,并决定这种药物的细胞毒性作用。我们假设抑制 Tdp1 会使细胞对 Tpc 的作用敏感。在此,我们报告了亲脂性嘌呤核苷衍生物的合成和研究,它们能有效抑制 Tdp1 的活性,IC50 值在 0.3-22.0 μM 范围内。我们还发现,通过彗星试验(Comet assay)对人细胞株 HeLa 进行体外检测,这类化合物能增强托泊替康诱导的 DNA 损伤,并能增强托泊替康对小鼠腹水克雷布斯-2 癌模型的体内抗肿瘤作用。因此,这种化合物可能有助于开发药物,使托泊替康的作用更加敏感,从而减少所需剂量和副作用。