New steroidal imidazolidinone derivatives (7–9) were synthesized after reacting steroidal thiosemicarbazones with oxalyl chloride in absolute ethanol. After characterization by spectral and analytical data, the interaction studies of compounds (7–9) with DNA were carried out by UV–vis, fluorescence spectroscopy, circular dichroism, molecular docking and gel electrophoresis. The compounds bind to DNA preferentially through electrostatic and hydrophobic interactions with Kb; 2.31 × 104 M−1, 2.57 × 104 M−1 and 2.16 × 104 M−1, respectively indicating the higher binding affinity of compound 8 towards DNA. Gel electrophoresis demonstrated that the compounds 7–9 show strong interaction during the cleavage activity with pBR322 DNA. The docking study suggested the intercalation of imidazolidinone moiety of steroid derivative in minor groove of DNA. During in vitro cytotoxicity, compounds 7–9 revealed potential toxicity against the different human cancer cells (MTT assay). Apoptotic degradation of DNA in presence of compounds 7–9 was analyzed by agarose gel electrophoresis and visualized by ethidium bromide staining (comet assay). FACS analysis shows that the compound 8 bring about cell cycle arrest at 7 μM concentration.
新的类
固醇咪唑烷酮衍
生物(7–9)是在绝对
乙醇中将类
固醇硫脲与
草酰氯反应后合成的。通过光谱和分析数据进行表征后,进行了化合物(7–9)与DNA的相互作用研究,采用了紫外可见光谱、荧光光谱、圆二色性分光法、分子对接和凝胶电泳等方法。结果表明,这些化合物通过静电和疏
水相互作用优先与DNA结合,结合常数Kb分别为2.31×10^4 M−1、2.57×10^4 M−1和2.16×10^4 M−1,表明化合物8对DNA具有更高的结合亲和力。凝胶电泳显示化合物7–9在pB
R322 DNA断裂活性中表现出强相互作用。对接研究表明,类
固醇衍
生物的
咪唑烷酮部分嵌入在DNA的小沟中。在体外细胞毒性实验中,化合物7–9显示出对不同人癌细胞(M
TT测定)的潜在毒性。在存在化合物7–9的情况下,使用
琼脂糖凝胶电泳分析了DNA的凋亡降解,并通过
溴化乙锭染色(彗星实验)可视化。FACS分析显示,化合物8在7μM浓度下引起细胞周期停滞。