Novel 1<i>H</i>-Pyrazole-3-carboxamide Derivatives: Synthesis, Anticancer Evaluation and Identification of Their DNA-Binding Interaction
作者:Yi Lu、Ting Ran、Guowu Lin、Qiaomei Jin、Jianling Jin、Hongmei Li、Hao Guo、Tao Lu、Yue Wang
DOI:10.1248/cpb.c13-00676
日期:——
Four novel 1H-pyrazole-3-carboxamide derivatives were synthesized, and their antiproliferative effect on cancer cells, kinase inhibition, and in particular, the DNA-binding interaction were investigated to interpret the antitumor mechanisms. A DNA minor groove binding model was developed, and the binding energy was predicted for the compounds. In consistence with the prediction, the binding ability was determined by the electronic absorption spectroscopy under physiological conditions for the compounds, and further verified by viscosity measurement. One compound 5-(3-cyclopropylureido)-N-[4-[(4-methylpiperazin-1-yl)methyl]phenyl]-1-H-pyrazole-3-carboxamide (pym-5) exerted the highest DNA-binding affinity (Kpym-5=1.06×105 M−1). And it demonstrated more than 50% decrease of the emission intensity of the ethidium bromide–calf thymus DNA (EB–CT-DNA) complex in fluorescence spectra, suggesting that pym-5 could strongly affect the DNA conformation. Furthermore, pym-5 showed the cleavage activity upon the supercoiled plasmid pBR322 DNA in the pBR322 DNA cleavage assay. Our study suggests that DNA may serve as a potential target to these pyrazole derivatives.
合成了四种新型 1H-吡唑-3-甲酰胺衍生物,并研究了它们对癌细胞的抗增殖作用、激酶抑制作用,特别是 DNA 结合相互作用,以解释抗肿瘤机制。开发了 DNA 小沟结合模型,并预测了化合物的结合能。与预测一致,在生理条件下通过电子吸收光谱测定了化合物的结合能力,并通过粘度测量进一步验证。一种化合物 5-(3-环丙基脲基)-N-[4-[(4-甲基哌嗪-1-基)甲基]苯基]-1-H-吡唑-3-甲酰胺 (pym-5) 具有最高的 DNA 结合能力亲和力(Kpym-5=1.06×105 M−1)。结果表明,荧光光谱中溴化乙锭-小牛胸腺 DNA (EB-CT-DNA) 复合物的发射强度降低了 50% 以上,表明 pym-5 可以强烈影响 DNA 构象。此外,在 pBR322 DNA 切割测定中,pym-5 对超螺旋质粒 pBR322 DNA 显示出切割活性。我们的研究表明 DNA 可能作为这些吡唑衍生物的潜在靶标。