title: Study on the synthesis, biological activity and spectroscopy of naphthalimide-diamine conjugates.
abstract: Eleven novel naphthalimide-diamine conjugates were synthesized and their structures were confirmed by elemental analysis, 1H-NMR, 13C-NMR and MS. Their in vitro antitumor activities were assessed using MTT assays on two cancerous cell lines K562, HCT116, and one normal hepatoma cell line QSG 7701. Compound 7f exhibited potent antitumor activity on HCT116 cells and favorable cell selectivity toward QSG 7701 compared with the positive control, amonafide. Moreover, 7f could block HeG2 cells in the G2/M phase and induce HeG2 cells apoptosis. The interaction of compound 7f with herring sperm DNA was studied by UV/vis absorption and fluorescence spectroscopy under physiological conditions (pH = 7.4). The observed spectral quenching of compound 7f by DNA and the displacement of EB from DNA-EB complex by compound 7f indicated that compound 7f could intercalate into DNA base pairs, which was also corroborated by the effect of KI on compound-DNA interaction. Further caloric fluorescent tests revealed that the quenching mechanism was a static type. Meanwhile, the binding constants, thermodynamic parameters and the effect of NaCl on compound-DNA interaction showed that the type of interaction force was mainly hydrogen bonds and the binding process was driven by hydrogen and van der Waals bonding.
authors.affiliation: Institute of Chemical Biology, Henan University, Kaifeng 475004, China. tzynew@sohu.com.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Tian
authors.affiliation: Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng 475004, China. Lijinghua@henu.edu.cn.
authors.forename: Jing-Hua
authors.initials: JH
authors.lastname: Li
authors.affiliation: Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng 475004, China. Liqian426@163.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.affiliation: Institute of Chemical Biology, Henan University, Kaifeng 475004, China. Zangfenglei@sohu.com.
authors.forename: Feng-Lei
authors.initials: FL
authors.lastname: Zang
authors.affiliation: Institute of Chemical Biology, Henan University, Kaifeng 475004, China. Zhaozhonghua@sohu.com.
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Zhao
authors.affiliation: Institute of Chemical Biology, Henan University, Kaifeng 475004, China. wcjsxq@henu.edu.cn.
authors.forename: Chao-Jie
authors.initials: CJ
authors.lastname: Wang
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D003959:Diamines / Q000737:chemistry*; D016195:G2 Phase / Q000187:drug effects; D045325:HCT116 Cells; D056945:Hep G2 Cells; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D053644:Naphthalimides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000970:Antineoplastic Agents; D003959:Diamines; D053644:Naphthalimides