title: New heterobimetallic Cu(II)-Sn2(IV) complex as potential topoisomerase I inhibitor: in vitro DNA binding, cleavage and cytotoxicity against human cancer cell lines.
abstract: The new heterobimetallic Cu(II)-Sn(2)(IV)/Ni(II)-Sn(2)(IV) complexes 1 and 2 bearing bioactive pharmacophore ligand scaffold; 1,10-phenanthroline and ethylenediamine were synthesized and characterized by spectroscopic (IR, UV-vis, NMR, ESI-MS) and analytical methods. The in vitro DNA binding studies of 1 and 2 with CT-DNA were carried out by employing various biophysical methods which reveal strong electrostatic binding via phosphate backbone of DNA helix, in addition to partial intercalation in the minor groove and stabilized by intramolecular hydrogen bonding. To gain further insight into the molecular recognition at the target site, UV-vis titrations of 1 with 5'-GMP was carried out and validated by (1)H and (31)P NMR. Complex 1 cleaved pBR322 DNA via oxidative pathway and exhibited high inhibition activity against Topo-I at 20 μM. Furthermore, the cytotoxicity of 1 was examined on a panel of human tumor cell lines of different histological origins showing promising antitumor activity.
authors.affiliation: Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, India. tsartaj62@yahoo.com
authors.forename: Sartaj
authors.initials: S
authors.lastname: Tabassum
authors.forename: Mohd
authors.initials: M
authors.lastname: Afzal
authors.forename: Farukh
authors.initials: F
authors.lastname: Arjmand
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D001483:Base Sequence; D045744:Cell Line, Tumor; D003300:Copper / Q000737:chemistry*; D004247:DNA / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D053837:DNA Cleavage / Q000187:drug effects*; D004264:DNA Topoisomerases, Type I / Q000737:chemistry / Q000378:metabolism; D004996:Ethidium / Q000378:metabolism; D006157:Guanosine Monophosphate / Q000378:metabolism; D006801:Humans; D062105:Molecular Docking Simulation; D009369:Neoplasms / Q000201:enzymology / Q000235:genetics / Q000473:pathology; D009690:Nucleic Acid Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D011487:Protein Conformation; D017382:Reactive Oxygen Species / Q000378:metabolism; D014001:Tin / Q000737:chemistry*; D059004:Topoisomerase I Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D014783:Viscosity
chemical_list: D000970:Antineoplastic Agents; D009942:Organometallic Compounds; D017382:Reactive Oxygen Species; D059004:Topoisomerase I Inhibitors; D014001:Tin; D003300:Copper; D006157:Guanosine Monophosphate; D004247:DNA; D004264:DNA Topoisomerases, Type I; D004996:Ethidium