title: Synthesis, characterization and biological activity of lanthanum(III) complexes containing 2-methylene-1,10-phenanthroline units bridged by aliphatic diamines.
abstract: Two novel lanthanum(III) complexes containing 2-methylene-1,10-phenanthroline units bridged by aliphatic diamines were synthesized and characterized by elemental analysis, IR, NMR, thermal analysis and conductance measurements. They have been assayed for anticancer activity in vitro against HL-60 (human leukocytoma) cells, PC-3MIE8 (human prostate carcinoma) cells, BGC-823 (human stomach carcinoma) cells, MDA-MB-435 (human galactophore carcinoma) cells, Bel-7402 (human liver carcinoma) cells, and Hela (human cervix carcinoma) cells. The results show that the two complexes exhibit good cytotoxic activities against different cell lines in general, especially more effective than cisplatin against Bel-7402, BGC-823 and MDA-MB-435 cell lines. DNA-binding studies indicate that, besides the intercalation, the complexes bind to DNA by the other interaction(s), which might be responsible for the production of more compact DNA, coinciding with more A-like feature of DNA as suggested by CD spectra.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Feng-Hua
authors.initials: FH
authors.lastname: Li
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Zhao
authors.forename: Hong-Xing
authors.initials: HX
authors.lastname: Wu
authors.forename: Hai
authors.initials: H
authors.lastname: Lin
authors.forename: Xiang-Xia
authors.initials: XX
authors.lastname: Wu
authors.forename: Shou-Rong
authors.initials: SR
authors.lastname: Zhu
authors.forename: Hua-Kuan
authors.initials: HK
authors.lastname: Lin
mesh_terms: D045744:Cell Line, Tumor; D002942:Circular Dichroism; D003959:Diamines / Q000737:chemistry* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D005227:Fatty Acids / Q000737:chemistry* / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D007364:Intercalating Agents / Q000633:toxicity; D007811:Lanthanum / Q000737:chemistry* / Q000494:pharmacology; D008024:Ligands; D013058:Mass Spectrometry; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D010618:Phenanthrolines / Q000737:chemistry* / Q000494:pharmacology; D013050:Spectrometry, Fluorescence; D014407:Tumor Cells, Cultured; D014783:Viscosity
chemical_list: D003959:Diamines; D005227:Fatty Acids; D007364:Intercalating Agents; D008024:Ligands; D009942:Organometallic Compounds; D010618:Phenanthrolines; D007811:Lanthanum