title: Design and synthesis of 3'- and 5'-O-(3-benzenesulfonylfuroxan-4-yl)-2'-deoxyuridines: biological evaluation as hybrid nitric oxide donor-nucleoside anticancer agents.
abstract: A group of 3'-O- and 5'-O-(3-benzenesulfonylfuroxan-4-yl)-2'-deoxyuridines possessing a variety of substituents (H, Me, I, F, CF(3)) at the C-5 position of the nucleoside moiety were synthesized for evaluation as hybrid anticancer agents that have the ability to simultaneously release cytotoxic nitric oxide (*NO). Incubation of these nitric oxide donor-nucleoside conjugates in the presence of 18 mM L-cysteine released a high percentage of *NO (21-48% at 1 h; 37-86% at 16 h). The release of *NO in the absence of the thiol cofactor was negligible. These hybrid *NO donor-nucleosides exhibited high cellular toxicity (CC(50) = 10(-6)-10(-8) M range) against a battery of tumor cell lines (143B-LTK, 143B, EMT-6, KBALB-STK, and KBALB) and normal human fibroblasts (Hs578Bst). No differences in cytotoxicity between nontransfected (143B, KBALB) and the corresponding transfected (143B-LTK, KBALB-STK) cancer cell lines possessing the herpes simplex virus type 1 (HSV-1) thymidine kinase gene (TK(+)) were observed, indicating that expression of the viral TK enzyme did not provide a gene therapeutic effect.
authors.affiliation: Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, T6G 2N8 Canada.
authors.forename: Sameh
authors.initials: S
authors.lastname: Moharram
authors.forename: Aihua
authors.initials: A
authors.lastname: Zhou
authors.forename: Leonard I
authors.initials: LI
authors.lastname: Wiebe
authors.forename: Edward E
authors.initials: EE
authors.lastname: Knaus
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002460:Cell Line; D045744:Cell Line, Tumor; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D020030:Nitric Oxide Donors / Q000138:chemical synthesis* / Q000494:pharmacology; D010069:Oxadiazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014529:Uridine / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D020030:Nitric Oxide Donors; D010069:Oxadiazoles; C010166:furoxans; D014529:Uridine