title: Cytotoxicity of 2-aldo- and 2-ketopyridine-N(4)-substituted thiosemicarbazones and mode of action in human Tmolt4 cells.
abstract: The 2-aldo- and 2-ketopyridine-N(4)-substituted thiosemicarbazones and their copper complexes demonstrated potent cytotoxic activity against a series of murine and human suspended cultured tumor cells. Selected compounds were active against the growth of cultured cells from solid human tumors, i.e. Mck-7 breast effusion, lung A549 and lung MB-9812, bone SOS-2 and clear cell Caki renal tumor. In Tmolt4 T cell leukemia cells the compounds inhibited the syntheses of DNA, RNA and protein over 60 min at 25 to 100 microM. Multiple target sites in nucleic acid metabolism were suppressed by the agents, i.e. DNA polymerase alpha, ribonucleoside reductase, dihydrofolate reductase, de novo purine synthesis, thymidylate synthetase and nucleoside kinases. The total effects of the agents on DNA metabolism led to the reduction of deoxyribonucleotide pools as well as DNA fragmentation.
authors.affiliation: Division of Medicinal Chemistry and Natural Products, School of Pharmacy, University of North Carolina, Chapel Hill, N.C., USA.
authors.forename: I H
authors.initials: IH
authors.lastname: Hall
authors.forename: B J
authors.initials: BJ
authors.lastname: Barnes
authors.forename: J E
authors.initials: JE
authors.lastname: Rowell
authors.forename: K A
authors.initials: KA
authors.lastname: Shaffer
authors.forename: S E
authors.initials: SE
authors.lastname: Cho
authors.forename: D X
authors.initials: DX
authors.lastname: West
authors.forename: A M
authors.initials: AM
authors.lastname: Stark
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D004273:DNA, Neoplasm / Q000096:biosynthesis; D006801:Humans; D015458:Leukemia, T-Cell / Q000188:drug therapy* / Q000201:enzymology / Q000473:pathology; D051379:Mice; D009363:Neoplasm Proteins / Q000096:biosynthesis; D012334:RNA, Neoplasm / Q000096:biosynthesis; D013329:Structure-Activity Relationship; D013882:Thiosemicarbazones / Q000138:chemical synthesis* / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004273:DNA, Neoplasm; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm; D013882:Thiosemicarbazones