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• W2079280892 abstract "A series of thiosemicarbazones (TSCs) (bearing a (4)N-azabicyclo[3.2.2]nonane moiety) derived from 3-acylpyridazines, 4-acetylpyrimidines, and 2-acetylpyrazines (1-8) were synthesized as potential antitumor agents. TSCs 1-8 exhibited potent cytotoxic activity against human acute lymphoblastic leukemia CCRF-CEM cells (IC(50) = 0.05-0.77 microM) and colon adenocarcinoma HT-29 cells (IC(50) = 0.011-2.22 microM). Copper II complexes of TSCs 1-8 showed significant improvement in cytotoxic activity against HT-29 cells (IC(50) = 0.004-1.51 microM) by a factor of 3. However, complexation of ligands 1, 2, 4, and 6 with Fe(II) results in lowering of cytotoxic activity by a factor of approximately 7. In clonogenic assays involving human tumor cells of different tumor origins, compounds 5, 7, 8, and their copper complexes 5Cu(II), 7Cu(II), and 8Cu(II) exhibited remarkable cytotoxic activities with mean IC(50) values of 6, 0.18, 1, 1, 0.37, and 0.37 nM, respectively. In particular, the compounds were highly effective against human colon carcinoma and large and small cell lung carcinoma cells. The TSC derivative 5 was evaluated in vivo in nude mice bearing LXFL 529 human large cell lung carcinoma cells. With respect to antitumor activity, application of 30 mg/kg/d resulted in moderate inhibition (42%) of tumor growth. No effect on tumor growth was observed at a dose of 10 mg/kg/d. However, a dose of 40 or 60 mg/kg/d resulted in 50 and 75% death, respectively, in the treated mice, indicating the high toxicity of these compounds. Using human liver microsomes, compound 5 was found to be rapidly and highly metabolized in vitro. In actual fact, only 2% of the unmetabolized compound could be detected in the incubation medium after 5 min. The IC(50) for cell proliferation (0.006-0.022 microM) elicited by these compounds is much lower than that of the inhibition of [(14)C]cytidine incorporation into DNA (0.18-3.32 microM). These compounds are also noncell cycle specific agents. Interestingly, compounds 5, 5Cu(II), and 8 were found to be potent inducers of apoptosis in Burkitt's lymphoma cells." @default.
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• W2079280892 title "Synthesis, Cytotoxicity, and Antitumor Activity of Copper(II) and Iron(II) Complexes of ⁴<i>N</i>-Azabicyclo[3.2.2]nonane Thiosemicarbazones Derived from Acyl Diazines" @default.
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• W2079280892 doi "https://doi.org/10.1021/jm000979z" @default.
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