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    Synthesis, Topoisomerase I and II Inhibitory Activity, Cytotoxicity, and Structure-activity Relationship Study of Rigid Analogues of 2,4,6-Trisubstituted Pyridine Containing 5,6-Dihydrobenzo[h]quinoline Moiety
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    Abstract:
    DNA topoisomerases are nuclear enzymes that transiently break one or two strands of DNA, passing a single or double stranded DNA through the break and again resealing the breaks which allow to solve various DNA topological problems ge-nerated during vital cellular proce sses such as replication, trans-cription, recombination, repair, chromatin assembly and chromo-some segregation.
    Keywords:
    Quinoline
    Moiety
    Structure–activity relationship
    DNA topoisomerases are nuclear enzymes that transiently break one or two strands of DNA, passing a single or double stranded DNA through the break and again resealing the breaks which allow to solve various DNA topological problems ge-nerated during vital cellular proce sses such as replication, trans-cription, recombination, repair, chromatin assembly and chromo-some segregation.
    Quinoline
    Moiety
    Structure–activity relationship
    Citations (25)
    Four metabolites of mogrol were separated, identified and characterized. Their antitumor activity was evaluated, and the results showed side chain modification would probably enhance the cytotoxicity. Therefore, three types of amines, alcohols and rigid planar derivatives were synthesized. Compounds 20 and 21 containing a tetrahydro-β-carboline structure at the end of the side chain exhibited IC50 values around 2-9 μM against A549 and CNE1 cell comparing with 80-90 μM of mogrol. Structure analysis suggested that the perhydrocyclopentanophenanthrene moiety and the tetrahydro-β-carboline moiety could probably enhance the activity through an intramolecular synergistic effect.[Formula: see text].
    Moiety
    Side chain
    Structure–activity relationship