Abstract:
:The anthraquinone scaffold has long been known as a source of efficacious antitumor drugs. In particular, the various chemical modifications of the side chains in this scaffold have yielded the compounds potent for the wild type tumor cells, their counterparts with molecular determinants of altered drug response, as well as in vivo settings. Further exploring the chemotype of anticancer heteroarene-fused anthraquinones, we herein demonstrate that derivative of anthra[2,3-b]thiophene-2-carboxamide, (compound 8) is highly potent against a panel of human tumor cell lines and their drug resistant variants. Treatment with submicromolar or low micromolar concentrations of 8 for only 30 min was sufficient to trigger lethal damage of K562 chronic myelogenous leukemia cells. Compound 8 (2.5 μM, 3-6 h) induced an apoptotic cell death as determined by concomitant activation of caspases 3 and 9, cleavage of poly(ADP-ribose) polymerase, increase of Annexin V/propidium iodide double stained cells, DNA fragmentation (subG1 fraction) and a decrease of mitochondrial membrane potential. Neither a significant interaction with double stranded DNA nor strong inhibition of the DNA dependent enzyme topoisomerase 1 by 8 were detectable in cell free systems. Laser scanning confocal microscopy revealed that some amount of 8 was detectable in mitochondria as early as 5 min after the addition to the cells; exposure for 1 h caused significant morphological changes and clustering of mitochondria. The bioisosteric analog 2 in which the thiophene ring was replaced with furan was less active although the patterns of cytotoxicity of both derivatives were similar. These results point at the specific role of the sulfur atom in the antitumor properties of carboxamide derivatives of heteroarene-fused anthraquinone.
journal_name
Eur J Med Chemjournal_title
European journal of medicinal chemistryauthors
Volodina YL,Tikhomirov AS,Dezhenkova LG,Ramonova AA,Kononova AV,Andreeva DV,Kaluzhny DN,Schols D,Moisenovich MM,Shchekotikhin AE,Shtil AAdoi
10.1016/j.ejmech.2021.113521keywords:
["Anthraquinone","Antiproliferative activity","Bioisostere","Carboxamide","Cell cycle","Cell death","Intracellular targets","Structure-activity relationship","Thiophene"]subject
Has Abstractpub_date
2021-10-05 00:00:00pages
113521eissn
0223-5234issn
1768-3254pii
S0223-5234(21)00370-6journal_volume
221pub_type
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