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• W2022631908 abstract "An antitumor drug N-[2-(dimethylamino)ethyl]acridine-4-carboxamide (DACA) and its three close structural analogs N-[2-(hydroxyethylamino)ethyl]acridine-4-carboxamide (DACAH), N-[2-(dimethylamino)ethyl]-9-aminoacridine-4-carboxamide (amino-DACA), and N-[2-(hydroxyethylamino)ethyl]-9-aminoacridine-4-carboxamide (amino-DACAH) were studied for their ability to inhibit RNA synthesis in vitro and to form topoisomerase II-mediated DNA lesions in relation to cell-killing activity. All tested compounds induced chromatin lesions characteristic of topoisomerase II-blocking drugs (DNA breaks and DNA-protein cross-links) in treated cells, but were much less active than reference antileukemic acridine m-AMSA (4'-(9-acridinylamino)-methanesulfon-m-anisidide). The ability to form these lesions was dependent on the structure of the 4-carboxamide side-chain, which seems to be an important factor affecting the drug transport rate through cell membrane. A 4-carboxamide chain with an N-2-(dimethylamino)ethyl moiety resulted in more efficient transport through cell membranes, higher cytotoxicity, and DNA-damaging activity. The mode of action of acridine-4-carboxamides was further elucidated by their incubation with cells in the presence of antitopoisomerase II agents of a known mechanism of inhibition. These were: bisdioxopiperazine (ICRF-187), a catalytic inhibitor of topoisomerase II, and etoposide (VP-16), an inducer of a cleavable complex of the enzyme with DNA. The cytotoxicity of DACA and its analogs was not antagonized by preincubating cells with ICRF-187. All tested acridines protected cells against DNA breakage induced by VP-16, but the extent of protection varied significantly. Amino-DACA, which easily penetrates cell membrane, fully inhibited DNA break formation, whereas other analogs exhibited a low degree of protection when used at high concentration. Our results suggest that the acridine-4-carboxamides discussed here are poor topoisomerase II poisons and that this enzyme is not their main target." @default.
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• W2022631908 date "1998-08-01" @default.
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• W2022631908 title "Cytotoxic and DNA-Damaging Properties of N-[2-(Dimethylamino)ethyl]acridine-4-Carboxamide (DACA) and Its Analogues" @default.
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• W2022631908 doi "https://doi.org/10.1016/s0006-2952(98)00030-6" @default.
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