Anticancer Activity and Topoisomerase II Inhibition of Naphthalimides with ω-Hydroxylalkylamine Side-Chains of Different Lengths

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Author(s): Mateusz D. Tomczyk, Anna Byczek Wyrostek, Klaudia Strama, Martyna Wawszków, Przemysław Kasprzycki, Krzysztof Z. Walczak*.

Journal Name: Medicinal Chemistry

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Background: The substituted 1,8-Naphthalimides (1H-benzo[de]isoquinoline-1,3(2H)- diones) are known as DNA intercalators stabilizing DNA-Topoisomerase II complexes. This interaction disrupts the cleavage-relegation equilibrium of Topo II, resulting in formation of broken strands of DNA.

Objective: To study the influence of type of substituent and substitution position in 1,8- naphthalimde skeleton on inhibition of Topoisomerase II activity.

Method: The starting 1,8-naphthalimide was prepared from acenaphthene by introduction of appropriate substituents followed by condensation with ω-hydroxylakylamines of different chain length. The substituent were introduced to 1,8-naphthalimide molecule by nucleophilic substitution of leaving groups like nitro or bromo present in 4 or 4,5- position using the ω- hydroxylalkylamines. The bioactivity of obtained compounds was examined in model cell lines.

Results: Antiproliferative activities of selected compounds against HCT 116 human colon cancer cells, human non-small cell lung cells A549 and non-tumorigenic BEAS-2B human bronchial epithelium cells was examined. Several of investigated compounds exhibit a significant activity (IC50 μM to 7 μM) against model tumour lines. It was demonstrated that upon treatment with concentration of 200 μM, all derivatives display Topo II inhibitory activity, which may be compared with activity of Amonafide.

Conclusion: The replacement of the nitro groups in the chromophore slightly reduces its anticancer activities, whereas the presence of both nitro group and ω-hydroxylalkylamine chain resulted in seriously increased anticancer activities. Obtained compounds showed Topo II inhibitory activity, moreover, influence of the substitution pattern on the ability to inhibit Topo II activity and cancer cells proliferation was observed.

Keywords: Naphthalimide, Amonafide, Mitonafide, Anticancer, Topoisomerase II, DNA intercalator

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(E-pub Ahead of Print)
DOI: 10.2174/1573406414666180912105851
Price: $95

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