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The cytotoxic potential of cationc triangulenes against tumour cells

Reynisson

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Abstract

TOTA (trioxatriangulenium ion) is a close-shelled carbocation known to intercalate strongly with the DNA double helix (J. Reynisson, G. B. Schuster, S. B. Howerton, L. D. Williams, R. N. Barnett, C. L. Cleveland, U. Landman, N. Harrit, J. B. Chaires, J. Am. Chem. Soc. 2003, 125, 2072). The cytotoxicity of TOTA and its four close structural analogues, ADOTA, Pr-ADOTA, Pr-DAOTA and n-Butyl-TATA were tested against the breast cancer cell line MDA-MB-231 and colon cancer cell line HCT116. The most potent derivatives Pr-ADOTA and Pr-DAOTA had IC50 values of ~80 nM for MDA-MB-231 but slightly higher for HCT116 in the low hundreds nM range. A 3D model assay of HCT116 spheroids was also used, mimicking a tumour environment, again both Pr-ADOTA and Pr-DAOTA were very active with IC50 values of 38 nM and 21 nM, respectively. Molecular modelling suggest that the planar derivatives intercalate between the base pairs of the DNA double helix. However, only modest DNA double stranded DNA cleavage was observed using the ?H2AX assay as compared to camptothecin, a topoisomerase I poison suggesting a different mechanism. Finally, a robust density functional theory (DFT) model was built to predict the pKR+ stability values, i.e., to design derivatives, which predominantly have a non-intercalating buckled form in healthy tissues followed by a nucleophilic attach of water on the central carbon, but a planar form at relatively low pH values rendering them only cytotoxic in the interior of tumours.

Citation

Reynisson. (2019). The cytotoxic potential of cationc triangulenes against tumour cells. MedChemComm, 1881-1891. https://doi.org/10.1039/C9MD00305C

Acceptance Date Aug 19, 2019
Publication Date Nov 1, 2019
Journal MedChemComm
Print ISSN 2040-2503
Publisher Royal Society of Chemistry
Pages 1881-1891
DOI https://doi.org/10.1039/C9MD00305C
Keywords tumour cells
Publisher URL https://pubs.rsc.org/en/content/articlehtml/2019/md/c9md00305c

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