Combretastatin analogs of the antitumor agent tubuloclustin {N-[7-(adamant-2-yloxy)-7-oxoheptanoyl]-Ndeacetylcolchicine} were prepared via esterification of combretastatin by monoesters of pimelic or adipic acid with adamantan-2-ol or (adamantan-1-yl)methanol. These conjugates were stable and cytotoxic to human lung carcinoma A549 cells (EC50 ≈ 50 – 70 nM) and caused depolymerization of microtubules and slight clustering of tubulin. Tubuloclustin analogs with shortened linkers were prepared via amidation by N-deacetylcolchicine of monoesters of adipic or succinic acids with adamantan-1-ol or (adamantan-1-yl)methanol. The conjugate N-[6-(adamantyl)-6-oxohexanoyl]-N-deacetylcolchicine was more active (EC50 ≈ 4 nM) than tubuloclustin and promoted strong tubulin clusterization. All compounds induced apoptosis of A549 cells. Tests in vivo of N-[6-(adamantyl)-6-oxoheaxnoyl]-N-deacetylcolchicine on carcinoma A549 experimental models were concluded to be promising.
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Acknowledgments
The work was financially supported by RFBR Grant 18–33–01121 mol a. We thank German Academic Exchange Service DAAD for supporting an academic exchange under terms of a collaboration agreement between Moscow and Rostock Universities.
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Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 53, No. 5, pp. 13 – 19, May, 2019.
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Zefirov, N.A., Evteeva, Y.A., Fatkulin, A.R. et al. Synthesis, Antiproliferative Activity, and Effect on Carcinoma A549 Cell Microtubules of New Tubuloclustin Analogs. Pharm Chem J 53, 423–428 (2019). https://doi.org/10.1007/s11094-019-02014-y
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DOI: https://doi.org/10.1007/s11094-019-02014-y