Substituted 3-(5-Imidazo[2,1-<i>b</i>]thiazolylmethylene)-2-indolinones and Analogues: Synthesis, Cytotoxic Activity, and Study of the Mechanism of Action
作者:Aldo Andreani、Massimiliano Granaiola、Alessandra Locatelli、Rita Morigi、Mirella Rambaldi、Lucilla Varoli、Natalia Calonghi、Concettina Cappadone、Giovanna Farruggia、Claudio Stefanelli、Lanfranco Masotti、Tam L. Nguyen、Ernest Hamel、Robert H. Shoemaker
DOI:10.1021/jm2012694
日期:2012.3.8
The synthesis of substituted 3-(5-imidazo[2,1-b]thiazolylmethylene)-2-indolinones and analogues is reported. Their cytotoxic activity was evaluated according to protocols available at the National Cancer Institute (NCI), Bethesda, MD. The action of selected compounds was examined for potential inhibition of tubulin assembly in comparison with the potent colchicine site agent combretastatin A-4. The most potent compounds also strongly and selectively inhibited the phosphorylation of the oncoprotein kinase Akt in cancer cells. The effect of the most interesting compounds was examined on the growth of HT-29 colon cancer cells. These compounds caused the cells to arrest in the G2/M phase of the cell cycle, as would be expected for inhibitors of tubulin assembly.
Antitumor Activity of New Substituted 3-(5-Imidazo[2,1-<i>b</i>]thiazolylmethylene)-2-indolinones and 3-(5-Imidazo[2,1-<i>b</i>]thiadiazolylmethylene)-2-indolinones: Selectivity against Colon Tumor Cells and Effect on Cell Cycle-Related Events
The synthesis of new 3-(5-imidazo[2,1-b]thiazolylmethylene)-2-indolinones and 3-(5-imidazo[2,1-b]thiadiazolylmethylene)-2-indolinones is reported. The antitumor activity was evaluated according to the protocols available at the National Cancer Institute (NCI), Bethesda, MD. To investigate the mechanism of action of the most potent antitumor agent of this series, its effect on growth of HT-29 colon carcinoma cells was studied. Its ability to inhibit cellular proliferation was mediated by cell cycle arrest at the G2/M phase, accompanied by inhibition of ornithine decarboxylase (ODC), the limiting enzyme of polyamine synthesis, and followed by induction of apoptosis.