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
                                
                                    
                                        作者:Aldo Andreani、Silvia Burnelli、Massimiliano Granaiola、Alberto Leoni、Alessandra Locatelli、Rita Morigi、Mirella Rambaldi、Lucilla Varoli、Natalia Calonghi、Concettina Cappadone、Manuela Voltattorni、Maddalena Zini、Claudio Stefanelli、Lanfranco Masotti、Robert H. Shoemaker                                    
                                    
                                        DOI:10.1021/jm800827q
                                    
                                    
                                        日期:2008.12.11
                                    
                                    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.