COMBRETASTATIN ANALOGS FOR USE IN THE TREATMENT OF CANCER
申请人:Schobert Rainer
公开号:US20130137740A1
公开(公告)日:2013-05-30
The present invention relates to specific analogs of combretastatin, in particular the compounds of formula (I) as described and defined herein, and pharmaceutical compositions comprising the compounds, as well as their medical use, in particular in the treatment or prevention of cancer, including multidrug-resistant cancer.
Combretastatin analogs for use in the treatment of cancer
申请人:Schobert Rainer
公开号:US08980933B2
公开(公告)日:2015-03-17
The present invention relates to specific analogs of combretastatin, in particular the compounds of formula (I) as described and defined herein, and pharmaceutical compositions comprising the compounds, as well as their medical use, in particular in the treatment or prevention of cancer, including multidrug-resistant cancer.
4-(3-Halo/amino-4,5-dimethoxyphenyl)-5-aryloxazoles and -<i>N</i>-methylimidazoles That Are Cytotoxic against Combretastatin A Resistant Tumor Cells and Vascular Disrupting in a Cisplatin Resistant Germ Cell Tumor Model
New combretastatin A analogues featuring oxazole or N-methylimidazole bridged Z-alkenes and haloor amino-substituted A-rings were tested against various cancer cell lines and in testicular germ cell tumor xenografts in mice. Imidazoles with 3-halo-4,5-dimethoxy substituted A-rings and 3-amino-4-methoxy substituted B-rings (7b and 8b) were efficacious at nanomolar concentrations against cells of combretastatin A refractory HT-29 colon carcinoma, multidrug-resistant MCF-7/Topo breast carcinoma, and cisplatin-resistant 1411 HP testicular germ cell tumor. They induced apoptosis and inhibited tubulin polymerization. While well tolerated by mice at high doses, these imidazoles initiated extensive intratumoral hemorrhage and regressions of highly vascularized 1411 HP xenografts.
Ru(η6-arene) complexes of combretastatin-analogous oxazoles with enhanced anti-tumoral impact
Oxazole-bridged combretastatin A-4 analogues bind to tubulin and exert anti-vascular and anti-angiogenic effects. When linked to Ru(eta(6)-arene) complex fragments, conjugates with additional cytotoxic activity result which can ruthenate bionucleophiles such as DNA and proteins. For instance, the Ru(11) (p-cymene)(isonicotinate)Cl-2 complex 6a of the known 4-(3,4,5-trimethoxyphenyl)-5-(3-hydroxy-4-methoxyphenyl)-oxazole 4a was far more active than the latter against cells of the p53-competent wild-type form of HCT-116 colon carcinoma at low 0.01 mu M concentrations. A fast reaction of 6a with nucleophilic N-acetyl-L-cysteine was observed in NMR studies. The Ru(arene) complexes 6a-c were also more efficacious against combretastatin-refractory p53(+) cells of human HT-29 colon carcinoma when compared to their parent 4-(3,4-dimethoxy-5-methoxy/halo-phenyl)-5-(3-hydroxy-4-methoxyphenyl)-oxazoles 4a-c. These cells are rich in ABC-transporters which are responsible for their multi-drug resistance and for which conjugates 6 are less good substrates than the phenols 4. Unlike 4a, its complex 6a also diminished the motility of human 518A2 melanoma cells in a wound-healing assay which is indicative of anti-metastatic activity in solid tumors. Overall, the Ru(arene) complex conjugates 6 broaden the anti-tumoral spectrum of the combretastatin A-4 analogues 4 considerably. (C) 2010 Elsevier Masson SAS. All rights reserved.