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Bioorg Med Chem Lett ; 27(23): 5267-5271, 2017 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-29102228


Macrocyclic pyrrolobenzodiazepine dimers were designed and evaluated for use as antibody-drug conjugate payloads. Initial structure-activity exploration established that macrocyclization could increase the potency of PBD dimers compared with non-macrocyclic analogs. Further optimization overcame activity-limiting solubility issues, leading to compounds with highly potent (picomolar) activity against several cancer cell lines. High levels of in vitro potency and specificity were demonstrated with an anti-mesothelin conjugate.

Anticorpos/metabolismo , Antineoplásicos/farmacologia , Benzodiazepinas/farmacologia , Compostos Macrocíclicos/farmacologia , Pirróis/farmacologia , Anticorpos/química , Antineoplásicos/síntese química , Antineoplásicos/química , Benzodiazepinas/síntese química , Benzodiazepinas/química , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Dimerização , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Compostos Macrocíclicos/síntese química , Compostos Macrocíclicos/química , Estrutura Molecular , Pirróis/síntese química , Pirróis/química , Solubilidade , Relação Estrutura-Atividade
ACS Med Chem Lett ; 6(7): 770-5, 2015 Jul 09.
Artigo em Inglês | MEDLINE | ID: mdl-26191364


A series of dimeric macrocyclic compounds were prepared and evaluated as antagonists for inhibitor of apoptosis proteins. The most potent analogue 11, which binds to XIAP and c-IAP proteins with high affinity and induces caspase-3 activation and ultimately cell apoptosis, inhibits growth of human melanoma and colorectal cell lines at low nanomolar concentrations. Furthermore, compound 11 demonstrated significant antitumor activity in the A875 human melanoma xenograft model at doses as low as 2 mg/kg on a q3d schedule.

J Med Chem ; 58(3): 1556-62, 2015 Feb 12.
Artigo em Inglês | MEDLINE | ID: mdl-25584393


The prominent role of IAPs in controlling cell death and their overexpression in a variety of cancers has prompted the development of IAP antagonists as potential antitumor therapies. We describe the identification of a series of heterodimeric antagonists with highly potent antiproliferative activities in cIAP- and XIAP-dependent cell lines. Compounds 15 and 17 further demonstrate curative efficacy in human melanoma and lung cancer xenograft models and are promising candidates for advanced studies.

Antineoplásicos/farmacologia , Descoberta de Drogas , Proteínas Inibidoras de Apoptose/antagonistas & inibidores , Neoplasias Experimentais/tratamento farmacológico , Prolina/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/química , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Camundongos , Estrutura Molecular , Neoplasias Experimentais/patologia , Prolina/síntese química , Prolina/química , Relação Estrutura-Atividade
Drug Metab Dispos ; 36(12): 2475-83, 2008 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18787055


5-Isopropyl-6-(5-methyl-1,3,4-oxadiazol-2-yl)-N-(2-methyl-1H-pyrrolo[2,3-b]pyridin-5-yl)pyrrolo[2,1-f][1,2,4]triazin-4-amine (BMS-645737) is a potent and selective vascular endothelial growth factor receptor-2 antagonist. In this study, liquid chromatography/tandem mass spectrometry and NMR were used to investigate the biotransformation of BMS-645737 in vitro and in the cynomolgus monkey, dog, mouse, and rat. Metabolic pathways for BMS-645737 included multistep processes involving both oxidation and conjugation reactions. For example, the 2-methyl-1H-pyrrolo moiety underwent cytochrome P450-catalyzed hydroxylation followed by oxidation to a carboxylic acid and then conjugation with taurine. Alternatively, the 5-methyl-1,3,4-oxadiazol-2-yl moiety was metabolized by hydroxylation and then conjugation with sulfate. The pyridin-5-yl group underwent direct glucuronidation in hepatocytes (dog, monkey, human) and conjugation with N-acetylglucosamine in the monkey. Conjugation with glutathione and processing along the mercapturic acid pathway was a minor metabolic pathway in vivo, although BMS-645737 did not form conjugates in the presence of glutathione-supplemented liver microsomes. Other minor biotransformation pathways included oxidative dehydrogenation, dihydroxylation, and hydrolytic opening of the oxadiazole ring followed by either deacetylation or hydrolysis of the resulting diacyl hydrazide. Whereas previous studies have shown the formation of N-acetylglucosamine conjugates of alcohols, arylamines, and other small molecules, this report describes the biotransformation of a heterocyclic aromatic amine via direct conjugation with N-acetylglucosamine.

Acetilglucosamina/metabolismo , Pirróis/metabolismo , Triazinas/metabolismo , Animais , Bile/metabolismo , Biotransformação , Sistema Enzimático do Citocromo P-450/genética , Sistema Enzimático do Citocromo P-450/metabolismo , Cães , Glicosilação , Hepatócitos/metabolismo , Humanos , Hidroxilação , Macaca fascicularis , Espectroscopia de Ressonância Magnética , Redes e Vias Metabólicas , Camundongos , Camundongos Endogâmicos , Microssomos Hepáticos/metabolismo , Estrutura Molecular , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/metabolismo , Inibidores de Proteínas Quinases/farmacocinética , Pirróis/química , Pirróis/farmacocinética , Ratos , Ratos Sprague-Dawley , Proteínas Recombinantes/metabolismo , Espectrometria de Massas em Tandem , Triazinas/química , Triazinas/farmacocinética , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores
Bioorg Med Chem Lett ; 15(2): 271-6, 2005 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-15603938


A novel series of isoindoledione based compounds were identified as potent antagonists of the androgen receptor (AR). Co-crystallization of members of this family of inhibitors was successfully accomplished with the T877A AR LBD. A working model of how this class of compounds functions to antagonize the AR was created. Based on this model, it was proposed that expanding the bicyclic portion of the molecule should result in analogs which function as effective antagonists against a variety of AR isoforms. In contrast to what was predicted by the model, SAR around this new series was dictated by the aniline portion rather than the bicyclic portion of the molecule.

Antagonistas de Androgênios/síntese química , Indóis/química , Antagonistas de Androgênios/farmacologia , Compostos Bicíclicos Heterocíclicos com Pontes/síntese química , Compostos Bicíclicos Heterocíclicos com Pontes/farmacologia , Indóis/farmacologia , Isoformas de Proteínas , Receptores Androgênicos/metabolismo , Relação Estrutura-Atividade , Células Tumorais Cultivadas
Bioorg Med Chem Lett ; 15(2): 389-93, 2005 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-15603960


A novel series of isoindoledione based compounds were identified as potent antagonists of the androgen receptor (AR). SAR around this series revealed dramatic differences in binding and function in mutant variants (MT) of the AR as compared to the wild type (WT) receptor. Optimization of the aniline portion revealed substitution patterns, which yielded potent antagonist activity against the WT AR as well as the MT AR found in the LNCaP and PCa2b human prostate tumor cell lines.

Antagonistas de Androgênios/farmacologia , Antagonistas de Receptores de Andrógenos , Compostos Bicíclicos Heterocíclicos com Pontes/química , Indóis/química , Animais , Humanos , Concentração Inibidora 50 , Masculino , Mutação , Neoplasias da Próstata/metabolismo , Receptores Androgênicos/metabolismo , Relação Estrutura-Atividade , Células Tumorais Cultivadas