RESUMO
We describe the structural optimization of a lead compound 1 that exhibits dual inhibitory activities against FLT3 and CDK4. A series of pyrido[4',3':4,5]pyrrolo[2,3-d]pyrimidine derivatives was synthesized, and SAR analysis, using cell-based assays, led to the discovery of 28 (AMG 925), a potent and orally bioavailable dual inhibitor of CDK4 and FLT3, including many FLT3 mutants reported to date. Compound 28 inhibits the proliferation of a panel of human tumor cell lines including Colo205 (Rb(+)) and U937 (FLT3(WT)) and induced cell death in MOLM13 (FLT3(ITD)) and even in MOLM13 (FLT3(ITD, D835Y)), which exhibits resistance to a number of FLT3 inhibitors currently under clinical development. At well-tolerated doses, compound 28 leads to significant growth inhibition of MOLM13 xenografts in nude mice, and the activity correlates with inhibition of STAT5 and Rb phosphorylation.
Assuntos
Quinase 4 Dependente de Ciclina/antagonistas & inibidores , Compostos Heterocíclicos com 3 Anéis/síntese química , Naftiridinas/síntese química , Inibidores de Proteínas Quinases/síntese química , Tirosina Quinase 3 Semelhante a fms/antagonistas & inibidores , Animais , Quinase 6 Dependente de Ciclina/antagonistas & inibidores , Citocromo P-450 CYP3A , Inibidores do Citocromo P-450 CYP3A , Cães , Descoberta de Drogas , Compostos Heterocíclicos com 3 Anéis/farmacologia , Humanos , Macaca fascicularis , Naftiridinas/farmacologia , Inibidores de Proteínas Quinases/farmacocinética , Inibidores de Proteínas Quinases/farmacologia , Ratos , Relação Estrutura-Atividade , Células U937 , Tirosina Quinase 3 Semelhante a fms/genéticaRESUMO
A series of urea based calcimimetics was optimized for potency and oral bioavailability. Crucial to this process was overcoming the poor pharmacokinetic properties of lead thiazole 1. Metabolism-guided modifications, characterized by the use of metabolite identification (ID) and measurement of time dependent inhibition (TDI) of CYP3A4, were essential to finding a compound suitable for oral dosing. Calcimimetic 18 exhibited excellent in vivo potency in a 5/6 nephrectomized rat model and cross-species pharmacokinetics.
Assuntos
Hiperparatireoidismo Secundário/tratamento farmacológico , Tiazóis/química , Tiazóis/uso terapêutico , Ureia/análogos & derivados , Administração Oral , Animais , Disponibilidade Biológica , Meia-Vida , Hiperparatireoidismo Secundário/metabolismo , Hiperparatireoidismo Secundário/patologia , Masculino , Hormônio Paratireóideo/metabolismo , Ligação Proteica , Ratos , Ratos Sprague-Dawley , Receptores de Detecção de Cálcio/química , Receptores de Detecção de Cálcio/metabolismo , Tiazóis/farmacocinéticaRESUMO
A series of thiadiazolopiperazinyl aryl urea fatty acid amide hydrolase (FAAH) inhibitors is described. The molecules were found to inhibit the enzyme by acting as mechanism-based substrates, forming a covalent bond with Ser241. SAR and PK properties are presented.
