RESUMO
The propensity for cancer cells to accumulate additional centrosomes relative to normal cells could be exploited for therapeutic benefit in oncology. Following literature reports that suggested TNKS1 (tankyrase 1) and PARP16 may be involved with spindle structure and function and may play a role in suppressing multi-polar spindle formation in cells with supernumerary centrosomes, we initiated a phenotypic screen to look for small molecule poly (ADP-ribose) polymerase (PARP) enzyme family inhibitors that could produce a multi-polar spindle phenotype via declustering of centrosomes. Screening of AstraZeneca's collection of phthalazinone PARP inhibitors in HeLa cells using high-content screening techniques identified several compounds that produced a multi-polar spindle phenotype at low nanomolar concentrations. Characterization of these compounds across a broad panel of PARP family enzyme assays indicated that they had activity against several PARP family enzymes, including PARP1, 2, 3, 5a, 5b, and 6. Further optimization of these initial hits for improved declustering potency, solubility, permeability, and oral bioavailability resulted in AZ0108, a PARP1, 2, 6 inhibitor that potently inhibits centrosome clustering and is suitable for in vivo efficacy and tolerability studies.
Assuntos
Centrossomo/metabolismo , Ftalazinas/química , Inibidores de Poli(ADP-Ribose) Polimerases/química , Administração Oral , Animais , Sítios de Ligação , Células CACO-2 , Centrossomo/efeitos dos fármacos , Cristalografia por Raios X , Avaliação Pré-Clínica de Medicamentos , Células HeLa , Humanos , Microssomos/metabolismo , Conformação Molecular , Simulação de Dinâmica Molecular , Ftalazinas/administração & dosagem , Ftalazinas/farmacologia , Inibidores de Poli(ADP-Ribose) Polimerases/administração & dosagem , Inibidores de Poli(ADP-Ribose) Polimerases/farmacologia , Estrutura Terciária de Proteína , Ratos , Tanquirases/antagonistas & inibidores , Tanquirases/metabolismoRESUMO
The canonical Wnt pathway plays an important role in embryonic development, adult tissue homeostasis, and cancer. Germline mutations of several Wnt pathway components, such as Axin, APC, and ß-catenin, can lead to oncogenesis. Inhibition of the poly(ADP-ribose) polymerase (PARP) catalytic domain of the tankyrases (TNKS1 and TNKS2) is known to inhibit the Wnt pathway via increased stabilization of Axin. In order to explore the consequences of tankyrase and Wnt pathway inhibition in preclinical models of cancer and its impact on normal tissue, we sought a small molecule inhibitor of TNKS1/2 with suitable physicochemical properties and pharmacokinetics for hypothesis testing in vivo. Starting from a 2-phenyl quinazolinone hit (compound 1), we discovered the pyrrolopyrimidinone compound 25 (AZ6102), which is a potent TNKS1/2 inhibitor that has 100-fold selectivity against other PARP family enzymes and shows 5 nM Wnt pathway inhibition in DLD-1 cells. Moreover, compound 25 can be formulated well in a clinically relevant intravenous solution at 20 mg/mL, has demonstrated good pharmacokinetics in preclinical species, and shows low Caco2 efflux to avoid possible tumor resistance mechanisms.
RESUMO
Structure based design, synthesis, and biological evaluation of a novel series of 1-methyl-1H-imidazole, as potent Jak2 inhibitors to modulate the Jak/STAT pathway, are described. Using the C-ring fragment from our first clinical candidate AZD1480 (24), optimization of the series led to the discovery of compound 19a, a potent, orally bioavailable Jak2 inhibitor. Compound 19a displayed a high level of cellular activity in hematopoietic cell lines harboring the V617F mutation and in murine BaF3 TEL-Jak2 cells. Compound 19a demonstrated significant tumor growth inhibition in a UKE-1 xenograft model within a well-tolerated dose range.
Assuntos
Antineoplásicos/síntese química , Imidazóis/síntese química , Janus Quinase 2/antagonistas & inibidores , Inibidores de Proteínas Quinases/síntese química , Animais , Antineoplásicos/farmacologia , Cães , Descoberta de Drogas , Humanos , Imidazóis/farmacologia , Camundongos , Inibidores de Proteínas Quinases/farmacologia , Ratos , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Checkpoint kinases CHK1 and CHK2 are activated in response to DNA damage that results in cell cycle arrest, allowing sufficient time for DNA repair. Agents that lead to abrogation of such checkpoints have potential to increase the efficacy of such compounds as chemo- and radiotherapies. Thiophenecarboxamide ureas (TCUs) were identified as inhibitors of CHK1 by high throughput screening. A structure-based approach is described using crystal structures of JNK1 and CHK1 in complex with 1 and 2 and of the CHK1-3b complex. The ribose binding pocket of CHK1 was targeted to generate inhibitors with excellent cellular potency and selectivity over CDK1and IKKß, key features lacking from the initial compounds. Optimization of 3b resulted in the identification of a regioisomeric 3-TCU lead 12a. Optimization of 12a led to the discovery of the clinical candidate 4 (AZD7762), which strongly potentiates the efficacy of a variety of DNA-damaging agents in preclinical models.
Assuntos
Antineoplásicos/síntese química , Inibidores de Proteínas Quinases/síntese química , Proteínas Quinases/metabolismo , Tiofenos/síntese química , Ureia/análogos & derivados , Animais , Antineoplásicos/química , Antineoplásicos/farmacologia , Sítios de Ligação , Camptotecina/análogos & derivados , Camptotecina/farmacologia , Quinase 1 do Ponto de Checagem , Cristalografia por Raios X , Dano ao DNA , Desoxicitidina/análogos & derivados , Desoxicitidina/farmacologia , Desenho de Fármacos , Sinergismo Farmacológico , Ensaios de Triagem em Larga Escala , Irinotecano , Camundongos , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Quinases/química , Ratos , Estereoisomerismo , Relação Estrutura-Atividade , Tiofenos/química , Tiofenos/farmacologia , Ureia/síntese química , Ureia/química , Ureia/farmacologia , Ensaios Antitumorais Modelo de Xenoenxerto , GencitabinaRESUMO
Synthesis and biological evaluation of a series of 6-aminopyrazolyl-pyridine-3-carbonitriles as JAK2 kinase inhibitors was reported. Biochemical screening, followed by profile optimization, resulted in JAK2 inhibitors exhibiting good kinase selectivity, pharmacokinetic properties, physical properties and pharmacodynamic effects.
Assuntos
Janus Quinase 2/antagonistas & inibidores , Nitrilas/síntese química , Nitrilas/farmacologia , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Pirazóis/química , Piridinas/química , Animais , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Concentração Inibidora 50 , Camundongos , Estrutura Molecular , Nitrilas/química , Nitrilas/farmacocinética , Inibidores de Proteínas Quinases/farmacocinética , Ratos , Relação Estrutura-AtividadeRESUMO
The myeloproliferative neoplasms, polycythemia vera, essential thrombocythemia, and idiopathic myelofibrosis are a heterogeneous but related group of hematological malignancies characterized by clonal expansion of one or more myeloid lineages. The discovery of the Jak2 V617F gain of function mutation highlighted Jak2 as a potential therapeutic target in the MPNs. Herein, we disclose the discovery of a series of pyrazol-3-yl pyrimidin-4-amines and the identification of 9e (AZD1480) as a potent Jak2 inhibitor. 9e inhibits signaling and proliferation of Jak2 V617F cell lines in vitro, demonstrates in vivo efficacy in a TEL-Jak2 model, has excellent physical properties and preclinical pharmacokinetics, and is currently being evaluated in Phase I clinical trials.
Assuntos
Janus Quinase 2/antagonistas & inibidores , Pirazóis/síntese química , Pirimidinas/síntese química , Fatores de Transcrição STAT/fisiologia , Animais , Linhagem Celular Tumoral , Cristalografia por Raios X , Cães , Feminino , Humanos , Técnicas In Vitro , Janus Quinase 2/química , Camundongos , Camundongos Nus , Microssomos Hepáticos/metabolismo , Modelos Moleculares , Fosforilação , Conformação Proteica , Pirazóis/farmacocinética , Pirazóis/farmacologia , Pirimidinas/farmacocinética , Pirimidinas/farmacologia , Ratos , Fatores de Transcrição STAT/metabolismo , Fator de Transcrição STAT3/metabolismo , Fator de Transcrição STAT5/metabolismo , Transdução de Sinais , Estereoisomerismo , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Thiazol-2-yl amine was identified as an isosteric replacement for pyrazol-3-yl amine during our efforts to identify potent and selective JAK2 inhibitors. The rationale, synthesis and biological evaluation of several analogs is reported, along with the in vivo evaluation of the lead compounds.
Assuntos
Aminas/síntese química , Antineoplásicos/síntese química , Janus Quinase 2/antagonistas & inibidores , Inibidores de Proteínas Quinases/síntese química , Pirazóis/química , Tiazóis/química , Aminas/química , Aminas/farmacocinética , Animais , Antineoplásicos/química , Antineoplásicos/farmacocinética , Linhagem Celular Tumoral , Descoberta de Drogas , Canal de Potássio ERG1 , Canais de Potássio Éter-A-Go-Go/metabolismo , Humanos , Janus Quinase 2/metabolismo , Camundongos , Camundongos Nus , Microssomos/metabolismo , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacocinética , Inibidores de Proteínas Quinases/farmacologia , Ratos , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
The design, synthesis and biological evaluation of a series of pyrazol-3-ylamino pyrazines as potent and selective JAK2 kinase inhibitors is reported, along with the pharmacokinetic and pharmacodynamic properties of lead compounds.
Assuntos
Descoberta de Drogas , Janus Quinase 2/antagonistas & inibidores , Inibidores de Proteínas Quinases/farmacologia , Pirazinas/farmacologia , Pirazóis/farmacologia , Animais , Cães , Humanos , Camundongos , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Pirazinas/síntese química , Pirazinas/química , Pirazóis/síntese química , Pirazóis/química , Ratos , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
Checkpoint kinase-1 (Chk1, CHEK1) is a Ser/Thr protein kinase that mediates the cellular response to DNA-damage. A novel class of 2-ureido thiophene carboxamide urea (TCU) Chk1 inhibitors is described. Inhibitors in this chemotype were optimized for cellular potency and selectivity over Cdk1.