RESUMO
B3GNT2 is responsible for elongation of cell surface long-chain polylactosamine, which influences the regulation of the immune response, making it an attractive target for immunomodulation. In the development of amide containing B3GNT2 inhibitors guided by structure-based drug design, imidazolones were found to successfully serve as amide bioisosteres. This novel imidazolone isosteric strategy alleviated torsional strain of the amide bond on binding to B3GNT2 and improved potency, isoform selectivity, as well as certain physicochemical and pharmacokinetic properties. Herein, we present the synthesis, SAR, X-ray cocrystal structures, and in vivo PK properties of imidazol-4-ones in the context of B3GNT2 inhibition.
Assuntos
Amidas , N-Acetilglucosaminiltransferases , Amidas/farmacologia , Amidas/química , N-Acetilglucosaminiltransferases/metabolismo , Desenho de Fármacos , Relação Estrutura-AtividadeRESUMO
Agonism of the endothelial receptor APJ (putative receptor protein related to AT1; AT1: angiotensin II receptor type 1) has the potential to ameliorate congestive heart failure by increasing cardiac output without inducing hypertrophy. Although the endogenous agonist, pyr-apelin-13 (1), has shown beneficial APJ-mediated inotropic effects in rats and humans, such effects are short-lived given its extremely short half-life. Here, we report the conjugation of 1 to a fatty acid, providing a lipidated peptide (2) with increased stability that retains inotropic activity in an anesthetized rat myocardial infarction (MI) model. We also report the preparation of a library of 15-mer APJ agonist peptide-lipid conjugates, including adipoyl-γGlu-OEG-OEG-hArg-r-Q-hArg-P-r-NMeLeuSHK-G-Oic-pIPhe-P-DBip-OH (17), a potent APJ agonist with high plasma protein binding and a half-life suitable for once-daily subcutaneous dosing in rats. A correlation between subcutaneous absorption rate and lipid length/type of these conjugates is also reported.
Assuntos
Receptores de Apelina/agonistas , Lipídeos/farmacologia , Infarto do Miocárdio/tratamento farmacológico , Peptídeos/farmacologia , Animais , Receptores de Apelina/metabolismo , Relação Dose-Resposta a Droga , Injeções Intravenosas , Lipídeos/administração & dosagem , Lipídeos/química , Estrutura Molecular , Infarto do Miocárdio/metabolismo , Peptídeos/administração & dosagem , Peptídeos/química , Ratos , Relação Estrutura-AtividadeRESUMO
KRASG12C has emerged as a promising target in the treatment of solid tumors. Covalent inhibitors targeting the mutant cysteine-12 residue have been shown to disrupt signaling by this long-"undruggable" target; however clinically viable inhibitors have yet to be identified. Here, we report efforts to exploit a cryptic pocket (H95/Y96/Q99) we identified in KRASG12C to identify inhibitors suitable for clinical development. Structure-based design efforts leading to the identification of a novel quinazolinone scaffold are described, along with optimization efforts that overcame a configurational stability issue arising from restricted rotation about an axially chiral biaryl bond. Biopharmaceutical optimization of the resulting leads culminated in the identification of AMG 510, a highly potent, selective, and well-tolerated KRASG12C inhibitor currently in phase I clinical trials (NCT03600883).
Assuntos
Antineoplásicos/uso terapêutico , Neoplasias/tratamento farmacológico , Piperazinas/uso terapêutico , Proteínas Proto-Oncogênicas p21(ras)/antagonistas & inibidores , Piridinas/uso terapêutico , Pirimidinas/uso terapêutico , Pirimidinonas/uso terapêutico , Animais , Antineoplásicos/química , Antineoplásicos/farmacocinética , Ensaios Clínicos como Assunto , Cães , Descoberta de Drogas , Humanos , Isomerismo , Células Madin Darby de Rim Canino , Camundongos Endogâmicos BALB C , Camundongos Nus , Mutação , Piperazinas/química , Piperazinas/farmacologia , Proteínas Proto-Oncogênicas p21(ras)/genética , Piridinas/química , Piridinas/farmacocinética , Piridinas/farmacologia , Pirimidinas/química , Pirimidinas/farmacologia , Pirimidinonas/química , Pirimidinonas/farmacocinética , Ratos , Relação Estrutura-AtividadeRESUMO
Fucosylation is a biological process broadly observed in vertebrates, invertebrates, plants, bacteria, and fungi. Fucose moieties on cell-surface glycans are increasingly recognized as critical to many cell-cell interaction and signaling processes. One of the characteristic roles of fucose is its regulation of selectin-dependent leukocyte adhesion that has been well studied over the last two decades. Recent studies of fucose in immune cell development and function regulation have significantly expanded the contemporary understanding of fucosylation. From cellular adhesion to immune regulation, herein we discuss the use of gene knockout studies, competitive inhibitors of fucose-containing glycan, and metabolic inhibitors of fucose biosynthesis to probe fucosylated glycan biosynthesis and signaling and its functional consequences. Promising clinical and preclinical applications in sickle cell disease, rheumatoid arthritis, tumor inhibition, metastasis prevention, antibody-dependent cell-mediated cytotoxicity, chemoresistance reversal, and in improving chemotherapy-related side effects and recovery are reviewed.
Assuntos
Adesão Celular , Fucose/imunologia , Imunidade Celular , Imunidade Inata , Anemia Falciforme/imunologia , Anemia Falciforme/metabolismo , Anemia Falciforme/patologia , Animais , Artrite Reumatoide/imunologia , Artrite Reumatoide/metabolismo , Artrite Reumatoide/patologia , Fucose/análise , Fucose/metabolismo , Glicosilação , Humanos , Macrófagos/imunologia , Macrófagos/metabolismo , Macrófagos/patologia , Neoplasias/imunologia , Neoplasias/metabolismo , Neoplasias/patologia , Polissacarídeos/química , Polissacarídeos/imunologia , Polissacarídeos/metabolismo , Selectinas/imunologia , Selectinas/metabolismoRESUMO
The efficacy of therapeutic antibodies that induce antibody-dependent cellular cytotoxicity can be improved by reduced fucosylation. Consequently, fucosylation is a critical product attribute of monoclonal antibodies produced as protein therapeutics. Small molecule fucosylation inhibitors have also shown promise as potential therapeutics in animal models of tumors, arthritis, and sickle cell disease. Potent small molecule metabolic inhibitors of cellular protein fucosylation, 6,6,6-trifluorofucose per-O-acetate and 6,6,6-trifluorofucose (fucostatin I), were identified that reduces the fucosylation of recombinantly expressed antibodies in cell culture in a concentration-dependent fashion enabling the controlled modulation of protein fucosylation levels. 6,6,6-Trifluorofucose binds at an allosteric site of GDP-mannose 4,6-dehydratase (GMD) as revealed for the first time by the X-ray cocrystal structure of a bound allosteric GMD inhibitor. 6,6,6-Trifluorofucose was found to be incorporated in place of fucose at low levels (<1%) in the glycans of recombinantly expressed antibodies. A fucose-1-phosphonate analog, fucostatin II, was designed that inhibits fucosylation with no incorporation into antibody glycans, allowing the production of afucosylated antibodies in which the incorporation of non-native sugar is completely absent-a key advantage in the production of therapeutic antibodies, especially biosimilar antibodies. Inhibitor structure-activity relationships, identification of cellular and inhibitor metabolites in inhibitor-treated cells, fucose competition studies, and the production of recombinant antibodies with varying levels of fucosylation are described.
Assuntos
Fucose/metabolismo , Hidroliases/metabolismo , Bibliotecas de Moléculas Pequenas , Animais , Células CHO , Cricetinae , Cricetulus , Cristalografia por Raios X , Fucose/antagonistas & inibidores , Guanosina Difosfato Manose/metabolismo , Espectrometria de Massas , Estrutura Molecular , Ressonância de Plasmônio de SuperfícieRESUMO
IgG1 monoclonal antibodies with reduced glycan fucosylation have been shown to improve antibody-dependent cellular cytotoxicity (ADCC) by allowing more effective binding of the Fc region of these proteins to T cells receptors. Increased in vivo efficacy in animal models and oncology clinical trials has been associated with the enhanced ADCC provided by these engineered mAbs. 6,6,6-Trifluorofucose (1) is a new inhibitor of fucosylation that has been demonstrated to allow the preparation of IgG1 monoclonal antibodies with lower fucosylation levels and thus improve the ADCC of these proteins. A new process has been developed to support the preparation of 1 on large-scale for wide mAb manufacture applications. The target fucosylation inhibitor (1) was synthesized from readily available d-arabinose in 11% overall yield and >99.5/0.5 dr (diastereomeric ratio). The heavily telescoped process includes seven steps, two crystallizations as purification handles, and no chromatography. The key transformation of the sequence involves the diastereoselective preparation of the desired trifluoromethyl-bearing alcohol in >9/1 dr from a trimethylsilylketal intermediate via a ruthenium-catalyzed tandem ketal hydrolysis-transfer hydrogenation process.
Assuntos
Anticorpos Monoclonais/química , Fucose/análogos & derivados , Fucose/química , Citotoxicidade Celular Dependente de Anticorpos , Catálise , Cristalização , Hidrogenação , Imunoglobulina G/química , Oxirredução , Rutênio , EstereoisomerismoRESUMO
The Cell division cycle 7 (Cdc7) protein kinase is essential for DNA replication and maintenance of genome stability. We systematically explored thiazole-based compounds as inhibitors of Cdc7 kinase activity in cancer cells. Our studies resulted in the identification of a potent, selective Cdc7 inhibitor that decreased phosphorylation of the direct substrate MCM2 in vitro and in vivo, and inhibited DNA synthesis and cell viability in vitro.
Assuntos
Proteínas de Ciclo Celular/antagonistas & inibidores , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Tiazóis/síntese química , Tiazóis/farmacologia , Animais , Domínio Catalítico , Proteínas de Ciclo Celular/química , Proteínas de Ciclo Celular/metabolismo , Linhagem Celular Tumoral , Técnicas de Química Sintética , Feminino , Células HCT116 , Humanos , Concentração Inibidora 50 , Masculino , Camundongos , Componente 2 do Complexo de Manutenção de Minicromossomo/metabolismo , Simulação de Acoplamento Molecular , Fosforilação/efeitos dos fármacos , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/metabolismo , Proteínas Serina-Treonina Quinases/química , Proteínas Serina-Treonina Quinases/metabolismo , Ratos , Relação Estrutura-Atividade , Tiazóis/química , Tiazóis/metabolismo , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Acetyl-CoA carboxylase (ACC) is a target of interest for the treatment of metabolic syndrome. Starting from a biphenyloxadiazole screening hit, a series of piperazine oxadiazole ACC inhibitors was developed. Initial pharmacokinetic liabilities of the piperazine oxadiazoles were overcome by blocking predicted sites of metabolism, resulting in compounds with suitable properties for further in vivo studies. Compound 26 was shown to inhibit malonyl-CoA production in an in vivo pharmacodynamic assay and was advanced to a long-term efficacy study. Prolonged dosing with compound 26 resulted in impaired glucose tolerance in diet-induced obese (DIO) C57BL6 mice, an unexpected finding.
Assuntos
Acetil-CoA Carboxilase/antagonistas & inibidores , Inibidores Enzimáticos/farmacologia , Oxidiazóis/farmacologia , Piperazinas/farmacologia , Acetil-CoA Carboxilase/metabolismo , Animais , Dieta/efeitos adversos , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Humanos , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Camundongos Obesos , Estrutura Molecular , Oxidiazóis/síntese química , Oxidiazóis/química , Piperazinas/síntese química , Piperazinas/química , Relação Estrutura-AtividadeRESUMO
A series of aminooxadiazoles was optimized for inhibition of Cdc7. Early lead isoquinoline 1 suffered from modest cell potency (cellular IC50=0.71 µM measuring pMCM2), low selectivity against structurally related kinases, and high IV clearance in rats (CL=18 L/h/kg). Extensive optimization resulted in azaindole 26 (Cdc7 IC50=1.1 nM, pMCM2 IC50=32 nM) that demonstrated robust lowering of pMCM2 in a mouse pharmacodynamic (PD) model when dosed orally. Modifications to improve the pharmacokinetic profile of this series were guided by trapping experiments with glutathione in rat hepatocytes.
Assuntos
Proteínas de Ciclo Celular/antagonistas & inibidores , Oxidiazóis/química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Animais , Proteínas de Ciclo Celular/química , Proteínas de Ciclo Celular/metabolismo , Modelos Animais de Doenças , Feminino , Camundongos , Camundongos Nus , Estrutura Molecular , Oxidiazóis/síntese química , Oxidiazóis/farmacologia , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Proteínas Serina-Treonina Quinases/química , Proteínas Serina-Treonina Quinases/metabolismo , Ratos , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Cdc7 kinase is responsible for the initiation and regulation of DNA replication and has been proposed as a target for cancer therapy. We have identified a class of Cdc7 inhibitors based on a substituted indole core. Synthesis of focused indole and azaindole analogs yielded potent and selective 5-azaindole Cdc7 inhibitors with improved intrinsic metabolic stability (ie 36). In parallel, quantum mechanical conformational analysis helped to rationalize SAR observations, led to a proposal of the preferred binding conformation in the absence of co-crystallography data, and allowed the design of 7-azaindole 37 as a second lead in this series.
Assuntos
Compostos Aza/farmacologia , Proteínas de Ciclo Celular/antagonistas & inibidores , Indóis/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Animais , Compostos Aza/síntese química , Compostos Aza/química , Proteínas de Ciclo Celular/metabolismo , Relação Dose-Resposta a Droga , Humanos , Indóis/síntese química , Indóis/química , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Proteínas Serina-Treonina Quinases/metabolismo , Ratos , Relação Estrutura-AtividadeRESUMO
Through the analysis of X-ray crystallographic information and previous SAR studies, a novel series of protein kinase B (PKB/AKT) inhibitors was developed. The compounds showed nanomolar inhibition of AKT1 and were selective against cyclin-dependent kinase 2 (CDK2).
Assuntos
Amidas/farmacologia , Quinase 2 Dependente de Ciclina/antagonistas & inibidores , Desenho de Fármacos , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/farmacologia , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Amidas/síntese química , Amidas/química , Técnicas de Química Sintética , Cristalografia por Raios X , Quinase 2 Dependente de Ciclina/metabolismo , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/química , Modelos Moleculares , Estrutura Molecular , Proteínas Proto-Oncogênicas c-akt/metabolismo , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
Human murine double minute 2 (MDM2) is a negative regulator of p53, which plays an important role in cell cycle and apoptosis. We report several optimizations to the synthesis of the chromenotriazolopyrimidine series of MDM2-p53 protein-protein interaction inhibitors. Additionally, the in vitro and in vivo stability, pharmacokinetic properties and solubility were improved through N-substitution.
Assuntos
Proteínas Proto-Oncogênicas c-mdm2/antagonistas & inibidores , Pirimidinas/síntese química , Proteína Supressora de Tumor p53/antagonistas & inibidores , Animais , Estabilidade de Medicamentos , Humanos , Bombas de Infusão , Concentração Inibidora 50 , Estrutura Molecular , Pirimidinas/farmacocinética , Ratos , Solubilidade , Relação Estrutura-AtividadeRESUMO
Through a combination of screening and structure-based rational design, we have discovered a series of N(1)-(5-(heterocyclyl)-thiazol-2-yl)-3-(4-trifluoromethylphenyl)-1,2-propanediamines that were developed into potent ATP competitive inhibitors of AKT. Studies of linker strand-binding adenine isosteres identified SAR trends in potency and selectivity that were consistent with binding interactions observed in structures of the inhibitors bound to AKT1 and to the counter-screening target PKA. One compound was shown to have acceptable pharmacokinetic properties and to be a potent inhibitor of AKT signaling and of in vivo xenograft tumor growth in a preclinical model of glioblastoma.
Assuntos
Antineoplásicos/química , Azóis/química , Neoplasias/tratamento farmacológico , Inibidores de Proteínas Quinases/química , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Animais , Antineoplásicos/farmacocinética , Antineoplásicos/uso terapêutico , Azóis/farmacocinética , Azóis/uso terapêutico , Sítios de Ligação , Cristalografia por Raios X , Proteínas Quinases Dependentes de AMP Cíclico/antagonistas & inibidores , Proteínas Quinases Dependentes de AMP Cíclico/metabolismo , Quinase 2 Dependente de Ciclina/antagonistas & inibidores , Quinase 2 Dependente de Ciclina/metabolismo , Desenho de Fármacos , Camundongos , Camundongos Nus , Inibidores de Proteínas Quinases/farmacocinética , Inibidores de Proteínas Quinases/uso terapêutico , Proteínas Proto-Oncogênicas c-akt/metabolismo , Ratos , Ratos Sprague-Dawley , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
A 2-aminothiazole derivative 1 was developed as a potential inhibitor of the oncology target AKT, a serine/threonine kinase. When incubated in rat and human liver microsomes in the presence of NADPH, 1 underwent significant metabolic activation on its 2-aminothiazole ring, leading to substantial covalent protein binding. Upon addition of glutathione, covalent binding was reduced significantly, and multiple glutathione adducts were detected. Novel metabolites from the in vitro incubates were characterized by LC-MS and NMR to discern the mechanism of bioactivation. An in silico model was developed based on the proposed mechanism and was employed to predict bioactivation in 23 structural analogues. The predictions were confirmed empirically for the bioactivation liability, in vitro, by LC-MS methods screening for glutathione incorporation. New compounds were identified with a low propensity for bioactivation.
Assuntos
Sistema Enzimático do Citocromo P-450/metabolismo , Glutationa/metabolismo , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Tiazóis/efeitos adversos , Tiazóis/química , Animais , Compostos de Epóxi/metabolismo , Humanos , Microssomos Hepáticos/efeitos dos fármacos , Microssomos Hepáticos/metabolismo , Modelos Biológicos , Estrutura Molecular , Ratos , Tiazóis/metabolismoRESUMO
Tumor protein 53 (p53) is a critical regulator of cell cycle and apoptosis that is frequently disabled in human tumors. In many tumor types, p53 is deleted or mutated, but in others p53 is inactivated by overexpression or amplification of its negative regulator mouse double minute 2 (MDM2). A high-throughput screening effort identified 6,7-bis(4-bromophenyl)-7,12-dihydro-6H-chromeno[4,3-d][1,2,4]triazolo[1,5-a]pyrimidine as a potent inhibitor of the MDM2-p53 protein-protein interaction. This screening hit was found to be chemically unstable and difficult to handle due to poor DMSO solubility. Co-crystallization with the target protein helped to direct further optimization and provided a tractable lead series of novel MDM2-p53 inhibitors. In cellular assays, these compounds were shown to upregulate p53 protein levels and p53 signaling and to cause p53-dependent inhibition of proliferation and apoptosis.
Assuntos
Descoberta de Drogas , Proteínas Proto-Oncogênicas c-mdm2/metabolismo , Pirimidinas/química , Pirimidinas/farmacologia , Proteína Supressora de Tumor p53/metabolismo , Apoptose/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Células HCT116 , Humanos , Concentração Inibidora 50 , Modelos Moleculares , Conformação Molecular , Ligação Proteica/efeitos dos fármacos , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A screening campaign of a diverse collection of approximately 250,000 small molecule compounds was performed to identify inhibitors of proline-rich tyrosine kinase 2 (Pyk2) with potential osteogenic activity in osteoblast cells. Compounds were prioritized based on selectivity following a counter-screen against focal adhesion kinase (FAK), a closely related kinase. 4-Amino and 5-aryl substituted pyridinone series were identified that showed strong biochemical potency against Pyk2 and up to 3700-fold selectivity over FAK. Modeling analysis suggested that structural differences in the substrate binding cleft could explain the high selectivity of these chemical series against FAK. Representative compounds from each series showed inhibition of Pyk2 autophosphorylation in 293T cells (IC(50) approximately 0.11 microM), complete inhibition of endogenous Pyk2 in A7r5 cells and increased levels of osteogenic markers in MC3T3 osteoblast cells (EC(50)'s approximately 0.01 microM). These results revealed a new class of compounds with osteogenic-inducing activity in osteoblast cells and a starting point for the development of more potent and selective Pyk2 inhibitors.
Assuntos
Quinase 2 de Adesão Focal/antagonistas & inibidores , Osteoblastos/enzimologia , Inibidores de Proteínas Quinases/química , Piridonas/química , Animais , Sítios de Ligação , Linhagem Celular , Simulação por Computador , Quinase 2 de Adesão Focal/metabolismo , Humanos , Camundongos , Osteoblastos/efeitos dos fármacos , Fosforilação , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/farmacologia , Piridonas/síntese química , Piridonas/farmacologia , Bibliotecas de Moléculas Pequenas , Relação Estrutura-AtividadeRESUMO
[reaction: see text] New air-stable PdCl(2){P(t)Bu(2)(p-R-Ph)}(2) (R = H, NMe(2), CF(3),) complexes represent simple, general, and efficient catalysts for the Suzuki-Miyaura cross-coupling reactions of aryl halides including five-membered heteroaryl halides and heteroatom-substituted six-membered heteroaryl chlorides with a diverse range of arylboronic acids. High product yields (89-99% isolated yields) and turn-over-numbers (10,000 TON) are observed.
RESUMO
The total synthesis of racemic rishirilide B has been accomplished. The synthesis serves to define the relative relationships of its stereogenic centers. Also, starting with readily available chiral pool, ent-rishirilide B was synthesized, thereby demonstrating that natural configuration of rishirilide B. The defining step in our total synthesis is the facile cycloreversion of the bis(siloxy)benzocyclobutane and the intermolecular o-quinodimethide Diels-Alder cycloaddition. We believe that the tight regiochemical guidance in this step arises from a meshing of the electron-donating effects of the symmetry-perturbing aromatic OTBS group of the o-quinodimethide diene with the reactivity differential of the dienophile (enedione), modulated by the hydroxyl group at the alpha-position. The validity of the hypothesis of hydroxy-directed activation of its vicinal ketone function in the context of the enedione dienophile warrants further study. This type of activation may find broader applications in distinguishing reactivity profiles of key closely related functional groups in organic substrates.