RESUMO
The NOD-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome is a multiprotein complex and component of the innate immune system that is activated by exogenous and endogenous danger signals to promote activation of caspase-1 and the maturation and release of the proinflammatory cytokines interleukin (IL)-1ß and IL-18. Inappropriate activation of NLRP3 has been implicated in the pathophysiology of multiple inflammatory and autoimmune diseases, including cardiovascular disease, neurodegenerative diseases, and nonalcoholic steatohepatitis (NASH), thus increasing the clinical interest of this target. We describe in this study the preclinical pharmacologic, pharmacokinetic, and pharmacodynamic properties of a novel and highly specific NLRP3 inhibitor, JT001 (6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-3-sulfonylurea). In cell-based assays, JT001 potently and selectively inhibited NLRP3 inflammasome assembly, resulting in the inhibition of cytokine release and the prevention of pyroptosis, a form of inflammatory cell death triggered by active caspase-1. Oral administration of JT001 to mice inhibited IL-1ß production in peritoneal lavage fluid at plasma concentrations that correlated with mouse in vitro whole blood potency. Orally administered JT001 was effective in reducing hepatic inflammation in three different murine models, including the Nlrp3A350V /+CreT model of Muckle-Wells syndrome (MWS), a diet-induced obesity NASH model, and a choline-deficient diet-induced NASH model. Significant reductions in hepatic fibrosis and cell damage were also observed in the MWS and choline-deficient models. Our findings demonstrate that blockade of NLRP3 attenuates hepatic inflammation and fibrosis and support the use of JT001 to investigate the role of NLRP3 in other inflammatory disease models. SIGNIFICANCE STATEMENT: Persistent inflammasome activation is the consequence of inherited mutations of NLRP3 and results in the development of cryopyrin-associated periodic syndromes associated with severe systemic inflammation. NLRP3 is also upregulated in nonalcoholic steatohepatitis, a metabolic chronic liver disease currently missing a cure. Selective and potent inhibitors of NLRP3 hold great promise and have the potential to overcome an urgent unmet need.
Assuntos
Hepatopatia Gordurosa não Alcoólica , Camundongos , Animais , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Hepatopatia Gordurosa não Alcoólica/metabolismo , Inflamassomos/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Proteínas NLR , Domínio Pirina , Cirrose Hepática/tratamento farmacológico , Cirrose Hepática/prevenção & controle , Caspase 1/metabolismo , Inflamação , Colina/efeitos adversos , Interleucina-1beta/metabolismoRESUMO
The histone demethylase LSD1 is a key enzyme in the epigenetic regulation of gene transcription. Here we present our efforts to discover small molecule reversible inhibitors of LSD1 as an attractive approach to treat hematologic malignancies and certain solid tumors. Using structure-based drug design, we designed and synthesized a novel series of heteroaromatic imidazole inhibitors that demonstrate potent inhibition of the demethylase activity and low nanomolar cell-based activity. This novel LSD1 inhibitor series was further optimized by attenuating the hERG inhibition and improving oral bioavailability.
Assuntos
Descoberta de Drogas , Inibidores Enzimáticos/farmacologia , Histona Desmetilases/antagonistas & inibidores , Imidazóis/farmacologia , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Histona Desmetilases/metabolismo , Humanos , Imidazóis/síntese química , Imidazóis/química , Modelos Moleculares , Estrutura Molecular , Relação Estrutura-AtividadeRESUMO
Histone lysine demethylases (KDMs) play a key role in epigenetic regulation and KDM5A and KDM5B have been identified as potential anti-cancer drug targets. Using structural information from known KDM4 and KDM5 inhibitors, a potent series of pyrazolylpyridines was designed. Structure-activity relationship (SAR) exploration resulted in the identification of compound 33, an orally available, potent inhibitor of KDM5A/5B with promising selectivity. Potent cellular inhibition as measured by levels of tri-methylated H3K4 was demonstrated with compound 33 in the breast cancer cell line ZR-75-1.
Assuntos
Antineoplásicos/farmacologia , Descoberta de Drogas , Inibidores Enzimáticos/farmacologia , Histona Desmetilases com o Domínio Jumonji/antagonistas & inibidores , Proteínas Nucleares/antagonistas & inibidores , Proteínas Repressoras/antagonistas & inibidores , Proteína 2 de Ligação ao Retinoblastoma/antagonistas & inibidores , 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 , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Feminino , Humanos , Histona Desmetilases com o Domínio Jumonji/metabolismo , Células MCF-7 , Neoplasias Mamárias Experimentais/tratamento farmacológico , Neoplasias Mamárias Experimentais/patologia , Modelos Moleculares , Estrutura Molecular , Proteínas Nucleares/metabolismo , Proteínas Repressoras/metabolismo , Proteína 2 de Ligação ao Retinoblastoma/metabolismo , Relação Estrutura-AtividadeRESUMO
The bromodomain and extra-terminal (BET) family of epigenetic proteins has attracted considerable attention in drug discovery given its involvement in regulating gene transcription. Screening a focused small molecule library based on the bromodomain pharmacophore resulted in the identification of 2-methylisoquinoline-1-one as a novel BET bromodomain-binding motif. Structure guided SAR exploration resulted in >10,000-fold potency improvement for the BRD4-BD1 bromodomain. Lead compounds exhibited excellent potencies in both biochemical and cellular assays in MYC-dependent cell lines. Compound 36 demonstrated good physicochemical properties and promising exposure levels in exploratory PK studies.
Assuntos
Desenho de Fármacos , Isoquinolinas/química , Proteínas Nucleares/antagonistas & inibidores , Fatores de Transcrição/antagonistas & inibidores , Sítios de Ligação , Proteínas de Ciclo Celular , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Cristalografia por Raios X , Humanos , Concentração Inibidora 50 , Isoquinolinas/síntese química , Isoquinolinas/farmacologia , Simulação de Dinâmica Molecular , Proteínas Nucleares/metabolismo , Estrutura Terciária de Proteína , Relação Estrutura-Atividade , Fatores de Transcrição/metabolismoRESUMO
The NLRP3 inflammasome is an intracellular, multiprotein complex that promotes the auto-catalytic activation of caspase-1 and the subsequent maturation and secretion of the pro-inflammatory cytokines, IL-1ß and IL-18. Persistent activation of the NLRP3 inflammasome has been implicated in the pathophysiology of a number of inflammatory and autoimmune diseases, including neuroinflammation, cardiovascular disease, non-alcoholic steatohepatitis, lupus nephritis and severe asthma. Here we describe the preclinical profile of JT002, a novel small molecule inhibitor of the NLRP3 inflammasome. JT002 potently reduced NLRP3-dependent proinflammatory cytokine production across a number of cellular assays and prevented pyroptosis, an inflammatory form of cell death triggered by active caspase-1. JT002 demonstrated in vivo target engagement at therapeutically relevant concentrations when orally dosed in mice and prevented body weight loss and improved inflammatory and fibrotic endpoints in a model of Muckle-Wells syndrome (MWS). In two distinct models of neutrophilic airway inflammation, JT002 treatment significantly reduced airway hyperresponsiveness and airway neutrophilia. These results provide a rationale for the therapeutic targeting of the NLRP3 inflammasome in severe asthma and point to the use of JT002 in a variety of inflammatory disorders.
Assuntos
Doenças Cardiovasculares , Nefrite Lúpica , Animais , Camundongos , Inflamassomos , Proteína 3 que Contém Domínio de Pirina da Família NLR , Caspase 1RESUMO
A novel class of Hsp90 inhibitors, structurally distinct from previously reported scaffolds, was developed from rational design and optimization of a compound library screen hit. These aminoquinazoline derivatives, represented by compound 15 (SNX-6833) or 1-(2-amino-4-methylquinazolin-7-yl)-3,6,6-trimethyl-6,7-dihydro-1H-indol-4(5H)-one, selectively bind to Hsp90 and inhibit its cellular activities at concentrations as low as single digit nanomolar.
Assuntos
Antineoplásicos/síntese química , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Indóis/síntese química , Quinazolinas/síntese química , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Proliferação de Células , Descoberta de Drogas , Ensaios de Seleção de Medicamentos Antitumorais , Proteínas de Choque Térmico HSP90/química , Humanos , Indóis/farmacologia , Modelos Moleculares , Ligação Proteica , Quinazolinas/farmacologia , Bibliotecas de Moléculas Pequenas , Relação Estrutura-AtividadeRESUMO
Inappropriate activation of the NLRP3 inflammasome has been implicated in multiple inflammatory and autoimmune diseases. Herein, we aimed to develop novel NLRP3 inhibitors that could minimize the risk of drug-induced liver injury. Lipophilic ligand efficiency was used as a guiding metric to identify a series of 6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazinesulfonylureas. A leading compound from this series was advanced into safety studies in cynomolgus monkeys, and renal toxicity, due to compound precipitation, was observed. To overcome this obstacle, we focused on improving the solubility of our compounds, specifically by introducing basic amine substituents into the scaffold. This led to the identification of GDC-2394, a potent and selective NLRP3 inhibitor, with an in vitro and in vivo safety profile suitable for advancement into human clinical trials.
Assuntos
Proteína 3 que Contém Domínio de Pirina da Família NLR , Oxazinas , Animais , Humanos , Oxazinas/farmacologia , Oxazinas/uso terapêutico , Inflamassomos , Sulfonamidas/farmacologia , Macaca fascicularisRESUMO
Aggregation of alpha-synuclein (alphasyn) is a hallmark of sporadic and familial Parkinson's disease (PD) and dementia with Lewy bodies. Lewy bodies contain alphasyn and several heat shock proteins (Hsp), a family of molecular chaperones up-regulated by the cell under stress. We have previously shown that direct expression of Hsp70 and pharmacological up-regulation of Hsp70 by geldanamycin, an Hsp90 inhibitor, are protective against alphasyn-induced toxicity and prevent aggregation in culture. Here, we use a novel protein complementation assay to screen a series of small-molecule Hsp90 inhibitors for their ability to prevent alphasyn oligomerization and rescue toxicity. By use of this assay, we found that several compounds prevented alphasyn oligomerization as measured by decreased luciferase activity, led to a reduction in high-molecular-mass oligomeric alphasyn, and protected against alphasyn cytotoxicity. A lead compound, SNX-0723 (2-fluoro-6-[(3S)-tetrahydrofuran-3-ylamino]-4-(3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)benzamide) was determined to have an EC(50) for inhibition of alphasyn oligomerization of approximately 48 nM and was able to rescue alphasyn-induced toxicity. In vivo assessment of SNX-0723 showed significant brain concentrations along with induction of brain Hsp70. With a low EC(50), brain permeability, and oral availability, these novel inhibitors represent an exciting new therapeutic strategy for PD.
Assuntos
Encéfalo/metabolismo , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Indóis/farmacologia , alfa-Sinucleína/metabolismo , ortoaminobenzoatos/farmacologia , Administração Oral , Animais , Benzamidas , Disponibilidade Biológica , Permeabilidade da Membrana Celular , Feminino , Humanos , Indóis/química , Indóis/farmacocinética , Ratos , Ratos Sprague-Dawley , Relação Estrutura-Atividade , Transfecção , alfa-Sinucleína/química , alfa-Sinucleína/genética , ortoaminobenzoatos/química , ortoaminobenzoatos/farmacocinéticaRESUMO
Histone demethylase LSDl (KDMlA) belongs to the flavin adenine dinucleotide (FAD) dependent family of monoamine oxidases and is vital in regulation of mammalian biology. Dysregulation and overexpression of LSD1 are hallmarks of a number of human diseases, particularly cancers that are characterized as morphologically poorly differentiated. As such, inhibitors of LSD1 have potential to be beneficial as a cancer therapy. The most clinically advanced inhibitors of LSDl are covalent inhibitors derived from tranylcypromine (TCP). Herein, we report the discovery of a novel series of reversible and selective LSDl inhibitors. Exploration of structure-activity relationships (SARs) and optimization of ADME properties resulted in the identification of clinical candidate CC-90011. CC-90011 exhibits potent on-target induction of cellular differentiation in acute myeloid leukemia (AML) and small cell lung cancer (SCLC) cell lines, and antitumor efficacy in patient-derived xenograft (PDX) SCLC models. CC-90011 is currently in phase 2 trials in patients with first line, extensive stage SCLC (ClinicalTrials.gov identifier: NCT03850067).
Assuntos
Inibidores Enzimáticos/farmacologia , Histona Desmetilases/antagonistas & inibidores , Compostos Orgânicos/farmacologia , Linhagem Celular Tumoral , Inibidores Enzimáticos/química , Humanos , Compostos Orgânicos/química , Relação Estrutura-AtividadeRESUMO
Inhibition of Hsp90 has emerged as a therapeutic strategy to target NSCLC subtypes, which are refractory to epidermal growth factor receptor (EGFR) inhibitor-based treatment. We report on a novel small molecule inhibitor of Hsp90, SNX-2112, and an orally bioavailable prodrug analog, SNX-5422. In cellular models of wild-type or mutant EGFR (L858R and T790M mutations), SNX-2112 alone and in combination with erlotinib inhibited EGF activation of pAKT(473) and pSTAT3(705). pERK1/2 and pS6 were also potently inhibited by similar treatments. SNX-2112 reduced EGF cross-talk and activation of the c-Met receptor by causing c-Met degradation. In NCI-H1975 xenograft models, SNX-5422 showed activity as a single agent and in combination with erlotinib resulted in prolonged animal survival at reduced compound concentrations relative to either compound alone. These results support the advanced evaluation of SNX-5422 as a treatment for non-small cell lung cancer (NSCLC), especially in cases where the cancer is driven by c-Met amplification or mutated EGFR forms that are resistant to EGFR inhibitors.
Assuntos
Modelos Animais de Doenças , Resistencia a Medicamentos Antineoplásicos , Receptores ErbB/metabolismo , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Compostos Heterocíclicos de 4 ou mais Anéis/farmacologia , Quinazolinas/farmacologia , Transdução de Sinais/efeitos dos fármacos , Animais , Antineoplásicos/farmacologia , Protocolos de Quimioterapia Combinada Antineoplásica , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/metabolismo , Carcinoma Pulmonar de Células não Pequenas/patologia , Linhagem Celular Tumoral , Receptores ErbB/antagonistas & inibidores , Cloridrato de Erlotinib , Feminino , Humanos , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Pulmonares/metabolismo , Neoplasias Pulmonares/patologia , Camundongos , Camundongos Nus , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
In the course of our Heat Shock 90 program, certain carbazole compounds were identified which had an off-target antiproliferative activity. To understand the off-target activity, we studied one analog with strong activity. We discovered that it had an effect on tubulin polymerization kinetics and was competitive with colchicine. Additional analogs were made, and a number of potent compounds were identified.
Assuntos
Antimitóticos/química , Carbazóis/química , Indóis/química , Antimitóticos/síntese química , Antimitóticos/farmacologia , Carbazóis/síntese química , Carbazóis/farmacologia , Linhagem Celular Tumoral , Colchicina/farmacologia , Ensaios de Seleção de Medicamentos Antitumorais , Proteínas de Choque Térmico HSP90/metabolismo , Humanos , Indóis/síntese química , Indóis/farmacologia , Tubulina (Proteína)/metabolismoRESUMO
Hsp90 maintains the conformational stability of multiple proteins implicated in oncogenesis and has emerged as a target for chemotherapy. We report here the discovery of a novel small molecule scaffold that inhibits Hsp90. X-ray data show that the scaffold binds competitively at the ATP site on Hsp90. Cellular proliferation and client assays demonstrate that members of the series are able to inhibit Hsp90 at nanomolar concentrations.
Assuntos
Antineoplásicos/farmacologia , Carbazóis/farmacologia , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Trifosfato de Adenosina/química , Antineoplásicos/síntese química , Antineoplásicos/química , Ligação Competitiva , Carbazóis/síntese química , Carbazóis/química , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Cristalografia por Raios X , Ensaios de Seleção de Medicamentos Antitumorais , Proteínas de Choque Térmico HSP90/química , Humanos , Modelos Moleculares , Estrutura Molecular , Peso Molecular , Bibliotecas de Moléculas Pequenas , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A novel series of pyrazolo[1,5-b]pyridazines have been synthesized and identified as cyclin dependant kinase inhibitors potentially useful for the treatment of solid tumors. Modification of the hinge-binding amine or the C(2)- and C(6)-substitutions on the pyrazolopyridazine core provided potent inhibitors of CDK4 and demonstrated enzyme selectivity against VEGFR-2 and GSK3beta.
Assuntos
Quinase 4 Dependente de Ciclina/antagonistas & inibidores , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/farmacologia , Piridazinas/síntese química , Piridazinas/farmacologia , Avaliação Pré-Clínica de Medicamentos , Ensaios de Seleção de Medicamentos Antitumorais , Quinase 3 da Glicogênio Sintase/antagonistas & inibidores , Glicogênio Sintase Quinase 3 beta , Modelos Moleculares , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidoresRESUMO
We herein disclose a novel chemical series of benzimidazole-ureas as inhibitors of VEGFR-2 and TIE-2 kinase receptors, both of which are implicated in angiogenesis. Structure-activity relationship (SAR) studies elucidated a critical role for the N1 nitrogen of both the benzimidazole (segment E) and urea (segment B) moieties. The SAR results were also supported by the X-ray crystallographic elucidation of the role of the N1 nitrogen and the urea moiety when the benzimidazole-urea compounds were bound to the VEGFR-2 enzyme. The left side phenyl ring (segment A) occupies the backpocket where a 3-hydrophobic substituent was favored for TIE-2 activity.
Assuntos
Benzimidazóis/síntese química , Modelos Moleculares , Receptor TIE-2/antagonistas & inibidores , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores , Animais , Benzimidazóis/química , Benzimidazóis/farmacologia , Sítios de Ligação , Cristalografia por Raios X , Humanos , Camundongos , Estrutura Molecular , Células NIH 3T3 , Fosforilação , Receptor TIE-2/metabolismo , Relação Estrutura-Atividade , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/químicaRESUMO
Histone lysine demethylases (KDMs) play a vital role in the regulation of chromatin-related processes. Herein, we describe our discovery of a series of potent KDM4 inhibitors that are both cell permeable and antiproliferative in cancer models. The modulation of histone H3K9me3 and H3K36me3 upon compound treatment was verified by homogeneous time-resolved fluorescence assay and by mass spectroscopy detection. Optimization of the series using structure-based drug design led to compound 6 (QC6352), a potent KDM4 family inhibitor that is efficacious in breast and colon cancer PDX models.
RESUMO
A series of derivatives of 2-anilino-5-phenyloxazole (5) has been identified as inhibitors of VEGFR2 kinase. Herein we describe the structure-activity relationship (SAR) of this novel template. Optimization of both aryl rings led to very potent inhibitors at both the enzymatic and cellular levels. Oxazole 39 had excellent solubility and good oral PK when dosed as the bis-mesylate salt and demonstrated moderate in vivo efficacy against HT29 human colon tumor xenografts. X-ray crystallography confirmed the proposed binding mode, and comparison of oxazoles 39 and 46 revealed interesting differences in orientation of 2-pyridyl and 3-pyridyl rings, respectively, attached at the meta position of the 5-phenyl ring.
Assuntos
Inibidores da Angiogênese/síntese química , Compostos de Anilina/síntese química , Oxazóis/síntese química , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores , Trifosfato de Adenosina/química , Inibidores da Angiogênese/farmacocinética , Inibidores da Angiogênese/farmacologia , Compostos de Anilina/farmacocinética , Compostos de Anilina/farmacologia , Animais , Sítios de Ligação , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Cristalografia por Raios X , Cães , Humanos , Ligantes , Masculino , Camundongos , Modelos Moleculares , Oxazóis/farmacocinética , Oxazóis/farmacologia , Ratos , Ratos Sprague-Dawley , Solubilidade , Relação Estrutura-Atividade , Veias Umbilicais/citologia , Fator A de Crescimento do Endotélio Vascular/farmacologia , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/química , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
DAPK1 and ZIPK (also called DAPK3) are closely related serine/threonine protein kinases that regulate programmed cell death and phosphorylation of non-muscle and smooth muscle myosin. We have developed a fluorescence linked enzyme chemoproteomic strategy (FLECS) for the rapid identification of inhibitors for any element of the purinome and identified a selective pyrazolo[3,4-d]pyrimidinone (HS38) that inhibits DAPK1 and ZIPK in an ATP-competitive manner at nanomolar concentrations. In cellular studies, HS38 decreased RLC20 phosphorylation. In ex vivo studies, HS38 decreased contractile force generated in mouse aorta, rabbit ileum, and calyculin A stimulated arterial muscle by decreasing RLC20 and MYPT1 phosphorylation. The inhibitor also promoted relaxation in Ca(2+)-sensitized vessels. A close structural analogue (HS43) with 5-fold lower affinity for ZIPK produced no effect on cells or tissues. These findings are consistent with a mechanism of action wherein HS38 specifically targets ZIPK in smooth muscle. The discovery of HS38 provides a lead scaffold for the development of therapeutic agents for smooth muscle related disorders and a chemical means to probe the function of DAPK1 and ZIPK across species.
Assuntos
Proteínas Quinases Associadas com Morte Celular/antagonistas & inibidores , Proteínas de Fluorescência Verde/metabolismo , Músculo Liso/efeitos dos fármacos , Miócitos de Músculo Liso/efeitos dos fármacos , Inibidores de Proteínas Quinases/farmacologia , Pirazóis/farmacologia , Pirimidinonas/farmacologia , Proteínas Recombinantes de Fusão/metabolismo , Trifosfato de Adenosina/metabolismo , Animais , Aorta/citologia , Aorta/efeitos dos fármacos , Aorta/enzimologia , Ligação Competitiva , Cálcio/metabolismo , Proteínas Quinases Associadas com Morte Celular/genética , Proteínas Quinases Associadas com Morte Celular/metabolismo , Proteínas de Fluorescência Verde/genética , Células HEK293 , Ensaios de Triagem em Larga Escala , Humanos , Íleo/citologia , Íleo/efeitos dos fármacos , Íleo/enzimologia , Camundongos , Contração Muscular/efeitos dos fármacos , Músculo Liso/citologia , Músculo Liso/enzimologia , Miócitos de Músculo Liso/citologia , Miócitos de Músculo Liso/enzimologia , Quinase de Cadeia Leve de Miosina/antagonistas & inibidores , Quinase de Cadeia Leve de Miosina/metabolismo , Fosfatase de Miosina-de-Cadeia-Leve , Fosforilação , Cultura Primária de Células , Inibidores de Proteínas Quinases/química , Proteômica , Pirazóis/química , Pirimidinonas/química , Coelhos , Proteínas Recombinantes de Fusão/genéticaRESUMO
A chemoproteomics-based drug discovery strategy is presented that utilizes a highly parallel screening platform, encompassing more than 1000 targets, with a focused chemical library prior to target selection. This chemoproteomics-based process enables a data-driven selection of both the biological target and chemical hit after the screen is complete. The methodology has been exemplified for the purine binding proteome (proteins utilizing ATP, NAD, FAD). Screening of an 8000 member library yielded over 1500 unique protein-ligand interactions, which included novel hits for the oncology target Hsp90. The approach, which also provides broad target selectivity information, was used to drive the identification of a potent and orally active Hsp90 inhibitor, SNX-5422, which is currently in phase 1 clinical studies.
Assuntos
Avaliação Pré-Clínica de Medicamentos/métodos , Proteínas de Choque Térmico HSP90/metabolismo , Proteômica/métodos , Trifosfato de Adenosina/metabolismo , Administração Oral , Animais , Ligação Competitiva , Ensaios Clínicos Fase I como Assunto , Feminino , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Proteínas de Choque Térmico HSP90/química , Humanos , Camundongos , Modelos Moleculares , Conformação Molecular , Bibliotecas de Moléculas Pequenas/administração & dosagem , Bibliotecas de Moléculas Pequenas/química , Bibliotecas de Moléculas Pequenas/metabolismo , Bibliotecas de Moléculas Pequenas/farmacologia , Especificidade por SubstratoRESUMO
A novel class of heat shock protein 90 (Hsp90) inhibitors was developed from an unbiased screen to identify protein targets for a diverse compound library. These indol-4-one and indazol-4-one derived 2-aminobenzamides showed strong binding affinity to Hsp90, and optimized analogues exhibited nanomolar antiproliferative activity across multiple cancer cell lines. Heat shock protein 70 (Hsp70) induction and specific client protein degradation in cells on treatment with the inhibitors supported Hsp90 inhibition as the mechanism of action. Computational chemistry and X-ray crystallographic analysis of selected member compounds clearly defined the protein-inhibitor interaction and assisted the design of analogues. 4-[6,6-Dimethyl-4-oxo-3-(trifluoromethyl)-4,5,6,7-tetrahydro-1H-indazol-1-yl]-2-[(trans-4-hydroxycyclohexyl)amino]benzamide (SNX-2112, 9) was identified as highly selective and potent (IC(50) Her2 = 11 nM, HT-29 = 3 nM); its prodrug amino-acetic acid 4-[2-carbamoyl-5-(6,6-dimethyl-4-oxo-3-trifluoromethyl-4,5,6,7-tetrahydro-indazol-1-yl)-phenylamino]-cyclohexyl ester methanesulfonate (SNX-5422, 10) was orally bioavailable and efficacious in a broad range of xenograft tumor models (e.g. 67% growth delay in a HT-29 model) and is now in multiple phase I clinical trials.