RESUMEN
The COVID-19 pandemic has caused people immense suffering all over the world. Although the World Health Organization (WHO) has announced the end of the pandemic, the sporadic virus epidemic is still ongoing and may exist permanently. Effective antivirals against SARS-CoV-2 are important to deal with the long-term threat. The main protease (Mpro) is a crucial target for drug development due to its role in the process of virus's replication and transcription. Herein, we report benzodiazepine derivatives as a new class of Mpro inhibitors. Structure-activity relationship (SAR) studies led to the discovery of the most active compound, methyl 10-(2-chloroacetyl)-1-oxo-11-(4-(trifluoromethyl)phenyl)-2,3,4,5,10,11-hexahydro-1H-dibenzo[b,e][1,4]-diazepine-7-carboxylate (11a), which shows an IC50 value of 0.180 ± 0.004 µM. The X-ray crystal structure shows that 11a covalently binds to Mpro. Collectively, we have obtained a new small molecule inhibitor targeting Mpro, which can serve as a lead compound for subsequent drug discovery against SARS-CoV-2.
Asunto(s)
Benzodiazepinas , COVID-19 , Proteasas 3C de Coronavirus , Inhibidores de Proteasas , Humanos , Anticonvulsivantes , Antivirales/farmacología , Benzodiazepinas/farmacología , Hipnóticos y Sedantes , Simulación del Acoplamiento Molecular , Pandemias , Inhibidores de Proteasas/química , Inhibidores de Proteasas/farmacología , SARS-CoV-2/metabolismo , Proteasas 3C de Coronavirus/antagonistas & inhibidoresRESUMEN
Emerging SARS-CoV-2 variants, particularly the Omicron variant and its sublineages, continually threaten the global public health. Small molecule antivirals are an effective treatment strategy to fight against the virus. However, the first-generation antivirals either show limited clinical efficacy and/or have some defects in pharmacokinetic (PK) properties. Moreover, with increased use of these drugs across the globe, they face great pressure of drug resistance. We herein present the discovery and characterization of a new generation antiviral drug candidate (SY110), which is a potent and selective inhibitor of SARS-CoV-2 main protease (Mpro). This compound displayed potent in vitro antiviral activity against not only the predominant SARS-CoV-2 Omicron sublineage BA.5, but also other highly pathogenic human coronaviruses including SARS-CoV-1 and MERS-CoV. In the Omicron-infected K18-hACE2 mouse model, oral treatment with SY110 significantly lowered the viral burdens in lung and alleviated the virus-induced pathology. Importantly, SY110 possesses favorable PK properties with high oral drug exposure and oral bioavailability, and also an outstanding safety profile. Furthermore, SY110 exhibited sensitivity to several drug-resistance Mpro mutations. Collectively, this investigation provides a promising new drug candidate against Omicron and other variants of SARS-CoV-2.
Asunto(s)
COVID-19 , Proteasas 3C de Coronavirus , SARS-CoV-2 , Animales , Humanos , Ratones , Administración Oral , Antivirales/farmacología , SARS-CoV-2/efectos de los fármacos , SARS-CoV-2/metabolismo , Tratamiento Farmacológico de COVID-19/métodos , Proteasas 3C de Coronavirus/antagonistas & inhibidoresRESUMEN
The retrieval of hit/lead compounds with novel scaffolds during early drug development is an important but challenging task. Various generative models have been proposed to create drug-like molecules. However, the capacity of these generative models to design wet-lab-validated and target-specific molecules with novel scaffolds has hardly been verified. We herein propose a generative deep learning (GDL) model, a distribution-learning conditional recurrent neural network (cRNN), to generate tailor-made virtual compound libraries for given biological targets. The GDL model is then applied to RIPK1. Virtual screening against the generated tailor-made compound library and subsequent bioactivity evaluation lead to the discovery of a potent and selective RIPK1 inhibitor with a previously unreported scaffold, RI-962. This compound displays potent in vitro activity in protecting cells from necroptosis, and good in vivo efficacy in two inflammatory models. Collectively, the findings prove the capacity of our GDL model in generating hit/lead compounds with unreported scaffolds, highlighting a great potential of deep learning in drug discovery.
Asunto(s)
Aprendizaje Profundo , Redes Neurales de la Computación , Descubrimiento de Drogas , Necroptosis , Diseño de FármacosRESUMEN
Emerging SARS-CoV-2 variants continue to cause waves of new infections globally. Developing effective antivirals against SARS-CoV-2 and its variants is an urgent task. The main protease (Mpro) of SARS-CoV-2 is an attractive drug target because of its central role in viral replication and its conservation among variants. We herein report a series of potent α-ketoamide-containing Mpro inhibitors obtained using the Ugi four-component reaction. The prioritized compound, Y180, showed an IC50 of 8.1 nM against SARS-CoV-2 Mpro and had oral bioavailability of 92.9%, 31.9% and 85.7% in mice, rats and dogs, respectively. Y180 protected against wild-type SARS-CoV-2, B.1.1.7 (Alpha), B.1.617.1 (Kappa) and P.3 (Theta), with EC50 of 11.4, 20.3, 34.4 and 23.7 nM, respectively. Oral treatment with Y180 displayed a remarkable antiviral potency and substantially ameliorated the virus-induced tissue damage in both nasal turbinate and lung of B.1.1.7-infected K18-human ACE2 (K18-hACE2) transgenic mice. Therapeutic treatment with Y180 improved the survival of mice from 0 to 44.4% (P = 0.0086) upon B.1.617.1 infection in the lethal infection model. Importantly, Y180 was also highly effective against the B.1.1.529 (Omicron) variant both in vitro and in vivo. Overall, our study provides a promising lead compound for oral drug development against SARS-CoV-2.
Asunto(s)
Tratamiento Farmacológico de COVID-19 , SARS-CoV-2 , Enzima Convertidora de Angiotensina 2 , Animales , Antivirales/farmacología , Antivirales/uso terapéutico , Modelos Animales de Enfermedad , Perros , Humanos , Ratones , RatasRESUMEN
Ataxia telangiectasia mutated and Rad3-related (ATR) kinase is an important regulator of the DNA damage response (DDR), especially in response to replication stress (RS). Tumor cells with ataxia-telangiectasia mutated (ATM) kinase loss of function or DDR defects that promote replicative stress are often more reliant on ATR for survival, highlighting ATR as a good antitumor target under the principle of synthetic lethality. Herein we report the discovery of a potent and highly selective ATR inhibitor, SKLB-197, which was obtained through structural optimization and structure-activity relationship (SAR) studies towards a hit compound (Cpd-1). SKLB-197 showed an IC50 value of 0.013 µM against ATR but very weak or no activity against other 402 protein kinases. It displayed potent antitumor activity against ATM-deficent tumors both in vitro and in vivo. In addition, this compound exhibited good pharmacokinetic properties. Overall, SKLB-197 could be a promising lead compound for drug discovery targeting ATR and deserves further in-depth studies.
Asunto(s)
Ataxia Telangiectasia , Proteínas de la Ataxia Telangiectasia Mutada , Proteínas de Ciclo Celular/metabolismo , Daño del ADN , Humanos , Inhibidores de Proteínas Quinasas/química , Inhibidores de Proteínas Quinasas/farmacología , Proteínas Quinasas/metabolismo , Relación Estructura-ActividadRESUMEN
The NLRP3 inflammasome, which regulated a proinflammatory programmed cell death form termed pyroptosis, is involved in the pathological process of various human diseases, such as multiple sclerosis, type 2 diabetes, and gout. Thus, compounds inhibiting activation of the NLRP3 inflammasome can be promising treatments for these diseases. In this study, we conducted a phenotypic screening against NLRP3-dependent pyroptosis and discovered the hit compound 1, which showed moderate antipyroptotic activity. Chemistry efforts to improve potency of 1 resulted in a novel compound 59 (J114), which exhibited a half-maximal inhibitory concentration (IC50) of 0.077 ± 0.008 µM against cell pyroptosis. Interestingly, unlike all pyroptosis inhibitors currently reported, the activity of J114 showed significant differences in human- and mouse-derived cells. The IC50 of J114-mediated inhibition of IL-1ß secretion by human THP-1 macrophages was 0.098 µM, which was nearly 150-fold and 500-fold more potent than that of J774A.1 (14.62 µM) and bone marrow-derived macrophages (BMDMs) (48.98 µM), respectively. Further studies showed that J114 displayed remarkable inhibitory activity against NLRP3- and AIM2-but not NLRC4-dependent activation of caspase-1 and the release of IL-1ß in human THP-1 macrophages. Mechanistically, J114 disturbed the interaction of NLRP3 or AIM2 with the adaptor protein ASC and inhibited ASC oligomerization. Overall, our study identified a unique molecule that inhibits NLRP3 and AIM2 inflammasome activation and has species differences, which is worthy of further research to understand the differential regulation of the NLRP3 and AIM2 inflammasomes in humans and mice.
Asunto(s)
Diabetes Mellitus Tipo 2 , Inflamasomas , Animales , Proteínas de Unión al ADN , Interleucina-1beta/metabolismo , Ratones , Ratones Endogámicos C57BL , Proteína con Dominio Pirina 3 de la Familia NLR/metabolismo , Piroptosis , Especificidad de la EspecieRESUMEN
Tropomyosin receptor kinases (TrkA, TrkB, and TrkC) are attractive therapeutic targets for multiple cancers. Two first-generation small-molecule Trks inhibitors, larotrectinib and entrectinib, have just been approved to use clinically. However, the drug-resistance mutations of Trks have already emerged, which calls for new-generation Trks inhibitors. Herein, we report the structural optimization and structure-activity relationship studies of 6,6-dimethyl-4-(phenylamino)-6H-pyrimido[5,4-b][1,4]oxazin-7(8H)-one derivatives as a new class of pan-Trk inhibitors. The prioritized compound 11g exhibited low nanomolar IC50 values against TrkA, TrkB, and TrkC and various drug-resistant mutants. It also showed good kinase selectivity. 11g displayed excellent in vitro antitumor activity and strongly suppressed Trk-mediated signaling pathways in intact cells. In in vivo studies, compound 11g exhibited good antitumor activity in BaF3-TEL-TrkA and BaF3-TEL-TrkCG623R allograft mouse models without exhibiting apparent toxicity. Collectively, 11g could be a promising lead compound for drug discovery targeting Trks and deserves further investigation.
Asunto(s)
Oxazinas/química , Inhibidores de Proteínas Quinasas/química , Receptor trkA/antagonistas & inhibidores , Receptor trkB/antagonistas & inhibidores , Receptor trkC/antagonistas & inhibidores , Animales , Antineoplásicos/química , Antineoplásicos/metabolismo , Antineoplásicos/farmacología , Antineoplásicos/uso terapéutico , Sitios de Unión , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Diseño de Fármacos , Resistencia a Antineoplásicos/efectos de los fármacos , Semivida , Humanos , Ratones , Simulación del Acoplamiento Molecular , Neoplasias/tratamiento farmacológico , Neoplasias/patología , Oxazinas/metabolismo , Oxazinas/farmacología , Oxazinas/uso terapéutico , Inhibidores de Proteínas Quinasas/metabolismo , Inhibidores de Proteínas Quinasas/farmacología , Inhibidores de Proteínas Quinasas/uso terapéutico , Ratas , Receptor trkA/genética , Receptor trkA/metabolismo , Receptor trkB/genética , Receptor trkB/metabolismo , Receptor trkC/genética , Receptor trkC/metabolismo , Transducción de Señal/efectos de los fármacos , Relación Estructura-ActividadRESUMEN
A photoredox-mediated, regiospecific alkyl addition reaction of (hetero)arene-fused thiophenes has been developed, employing bench-stable N-benzoyl alkyl-sulfinamides as the alkyl sources. This protocol offers a unique desulfuration approach to generate alkyl radicals that proceeds via nitrogen-centered radical intermediates.
RESUMEN
Herein, we present a new desulfurative method for generating primary, secondary, and tertiary alkyl radicals through visible-light photoredox catalysis. A process that involves the generation of N-centered radicals from sulfinamide intermediates, followed by subsequent fragmentation, is critical to forming the corresponding alkyl radical species. This strategy has been successfully applied to conjugate addition reactions that features mild reaction conditions, broad substrate scope (>60 examples), and good functional-group tolerance.
RESUMEN
The asymmetric total syntheses of a group of structurally complex Kopsia alkaloids, (-)-kopsine, (-)-isokopsine, (+)-methyl chanofruticosinate, (-)-fruticosine, and (-)-kopsanone, has been achieved. The key strategies for the construction of the molecular complexity in the targets included an asymmetric Tsuji-Trost rearrangement to set the first quaternary carbon center at C20, an intramolecular cyclopropanation by diazo decomposition to install the second and third quaternary carbon centers at C2 and C7, respectively, and a SmI2 -promoted acyloin condensation to assemble the isokopsine core. A radical decarboxylation of an isokopsine-type intermediate results in a thermodynamic partial rearrangement to give N-decarbomethoxyisokopsine and N-decarbomethoxykopsine, two key intermediates for the syntheses of Kopsia alkaloids with different subtype core structures.