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1.
Biochem J ; 481(5): 345-362, 2024 Mar 06.
Artigo em Inglês | MEDLINE | ID: mdl-38314646

RESUMO

Adipogenesis, defined as the development of mature adipocytes from stem cell precursors, is vital for the expansion, turnover and health of adipose tissue. Loss of adipogenic potential in adipose stem cells, or impairment of adipogenesis is now recognised as an underlying cause of adipose tissue dysfunction and is associated with metabolic disease. In this study, we sought to determine the role of AMP-activated protein kinase (AMPK), an evolutionarily conserved master regulator of energy homeostasis, in adipogenesis. Primary murine adipose-derived stem cells were treated with a small molecule AMPK activator (BI-9774) during key phases of adipogenesis, to determine the effect of AMPK activation on adipocyte commitment, maturation and function. To determine the contribution of the repression of lipogenesis by AMPK in these processes, we compared the effect of pharmacological inhibition of acetyl-CoA carboxylase (ACC). We show that AMPK activation inhibits adipogenesis in a time- and concentration-dependent manner. Transient AMPK activation during adipogenic commitment leads to a significant, ACC-independent, repression of adipogenic transcription factor expression. Furthermore, we identify a striking, previously unexplored inhibition of leptin gene expression in response to both short-term and chronic AMPK activation irrespective of adipogenesis. These findings reveal that in addition to its effect on adipogenesis, AMPK activation switches off leptin gene expression in primary mouse adipocytes independently of adipogenesis. Our results identify leptin expression as a novel target of AMPK through mechanisms yet to be identified.


Assuntos
Proteínas Quinases Ativadas por AMP , Adipogenia , Animais , Camundongos , Células 3T3-L1 , Adipócitos/metabolismo , Adipogenia/genética , Tecido Adiposo/metabolismo , Proteínas Quinases Ativadas por AMP/genética , Proteínas Quinases Ativadas por AMP/metabolismo , Leptina/genética , Leptina/farmacologia , Leptina/metabolismo
2.
Bioorg Med Chem Lett ; 91: 129352, 2023 07 15.
Artigo em Inglês | MEDLINE | ID: mdl-37270074

RESUMO

Spleen tyrosine kinase (SYK) is a non-receptor cytoplasmic kinase. Due to its pivotal role in B cell receptor and Fc-receptor signalling, inhibition of SYK has been a target of interest in a variety of diseases. Herein, we report the use of structure-based drug design to discover a series of potent macrocyclic inhibitors of SYK, with excellent kinome selectivity and in vitro metabolic stability. We were able to remove hERG inhibition through the optimization of physical properties, and utilized a pro-drug strategy to address permeability challenges.


Assuntos
Proteínas Tirosina Quinases , Transdução de Sinais , Quinase Syk , Inibidores de Proteínas Quinases/farmacologia
3.
Bioorg Med Chem Lett ; 39: 127904, 2021 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-33684441

RESUMO

Free Energy Perturbation (FEP) calculations can provide high-confidence predictions of the interaction strength between a ligand and its protein target. We sought to explore a series of triazolopyrimidines which bind to the EED subunit of the PRC2 complex as potential anticancer therapeutics, using FEP calculations to inform compound design. Combining FEP predictions with a late-stage functionalisation (LSF) inspired synthetic approach allowed us to rapidly evaluate structural modifications in a previously unexplored region of the EED binding site. This approach generated a series of novel triazolopyrimidine EED ligands with improved physicochemical properties and which inhibit PRC2 methyltransferase activity in a cancer-relevant G401 cell line.


Assuntos
Desenho de Fármacos , Inibidores Enzimáticos/farmacologia , Complexo Repressor Polycomb 2/antagonistas & inibidores , Purinas/farmacologia , Termodinâmica , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Humanos , Ligantes , Microssomos Hepáticos/química , Microssomos Hepáticos/metabolismo , Estrutura Molecular , Complexo Repressor Polycomb 2/metabolismo , Purinas/síntese química , Purinas/química , Teoria Quântica , Relação Estrutura-Atividade
4.
Bioorg Med Chem Lett ; 30(18): 127393, 2020 09 15.
Artigo em Inglês | MEDLINE | ID: mdl-32721854

RESUMO

Spleen Tyrosine Kinase (SYK) is a well-studied enzyme with therapeutic applications in oncology and autoimmune diseases. We identified an azabenzimidazole (ABI) series of SYK inhibitors by mining activity data of 86,000 compounds from legacy biochemical assays with SYK and other homologous kinases as target enzymes. A structure-based design and hybridization approach was then used to improve the potency and kinase selectivity of the hits. Lead compound 23 from this novel ABI series has a SYK IC50 = 0.21 nM in a biochemical assay and inhibits growth of SUDHL-4 cells at a GI50 = 210 nM.


Assuntos
Doenças Autoimunes/tratamento farmacológico , Compostos Aza/química , Benzimidazóis/química , Inibidores de Proteínas Quinases/química , Quinase Syk/antagonistas & inibidores , Sequência de Aminoácidos , Compostos Aza/farmacologia , Benzimidazóis/farmacologia , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Desenho de Fármacos , Humanos , Concentração Inibidora 50 , Modelos Moleculares , Ligação Proteica , Conformação Proteica , Inibidores de Proteínas Quinases/farmacologia , Relação Estrutura-Atividade , Especificidade por Substrato
5.
Bioorg Med Chem Lett ; 30(22): 127523, 2020 11 15.
Artigo em Inglês | MEDLINE | ID: mdl-32877741

RESUMO

Hybridisation of amino-pyrimidine based SYK inhibitors (e.g. 1a) with previously reported diamine-based SYK inhibitors (e.g. TAK-659) led to the identification and optimisation of a novel pyrimidine-based series of potent and selective SYK inhibitors, where the original aminomethylene group was replaced by a 3,4-diaminotetrahydropyran group. The initial compound 5 achieved excellent SYK potency. However, it suffered from poor permeability and modest kinase selectivity. Further modifications of the 3,4-diaminotetrahydropyran group were identified and the interactions of those groups with Asp512 were characterised by protein X-ray crystallography. Further optimisation of this series saw mixed results where permeability and kinase selectivity were increased and oral bioavailability was achieved in the series, but at the expense of potent hERG inhibition.


Assuntos
Inibidores de Proteínas Quinases/farmacologia , Pirazóis/farmacologia , Pirimidinas/farmacologia , Quinase Syk/antagonistas & inibidores , Animais , Cães , Relação Dose-Resposta a Droga , Humanos , Microssomos Hepáticos/química , Microssomos Hepáticos/metabolismo , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Pirazóis/síntese química , Pirazóis/química , Pirimidinas/síntese química , Pirimidinas/química , Ratos , Ratos Wistar , Relação Estrutura-Atividade , Quinase Syk/metabolismo
6.
Bioorg Med Chem Lett ; 30(19): 127433, 2020 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-32717371

RESUMO

Spleen tyrosine kinase (SYK) is a non-receptor cytosolic kinase. Due to its pivotal role in B cell receptor and Fc-receptor signaling, inhibition of SYK has been targeted in a variety of disease areas. Herein, we report the optimization of a series of potent and selective SYK inhibitors, focusing on improving metabolic stability, pharmacokinetics and hERG inhibition. As a result, we identified 30, which exhibited no hERG activity but unfortunately was poorly absorbed in rats and mice. We also identified a SYK chemical probe, 17, which exhibits excellent potency at SYK, and an adequate rodent PK profile to support in vivo efficacy/PD studies.


Assuntos
Indazóis/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Quinase Syk/antagonistas & inibidores , Animais , Sítios de Ligação , Células CACO-2 , Cristalografia por Raios X , Canal de Potássio ERG1/antagonistas & inibidores , Humanos , Indazóis/síntese química , Indazóis/metabolismo , Indazóis/farmacocinética , Camundongos , Microssomos Hepáticos/metabolismo , Estrutura Molecular , Ligação Proteica , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/metabolismo , Inibidores de Proteínas Quinases/farmacocinética , Ratos Wistar , Relação Estrutura-Atividade , Quinase Syk/química , Quinase Syk/metabolismo
7.
Bioorg Med Chem Lett ; 29(15): 1962-1967, 2019 08 01.
Artigo em Inglês | MEDLINE | ID: mdl-31153805

RESUMO

The TRAF2 and NCK interacting kinase (TNIK) has been proposed to play a role in cytoskeletal organization and synaptic plasticity and has been linked, among others, to neurological disorders. However, target validation efforts for TNIK have been hampered by the limited kinase selectivity of small molecule probes and possible functional compensation in mouse models. Both issues are at least in part due to its close homology to the kinases MINK1 (or MAP4K6) and MAP4K4 (or HGK). As part of our interest in validating TNIK as a therapeutic target for neurological diseases, we set up a panel of biochemical and cellular assays, which are described herein. We then examined the activity of known amino-pyridine-based TNIK inhibitors (1, 3) and prepared structurally very close analogs that lack the ability to inhibit the target. We also developed a structurally orthogonal, naphthyridine-based TNIK inhibitor (9) and an inactive control molecule of the same chemical series. These validated small-molecule probes will enable dissection of the function of TNIK family in the context of human disease biology.


Assuntos
Proteínas Serina-Treonina Quinases/metabolismo , Esquizofrenia/genética , Fator 2 Associado a Receptor de TNF/metabolismo , Bioensaio , Humanos , Estrutura Molecular
8.
Proc Natl Acad Sci U S A ; 113(49): E7880-E7889, 2016 12 06.
Artigo em Inglês | MEDLINE | ID: mdl-27864515

RESUMO

Millions of individuals are infected with and die from tuberculosis (TB) each year, and multidrug-resistant (MDR) strains of TB are increasingly prevalent. As such, there is an urgent need to identify novel drugs to treat TB infections. Current frontline therapies include the drug isoniazid, which inhibits the essential NADH-dependent enoyl-acyl-carrier protein (ACP) reductase, InhA. To inhibit InhA, isoniazid must be activated by the catalase-peroxidase KatG. Isoniazid resistance is linked primarily to mutations in the katG gene. Discovery of InhA inhibitors that do not require KatG activation is crucial to combat MDR TB. Multiple discovery efforts have been made against InhA in recent years. Until recently, despite achieving high potency against the enzyme, these efforts have been thwarted by lack of cellular activity. We describe here the use of DNA-encoded X-Chem (DEX) screening, combined with selection of appropriate physical properties, to identify multiple classes of InhA inhibitors with cell-based activity. The utilization of DEX screening allowed the interrogation of very large compound libraries (1011 unique small molecules) against multiple forms of the InhA enzyme in a multiplexed format. Comparison of the enriched library members across various screening conditions allowed the identification of cofactor-specific inhibitors of InhA that do not require activation by KatG, many of which had bactericidal activity in cell-based assays.


Assuntos
Proteínas de Bactérias/antagonistas & inibidores , Mycobacterium tuberculosis/enzimologia , Oxirredutases/antagonistas & inibidores , Testes de Sensibilidade Microbiana , Bibliotecas de Moléculas Pequenas
9.
Biochem J ; 474(10): 1741-1754, 2017 05 09.
Artigo em Inglês | MEDLINE | ID: mdl-28302767

RESUMO

AMP-activated protein kinase (AMPK) plays a key role in integrating metabolic pathways in response to energy demand. AMPK activation results in a wide range of downstream responses, many of which are associated with improved metabolic outcome, making AMPK an attractive target for the treatment of metabolic diseases. AMPK is a heterotrimeric complex consisting of a catalytic subunit (α) and two regulatory subunits (ß and γ). The γ-subunit harbours the nucleotide-binding sites and plays an important role in AMPK regulation in response to cellular energy levels. In mammals, there are three isoforms of the γ-subunit and these respond differently to regulation by nucleotides, but there is limited information regarding their role in activation by small molecules. Here, we determined the effect of different γ-isoforms on AMPK by a direct activator, 991. In cells, 991 led to a greater activation of γ2-containing AMPK complexes compared with either γ1 or γ3. This effect was dependent on the long N-terminal region of the γ2-isoform. We were able to rule out an effect of Ser108 phosphorylation, since mutation of Ser108 to alanine in the ß2-isoform had no effect on activation of AMPK by 991 in either γ1- or γ2-complexes. The rate of dephosphorylation of Thr172 was slower for γ2- compared with γ1-complexes, both in the absence and presence of 991. Our studies show that activation of AMPK by 991 depends on the nature of the γ-isoform. This finding may have implications for the design of isoform-selective AMPK activators.


Assuntos
Proteínas Quinases Ativadas por AMP/metabolismo , Proteínas Quinases Ativadas por AMP/antagonistas & inibidores , Proteínas Quinases Ativadas por AMP/química , Proteínas Quinases Ativadas por AMP/genética , Regulação Alostérica/efeitos dos fármacos , Substituição de Aminoácidos , Aminopiridinas/farmacologia , Benzimidazóis/farmacologia , Benzoatos/farmacologia , Sítios de Ligação , Sistemas CRISPR-Cas , Ativação Enzimática/efeitos dos fármacos , Ativadores de Enzimas/farmacologia , Células HEK293 , Humanos , Indóis/farmacologia , Isoenzimas/antagonistas & inibidores , Isoenzimas/química , Isoenzimas/genética , Isoenzimas/metabolismo , Ligantes , Mutação , Fosforilação/efeitos dos fármacos , Processamento de Proteína Pós-Traducional/efeitos dos fármacos , Proteínas Recombinantes/química , Proteínas Recombinantes/metabolismo , Treonina/metabolismo
10.
Biochem J ; 474(17): 3059-3073, 2017 08 22.
Artigo em Inglês | MEDLINE | ID: mdl-28694351

RESUMO

AMP-activated protein kinase (AMPK) plays a major role in regulating metabolism and has attracted significant attention as a therapeutic target for treating metabolic disorders. AMPK activity is stimulated more than 100-fold by phosphorylation of threonine 172 (Thr172). Binding of AMP to the γ subunit allosterically activates the kinase. Additionally, many small molecules, e.g. 991, have been identified that bind between the kinase domain and the carbohydrate-binding module of the ß subunit, stabilising their interaction and leading to activation. It was reported recently that non-phosphorylated Thr172 AMPK is activated by AMP and A769662. We present here the crystal structure of non-phosphorylated Thr172 AMPK in complex with AMP and 991. This structure reveals that the activation loop, as well as the complex overall, is similar to the Thr172 phosphorylated complex. We find that in the presence of AMP and 991 non-phosphorylated Thr172, AMPK is much less active than the Thr172 phosphorylated enzyme. In human cells, the basal level of Thr172 phosphorylation is very low (∼1%), but is increased 10-fold by treatment with 2-deoxyglucose. In cells lacking the major Thr172 kinases, LKB1 and CaMKKß, Thr172 phosphorylation is almost completely abolished, and AMPK activity is virtually undetectable. Our data show that AMP and 991 binding to non-phosphorylated Thr172 AMPK can induce an ordered, active-like, conformation of the activation loop explaining how AMPK activity can be measured in vitro without Thr172 phosphorylation. However, in a cellular context, phosphorylation of Thr172 is critical for significant activation of AMPK.


Assuntos
Proteínas Quinases Ativadas por AMP/metabolismo , Quinase da Proteína Quinase Dependente de Cálcio-Calmodulina/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Células A549 , Quinases Proteína-Quinases Ativadas por AMP , Proteínas Quinases Ativadas por AMP/genética , Compostos de Bifenilo , Quinase da Proteína Quinase Dependente de Cálcio-Calmodulina/genética , Ativação Enzimática/efeitos dos fármacos , Ativação Enzimática/genética , Células HEK293 , Humanos , Fosforilação/efeitos dos fármacos , Fosforilação/genética , Proteínas Serina-Treonina Quinases/genética , Pironas/farmacologia , Tiofenos/farmacologia
11.
Nat Chem Biol ; 10(2): 96-8, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24292073

RESUMO

Pyridomycin, a natural product with potent antituberculosis activity, inhibits a major drug target, the InhA enoyl reductase. Here, we unveil the co-crystal structure and unique ability of pyridomycin to block both the NADH cofactor- and lipid substrate-binding pockets of InhA. This is to our knowledge a first-of-a-kind binding mode that discloses a new means of InhA inhibition. Proof-of-principle studies show how structure-assisted drug design can improve the activity of new pyridomycin derivatives.


Assuntos
Antituberculosos/química , Proteínas de Bactérias/química , NAD/química , Oligopeptídeos/química , Oxirredutases/química , Sítios de Ligação , Cristalografia por Raios X , Modelos Moleculares , Especificidade por Substrato
12.
Bioorg Med Chem Lett ; 26(1): 60-7, 2016 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-26614408

RESUMO

We have identified a class of azabenzimidazoles as potent and selective JAK1 inhibitors. Investigations into the SAR are presented along with the structural features required to achieve selectivity for JAK1 versus other JAK family members. An example from the series demonstrated highly selective inhibition of JAK1 versus JAK2 and JAK3, along with inhibition of pSTAT3 in vivo, enabling it to serve as a JAK1 selective tool compound to further probe the biology of JAK1 selective inhibitors.


Assuntos
Imidazóis/farmacologia , Janus Quinase 1/antagonistas & inibidores , Inibidores de Proteínas Quinases/farmacologia , Fator de Transcrição STAT3/antagonistas & inibidores , Animais , Ciclo Celular/efeitos dos fármacos , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Relação Dose-Resposta a Droga , Feminino , Humanos , Imidazóis/síntese química , Imidazóis/química , Janus Quinase 1/metabolismo , Camundongos , Camundongos Nus , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Fator de Transcrição STAT3/metabolismo , Relação Estrutura-Atividade
13.
Bioorg Med Chem Lett ; 25(24): 5743-7, 2015 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-26546219

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/metabolismo
14.
Antimicrob Agents Chemother ; 58(1): 61-70, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24126580

RESUMO

Moxifloxacin has shown excellent activity against drug-sensitive as well as drug-resistant tuberculosis (TB), thus confirming DNA gyrase as a clinically validated target for discovering novel anti-TB agents. We have identified novel inhibitors in the pyrrolamide class which kill Mycobacterium tuberculosis through inhibition of ATPase activity catalyzed by the GyrB domain of DNA gyrase. A homology model of the M. tuberculosis H37Rv GyrB domain was used for deciphering the structure-activity relationship and binding interactions of inhibitors with mycobacterial GyrB enzyme. Proposed binding interactions were later confirmed through cocrystal structure studies with the Mycobacterium smegmatis GyrB ATPase domain. The most potent compound in this series inhibited supercoiling activity of DNA gyrase with a 50% inhibitory concentration (IC50) of <5 nM, an MIC of 0.03 µg/ml against M. tuberculosis H37Rv, and an MIC90 of <0.25 µg/ml against 99 drug-resistant clinical isolates of M. tuberculosis. The frequency of isolating spontaneous resistant mutants was ∼10(-6) to 10(-8), and the point mutation mapped to the M. tuberculosis GyrB domain (Ser208 Ala), thus confirming its mode of action. The best compound tested for in vivo efficacy in the mouse model showed a 1.1-log reduction in lung CFU in the acute model and a 0.7-log reduction in the chronic model. This class of GyrB inhibitors could be developed as novel anti-TB agents.


Assuntos
Antituberculosos/farmacologia , Antituberculosos/uso terapêutico , Mycobacterium tuberculosis/patogenicidade , Tuberculose/tratamento farmacológico , Animais , Linhagem Celular , Humanos , Camundongos , Mycobacterium tuberculosis/efeitos dos fármacos , Relação Estrutura-Atividade
15.
J Med Chem ; 67(2): 864-884, 2024 01 25.
Artigo em Inglês | MEDLINE | ID: mdl-38197367

RESUMO

The DNA-encoded library (DEL) discovery platform has emerged as a powerful technology for hit identification in recent years. It has become one of the major parallel workstreams for small molecule drug discovery along with other strategies such as HTS and data mining. For many researchers working in the DEL field, it has become increasingly evident that many hits and leads discovered via DEL screening bind to target proteins with unique and unprecedented binding modes. This Perspective is our attempt to analyze reports of DEL screening with the purpose of providing a rigorous and useful account of the binding modes observed for DEL-derived ligands with a focus on binding mode novelty.


Assuntos
DNA , Bibliotecas de Moléculas Pequenas , Bibliotecas de Moléculas Pequenas/química , Ligantes , DNA/química , Descoberta de Drogas , Técnicas de Química Combinatória
16.
Bioorg Med Chem Lett ; 23(10): 3105-10, 2013 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-23562594

RESUMO

The discovery of the activating mutation V617F in the JH2 domain of Jak2 and the modulation of oncogenic Stat3 by Jak2 inhibitors have spurred a great interest in the inhibition of the Jak2/Stat pathway in oncology. In this Letter, we communicate the discovery of novel inhibitors of the Jak2/Stat5 axis, the N-(1H-pyrazol-3-yl)pyrimidin-2-amino derivatives. The rationale, synthesis and biological evaluation of these derivatives are reported. Two lead analogs from this series, 6 and 9, displayed prolonged residence time on Jak2, at enzymatic level. Although 6 and 9 exhibited moderate selectivity in a selected kinase panel, we chose to test these inhibitors in vivo as a consequence to their long residence time. However, extended inhibition of Jak2 due to the long residence time, in the form of inhibiting phosphorylation of downstream Stat5, was not recapitulated in an in vivo setting.


Assuntos
Descoberta de Drogas , Janus Quinase 2/antagonistas & inibidores , Inibidores de Proteínas Quinases/farmacologia , Fator de Transcrição STAT5/antagonistas & inibidores , Animais , Linhagem Celular Transformada , Proliferação de Células/efeitos dos fármacos , Cães , Relação Dose-Resposta a Droga , Feminino , Humanos , Janus Quinase 2/genética , Janus Quinase 2/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos , Modelos Moleculares , Conformação Molecular , Fosforilação/efeitos dos fármacos , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Ratos , Ratos Wistar , Fator de Transcrição STAT5/metabolismo , Relação Estrutura-Atividade , Especificidade por Substrato , Fatores de Tempo
17.
Bioorg Med Chem Lett ; 22(6): 2330-7, 2012 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-22342147

RESUMO

Checkpoint kinase 1 (Chk1, CHEK1) is a Ser/Thr protein kinase that plays a key role in mediating the cellular response to DNA-damage. Synthesis and evaluation of a previously described class of Chk1 inhibitors, triazoloquinolones/triazolones (TZs) is further described herein. Our investigation of structure-activity relationships led to the identification of potent inhibitors 14c, 14h and 16e. Key challenges included modulation of physicochemical properties and pharmacokinetic (PK) parameters to enable compound testing in a Chk1 specific hollow fiber pharmacodynamic model. In this model, 16e was shown to abrogate topotecan-induced cell cycle arrest in a dose dependent manner. The demonstrated activity of TZs in this model in combination with a chemotherapeutic agent as well as radiotherapy validates this series of Chk1 inhibitors. X-ray crystal structures (PDB code: 2YEX and 2YER) for an initial lead and an optimized analog are also presented.


Assuntos
Antineoplásicos/síntese química , Neoplasias do Colo/terapia , Inibidores de Proteínas Quinases/síntese química , Proteínas Quinases/metabolismo , Triazóis/síntese química , Animais , Antineoplásicos/farmacocinética , Antineoplásicos/uso terapêutico , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Quinase 1 do Ponto de Checagem , Neoplasias do Colo/enzimologia , Terapia Combinada , Cristalografia por Raios X , Dano ao DNA , Relação Dose-Resposta a Droga , Humanos , Camundongos , Camundongos Nus , Modelos Moleculares , Conformação Proteica , Inibidores de Proteínas Quinases/farmacocinética , Inibidores de Proteínas Quinases/uso terapêutico , Relação Estrutura-Atividade , Topotecan/farmacologia , Triazóis/farmacocinética , Triazóis/uso terapêutico , Ensaios Antitumorais Modelo de Xenoenxerto
19.
Drug Discov Today ; 27(4): 1088-1098, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-34728375

RESUMO

Dysregulation of the epigenome is associated with the onset and progression of several diseases, including cancer, autoimmune, cardiovascular, and neurological disorders. Members from the three families of epigenetic proteins (readers, writers, and erasers) have been shown to be druggable using small-molecule inhibitors. Increasing knowledge of the role of epigenetics in disease and the reversibility of these modifications explain why pharmacological intervention is an attractive strategy for tackling epigenetic-based disease. In this review, we provide an overview of epigenetics drug targets, focus on approaches used for initial hit identification, and describe the subsequent role of structure-guided chemistry optimisation of initial hits to clinical candidates. We also highlight current challenges and future potential for epigenetics-based therapies.


Assuntos
Epigênese Genética , Neoplasias , Descoberta de Drogas , Epigenômica , Humanos , Neoplasias/tratamento farmacológico
20.
Bioorg Med Chem Lett ; 21(8): 2207-11, 2011 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-21441027

RESUMO

Optimization of our bis-anilino-pyrimidine series of EphB4 kinase inhibitors led to the discovery of compound 12 which incorporates a key m-hydroxymethylene group on the C4 aniline. 12 displays a good kinase selectivity profile, good physical properties and pharmacokinetic parameters, suggesting it is a suitable candidate to investigate the therapeutic potential of EphB4 kinase inhibitors.


Assuntos
Compostos de Anilina/química , Álcool Benzílico/química , Inibidores de Proteínas Quinases/química , Pirimidinas/química , Receptor EphB4/antagonistas & inibidores , Administração Oral , Compostos de Anilina/síntese química , Compostos de Anilina/farmacocinética , Animais , Álcool Benzílico/síntese química , Álcool Benzílico/farmacocinética , Sítios de Ligação , Simulação por Computador , Cristalografia por Raios X , Avaliação Pré-Clínica de Medicamentos , Camundongos , Camundongos Nus , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/farmacocinética , Pirimidinas/síntese química , Pirimidinas/farmacocinética , Receptor EphB4/metabolismo , Relação Estrutura-Atividade
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