Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 618
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Eur J Med Chem ; 186: 111861, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31734025

RESUMO

Respiratory syncytial virus (RSV) and influenza A virus (IAV) are two of the most common viruses that cause substantial morbidity and mortality in infants, young children, elderly persons, and immunocompromised individuals worldwide. Currently, there are no licensed vaccines or selective antiviral drugs against RSV infections and most IAV strains become resistant to clinical anti-influenza drug. Here, we described the discovery of a series of 2-((1H-indol-3-yl)thio)-N-phenyl-acetamide as novel and potent RSV and IAV dual inhibitors. Thirty-five derivatives were designed, prepared, and evaluated for their anti-RSV and anti-IAV activities. Among the tested compounds, 14'c, 14'e, 14'f, 14'h, and 14'i exhibited excellent activity against both RSV and IAV, which showed low micromolar to sub-micromolar EC50 values. Further, compounds 14'c and 14'e were identified as the most promising dual inhibitors with lesser cytotoxicity than the clinical drug, ribavirin. These findings may contribute to the development of a lead compound for the treatment of RSV and/or IAV infections.


Assuntos
Acetamidas/farmacologia , Antivirais/farmacologia , Desenho de Drogas , Influenzavirus A/efeitos dos fármacos , Vírus Sincicial Respiratório Humano/efeitos dos fármacos , Acetamidas/síntese química , Acetamidas/química , Antivirais/síntese química , Antivirais/química , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Células HEK293 , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Relação Estrutura-Atividade , Replicação Viral/efeitos dos fármacos
2.
Eur J Med Chem ; 186: 111867, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31757525

RESUMO

Using the principle of bioisosteric replacement, we present a structure-based design approach to obtain new Axl kinase inhibitors with significant activity at the kinase and cellular levels. Through a stepwise structure-activity relationships exploration, a series of 6,7-disubstituted quinoline derivatives, which contain 1,3,4-oxadiazol acetamide moiety as novel Linker, were ultimately synthesized with Axl as the primary target. Most of them exhibited moderate to excellent activity, with IC50 values ranging from 0.032 to 1.54 µM against the tested cell lines. Among them, the most promising compound 47e, as an Axl kinase inhibitor (IC50 = 10 nM), shows remarkable cytotoxicity against A549, HT-29, PC-3, MCF-7, H1975 and MDA-MB-231 cell lines. More importantly, 47e also shows a significant inhibitory effect on EGFR-TKI resistant NSCLC cell lines H1975/gefitinib. Meanwhile, this study provides a novel type of linker for Axl kinase inhibitors, namely 1,3,4-oxadiazol acetamide moiety, which is out of the scope of the "5- atoms role ".


Assuntos
Acetamidas/farmacologia , Antineoplásicos/farmacologia , Desenho de Drogas , Oxidiazóis/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas/antagonistas & inibidores , Receptores Proteína Tirosina Quinases/antagonistas & inibidores , Acetamidas/síntese química , Acetamidas/química , 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 , Humanos , Estrutura Molecular , Oxidiazóis/síntese química , Oxidiazóis/química , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Proteínas Proto-Oncogênicas/metabolismo , Receptores Proteína Tirosina Quinases/metabolismo , Relação Estrutura-Atividade
3.
Eur J Med Chem ; 185: 111827, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31732256

RESUMO

Human African trypanosomiasis (HAT), caused by the parasitic protozoa Trypanosoma brucei, is one of the fatal diseases in tropical areas and current medicines are insufficient. Thus, development of new drugs for HAT is urgently needed. Leucyl-tRNA synthetase (LeuRS), a recently clinically validated antimicrobial target, is an attractive target for development of antitrypanosomal drugs. In this work, we report a series of α-phenoxy-N-sulfonylphenyl acetamides as T. brucei LeuRS inhibitors. The most potent compound 28g showed an IC50 of 0.70 µM which was 250-fold more potent than the starting hit compound 1. The structure-activity relationship was also discussed. These acetamides provided a new scaffold and lead compounds for the further development of clinically useful antitrypanosomal agents.


Assuntos
Acetamidas/farmacologia , Desenho de Drogas , Inibidores Enzimáticos/farmacologia , Leucina-tRNA Ligase/antagonistas & inibidores , Tripanossomicidas/farmacologia , Trypanosoma brucei brucei/efeitos dos fármacos , Acetamidas/síntese química , Acetamidas/química , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Leucina-tRNA Ligase/metabolismo , Estrutura Molecular , Testes de Sensibilidade Parasitária , Relação Estrutura-Atividade , Tripanossomicidas/síntese química , Tripanossomicidas/química , Trypanosoma brucei brucei/enzimologia
4.
Eur J Med Chem ; 185: 111866, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31734023

RESUMO

Introducing pyrimidine bases, the basic components of nucleic acid, to P2 ligands might enhance the potency of Human Immunodeficiency Virus-1 (HIV-1) protease inhibitors because of the carbonyl and amino groups promoting the formation of extensive hydrogen bonding interactions. In this work, we provide evidence that inhibitor 10e, with N-2-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl) acetamide as the P2 ligand and a 4-methoxylphenylsulfonamide as the P2' ligand, displayed remarkable enzyme inhibitory and antiviral activity, with the IC50 2.53 nM in vitro and a promising inhibition ratio with 68% against wild-type HIV-1 in vivo, with low cytotoxicity. This inhibitor also exhibited appreciable antiviral activity against DRV-resistant HIV-1 variants, which was of great value for further study.


Assuntos
Acetamidas/farmacologia , Aminas/farmacologia , Fármacos Anti-HIV/farmacologia , Protease de HIV/metabolismo , HIV-1/efeitos dos fármacos , Inibidores de Proteases/farmacologia , Pirimidinas/farmacologia , Acetamidas/síntese química , Acetamidas/química , Aminas/síntese química , Aminas/química , Fármacos Anti-HIV/síntese química , Fármacos Anti-HIV/química , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Células HEK293 , HIV-1/enzimologia , Humanos , Ligantes , Testes de Sensibilidade Microbiana , Estrutura Molecular , Inibidores de Proteases/síntese química , Inibidores de Proteases/química , Pirimidinas/síntese química , Pirimidinas/química , Relação Estrutura-Atividade
5.
Eur J Med Chem ; 185: 111874, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31735575

RESUMO

The fragment hopping approach is widely applied in drug development. A series of diarylpyrimidines (DAPYs) were obtained by hopping the thioacetamide scaffold to novel human immunodeficiency virus type 1 (HIV-1) nonnucleoside reverse transcriptase inhibitors (NNRTIs) to address the cytotoxicity issue of Etravirine and Rilpivirine. Although the new compounds (11a-l) in the first-round optimization possessed less potent anti-viral activity, they showed much lower cytotoxicity. Further optimization on the sulfur led to the sulfinylacetamide-DAPYs exhibiting improved anti-viral activity and a higher selectivity index especially toward the K103N mutant strain. The most potent compound 12a displayed EC50 values of 0.0249 µM against WT and 0.0104 µM against the K103N mutant strain, low cytotoxicity (CC50 > 221 µM) and a high selectivity index (SI WT > 8873, SI K103N > 21186). In addition, this compound showed a favorable in vitro microsomal stability across species. Computational study predicted the binding models of these potent compounds with HIV-1 reverse transcriptase thus providing further insights for new developments.


Assuntos
Acetamidas/farmacologia , Fármacos Anti-HIV/farmacologia , Transcriptase Reversa do HIV/antagonistas & inibidores , HIV-1/efeitos dos fármacos , Pirimidinas/farmacologia , Inibidores da Transcriptase Reversa/farmacologia , Acetamidas/síntese química , Acetamidas/química , Fármacos Anti-HIV/síntese química , Fármacos Anti-HIV/química , Relação Dose-Resposta a Droga , Descoberta de Drogas , Transcriptase Reversa do HIV/metabolismo , HIV-1/enzimologia , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Pirimidinas/síntese química , Pirimidinas/química , Inibidores da Transcriptase Reversa/síntese química , Inibidores da Transcriptase Reversa/química , Relação Estrutura-Atividade
6.
Biosci Biotechnol Biochem ; 84(1): 25-30, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31516064

RESUMO

The Japanese orange fly, Bactrocera tsuneonis, infests various citrus crops. While male pheromone components accumulated in the rectal glands are well characterized for Bactrocera, but information regarding the chemical factors involved in the life cycles of B. tsuneonis remains scarce. Herein, several volatile chemicals including a γ-decalactone, (3R,4R)-3-hydroxy-4-decanolide [(3R,4R)-HD], were identified as major components, along with acetamide and spiroketals as minor components in the rectal gland complexes of male B. tsuneonis flies. The lactone (3R,4R)-HD was also identified in female rectal gland complexes. The amount of this compound in mature males was significantly higher than those observed in females and immature males. The lactone (3R,4R)-HD was detected in flies fed with sucrose only, indicating that this lactone is not derived from dietary sources during adulthood, but biosynthesized in vivo. The predominant accumulation of (3R,4R)-HD in mature males also suggests a possible role in reproductive behavior.


Assuntos
Lactonas/química , Glândula de Sal/química , Tephritidae/fisiologia , Acetamidas/síntese química , Acetamidas/química , Animais , Cromatografia Gasosa , Citrus , Dieta , Feminino , Furanos/síntese química , Furanos/química , Japão , Lactonas/síntese química , Masculino , Espectrometria de Massas , Reprodução/fisiologia , Atrativos Sexuais/química , Comportamento Sexual Animal/fisiologia , Compostos de Espiro/síntese química , Compostos de Espiro/química , Sacarose
7.
Eur J Med Chem ; 183: 111699, 2019 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-31561045

RESUMO

The recent burst of explorations on heat shock protein 90 (HSP90) in virus research supports its emergence as a promising target to overcome the drawbacks of current antiviral therapeutic regimen. In continuation of our efforts towards the discovery of novel anti-retroviral molecules, we designed, synthesized fifteen novels 2-isoxazol-3-yl-acetamide based compounds (2a-o) followed by analysis of their anti-HIV activity and cytotoxicity studies. 2a-b, 2e, 2j, and 2l-m were found to be active with inhibitory potentials >80% at their highest non-cytotoxic concentration (HNC). Further characterization of anti-HIV activity of these molecules suggests that 2l has ∼3.5 fold better therapeutic index than AUY922, the second generation HSP90 inhibitor. The anti-HIV activity of 2l is a cell type, virus isolate and viral load independent phenomena. Interestingly, 2l does not significantly modulate viral enzymes like Reverse Transcriptase (RT), Integrase (IN) and Protease (PR) as compared to their known inhibitors in a cell free in vitro assay system at its HNC. Further, 2l mediated inhibition of HSP90 attenuates HIV-1 LTR driven gene expression. Taken together, structural rationale, modeling studies and characterization of biological activities suggest that this novel scaffold can attenuate HIV-1 replication significantly within the host and thus opens a new horizon to develop novel anti-HIV therapeutic candidates.


Assuntos
Acetamidas/farmacologia , Androstenóis/farmacologia , Fármacos Anti-HIV/farmacologia , Descoberta de Drogas , HIV-1/efeitos dos fármacos , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Acetamidas/síntese química , Acetamidas/química , Androstenóis/síntese química , Androstenóis/química , Fármacos Anti-HIV/síntese química , Fármacos Anti-HIV/química , Relação Dose-Resposta a Droga , HIV-1/metabolismo , Proteínas de Choque Térmico HSP90/metabolismo , Testes de Sensibilidade Microbiana , Estrutura Molecular , Relação Estrutura-Atividade , Replicação Viral/efeitos dos fármacos
8.
Org Biomol Chem ; 17(33): 7694-7705, 2019 09 07.
Artigo em Inglês | MEDLINE | ID: mdl-31328213

RESUMO

Membranous organelles are major endogenous sources of reactive oxygen and nitrogen species. When present at high levels, these species can cause macromolecular damage and disease. To better detect and scavenge free radical forms of the reactive species at their sources, we investigated whether nitrone spin traps could be selectively targeted to intracellular membranes using a bioorthogonal imaging approach. Electron paramagnetic resonance imaging demonstrated that the novel cyclic nitrone 5-dodecylcarbamoyl-5-N-dodecylacetamide-1-pyroline-N-oxide (diC12PO) could be used to target the nitrone moiety to liposomes composed of phosphatidyl choline. To test localization with authentic membranes in living cells, fluorophores were introduced via strain-promoted alkyne-nitrone cycloaddition (SPANC). Two fluorophore-conjugated alkynes were investigated: hexynamide-fluoresceine (HYA-FL) and dibenzylcyclooctyne-PEG4-5/6-sulforhodamine B (DBCO-Rhod). Computational and mass spectrometry experiments confirmed the cycloadduct formation of DBCO-Rhod (but not HYA-FL) with diC12PO in cell-free solution. Confocal microscopy of bovine aortic endothelial cells treated sequentially with diC12PO and DBCO-Rhod demonstrated clear localization of fluorescence with intracellular membranes. These results indicate that targeting of nitrone spin traps to cellular membranes is feasible, and that a bioorthogonal approach can aid the interrogation of their intracellular compartmentalization properties.


Assuntos
Acetamidas/química , Teoria da Densidade Funcional , Fluorescência , Imagem Óptica , Acetamidas/síntese química , Animais , Bovinos , Células Cultivadas , Espectroscopia de Ressonância de Spin Eletrônica , Estrutura Molecular
9.
Eur J Med Chem ; 180: 134-142, 2019 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-31302446

RESUMO

In order to expand the arsenal of biologically active substances of anticonvulsive action by the interaction of 2-(2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl)acetic acid with the corresponding amines in the presence of N,N'-carbonyldiimidazole in the dioxane medium, a systematic series of 2-(2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl)-N-R-acetamides was obtained. A novel approach to synthesis of the key intermediate - 2-(2,4-dioxo-1,4-dihydro-quinazolin-3(2H)-yl)acetic acid was developed. The structure and purity of the resulting substances was confirmed by elemental analysis, 1H NMR, 13C NMR spectroscopy and LC/MS. Based on the results of docking studies using SCIGRESS software, selected compounds with the best affinity for anticonvulsant protein biomes (PDB codes: 4COF, 3F8E and 1 EOU) are promising for experimental studies of anticonvulsant activity. A comparative analysis of the results of molecular docking and in vivo results suggests that there is a positive correlation between scoring protein inhibition and experimental data. Pharmacological studies have revealed the leader compound 2-(2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl)-N-[(2,4-dichlorophenyl)methyl]acet-amide, which improved all the experimental convulsive syndrome rates in mice without motor coordination impairment and may be recommended for further research. The lowest values of the scoring function of the ligand-peptide interaction are obtained for the synthesized compound and сarbonic anhydrase II (gene name CA2) (PDB code 1 EOU), so its inhibition is proposed by us as the most probable mechanism of the anticonvulsive effect of the leader compound.


Assuntos
Acetamidas/farmacologia , Anticonvulsivantes/farmacologia , Quinolinas/farmacologia , Convulsões/tratamento farmacológico , Acetamidas/síntese química , Acetamidas/química , Animais , Anticonvulsivantes/síntese química , Anticonvulsivantes/química , Relação Dose-Resposta a Droga , Feminino , Masculino , Camundongos , Testes de Sensibilidade Microbiana , Simulação de Acoplamento Molecular , Estrutura Molecular , Quinolinas/síntese química , Quinolinas/química , Relação Estrutura-Atividade
10.
Arch Pharm (Weinheim) ; 352(7): e1800310, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31125474

RESUMO

Sixteen novel coumarin-based compounds are reported as potent acetylcholinesterase (AChE) inhibitors. The most active compound in this series, 5a (IC50 0.04 ± 0.01 µM), noncompetitively inhibited AChE with a higher potency than tacrine and galantamine. Compounds 5d, 5j, and 5 m showed a moderate antilipid peroxidation activity. The compounds showed cytotoxicity in the same range as the standard drugs in HEK-293 cells. Molecular docking demonstrated that 5a acted as a dual binding site inhibitor. The coumarin moiety occupied the peripheral anionic site and showed π-π interaction with Trp278. The tertiary amino group displayed significant cation-π interaction with Phe329. The aromatic group showed π-π interaction with Trp83 at the catalytic anionic site. The long chain of methylene lay along the gorge interacting with Phe330 via hydrophobic interaction. Molecular docking was applied to postulate the selectivity toward AChE of 5a in comparison with donepezil and tacrine. Structural insights into the selectivity of the coumarin derivatives toward huAChE were explored by molecular docking and 3D QSAR and molecular dynamics simulation for 20 ns. ADMET analysis suggested that the 2-(2-oxo-2H-chromen-4-yl)acetamides showed a good pharmacokinetic profile and no hepatotoxicity. These coumarin derivatives showed high potential for further development as anti-Alzheimer agents.


Assuntos
Acetamidas/farmacologia , Inibidores da Colinesterase/farmacologia , Acetamidas/síntese química , Acetamidas/química , Acetilcolinesterase/metabolismo , Sítios de Ligação/efeitos dos fármacos , Butirilcolinesterase/metabolismo , Inibidores da Colinesterase/síntese química , Inibidores da Colinesterase/química , Relação Dose-Resposta a Droga , Células HEK293 , Humanos , Cinética , Ácido Linoleico/antagonistas & inibidores , Ácido Linoleico/metabolismo , Modelos Moleculares , Relação Quantitativa Estrutura-Atividade
11.
Bioorg Med Chem Lett ; 29(6): 791-796, 2019 03 15.
Artigo em Inglês | MEDLINE | ID: mdl-30718161

RESUMO

The present study describes the discovery and characterization of a series of 5-aryl-2H-tetrazol-3-ylacetamides as G protein-gated inwardly-rectifying potassium (GIRK) channels activators. Working from an initial hit discovered during a high-throughput screening campaign, we identified a tetrazole scaffold that shifts away from the previously reported urea-based scaffolds while remaining effective GIRK1/2 channel activators. In addition, we evaluated the compounds in Tier 1 DMPK assays and have identified a (3-methyl-1H-pyrazol-1-yl)tetrahydrothiophene-1,1-dioxide head group that imparts interesting and unexpected microsomal stability compared to previously-reported pyrazole head groups.


Assuntos
Acetamidas/farmacologia , Descoberta de Drogas , Canais de Potássio Corretores do Fluxo de Internalização Acoplados a Proteínas G/agonistas , Pirazóis/farmacologia , Tetrazóis/farmacologia , Acetamidas/síntese química , Acetamidas/química , Animais , Células HEK293 , Humanos , Camundongos , Microssomos Hepáticos/metabolismo , Estrutura Molecular , Pirazóis/síntese química , Pirazóis/química , Relação Estrutura-Atividade , Tetrazóis/síntese química , Tetrazóis/química
12.
Nat Chem Biol ; 15(3): 250-258, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30643284

RESUMO

Irreversible inhibition of disease-associated proteins with small molecules is a powerful approach for achieving increased and sustained pharmacological potency. Here, we introduce α-chlorofluoroacetamide (CFA) as a novel warhead of targeted covalent inhibitor (TCI). Despite weak intrinsic reactivity, CFA-appended quinazoline showed high reactivity toward Cys797 of epidermal growth factor receptor (EGFR). In cells, CFA-quinazoline showed higher target specificity for EGFR than the corresponding Michael acceptors in a wide concentration range (0.1-10 µM). The cysteine adduct of the CFA derivative was susceptible to hydrolysis and reversibly yielded intact thiol but was stable in solvent-sequestered ATP-binding pocket of EGFR. This environment-dependent hydrolysis can potentially reduce off-target protein modification by CFA-based drugs. Oral administration of CFA quinazoline NS-062 significantly suppressed tumor growth in a mouse xenograft model. Further, CFA-appended pyrazolopyrimidine irreversibly inhibited Bruton's tyrosine kinase with higher target specificity. These results demonstrate the utility of CFA as a new class warheads for TCI.


Assuntos
Acetamidas/síntese química , Cisteína/metabolismo , Quinazolinas/síntese química , Acetamidas/química , Acetamidas/farmacologia , Animais , Antineoplásicos , Linhagem Celular , Receptores ErbB , Humanos , Camundongos , Camundongos Nus , Neoplasias , Fosfotransferases/fisiologia , Inibidores de Proteínas Quinases/metabolismo , Inibidores de Proteínas Quinases/farmacologia , Pirimidinas/antagonistas & inibidores , Quinazolinas/química , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de Xenoenxerto
13.
Bioorg Med Chem ; 27(5): 777-784, 2019 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-30692023

RESUMO

A simple and one-pot approach for the synthesis of highly functionalized novel (E)-2-benzylideno-(Z)-carbazolylideno cyanoacetamide derivatives from different 2-(2',3',4',9'-tetrahydro-carbazol-1'-ylidene)-propanedinitriles and aryl/heteroaryl carbaldehydes via vinylogous aldol reaction. The structures of the molecules were designated by FT-IR, 1H NMR, 13C NMR studies, elemental and X-ray crystallographic analysis. The synthesized pure products have been screened for in vitro antibiofilm inhibitory activity towards antibiotic-resistant pathogenic organisms. All the synthesized compounds showed biofilm inhibition. Promisingly, the moieties 3a, 3d and 3h showed higher antibiofilm activity at biofilm inhibitory concentration (BIC) (200 µg/mL) against bacterial pathogens. Among the three moieties, 3a showed high prospective against E. coli biofilm with minimal and maximal BIC percentage of 32% (10 µg/mL) and 89% (100 µg/mL) and chosen lowest BIC for further evaluation. Also, the 3a generate ROS two fold at 1 h treatment in E. coli biofilm. The 3a exhibited no toxic effect on cell viability upto 75 µg/mL in HEK293 cell lines. The results of the present study reveal that among (E)-2-benzylideno-(Z)-carbazolylideno cyanoacetamides, (E)-2-benzylideno-6-methyl-2,3,4,9-tetrahydro-1H-carbazol-(Z)-α-carbamino-α-cyano-1-ylidene (3a) could be exploited as an excellent antibiofilm agent against carbapenem-resistant E. coli bacteria strains.


Assuntos
Acetamidas/farmacologia , Antibacterianos/farmacologia , Biofilmes/efeitos dos fármacos , Carbazóis/farmacologia , Acetamidas/síntese química , Acetamidas/toxicidade , Antibacterianos/síntese química , Antibacterianos/toxicidade , Bacillus megaterium/efeitos dos fármacos , Bacillus subtilis/efeitos dos fármacos , Carbazóis/síntese química , Carbazóis/toxicidade , Bactérias Gram-Negativas/efeitos dos fármacos , Células HEK293 , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Relação Estrutura-Atividade
14.
ChemMedChem ; 14(5): 527-531, 2019 03 05.
Artigo em Inglês | MEDLINE | ID: mdl-30667174

RESUMO

While the ribosome is a common target for antibiotics, challenges with crystallography can impede the development of new bioactives using structure-based drug design approaches. In this study we exploit common structural features present in linezolid-resistant forms of both methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) to redesign the antibiotic. Enabled by rapid and facile cryoEM structures, this process has identified (S)-2,2-dichloro-N-((3-(3-fluoro-4-morpholinophenyl)-2-oxooxazolidin-5-yl)methyl)acetamide (LZD-5) and (S)-2-chloro-N-((3-(3-fluoro-4-morpholinophenyl)-2-oxooxazolidin-5-yl)methyl) acetamide (LZD-6), which inhibit the ribosomal function and growth of linezolid-resistant MRSA and VRE. The strategy discussed highlights the potential for cryoEM to facilitate the development of novel bioactive materials.


Assuntos
Acetamidas/síntese química , Acetamidas/farmacologia , Antibacterianos/síntese química , Antibacterianos/farmacologia , Sítios de Ligação , Cristalografia por Raios X , Desenho de Drogas , Linezolida/farmacologia , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Modelos Moleculares , Estrutura Molecular , Ribossomos/metabolismo , Infecções Estafilocócicas/tratamento farmacológico , Relação Estrutura-Atividade , Enterococos Resistentes à Vancomicina/efeitos dos fármacos
15.
Drug Res (Stuttg) ; 69(2): 111-120, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30086567

RESUMO

In this study, a new series of sulfonamides derivatives was synthesized and their inhibitory effects on DPPH and jack bean urease were evaluated. The in silico studies were also applied to ascertain the interactions of these molecules with active site of the enzyme. Synthesis was initiated by the nucleophilic substitution reaction of 2-(4-methoxyphenyl)-1-ethanamine (1: ) with 4-(acetylamino)benzenesulfonyl chloride (2): in aqueous sodium carbonate at pH 9. Precipitates collected were washed and dried to obtain the parent molecule, N-(4-{[(4-methoxyphenethyl)amino]sulfonyl}phenyl)acetamide (3): . Then, this parent was reacted with different alkyl/aralkyl halides, (4A-M: ), using dimethylformamide (DMF) as solvent and LiH as an activator to produce a series of new N-(4-{[(4-methoxyphenethyl)-(substituted)amino]sulfonyl}phenyl)acetamides (5A-M: ). All the synthesized compounds were characterized by IR, EI-MS, 1H-NMR, 13C-NMR and CHN analysis data. All of the synthesized compounds showed higher urease inhibitory activity than the standard thiourea. The compound 5 F: exhibited very excellent enzyme inhibitory activity with IC50 value of 0.0171±0.0070 µM relative to standard thiourea having IC50 value of 4.7455±0.0546 µM. Molecular docking studies suggested that ligands have good binding energy values and bind within the active region of taget protein. Chemo-informatics properties were evaluated by computational approaches and it was found that synthesized compounds mostly obeyed the Lipinski' rule.


Assuntos
Acetamidas/farmacologia , Inibidores Enzimáticos/farmacologia , Depuradores de Radicais Livres/farmacologia , Sulfonamidas/farmacologia , Urease/antagonistas & inibidores , Acetamidas/síntese química , Compostos de Bifenilo/química , Compostos de Bifenilo/metabolismo , Canavalia , Ensaios Enzimáticos/métodos , Inibidores Enzimáticos/síntese química , Depuradores de Radicais Livres/síntese química , Concentração Inibidora 50 , Simulação de Acoplamento Molecular , Estresse Oxidativo/efeitos dos fármacos , Picratos/química , Picratos/metabolismo , Proteínas de Plantas/antagonistas & inibidores , Proteínas de Plantas/química , Proteínas de Plantas/metabolismo , Relação Estrutura-Atividade , Sulfonamidas/síntese química , Urease/química , Urease/metabolismo
16.
Med Chem ; 15(3): 231-239, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30324890

RESUMO

BACKGROUND: Cancer is an important cause of human death worldwide. During the last decades, many anticancer agents with anti-tubulin mechanism have been synthesized or extracted from nature and some of them also entered clinical use. Indibulin is one of the most potent tubulin polymerization inhibitors with minimal peripheral neuropathy, which is a big problem by some of the antimitotic agents such as taxanes and vinka alkaloids. With respect to this giant benefit, herein we decided to design and synthesize novel indibulin related compounds and investigate their anticancer activity against HT-29, Caco-2 and T47-D cancerous cell lines as well as NIH-T3T as normal cell line. OBJECTIVE: The aim of this study was to synthesize new anti-cancer agents and evaluates their cytotoxic activity on diverse cancerous and normal cell lines. METHOD: Target compounds were synthesized in multistep reaction and cytotoxic activity was investigated by MTT cell viability assay. RESULTS: Herein, nine novel target compounds were synthesized in moderate to good yield. Some of the compounds exerted good cytotoxic activity against cancerous cell lines. Annexin V/PI staining showed that compound 4g could induce apoptosis and necrosis in HT-29 cell line. CONCLUSION: It is valuable to do further investigation on compound 4g which showed the highest activity against HT-29 and Caco-2 (IC50 values are 6.9 and 7 µM respectively). Also, synthesis of new derivatives of current synthesized compounds is suggested.


Assuntos
Acetamidas/química , Acetamidas/farmacologia , Antineoplásicos/química , Antineoplásicos/farmacologia , Desenho de Drogas , Indóis/química , Indóis/farmacologia , Acetamidas/síntese química , Antineoplásicos/síntese química , Linhagem Celular Tumoral , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Indóis/síntese química , Concentração Inibidora 50 , Espectroscopia de Prótons por Ressonância Magnética , Análise Espectral/métodos
17.
J Antibiot (Tokyo) ; 72(2): 118-121, 2019 02.
Artigo em Inglês | MEDLINE | ID: mdl-30449891

RESUMO

Thirteen azolylthioacetamides was synthesized and characterized. Biological activity assays with MßLs revealed that all of these compounds (except 3 and 6) gained exhibited inhibitory activity on NDM-1, with an IC50 value ranging from 3.8 to 26.4 µM. Inhibitors 11 and 13, in combination with cefazolin, resulted in a four-fold decrease in MIC of the antibiotic against Escherichia coli cells expressing NDM-1. Docking studies revealed that the inhibitors 7, 9, and 13 bound to active site of NDM-1.


Assuntos
Acetamidas/farmacologia , Antibacterianos/farmacologia , Cefazolina/farmacologia , Escherichia coli/metabolismo , beta-Lactamases/metabolismo , Acetamidas/síntese química , Escherichia coli/genética , Testes de Sensibilidade Microbiana
18.
Bioorg Med Chem Lett ; 29(2): 138-142, 2019 01 15.
Artigo em Inglês | MEDLINE | ID: mdl-30551904

RESUMO

By further optimizing compound A [2'-fluoro-N-methyl-[1,1'-biphenyl]-2-sulfonamide], we identified DSP-0565 [2-(2'-fluoro-[1,1'-biphenyl]-2-yl)acetamide, 17a] as a strong, broad-spectrum anti-epileptic drug (AED) candidate. Our efforts mainly focused on finding an alternative polar group for the sulfonamide in order to improve ADME profile of compound A including good metabolic stability and no reactive metabolic production. This led to the identification of biphenyl acetamide as a new scaffold for development of broad-spectrum AED candidates. DSP-0565 showed anti-convulsant activity in various models (scPTZ, MES, 6 Hz and amygdala kindling) with good safety margin, and was therefore selected as a clinical candidate.


Assuntos
Acetamidas/uso terapêutico , Tonsila do Cerebelo/efeitos dos fármacos , Anticonvulsivantes/uso terapêutico , Compostos de Bifenilo/uso terapêutico , Epilepsia/tratamento farmacológico , Excitação Neurológica/efeitos dos fármacos , Acetamidas/síntese química , Acetamidas/química , Tonsila do Cerebelo/patologia , Animais , Anticonvulsivantes/síntese química , Anticonvulsivantes/química , Compostos de Bifenilo/síntese química , Compostos de Bifenilo/química , Relação Dose-Resposta a Droga , Epilepsia/patologia , Excitação Neurológica/patologia , Estrutura Molecular , Ratos , Relação Estrutura-Atividade
19.
Eur J Med Chem ; 160: 245-255, 2018 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-30347323

RESUMO

Anoctamin 1 (ANO1), a calcium-activated chloride channel, is highly expressed and amplified in a number of carcinomas including breast, pancreatic and prostate cancers. Downregulation of ANO1 expression and function significantly inhibits cell proliferation, migration, and invasion of various cancer cell lines. Development of potent and selective ANO1 inhibitors is currently desirable, which may provide a new strategy for cancer treatment. Our previous study revealed a new class of ANO1 inhibitor, (E)-2-(4-chloro-2-methylphenoxy)-N'-(2-methoxybenzylidene)acetohydrazide (Ani9) and structural optimization via chemical modification of Ani9 basic skeleton was undertaken for the development of more potent and specific inhibitors of ANO1. Structure-activity relationship studies with newly synthesized derivatives revealed a number of potent ANO1 inhibitors, among which 5f is the most potent inhibitor with an IC50 value of 22 nM. The selectivity analyses showed that 5f has excellent selectivity to ANO1 (>1000-fold over ANO2). In cellular assays, 5f significantly inhibited cell proliferation of PC3, MCF7, and BxPC3 cells expressing high levels of ANO1. In addition, 5f strongly reduced the protein levels of ANO1 in PC3 cells. This study will be useful in the development of ANO1 inhibitors for treatment of cancer and other ANO1-related diseases.


Assuntos
Acetamidas/farmacologia , Anoctamina-1/antagonistas & inibidores , Antineoplásicos/farmacologia , Hidrazonas/farmacologia , Proteínas de Neoplasias/antagonistas & inibidores , Acetamidas/síntese química , Acetamidas/química , Animais , Anoctamina-1/metabolismo , Antineoplásicos/síntese química , Antineoplásicos/química , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Hidrazonas/síntese química , Hidrazonas/química , Estrutura Molecular , Proteínas de Neoplasias/metabolismo , Ratos , Relação Estrutura-Atividade , Células Tumorais Cultivadas
20.
Cell Death Dis ; 9(11): 1066, 2018 10 18.
Artigo em Inglês | MEDLINE | ID: mdl-30337519

RESUMO

Polo-like kinase 4 (PLK4) is indispensable for precise control of centriole duplication. Abnormal expression of PLK4 has been reported in many human cancers, and inhibition of PLK4 activity results in their mitotic arrest and apoptosis. Therefore, PLK4 may be a valid therapeutic target for antitumor therapy. However, clinically available small-molecule inhibitors targeting PLK4 are deficient and their underlying mechanisms still remain not fully clear. Herein, the effects of YLT-11 on breast cancer cells and the associated mechanism were investigated. In vitro, YLT-11 exhibited significant antiproliferation activities against breast cancer cells. Meanwhile, cells treated with YLT-11 exhibited effects consistent with PLK4 kinase inhibition, including dysregulated centriole duplication and mitotic defects, sequentially making tumor cells more vulnerable to chemotherapy. Furthermore, YLT-11 could strongly regulate downstream factors of PLK4, which was involved in cell cycle regulation, ultimately inducing apoptosis of breast cancer cell. In vivo, oral administration of YLT-11 significantly suppressed the tumor growth in human breast cancer xenograft models at doses that are well tolerated. In summary, the preclinical data show that YLT-11 could be a promising candidate drug for breast tumor therapy.


Assuntos
Acetamidas/farmacologia , Antineoplásicos/farmacologia , Neoplasias da Mama/tratamento farmacológico , Centríolos/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica , Inibidores de Proteínas Quinases/farmacologia , Proteínas Serina-Treonina Quinases/genética , Acetamidas/síntese química , Antineoplásicos/síntese química , Neoplasias da Mama/enzimologia , Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Proteína Quinase CDC2/genética , Proteína Quinase CDC2/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Centríolos/patologia , Centríolos/ultraestrutura , Inibidor de Quinase Dependente de Ciclina p21/genética , Inibidor de Quinase Dependente de Ciclina p21/metabolismo , Avaliação Pré-Clínica de Medicamentos , Feminino , Humanos , Indazóis/síntese química , Indazóis/farmacologia , Células MCF-7 , Mitose/efeitos dos fármacos , Simulação de Acoplamento Molecular , Inibidores de Proteínas Quinases/síntese química , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Proteínas Serina-Treonina Quinases/química , Proteínas Serina-Treonina Quinases/metabolismo , Pirimidinas/síntese química , Pirimidinas/farmacologia , RNA Interferente Pequeno/genética , RNA Interferente Pequeno/metabolismo , Transdução de Sinais , Análise de Sobrevida , Carga Tumoral/efeitos dos fármacos , Ensaios Antitumorais Modelo de Xenoenxerto , Fosfatases cdc25/genética , Fosfatases cdc25/metabolismo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA