Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 2.590
Filtrar
1.
J Enzyme Inhib Med Chem ; 35(1): 549-554, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31967484

RESUMO

A small series of 2,4-dioxothiazolidinyl acetic acids was prepared from thiourea, chloroacetic acid, aromatic aldehydes, and ethyl-2-bromoacetate. They were assayed for the inhibition of four physiologically relevant carbonic anhydrase (CA, EC 4.2.1.1) isoforms of human (h) origin, the cytosolic hCA I and II, and the transmembrane hCA IX and XII, involved among others in tumorigenesis (hCA IX and XII) and glaucoma (hCA II and XII). The two cytosolic isoforms were not inhibited by these carboxylates, which were also rather ineffective as hCA IX inhibitors. On the other hand, they showed submicromolar hCA XII inhibition, with KIs in the range of 0.30-0.93 µM, making them highly CA XII-selective inhibitors.


Assuntos
Acetatos/farmacologia , Anidrase Carbônica IX/antagonistas & inibidores , Inibidores da Anidrase Carbônica/classificação , Inibidores da Anidrase Carbônica/farmacologia , Anidrases Carbônicas/metabolismo , Tiazóis/farmacologia , Acetatos/síntese química , Acetatos/química , Antígenos de Neoplasias/metabolismo , Anidrase Carbônica IX/metabolismo , Inibidores da Anidrase Carbônica/síntese química , Inibidores da Anidrase Carbônica/química , Relação Dose-Resposta a Droga , Humanos , Estrutura Molecular , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
2.
Eur J Med Chem ; 186: 111879, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31780082

RESUMO

Adenosine acts as a powerful signaling molecule via four distinct G protein-coupled receptors, designated A1, A2A, A2B and A3 adenosine receptors (ARs). A2A and A2B ARs are Gs-coupled, while A1 and A3 ARs inhibit cAMP production via Gi proteins. Antagonists for A1 and A3 ARs may be useful for the treatment of (neuro)inflammatory diseases including acute kidney injury and kidney failure, pulmonary diseases, and Alzheimer's disease. In the present study, we optimized the versatile 2-amino-4-phenylthiazole scaffold by introducing substituents at N2 and C5 to obtain A1 and A3 AR antagonists including dual-target compounds. Selective A1 antagonists with (sub)nanomolar potency were produced, e.g. 11 and 13. These compounds showed species differences being significantly more potent at the rat as compared to the human A1 AR, and were characterized as inverse agonists. Several potent and selective A3 AR antagonists, e.g. 7, 8, 17 and 22 (Ki values of 5-9 nM at the human A3 AR) were prepared, which were much less potent at the rat orthologue. Moreover, dual A1/A3 antagonists (10, 18) were developed showing Ki values between 8 and 42 nM. Docking and molecule dynamic simulation studies using the crystal structure of the A1 AR and a homology model of the A3 AR were performed to rationalize the observed structure-activity relationships.


Assuntos
Antagonistas de Receptores Purinérgicos P1/farmacologia , Receptor A1 de Adenosina/metabolismo , Receptor A3 de Adenosina/metabolismo , Tiazóis/farmacologia , Relação Dose-Resposta a Droga , Humanos , Modelos Moleculares , Estrutura Molecular , Antagonistas de Receptores Purinérgicos P1/síntese química , Antagonistas de Receptores Purinérgicos P1/química , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
3.
Eur J Med Chem ; 185: 111806, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31677446

RESUMO

In this work, 35 new derivatives of betulonic, dihydrobetulonic and ursonic acid were prepared including 30 aminothiazoles and all of them were tested for their in vitro cytotoxic activity in eight cancer cell lines and two non-cancer fibroblasts. Compounds with the IC50 below 5 µM in CCRF-CEM cells and low toxicity in non-cancer fibroblasts (4m, 5c, 5m, 6c, 6m, 7b, and 7c) were further subjected to tests of pharmacological parameters yielding the final set for advanced biological evaluation (4m, 5m, 6m, and 7b). It was proved by several methods, that all of them trigger apoptosis via the intrinsic pathway and derivatives 5m and 7b are the most effective (IC50 2.4 µM and 3.6 µM). They are the best candidates to become potentially new anticancer drugs and will be subjected to in vivo tests in mice. In addition, compounds 6b and 6c deserve more attention because their activity is not limited only to chemosensitive CCRF-CEM cell line. Specifically, compound 6b is highly active against K562 leukemic cell line (0.7 µM) and its IC50 activity in colon cancer HCT116 cell line is 1.0 µM. Compound 6c is active in both normal K562 and resistant K562-TAX cell lines (IC50 3.4 µM and 5.4 µM) and both colon cancer cell lines (HCT116 and HCT116p53-/-, IC50 3.5 µM and 3.4 µM).


Assuntos
Antineoplásicos/farmacologia , Ácido Oleanólico/análogos & derivados , Terpenos/farmacologia , Tiazóis/farmacologia , Triterpenos/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/química , Apoptose/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Fibroblastos/efeitos dos fármacos , Humanos , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Microssomos/química , Microssomos/metabolismo , Estrutura Molecular , Ácido Oleanólico/química , Ácido Oleanólico/farmacologia , Relação Estrutura-Atividade , Terpenos/síntese química , Terpenos/química , Tiazóis/síntese química , Tiazóis/química , Triterpenos/química
4.
Eur J Med Chem ; 185: 111784, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31669850

RESUMO

A new series of thiazole-2(3H)-thiones containing 4-(3,4,5-trimethoxyphenyl) moiety were synthesized as diaryl-heterocylic analogs of combretastatin A-4 with anticancer activity. The cytotoxicity evaluation of synthesized compounds against cancer cell lines (A549, MCF-7 and SKOV3) revealed that most of them had potent cytotoxic activity toward all tested cell lines (IC50s < 10 µg/mL). Among them, 3-(chlorobenzyl) derivatives 5c and 5d showed the best inhibitory effect on MCF-7 cells (IC50 values of 1.14 and 2.41 µg/mL, respectively). Furthermore, the ability of tubulin polymerization inhibition and apoptosis induction were evaluated for the promising compounds 5c and 5d. Results suggested that these compounds remarkably inhibit tubulin polymerization and induce apoptosis resulting in cell death. In vitro studies revealed that these compounds had no significant cytotoxicity against normal cells at the concentrations required for growth inhibition of cancer cells. In vitro biding assay and in silico docking study also confirmed the binding of prototype compound to the colchicine binding site of tubulin.


Assuntos
Antineoplásicos/farmacologia , Tiazóis/farmacologia , Tionas/farmacologia , Moduladores de Tubulina/farmacologia , Tubulina (Proteína)/metabolismo , Células A549 , Antineoplásicos/síntese química , Antineoplásicos/química , Apoptose/efeitos dos fármacos , Ciclo Celular/efeitos dos fármacos , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Células MCF-7 , Simulação de Acoplamento Molecular , Estrutura Molecular , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química , Tionas/síntese química , Tionas/química , Moduladores de Tubulina/síntese química , Moduladores de Tubulina/química
5.
Eur J Med Chem ; 185: 111830, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31718945

RESUMO

Compounds with high lipophilic properties are often associated with bad physicochemical properties, triggering many off-targets, and less likely to pass clinical trials. Two metabolically stable phenylthiazole antibiotic scaffolds having notable high lipophilic characters, one with alkoxy side chain and the other one with alkynyl moiety, were derivatized by inserting a cyclic amine at the lipophilic tail with the objective of improving physicochemical properties and the overall pharmacokinetic behavior. Only alkynyl derivatives with 4- or 5-membered rings showed remarkable antibacterial activity. The azetidine-containing compound 8 was the most effective and it revealed a potent antibacterial effect against 15 multi-drug resistant (MDR)-Gram positive pathogens including Staphylococcus aureus, Streptococcus pneumoniae, Staphylococcus epidermidis and enterococci. Compound 8 was also highly effective in clearing 99.7% of the intracellular methicillin-resistant S. aureus (MRSA) harbored inside macrophages. In addition to the remarkable enhancement in aqueous solubility, the in vivo pharmacokinetic study in rats indicated that compound 8 can penetrate gut cells and reach plasma at a therapeutic concentration within 15 min and maintain effective plasma concentration for around 12 h. Interestingly, the main potential metabolite (compound 9) was also active as an antibacterial agent with potent antibiofilm activity.


Assuntos
Antibacterianos/farmacologia , Staphylococcus/efeitos dos fármacos , Tiazóis/farmacologia , Animais , Antibacterianos/síntese química , Antibacterianos/química , Biofilmes/efeitos dos fármacos , Células CACO-2 , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Humanos , Interações Hidrofóbicas e Hidrofílicas , Cinética , Macrófagos/efeitos dos fármacos , Masculino , Camundongos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Ratos , Ratos Sprague-Dawley , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
6.
Mini Rev Med Chem ; 19(20): 1717-1725, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31880237

RESUMO

BACKGROUND & OBJECTIVE: A new series of thiazoles substituted on the chromene scaffold were prepared by facial approaches starting from (E)-1-(2,3-Dihydrochromen-4-ylidene)thiosemicarbazide derivatives (2a,b). The thiosemicarbazides (2a,b) were reacted with a series of α-halo carbonyl compounds to give the corresponding rhodanine analogues and reacted also with C-acetyl-or Cethoxy- N-hydrazonoyl chlorides to afford the corresponding tri- and tetra-substituted hybrid hydrazinyl thiazole substituted chromenes. METHODS: The newly synthesized compounds were screened for their in vitro antimicrobial and antitumor activities by agar diffusion method and MTT assay, respectively. RESULTS: The results of the antimicrobial activity revealed that some of the new compounds exhibited excellent activity against pathogenic microorganism; Candida albicans compared with Ciprofloxacin and nystatin, as the reference drugs. All of the tested compounds exhibited significant cytotoxic activities comparable to that of the reference drug; Doxorubicin® (on HCT116 (colorectal carcinoma human cell line).


Assuntos
Antibacterianos/síntese química , Antibacterianos/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/farmacologia , Benzopiranos/química , Benzopiranos/farmacologia , Tiazóis/química , Tiazóis/farmacologia , Ágar/química , Antibacterianos/química , Antineoplásicos/química , Bacillus subtilis/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Difusão , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Escherichia coli/efeitos dos fármacos , Células HCT116 , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Pseudomonas/efeitos dos fármacos , Staphylococcus aureus/efeitos dos fármacos , Relação Estrutura-Atividade , Tiazóis/síntese química
7.
Eur J Med Chem ; 184: 111747, 2019 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-31604164

RESUMO

The present study reports on evaluation of anti-HCV activity and QSAR of certain arylidenethiazolidinone derivatives as potential inhibitors of HCV-NS5B polymerase. The pursued compounds involving, 5-aryliden-3-arylacetamidothiazolidin-2,4-diones 4-6(a-f), 5-arylidine-2-(N-arylacetamido)-iminothiazolidin-4-one (10) and their rigid counterparts 5-arylidinethiazolotriazines 13-15(a-f), were synthesized and their structures confirmed by spectral and elemental analyses. The results of NS5B polymerase inhibition assay revealed compound 4e, as the most active inhibitor (IC50 = 0.035 µM), which is four folds greater than that of the reference agent, VCH-759, (IC50 = 0.14 µM). Meanwhile, compounds 4b, 4c, 5a, and 5c, and 13b, 14e and 15c displayed equipotency to 2 folds higher activity than VCH-759 (IC50 values: 0.085, 0.14, 0.14, 0.10, 0.12, 0.09 and 0.07 µM, respectively). Assessment of the anti-HCV activity (GT1a) using human hepatoma cell line (Huh-7.5) illustrates superior activity of 4e (EC50 = 3.80 µM) relative to VCH-759 (EC50 = 5.29 µM). Cytotoxicity evaluation on, Transformed normal cell lines (Human Liver Epithelial-2, THLE-2 and Proximal Tubular Epithelial, RPTEC/TERT1), demonstrate enhanced safety profile of 4e (CC50 = 102.77, 161.37 µM, respectively) compared to VCH-759 (CC50 = 61.83, 81.28 µM, respectively). Molecular docking of the synthesized derivatives to NS5B polymerase allosteric site (PDB: 2HWH) showed similar binding modes to that of the co-crystallized ligand. Moreover, QSAR models were established for the studied thiazolidinones and thiazolotriazines to investigate the molecular characteristics contributing to the observed NS5B polymerase inhibition activity. The obtained results inspire further investigations of thiazolidinones and thiazolotriazine aiming at affording more potent, safe and orally active non-nucleoside NS5B polymerase inhibitors as anti-HCV drug candidates.


Assuntos
Antivirais/farmacologia , Hepacivirus/efeitos dos fármacos , Inibidores de Proteases/farmacologia , Relação Quantitativa Estrutura-Atividade , Proteínas não Estruturais Virais/antagonistas & inibidores , Antivirais/síntese química , Antivirais/química , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Hepacivirus/metabolismo , Humanos , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteases/síntese química , Inibidores de Proteases/química , Tiazóis/síntese química , Tiazóis/química , Tiazóis/farmacologia , Tiazolidinas/síntese química , Tiazolidinas/química , Tiazolidinas/farmacologia , Triazinas/síntese química , Triazinas/química , Triazinas/farmacologia , Proteínas não Estruturais Virais/metabolismo
8.
Chemistry ; 25(69): 15759-15764, 2019 Dec 10.
Artigo em Inglês | MEDLINE | ID: mdl-31628819

RESUMO

A general and robust method for the incorporation of aspartates with a thioacid side chain into peptides has been developed. Pseudoproline tripeptides served as building blocks for the efficient fluorenylmethyloxycarbonyl (Fmoc) solid-phase synthesis of thioacid-containing peptides. These peptides were readily converted to complex N-glycopeptides by using a fast and chemoselective one-pot deprotection/ligation procedure. Furthermore, a novel side reaction that can lead to site-selective peptide cleavage using thioacids (CUT) was discovered and studied in detail.


Assuntos
Glicopeptídeos/síntese química , Oligopeptídeos/química , Prolina/análogos & derivados , Técnicas de Síntese em Fase Sólida/métodos , Tiazóis/química , Ácidos/química , Sequência de Aminoácidos , Fluorenos/síntese química , Fluorenos/química , Glicopeptídeos/química , Oligopeptídeos/síntese química , Prolina/síntese química , Prolina/química , Compostos de Sulfidrila/química , Tiazóis/síntese química
9.
Chem Biodivers ; 16(12): e1900431, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31609078

RESUMO

A series of aminothiazole derivatives bearing the benzimidazole moiety were synthesized and evaluated in Gli luciferase reporter assays. Lead optimization led to the discovery of potent hedgehog pathway antagonist 18 (2-[3-(1H-benzimidazol-2-yl)-4-chloroanilino]-N-[4-(trifluoromethyl)phenyl]-1,3-thiazole-4-carboxamide), with IC50 values in nanomolar range. The molecular basis ascribed to hindering sonic hedgehog-driven Smoothened (Smo) localization within the primary cilium (PC). Moreover, compound 18 inhibited Gli1 mRNA expression in mutant Smo cell line and displayed moderate cytotoxicity against DAOY cancer cell.


Assuntos
Proteínas Hedgehog/metabolismo , Tiazóis/química , Anilidas/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/química , Antineoplásicos/farmacologia , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Proteínas Hedgehog/química , Camundongos , Piridinas/farmacologia , Transdução de Sinais/efeitos dos fármacos , Tiazóis/síntese química , Tiazóis/farmacologia
10.
Eur J Med Chem ; 182: 111648, 2019 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-31493743

RESUMO

Epidermal growth factor receptor (EGFR, also known as HER1) and HER2, prominent members of receptor tyrosine kinase (RTK) superfamily, have been reported as diagnostic or prognostic markers in tumor progression. Based on the importance of molecular hybridization of pyrazoline and thiazole scaffolds in the discovery of potent anticancer agents, new thiazolyl-pyrazoline derivatives (3a-v) were synthesized and screened for their cytotoxic effects on A549 human lung adenocarcinoma, MCF-7 human breast adenocarcinoma and A375 human melanoma cell lines. 1-(4-(4-Fluorophenyl)thiazol-2-yl)-3-(4-morpholinophenyl)-5-(4-chlorophenyl)-2-pyrazoline (3c),1-(4-(4-cyanophenyl)thiazol-2-yl)-3-(4-morpholinophenyl)-5-(4-chlorophenyl)-2-pyrazoline (3f) and 1-(4-(4-cyanophenyl)thiazol-2-yl)-3-(4-piperidinophenyl)-5-(4-chlorophenyl)-2-pyrazoline (3q) were found as the most potent anticancer agents against A549 and MCF-7 cell lines compared to erlotinib. Compound 3q also showed moderate cytotoxic activity against A375 cell line. Moreover, these compounds exert a cancer cell-selective action against Jurkat cell line posing no toxicity on peripheral blood mononuclear cells (PBMCs). In order to enlighten the mechanism of action underlying anticancer activity, compounds 3c, 3f and 3q were investigated for their apoptotic effects on A549 and MCF-7 cell lines and inhibitory potencies against eight different RTKs including EGFR and HER2 compared to erlotinib. The results indicated that compounds 3f and 3q induced apoptosis in both cell lines and showed significant EGFR inhibitory activity with IC50 values of 4.34 ±â€¯0.66 µM and 4.71 ±â€¯0.84 µM, respectively when compared with erlotinib (IC50 = 0.05 ±â€¯0.01 µM). Besides, compound 3f also inhibited HER2 notably with an IC50 value of 2.28 ±â€¯0.53 µM making it a dual EGFR and HER2 inhibitor. Molecular docking studies, which were conducted to support the in vitro assays, pointed out that compound 3f showed high affinity into the ATP binding sites of EGFR and HER2.


Assuntos
Antineoplásicos/farmacologia , Desenho de Drogas , Inibidores de Proteínas Quinases/farmacologia , Pirazóis/farmacologia , Receptor ErbB-2/antagonistas & inibidores , Tiazóis/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/química , Morte Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Receptores ErbB/antagonistas & inibidores , Receptores ErbB/metabolismo , Humanos , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Pirazóis/síntese química , Pirazóis/química , Receptor ErbB-2/metabolismo , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química , Células Tumorais Cultivadas
11.
Eur J Med Chem ; 182: 111593, 2019 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-31446245

RESUMO

A novel series of phenylthiazoles bearing cyclic amines at the phenyl-4 position was prepared with the objective of decreasing lipophilicity and improving the overall physicochemical properties and pharmacokinetic profile of the compounds. Briefly, the piperidine ring (compounds 10 and 12) provided the best ring size in terms of antibacterial activity when tested against 16 multidrug-resistant clinical isolates. Both compounds were superior to vancomycin in the ability to eliminate methicillin-resistant Staphylococcus aureus (MRSA), residing within infected macrophages and to disrupt mature MRSA biofilm. Additionally, compounds 10 and 12 exhibited a fast-bactericidal mode of action in vitro. Furthermore, the new derivatives were 160-times more soluble in water than the previous lead compound 1b. Consequently, compound 10 was orally bioavailable with a highly-acceptable pharmacokinetic profile in vivo that exhibited a half-life of 4 h and achieved a maximum plasma concentration that exceeded the minimum inhibitory concentration (MIC) values against all tested bacterial isolates.


Assuntos
Aminas/farmacologia , Antibacterianos/farmacologia , Farmacorresistência Bacteriana Múltipla/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Obesidade/tratamento farmacológico , Tiazóis/farmacologia , Aminas/química , Animais , Antibacterianos/síntese química , Antibacterianos/química , Linhagem Celular , Relação Dose-Resposta a Droga , Humanos , Macrófagos/efeitos dos fármacos , Macrófagos/microbiologia , Masculino , Camundongos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Obesidade/microbiologia , Ratos , Ratos Sprague-Dawley , Infecções Estafilocócicas/tratamento farmacológico , Infecções Estafilocócicas/metabolismo , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
12.
Analyst ; 144(16): 4750-4756, 2019 Aug 05.
Artigo em Inglês | MEDLINE | ID: mdl-31282915

RESUMO

Cancer is a global health issue and a leading cause of death. The discrimination of cancer cells from normal cells is of significant importance for the early diagnosis of cancers. As one of the useful biomarkers for developing cancer diagnosis and chemotherapy resistance systems, biothiols not only play an essential role in physiological and pathological processes but also exhibit cytoprotective effects in the susceptibility to carcinogenesis. It would be highly desirable to explore near-infrared biothiol-specific fluorescent probes for cancer diagnosis with outstanding specificity. In this study, a novel near-infrared fluorescent probe BPO-THAZ decorated with thiazole as a recognition site was presented for sensitive and selective detection of endogenous biothiols. BPO-THAZ can be used to not only evaluate the biothiol level in living HeLa cells upon treatment with H2O2 or anti-cancer drugs but also assess endogenous biothiols in stem cells. Furthermore, BPO-THAZ was successfully utilized to discriminate cancer cells from normal cells showing great promise for cancer diagnosis.


Assuntos
Corantes Fluorescentes/química , Compostos de Sulfidrila/análise , Tiazóis/química , Animais , Biomarcadores Tumorais/análise , Linhagem Celular Tumoral , Células-Tronco Embrionárias , Fluoresceínas/síntese química , Fluoresceínas/química , Fluoresceínas/toxicidade , Corantes Fluorescentes/síntese química , Corantes Fluorescentes/toxicidade , Humanos , Limite de Detecção , Camundongos , Microscopia Confocal/métodos , Microscopia de Fluorescência/métodos , Células NIH 3T3 , Células-Tronco Pluripotentes , Tiazóis/síntese química , Tiazóis/toxicidade
13.
Molecules ; 24(14)2019 Jul 17.
Artigo em Inglês | MEDLINE | ID: mdl-31319619

RESUMO

In order to explore more efficient sulfonamides against Botrytis cinereal, 36 novel cyclohexylsulfonamides were synthesized by N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDCI) and 1-hydroxybenzotriazole (HOBt) condensation reaction using chesulfamide as a lead compound, introducing thiazole and pyrazole active groups. Their structures were characterized by 1H-NMR, 13C-NMR, mass spectrum (MS), and elemental analysis. Compound III -31 was further confirmed by X-ray single crystal diffraction. The in vitro and in vivo fungicidal activities against B. cinerea were evaluated by three bioassay methods. The results of mycelial growth demonstrated that median effective concentration (EC50) values of nine compounds were close to boscalid (EC50 = 1.72 µg/mL) and procymidone (EC50 = 1.79 µg/mL) against B. cinerea (KZ-9). In the spore germination experiment, it was found that compounds III-19 and III-31 inhibited germination 93.89 and 98.00%, respectively; at 10 µg/mL, they approached boscalid (95.97%). In the tomato pot experiment, the control effects of two compounds (III-21 and III-27) were 89.80 and 87.90%, respectively, at 200 µg/mL which were significantly higher than boscalid (81.99%). The structure-activity relationship (SAR) was also discussed, which provided a valuable idea for developing new fungicides.


Assuntos
Botrytis/efeitos dos fármacos , Fungicidas Industriais/química , Sulfonamidas/química , Botrytis/patogenicidade , Fungicidas Industriais/síntese química , Fungicidas Industriais/farmacologia , Relação Estrutura-Atividade , Sulfonamidas/síntese química , Sulfonamidas/farmacologia , Tiazóis/síntese química , Tiazóis/química
14.
Molecules ; 24(13)2019 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-31261693

RESUMO

Alzheimer's disease (AD) is the most common of the degenerative brain diseases and is described together with the impairment of cognitive function. Patients with AD lose the capability to code new memories, and life conditions are extremely difficult. The development of new drugs in this area continues at a great pace. A novel series of thiazole-piperazine hybrids, aimed against Alzheimer's disease (AD), have been synthesized. The structure identification of synthesized compounds was elucidated by 1HNMR, 13C-NMR, and LCMSMS spectroscopic methods. The inhibitory potential of the synthesized compounds on cholinesterase enzymes was investigated. The compounds 3a, 3c and 3i showed significant inhibitory activity on the acetylcholinesterase (AChE) enzyme. On the other hand, none of the compounds showed significant inhibitory activity on the butyrylcholinesterase (BChE) enzyme. In addition to enzyme inhibition studies, enzyme kinetic studies were performed to observe the effects of the most active inhibitor compounds on the substrate-enzyme relationship. In addition to in vitro tests, docking studies also indicated that compound 3c potentially acts as a dual binding site AChE inhibitor.


Assuntos
Inibidores da Colinesterase/síntese química , Hidrazonas/síntese química , Tiazóis/síntese química , Acetilcolinesterase/química , Acetilcolinesterase/metabolismo , Inibidores da Colinesterase/química , Inibidores da Colinesterase/farmacologia , Cristalografia por Raios X , Proteínas Ligadas por GPI/química , Proteínas Ligadas por GPI/metabolismo , Humanos , Hidrazonas/química , Hidrazonas/farmacologia , Simulação de Acoplamento Molecular , Estrutura Molecular , Espectroscopia de Prótons por Ressonância Magnética , Relação Estrutura-Atividade , Tiazóis/química , Tiazóis/farmacologia
15.
Eur J Med Chem ; 180: 154-170, 2019 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-31302448

RESUMO

The strong therapeutic potential of CB2 receptor agonists for use as anti-inflammatory agents that lack psychiatric side effects has attracted substantial interest. We herein describe the rational design and synthesis of novel thiazole and benzothiazole derivatives and the evaluation of their binding affinity and functional activity on CB1 and CB2 receptors. The series with the general formula N-(3-pentylbenzo [d]thiazol-2(3H)-ylidene) carboxamide (compounds 6a-6d) exhibited the highest affinity and selectivity towards CB2 receptors with Kis in the picomolar or low nanomolar range, and selectivity indices (Ki hCB1/Ki hCB2) reaching up to 429 fold. Notably, these compounds also demonstrated an agonistic functional activity in cellular assays with EC50s in the low nanomolar range. More interestingly, compound 6d, the 3-(trifluoromethyl)benzamide derivative, exhibited remarkable protection against DSS-induced acute colitis in mice model.


Assuntos
Anti-Inflamatórios não Esteroides/farmacologia , Benzotiazóis/farmacologia , Agonistas de Receptores de Canabinoides/farmacologia , Colite/tratamento farmacológico , Receptor CB2 de Canabinoide/agonistas , Tiazóis/farmacologia , Animais , Anti-Inflamatórios não Esteroides/síntese química , Anti-Inflamatórios não Esteroides/química , Benzotiazóis/síntese química , Benzotiazóis/química , Agonistas de Receptores de Canabinoides/síntese química , Agonistas de Receptores de Canabinoides/química , Colite/induzido quimicamente , Sulfato de Dextrana , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Humanos , Masculino , Camundongos , Estrutura Molecular , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
16.
Eur J Med Chem ; 180: 191-203, 2019 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-31306906

RESUMO

Chagas disease is an illness caused by the protozoan parasite Trypanosoma cruzi. The current chemotherapy is based on benznidazole, and, in some countries, Nifurtimox, which is effective in the acute phase of the disease, but its efficacy in the chronic phase remains controversial. It can also cause serious side effects that lead sufferers to abandon treatment. In the present work, is reported the synthesis and trypanocidal activity of new 2-(phenylthio)ethylidene thiosemicarbazones (4-15) and 1,3-thiazoles (16-26). The cyclization of thiosemicarbazones into 1,3-thiazoles presents an improvement in the cytotoxic profile for T. cruzi parasite, denoting selective compounds. Compound 18 was identified as the most promising of all compounds tested, showing an IC50 of 2.6 µM for the trypomastigote form and a non-cytotoxic effect on mouse spleen cells, reaching a selective index of 95.1. Among the 22 compounds tested, six compounds present a better trypanocidal activity, and five compounds have an equipotent activity compared to benznidazole. Flow cytometry and ultrastructural analysis were performed and indicate that compound 18 causes parasite cell death through apoptosis and acts via an autophagic pathway.


Assuntos
Desenho de Drogas , Tiazóis/farmacologia , Tiossemicarbazonas/farmacologia , Tripanossomicidas/farmacologia , Trypanosoma cruzi/efeitos dos fármacos , Relação Dose-Resposta a Droga , Estrutura Molecular , Testes de Sensibilidade Parasitária , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química , Tiossemicarbazonas/síntese química , Tiossemicarbazonas/química , Tripanossomicidas/síntese química , Tripanossomicidas/química
17.
Eur J Med Chem ; 178: 767-781, 2019 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-31234030

RESUMO

By the analysis of different binding modes with Bruton's tyrosine kinase (BTK), series of novel diphenylthiazole derivatives were rationally designed, synthesized and characterized. Biologically evaluation in biochemistry and cellular assay indicated that, compounds 5m, 5o, 6b, 6c, 6g, 6i, 7h, 7i, 7k, 7m, 7n, 7o and 7s exhibited improved potency against Ramos cell (IC50 = 1.36-8.60 µM) and Raji cell (IC50 = 1.20-14.04 µM) as compared with ibrutinib (IC50 = 14.69 and 15.99 µM, respectively). Especially, compounds 7m and 7n showed 10-time improved potency against Ramos cell viability over ibrutinib. Compound 6b improved 13-fold activity against Raji cell viability than ibrutinib. In addition, active compound 7o potently inhibited C481S mutant BTK with IC50 value of 0.061 µM. Apoptosis analysis of both Ramos and Raji cells indicated that 7o was remarkably more potent than CGI-1746 and ibrutinib. Compound 7o potently inhibited BTK Y223 phosphorylation in Raji cells, and arrested cell cycle progression in the G0/G1 phase in Raji and Ramos cells. This study expanded the structural diversity of BTK inhibitors and compound 7o was discovered as an active lead inhibitor with great potential for further studies.


Assuntos
Tirosina Quinase da Agamaglobulinemia/antagonistas & inibidores , Antineoplásicos/farmacologia , Descoberta de Drogas , Linfoma Difuso de Grandes Células B/tratamento farmacológico , Inibidores de Proteínas Quinases/farmacologia , Tiazóis/farmacologia , Tirosina Quinase da Agamaglobulinemia/metabolismo , Antineoplásicos/síntese química , Antineoplásicos/química , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Cristalografia por Raios X , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Linfoma Difuso de Grandes Células B/metabolismo , Linfoma Difuso de Grandes Células B/patologia , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química , Células Tumorais Cultivadas
18.
Eur J Med Chem ; 178: 315-328, 2019 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-31195172

RESUMO

The dormant and resistant form of Mycobacterium tuberculosis presents a challenge in developing new anti-tubercular drugs. Herein, we report the synthesis and evaluation of trisubstituted thiazoles as antituberculosis agents. The SAR study has identified a requirement of hydrophobic substituent at C2, ester functionality at C4, and various groups with hydrogen bond acceptor character at C5 of thiazole scaffold. This has led to the identification of 13h and 13p as lead compounds. These compounds inhibited the dormant Mycobacterium tuberculosis H37Ra strain and M. tuberculosis H37Rv selectively. Importantly, 13h and 13p were non-toxic to CHO cells. The 13p showed activity against multidrug-resistant tuberculosis isolates.


Assuntos
Antituberculosos/farmacologia , Mycobacterium tuberculosis/efeitos dos fármacos , Tiazóis/farmacologia , Tuberculose Resistente a Múltiplos Medicamentos/tratamento farmacológico , Antituberculosos/síntese química , Antituberculosos/química , Relação Dose-Resposta a Droga , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Relação Estrutura-Atividade , Tiazóis/síntese química , Tiazóis/química
19.
Mar Drugs ; 17(6)2019 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-31163697

RESUMO

Largazole, isolated from a marine Cyanobacterium of the genus Symploca, is a potent and selective Class I HDAC (histone deacetylation enzymes) inhibitor. This natural 16-membered macrocyclic depsipeptide features an interesting side chain unit, namely 3-hydroxy-7-mercaptohept-4-enoic acid, which occurs in many other natural sulfur-containing HDAC inhibitors. Notably, one similar fragment, where the amide moiety replaces the trans alkene moiety, appears in Psammaplin A, another marine natural product with potent HDAC inhibitory activities. Inspired by such a structural similarity, we hypothesized the fluoroolefin moiety would mimic both the alkene moiety in Largazole and the amide moiety in Psammaplin A, and thus designed and synthesized two novel fluoro olefin analogs of Largazole. The preliminary biological assays showed that the fluoro analogs possessed comparable Class I HDAC inhibitory effects, indicating that this kind of modification on the side chain of Largazole was tolerable.


Assuntos
Organismos Aquáticos/química , Cianobactérias/química , Depsipeptídeos/síntese química , Depsipeptídeos/farmacologia , Dissulfetos/química , Inibidores de Histona Desacetilases/farmacologia , Tiazóis/síntese química , Tiazóis/farmacologia , Tirosina/análogos & derivados , Alcenos/química , Depsipeptídeos/química , Ativação Enzimática/efeitos dos fármacos , Inibidores de Histona Desacetilases/síntese química , Inibidores de Histona Desacetilases/química , Histona Desacetilases/metabolismo , Tiazóis/química , Tirosina/química
20.
Eur J Med Chem ; 177: 153-170, 2019 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-31132531

RESUMO

The eukaryotic initiation factor 4E (eIF4E) is an emerging anticancer drug target for specific anticancer therapy as a promising approach to overcome drug resistance and promote chemotherapy antitumor efficacy. A series of bromophenol-thiazolylhydrazone hybrids were designed, synthesized and evaluated for their antitumor activities. Among of them, the most potent compound 3e (EGPI-1) could inhibit the eIF4E/eIF4G interaction. Further mechanism study demonstrated EGPI-1 played an antitumor role in multiple modes of action including regulating the activity of eIF4E by inhibiting the phosphorylation of eIF4E and 4EBP1, disrupting mitochondrial function through the mTOR/4EBP1 signaling pathway, and inducing autophagy, apoptosis and ROS generation. Moreover, EGPI-1 showed good safety and favorable pharmacokinetic properties in vivo. These observations demonstrate that EGPI-1 may serve as an excellent lead compound for the development of new anticancer drugs that target the eIF4E/eIF4G interface and as a chemical genetic probe to investigate the role of the eIF4E in biological processes and human diseases.


Assuntos
Antineoplásicos/farmacologia , Fator de Iniciação 4E em Eucariotos/antagonistas & inibidores , Fator de Iniciação 4G em Eucariotos/antagonistas & inibidores , Hidrazonas/farmacologia , Tiazóis/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/farmacocinética , Antineoplásicos/toxicidade , Apoptose/efeitos dos fármacos , Autofagia/efeitos dos fármacos , Sítios de Ligação , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Desenho de Drogas , Fator de Iniciação 4E em Eucariotos/química , Fator de Iniciação 4E em Eucariotos/metabolismo , Fator de Iniciação 4G em Eucariotos/metabolismo , Feminino , Células Endoteliais da Veia Umbilical Humana , Humanos , Hidrazonas/síntese química , Hidrazonas/farmacocinética , Hidrazonas/toxicidade , Masculino , Camundongos , Simulação de Acoplamento Molecular , Fosforilação , Ligação Proteica , Ratos Sprague-Dawley , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais/efeitos dos fármacos , Tiazóis/síntese química , Tiazóis/farmacocinética , Tiazóis/toxicidade , Ensaios Antitumorais Modelo de Xenoenxerto
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA