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Pessôa MTC, Valadares JMM, Rocha SC, Silva SC, McDermott JP, Sánchez G, Varotti FP, Scavone C, Ribeiro RIMA, Villar JAFP, Blanco G, Barbosa LA. 21-Benzylidene digoxin decreases proliferation by inhibiting the EGFR/ERK signaling pathway and induces apoptosis in HeLa cells. Steroids 2020; 155:108551. [PMID: 31812624 PMCID: PMC7028499 DOI: 10.1016/j.steroids.2019.108551] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 10/30/2019] [Accepted: 12/02/2019] [Indexed: 12/12/2022]
Abstract
Cardiotonic steroids (CTS) are agents traditionally known for their capacity to bind to the Na,K-ATPase (NKA), affecting the ion transport and the contraction of the heart. Natural CTS have been shown to also have effects on cell signaling pathways. With the goal of developing a new CTS derivative, we synthesized a new digoxin derivative, 21-benzylidene digoxin (21-BD). Previously, we have shown that this compound binds to NKA and has cytotoxic actions on cancer, but not on normal cells. Here, we further studied the mechanisms of actions of 21-BD. Working with HeLa cells, we found that 21-BD decreases the basal, as well as the insulin stimulated proliferation. 21-BD reduces phosphorylation of the epidermal growth factor receptor (EGFR) and extracellular-regulated kinase (ERK), which are involved in pathways that stimulate cell proliferation. In addition, 21-BD promotes apoptosis, which is mediated by the translocation of Bax from the cytosol to mitochondria and the release of mitochondrial cytochrome c to the cytosol. 21-BD also activated caspases-8, -9 and -3, and induced the cleavage of poly (ADP-ribose) polymerase-1 (PARP-1). Altogether, these results show that the new compound that we have synthesized exerts cytotoxic actions on HeLa cells by inhibition of cell proliferation and the activation of both the extrinsic and intrinsic apoptotic pathways. These results support the relevance of the cardiotonic steroid scaffold as modulators of cell signaling pathways and potential agents for their use in cancer.
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Affiliation(s)
- Marco Túlio C Pessôa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Jéssica M M Valadares
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Sayonarah C Rocha
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Simone C Silva
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Jeff P McDermott
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center (KUMC), Kansas City, KS, USA
| | - Gladis Sánchez
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center (KUMC), Kansas City, KS, USA
| | - Fernando P Varotti
- Núcleo de Pesquisa em Química Biológica (NQBio), Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Cristóforo Scavone
- Laboratório de Neurofarmacologia Molecular, Departamento de Farmacologia, Instituto de Ciências Biomédicas, Universidade de São Paulo (USP), São Paulo, SP, Brazil
| | - Rosy I M A Ribeiro
- Laboratório de Patologia Experimental, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - José A F P Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Gustavo Blanco
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center (KUMC), Kansas City, KS, USA
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei (UFSJ) Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil.
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de Souza Gonçalves B, de Moura Valadares JM, Alves SLG, Silva SC, Rangel LP, Cortes VF, Villar JAFP, Barbosa LA, de Lima Santos H. Evaluation of neuroprotective activity of digoxin and semisynthetic derivatives against partial chemical ischemia. J Cell Biochem 2019; 120:17108-17122. [PMID: 31310381 DOI: 10.1002/jcb.28971] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 03/29/2019] [Accepted: 04/08/2019] [Indexed: 02/06/2023]
Abstract
Recently, cardiotonic steroids (CTS) have been shown to lead to the activation of Na,K-ATPase at low concentrations in brain, promoting neuroprotection against ischemia. We report here the results of the use of digoxin and its semisynthetic derivatives BD-14, BD-15, and BD-16 against partial chemical ischemic induction followed by reperfusion in murine neuroblastoma cells neuro-2a (N2a). For chemical ischemic induction, sodium azide (5 mM) was used for 5 hours, and then reperfusion was induced for 24 hours. Na,K-ATPase activity and protein levels were analyzed in membrane preparation of N2a cells pretreated with the compounds (150 nM), in the controls and in induced chemical ischemia. In the Na,K-ATPase activity and protein levels assays, the steroids digoxin and BD-15 demonstrated a capacity to modulate the activity of the enzyme directly, increasing its levels of expression and activity. Oxidative parameters, such as superoxide dismutase (SOD) activity, lipid peroxidation (thiobarbituric acid reactive substance), glutathione peroxidase (GPx), glutathione (GSH) levels, hydrogen peroxide content, and the amount of free radicals (reactive oxygen species) during induced chemical ischemia were also evaluated. Regarding the redox state, lipid peroxidation, hydrogen peroxide content, and GPx activity, we have observed an increase in the chemical ischemic group, and a reduction in the groups treated with CTS. SOD activity increased in all treated groups when compared to control and GSH levels decreased when treated with sodium azide and did not change with CTS treatments. Regarding the lipid profile, we saw a decrease in the content of phospholipids and cholesterol in the chemical ischemic group, and an increase in the groups treated with CTS. In conclusion, the compounds used in this study demonstrate promising results, since they appear to promote neuroprotection in cells exposed to chemical ischemia.
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Affiliation(s)
- Bruno de Souza Gonçalves
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | | | - Silmara L G Alves
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Simone C Silva
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Luciana P Rangel
- Laboratório de Bioquímica Tumoral, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - José A F P Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Hérica de Lima Santos
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
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Santos FRS, Andrade JT, Sousa CDF, Fernandes JS, Carmo LF, Araújo MGF, Ferreira JMS, Villar JAFP. Synthesis and Evaluation of the in vitro Antimicrobial Activity of Triazoles, Morpholines and Thiosemicarbazones. Med Chem 2019; 15:38-50. [PMID: 30058497 DOI: 10.2174/1573406414666180730111954] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 07/11/2018] [Accepted: 07/24/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Microbial infections is a global public health problem. The aim of this work was to synthesize and evaluate the antimicrobial activity of novel triazoles, morpholines and thiosemicarbazones. METHODS Compounds were synthesized using 2,4-Dihydroxyacetophenone and 4-hydroxybenzaldehyde as starting materials. The antimicrobial activity of these compounds against bacteria and yeast was evaluated by the broth microdilution method. RESULTS The proposed route for synthesis gave high to moderate yields, moreover these compounds were successfully characterized by 1H NMR, 13C NMR and LC-MS. Antimicrobial testing indicated that the thiosemicarbazone and morphine derivatives had the best antimicrobial activity against the microorganisms tested with minimum inhibitory concentrations (MIC) between 0.29 and 5.30 µM. Thiosemicarbazone derivative (12) was able to inhibit the growth of C. tropicalis, with minimum fungicidal concentration (MFC) of 0.55 µM. In addition, this compound was active against E. coli, S. aureus and S. epidermidis, with MIC values ranging from 0.29 to 1.11 µM. Moreover, the morpholine derivative (15) had an MIC value of 0.83 µM against C. albicans and E. coli. CONCLUSION We have efficiently synthesized a series of eleven novel triazoles, thiosemicarbazones and morpholine derivatives using 2,4-Dihydroxyacetophenone and 4-hydroxybenzaldehyde as starting materials. Thiosemicarbazone derivative (12) showed promising antifungal and antibacterial activity and these findings suggest that this compound can be used as scaffolds to design new antimicrobial drugs.
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Affiliation(s)
- Felipe R S Santos
- Laboratorio de Sintese Organica e Nanoestruturas, Universidade Federal de Sao Joao del-Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Jéssica T Andrade
- Laboratorio de Microbiologia, Universidade Federal de Sao Joao del- Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Carla D F Sousa
- Laboratorio de Microbiologia, Universidade Federal de Sao Joao del- Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Joice S Fernandes
- Laboratorio de Sintese Organica e Nanoestruturas, Universidade Federal de Sao Joao del-Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Lucas F Carmo
- Laboratorio de Sintese Organica e Nanoestruturas, Universidade Federal de Sao Joao del-Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Marcelo G F Araújo
- Laboratorio de Farmacologia, Universidade Federal de Sao Joao del-Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - Jaqueline M S Ferreira
- Laboratorio de Microbiologia, Universidade Federal de Sao Joao del- Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
| | - José A F P Villar
- Laboratorio de Sintese Organica e Nanoestruturas, Universidade Federal de Sao Joao del-Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, 35501-296, Brazil
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Andrade JT, Santos FRS, Lima WG, Sousa CDF, Oliveira LSFM, Ribeiro RIMA, Gomes AJPS, Araújo MGF, Villar JAFP, Ferreira JMS. Design, synthesis, biological activity and structure-activity relationship studies of chalcone derivatives as potential anti-Candida agents. J Antibiot (Tokyo) 2018; 71:702-712. [DOI: 10.1038/s41429-018-0048-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 02/22/2018] [Accepted: 03/13/2018] [Indexed: 01/05/2023]
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Pessôa MTC, Alves SLG, Taranto AG, Villar JAFP, Blanco G, Barbosa LA. Selectivity analyses of γ-benzylidene digoxin derivatives to different Na,K-ATPase α isoforms: a molecular docking approach. J Enzyme Inhib Med Chem 2017; 33:85-97. [PMID: 29115894 PMCID: PMC6009882 DOI: 10.1080/14756366.2017.1380637] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Digoxin and other cardiotonic steroids (CTS) exert their effect by inhibiting Na,K-ATPase (NKA) activity. CTS bind to the various NKA isoforms that are expressed in different cell types, which gives CTS their narrow therapeutic index. We have synthesised a series of digoxin derivatives (γ-Benzylidene digoxin derivatives) with substitutions in the lactone ring (including non-oxygen and ether groups), to obtain CTS with better NKA isoform specificity. Some of these derivatives show some NKA isoform selective effects, with BD-3, BD-8, and BD-13 increasing NKA α2 activity, BD-5 inhibiting NKA α1 and NKA α3, BD-10 reducing NKA α1, but stimulating NKA α2 and α3; and BD-14, BD-15, and BD-16 enhancing NKA α3 activity. A molecular-docking approach favoured NKA isoform specific interactions for the compounds that supported their observed activity. These results show that BD compounds are a new type of CTS with the capacity to target NKA activity in an isoform-specific manner.
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Affiliation(s)
- Marco T C Pessôa
- a Laboratório de Bioquímica Celular , Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindú , Divinópolis , Brazil
| | - Silmara L G Alves
- b Laboratório de Síntese Orgânica e Nanoestruturas , Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindú , Divinópolis , Brazil
| | - Alex G Taranto
- c Laboratório de Modelagem Molecular , Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindú , Divinópolis , Brazil
| | - José A F P Villar
- b Laboratório de Síntese Orgânica e Nanoestruturas , Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindú , Divinópolis , Brazil
| | - Gustavo Blanco
- d Department of Molecular and Integrative Physiology , Kansas University Medical Center , Kansas City , KS , USA
| | - Leandro A Barbosa
- a Laboratório de Bioquímica Celular , Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindú , Divinópolis , Brazil
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Lopes MD, Oliveira FM, Coelho IEV, Passos MJF, Alves CC, Taranto AG, Júnior MC, Santos LL, Fonseca CT, Villar JAFP, Lopes DO. Epitopes rationally selected through computational analyses induce T‐cell proliferation in mice and are recognized by serum from individuals infected with
Schistosoma mansoni. Biotechnol Prog 2017; 33:804-814. [DOI: 10.1002/btpr.2463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 03/03/2017] [Indexed: 01/04/2023]
Affiliation(s)
- Marcelo D. Lopes
- Laboratório de Biologia Molecular, Universidade Federal de São João del‐Rei, Rua Sebastião Gonçalves CoelhoDivinópolis MG Brasil
| | - Flávio M. Oliveira
- Laboratório de Biologia Molecular, Universidade Federal de São João del‐Rei, Rua Sebastião Gonçalves CoelhoDivinópolis MG Brasil
| | - Ivan E. V. Coelho
- Laboratório de Química Farmacêutica, Universidade Federal de São João del‐ReiDivinópolis MGBrasil
| | - Maria J. F. Passos
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del‐ReiDivinópolis MG Brasil
| | - Clarice C. Alves
- Grupo de Pesquisa em Biologia Parasitária e Imunologia, Centro de Pesquisas René Rachou, Fundação Oswaldo CruzBelo Horizonte MG30190‐002 Brasil
| | - Alex G. Taranto
- Laboratório de Química Farmacêutica, Universidade Federal de São João del‐ReiDivinópolis MGBrasil
| | - Moacyr C. Júnior
- Laboratório de Química Farmacêutica, Universidade Federal de São João del‐ReiDivinópolis MGBrasil
| | - Luciana L. Santos
- Laboratório de Biologia Molecular, Universidade Federal de São João del‐Rei, Rua Sebastião Gonçalves CoelhoDivinópolis MG Brasil
| | - Cristina T. Fonseca
- Grupo de Pesquisa em Biologia Parasitária e Imunologia, Centro de Pesquisas René Rachou, Fundação Oswaldo CruzBelo Horizonte MG30190‐002 Brasil
| | - José A. F. P. Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del‐ReiDivinópolis MG Brasil
| | - Débora O. Lopes
- Laboratório de Biologia Molecular, Universidade Federal de São João del‐Rei, Rua Sebastião Gonçalves CoelhoDivinópolis MG Brasil
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Evangelista FCG, Bandeira MO, Silva GD, Silva MG, Andrade SN, Marques DR, Silva LM, Castro WV, Santos FV, Viana GHR, Villar JAFP, Sabino AP, Varotti FP. Synthesis and in vitro evaluation of novel triazole/azide chalcones. Med Chem Res 2016. [DOI: 10.1007/s00044-016-1705-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Alves SLG, Paixão N, Ferreira LGR, Santos FRS, Neves LDR, Oliveira GC, Cortes VF, Salomé KS, Barison A, Santos FV, Cenzi G, Varotti FP, Oliveira SMF, Taranto AG, Comar M, Silva LM, Noël F, Quintas LEM, Barbosa LA, Villar JAFP. γ-Benzylidene digoxin derivatives synthesis and molecular modeling: Evaluation of anticancer and the Na,K-ATPase activity effect. Bioorg Med Chem 2015; 23:4397-4404. [PMID: 26122772 DOI: 10.1016/j.bmc.2015.06.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 05/30/2015] [Accepted: 06/10/2015] [Indexed: 02/06/2023]
Abstract
Cardiotonic steroids (CS), natural compounds with traditional use in cardiology, have been recently suggested to exert potent anticancer effects. However, the repertoire of molecules with Na,K-ATPase activity and anticancer properties is limited. This paper describes the synthesis of 6 new digoxin derivatives substituted (on the C17-butenolide) with γ-benzylidene group and their cytotoxic effect on human fibroblast (WI-26 VA4) and cancer (HeLa and RKO) cell lines as well as their effect on Na,K-ATPase activity and expression. As digoxin, compound BD-4 was almost 100-fold more potent than the other derivatives for cytotoxicity with the three types of cells used and was also the only one able to fully inhibit the Na,K-ATPase of HeLa cells after 24h treatment. No change in the Na,K-ATPase α1 isoform protein expression was detected. On the other hand it was 30-40 fold less potent for direct Na,K-ATPase inhibition, when compared to the most potent derivatives, BD-1 and BD-3, and digoxin. The data presented here demonstrated that the anticancer effect of digoxin derivatives substituted with γ-benzylidene were not related with their inhibition of Na,K-ATPase activity or alteration of its expression, suggesting that this classical molecular mechanism of CS is not involved in the cytotoxic effect of our derivatives.
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Affiliation(s)
- Silmara L G Alves
- Laboratório de Síntese Orgânica e NanoEstruturas, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Bairro Chanadour, Divinópolis, MG CEP 35501-296, Brazil
| | - Natasha Paixão
- Laboratório de Farmacologia Bioquímica e Molecular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Av Carlos Chagas, 373, 21941-902 Rio de Janeiro, Brazil
| | - Letícia G R Ferreira
- Laboratório de Bioquímica Celular, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Felipe R S Santos
- Laboratório de Síntese Orgânica e NanoEstruturas, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Bairro Chanadour, Divinópolis, MG CEP 35501-296, Brazil
| | - Luiza D R Neves
- Laboratório de Bioquímica Celular, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Gisele C Oliveira
- Laboratório de Bioquímica Celular, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Kahlil S Salomé
- Laboratório de RMN, Universidade Federal do Paraná, 81.531-990 Curitiba, PR, Brazil
| | - Andersson Barison
- Laboratório de RMN, Universidade Federal do Paraná, 81.531-990 Curitiba, PR, Brazil
| | - Fabio V Santos
- Laboratório de Biologia Celular e Mutagenicidade, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Gisele Cenzi
- Laboratório de Bioquímica de Parasitos, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Fernando P Varotti
- Laboratório de Bioquímica de Parasitos, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Soraya M F Oliveira
- Laboratório de Bioinformática, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Alex G Taranto
- Laboratório de Bioinformática, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Moacyr Comar
- Laboratório de Bioinformática, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - Luciana M Silva
- Laboratório de Biologia Celular e Inovação Biotecnológica, Fundação Ezequiel Dias, Rua Conde Pereira Carneiro 80, 305010-010 Belo Horizonte, Brazil
| | - François Noël
- Laboratório de Farmacologia Bioquímica e Molecular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Av Carlos Chagas, 373, 21941-902 Rio de Janeiro, Brazil
| | - Luis Eduardo M Quintas
- Laboratório de Farmacologia Bioquímica e Molecular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Av Carlos Chagas, 373, 21941-902 Rio de Janeiro, Brazil
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Divinópolis, MG 35501-296, Brazil
| | - José A F P Villar
- Laboratório de Síntese Orgânica e NanoEstruturas, Universidade Federal de São João Del Rei, Campus Centro Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Bairro Chanadour, Divinópolis, MG CEP 35501-296, Brazil.
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Caracelli I, Zukerman-Schpector J, Villar JAFP, Oliveira ARM, Tiekink ERT. 4,4-Dimethyl-2-[3-nitro-2-phenyl-1-(phenyl-sulfan-yl)prop-yl]-4,5-dihydro-1,3-oxazole. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o1225-6. [PMID: 22606161 PMCID: PMC3344158 DOI: 10.1107/s1600536812012512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 03/22/2012] [Indexed: 11/10/2022]
Abstract
In the title compound, C(20)H(22)N(2)O(3)S, the oxazoline ring is planar (r.m.s. deviation = 0.045 Å) and forms dihedral angles of 47.24 (8) and 10.11 (8)° with the S- and C-bound phenyl rings, respectively. The nitro group lies to the same side of the mol-ecule as the oxazoline ring but is orientated so as not to inter-act with the ring. Linear supra-molecular chains along [010] are formed via C-H⋯O and C-H⋯S contacts. Chains are consolidated into a three-dimensional architecture by C-H⋯π and van der Waals inter-actions.
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Affiliation(s)
- Ignez Caracelli
- BioMat-Departamento de Física, Universidade Federal de São Carlos, C.P. 676, 13565-905, São Carlos, SP, Brazil,Correspondence e-mail:
| | - Julio Zukerman-Schpector
- Laboratório de Cristalografia, Estereodinâmica e, Modelagem Molecular, Universidade Federal de São Carlos, Departamento de Química, C.P. 676, 13565-905, São Carlos, SP, Brazil
| | - José A. F. P. Villar
- Universidade Federal de São João del Rei, Av. Sebastião Goncalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Alfredo R. M. Oliveira
- Universidade Federal do Paraná, Departamento de Química, C.P. 19081, 81531-990, Curitiba, PR, Brazil
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da Silva SL, Calgarotto AK, Maso V, Damico DCS, Baldasso P, Veber CL, Villar JAFP, Oliveira ARM, Comar M, Oliveira KMT, Marangoni S. Molecular modeling and inhibition of phospholipase A2 by polyhydroxy phenolic compounds. Eur J Med Chem 2008; 44:312-21. [PMID: 18423943 DOI: 10.1016/j.ejmech.2008.02.043] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2007] [Revised: 11/08/2007] [Accepted: 02/20/2008] [Indexed: 11/24/2022]
Abstract
Phospholipases A(2) are enzymes responsible for the hydrolysis of membrane phospholipids that release arachidonic acid, which serves as substrate for pro-inflammatory mediators, such as prostaglandins and leucotriens. The design of specific inhibitors for PLA(2) might help in the development of new anti-inflammatory drugs. Polyhydroxy phenolic compounds, such as flavonoids, vitamin E, rosmarinic acid and aristolochic acid, are able to inhibit PLA(2) from different sources. Herein, we have studied the kinetic behavior and the capacity of inhibiting edema formation induced by PLA(2) of five different polyhydroxy phenolic compounds (two phenolic derivatives and three acetophenone hydroxylated derivatives) extracted from the venom of Crotalus adamanteus. The results showed that compounds 1,3-dihydroxy benzene, 1,3,5-trihydroxy benzene and 2,4,6-trihydroxy acetophenone were the most efficient in the inhibition of the enzymatic activity and edema induction by PLA(2). It was also verified that the number of hydroxyls in each molecule is not a limiting factor for the inhibition capacity of these compounds. Molecular modeling studies indicated that the most active compounds are linked to the amino acid Asp 49 and that they destabilize the coordination of the calcium atom, which is essential to the catalytic activity. The study of potential surfaces showed that there are conditions in which the potential values must be adequate for enzyme complex formation with polyhydroxy phenolic compounds. When the potential over the hydroxyl surfaces is very high, formation of stable complexes does not occur and the enzyme does not act intensely. These results might be helpful in the design of a drug that specifically inhibits PLA(2).
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Affiliation(s)
- S L da Silva
- Depto de Química, ICE, Universidade Federal do Amazonas - UFAM, 69077-000 Manaus, AM, Brazil.
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