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Araujo-Lima CF, de Cassia Castro Carvalho R, Rosario SL, Leite DI, Aguiar ACC, de Souza Santos LV, de Araujo JS, Salomão K, Kaiser CR, Krettli AU, Bastos MM, Aiub CAF, de Nazaré Correia Soeiro M, Boechat N, Felzenszwalb I. Antiplasmodial, Trypanocidal, and Genotoxicity In Vitro Assessment of New Hybrid α,α-Difluorophenylacetamide-statin Derivatives. Pharmaceuticals (Basel) 2023; 16:782. [PMID: 37375730 DOI: 10.3390/ph16060782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 05/13/2023] [Accepted: 05/19/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND Statins present a plethora of pleiotropic effects including anti-inflammatory and antimicrobial responses. A,α-difluorophenylacetamides, analogs of diclofenac, are potent pre-clinical anti-inflammatory non-steroidal drugs. Molecular hybridization based on the combination of pharmacophoric moieties has emerged as a strategy for the development of new candidates aiming to obtain multitarget ligands. METHODS Considering the anti-inflammatory activity of phenylacetamides and the potential microbicidal action of statins against obligate intracellular parasites, the objective of this work was to synthesize eight new hybrid compounds of α,α-difluorophenylacetamides with the moiety of statins and assess their phenotypic activity against in vitro models of Plasmodium falciparum and Trypanosoma cruzi infection besides exploring their genotoxicity safety profile. RESULTS None of the sodium salt compounds presented antiparasitic activity and two acetated compounds displayed mild anti-P. falciparum effect. Against T. cruzi, the acetate halogenated hybrids showed moderate effect against both parasite forms relevant for human infection. Despite the considerable trypanosomicidal activity, the brominated compound revealed a genotoxic profile impairing future in vivo testing. CONCLUSIONS However, the chlorinated derivative was the most promising compound with chemical and biological profitable characteristics, without presenting genotoxicity in vitro, being eligible for further in vivo experiments.
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Affiliation(s)
- Carlos Fernando Araujo-Lima
- Laboratório de Biologia Celular, LBC Instituto Oswaldo Cruz-FIOCRUZ, Rio de Janeiro 21041-250, RJ, Brazil
- Laboratório de Mutagênese Ambiental, LabMut Instituto de Biologia Roberto Alcantara Gomes, IBRAG-UERJ, Rio de Janeiro 22050-020, RJ, Brazil
- Programa de Pós-Graduação em Biologia Molecular e Celular, Instituto Biomédico-UNIRIO, Rio de Janeiro 20211-030, RJ, Brazil
| | - Rita de Cassia Castro Carvalho
- Departamento de Síntese de Fármacos, Instituto de Tecnologia em Fármacos, Farmanguinhos-FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil
- Programa de Pós-Graduação em Química, PGQu, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-853, RJ, Brazil
| | - Sandra Loureiro Rosario
- Departamento de Síntese de Fármacos, Instituto de Tecnologia em Fármacos, Farmanguinhos-FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil
| | - Debora Inacio Leite
- Departamento de Síntese de Fármacos, Instituto de Tecnologia em Fármacos, Farmanguinhos-FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil
- Programa de Pós-Graduação em Farmacologia e Química Medicinal, ICB-UFRJ, Rio de Janeiro 21941-902, RJ, Brazil
| | - Anna Caroline Campos Aguiar
- Laboratório de Malária, Centro de Pesquisas René Rachou, CPqRR-FIOCRUZ, Belo Horizonte 30190-002, MG, Brazil
| | - Lizandra Vitoria de Souza Santos
- Laboratório de Mutagênese Ambiental, LabMut Instituto de Biologia Roberto Alcantara Gomes, IBRAG-UERJ, Rio de Janeiro 22050-020, RJ, Brazil
| | | | - Kelly Salomão
- Laboratório de Biologia Celular, LBC Instituto Oswaldo Cruz-FIOCRUZ, Rio de Janeiro 21041-250, RJ, Brazil
| | - Carlos Roland Kaiser
- Programa de Pós-Graduação em Química, PGQu, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-853, RJ, Brazil
| | - Antoniana Ursine Krettli
- Laboratório de Malária, Centro de Pesquisas René Rachou, CPqRR-FIOCRUZ, Belo Horizonte 30190-002, MG, Brazil
| | - Monica Macedo Bastos
- Departamento de Síntese de Fármacos, Instituto de Tecnologia em Fármacos, Farmanguinhos-FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil
| | - Claudia Alessandra Fortes Aiub
- Programa de Pós-Graduação em Biologia Molecular e Celular, Instituto Biomédico-UNIRIO, Rio de Janeiro 20211-030, RJ, Brazil
| | | | - Nubia Boechat
- Departamento de Síntese de Fármacos, Instituto de Tecnologia em Fármacos, Farmanguinhos-FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil
| | - Israel Felzenszwalb
- Laboratório de Mutagênese Ambiental, LabMut Instituto de Biologia Roberto Alcantara Gomes, IBRAG-UERJ, Rio de Janeiro 22050-020, RJ, Brazil
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Milhm ACP, Bonet LFS, Aiub CAF, Siqueira Junior CL. Biochemical characterization and phytotoxic activity of protein extract from Euphorbia tirucalli L. J Ethnopharmacol 2022; 285:114903. [PMID: 34890731 DOI: 10.1016/j.jep.2021.114903] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/30/2021] [Accepted: 12/06/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Euphorbia tirucalli L., a tropical and subtropical plant, also known by the popular name avelós, has been used in folk medicine against many diseases as rheumatism, asthma, toothache, and cancer. Studies have shown that natural compounds contained in this plant species may be associated with these functions. However, little is known about its potential toxicity. AIM OF THE STUDY Several proteins conduct biological functions, in particular, proteinases, play a crucial role in many mechanisms of living beings, including plants, animals and microorganisms. However, when poorly regulated, they can generate consequences, such as the non-production of certain substances, or even the abnormal multiplication of cells, which leads to tumors. On the other hand, by regulating these enzymes, proteinase inhibitors act by reducing the activity of proteinases, thus preventing their malfunction. The objective of this work was to evaluate the toxicity of the protein extract of E. tirucalli and to purify a protease inhibitor that may be associated with the biological medicinal functions of the plant. MATERIALS AND METHODS The cytotoxic and mutagenic properties of the protein extract produced from the stem of avelós was investigated using the Ames test. The protein extract was also submitted to a protease inhibitor purification process using the gel filtration chromatography technique and the purified protein was biochemically characterized. RESULTS A protease inhibitor, called tirustatin, was isolated 1.84-fold by Biogel P100. The calculated molecular mass of the isolated protein is 25.97 kDa. The inhibitor was stable at pH 3-10, with pronounced activity at pH 6. Thermostability was observed even at elevated temperature (100 °C) with inhibitory activity increased by 1.14-fold compared to inhibitor activity at room temperature. Incubation at basic pH values for up to 60 min caused little reduction (0.25-fold) in the papain inhibitory activity of tirustatin. The stoichiometry of the papain-tirustatin interaction was 1.5: 1 and 28.8 pM of the inhibitor effected 50% inhibition. With an equilibrium dissociation constant of 8.74 x 10-8M for the papain enzyme, it is possible to evaluate the isolated protein as a non-competitive inhibitor. In addition, the protein extract of E. tirucalli even at the maximum concentration used (20 μg/mL), did not show a cytotoxic and mutagenic profile in a bacterial model. CONCLUSION The results presented in this work provide data that reinforce the idea of the potential use of proteins produced in E. tirucalli as pharmacological and biotechnological agents that can be exploited for the development of efficient drugs.
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Affiliation(s)
- Ana Carolina Pereira Milhm
- Laboratory of Biochemistry and Function of Plant Proteins, Department of Botany, Federal University of the State of Rio de Janeiro, Av. Pasteur, 458, Urca, Brazil.
| | - Luiz Felippe Sarmento Bonet
- Laboratory of Biochemistry and Function of Plant Proteins, Department of Botany, Federal University of the State of Rio de Janeiro, Av. Pasteur, 458, Urca, Brazil.
| | - Claudia Alessandra Fortes Aiub
- Laboratory of Genotoxicity, Department of Genetics and Molecular Biology, Federal University of the State of Rio de Janeiro, R. Frei Caneca, 94 - Centro, Brazil.
| | - César Luis Siqueira Junior
- Laboratory of Biochemistry and Function of Plant Proteins, Research Center on Agricultural Systems, Department of Botany, Federal University of the State of Rio de Janeiro, Av. Pasteur, 458, Urca, Brazil.
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Galvão BVD, Araujo-Lima CF, Santos MCPD, Seljan MP, Carrão-Dantas EK, Aiub CAF, Cameron LC, Ferreira MSL, Andrade Gonçalves ÉCBD, Felzenszwalb I. Plinia cauliflora (Mart.) Kausel (Jaboticaba) leaf extract: In vitro anti-Trypanosoma cruzi activity, toxicity assessment and phenolic-targeted UPLC-MS E metabolomic analysis. J Ethnopharmacol 2021; 277:114217. [PMID: 34038800 DOI: 10.1016/j.jep.2021.114217] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/02/2021] [Accepted: 05/17/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Plinia cauliflora (Mart.) Kausel, known as Brazilian grape or jaboticaba, is widely used in Brazilian traditional medicine to treat infectious and inflammatory disorders. However, several aspects of its biological potential remain unclear, such as toxicity and effects on pathogenic protozoa. AIM OF THE STUDY Investigate the phenolic composition, the in vitro and in silico toxicity profile, and the anti-Trypanosoma cruzi activity of the phenolics-enriched hydromethanolic extract of P. cauliflora leaf. MATERIAL AND METHODS Phytochemical analysis was performed ultra-performance liquid chromatography-mass spectrometry (UPLC-MSE). Mutagenicity, genotoxicity and eukaryotic cytotoxicity was evaluated by Ames test, cytokinesis-block micronucleus and colorimetric assays, respectively, alongside with a computational prediction of the major compound's pharmacokinetics and toxicity. Anti-T. cruzi activity was investigated on T. cruzi bloodstream trypomastigotes. RESULTS A total of 14 phenolic compounds were identified, including 11 flavonoids and 2 phenolic acids. No positive response regarding mutagenic potential was detected in Salmonella strains TA97, TA98, TA100, TA102, TA104, both in absence or presence of metabolic activation. The extract induced significant dose-response reduction on nuclear division indexes of HepG2 cells, suggesting cytostatic effects, with no micronuclei induction on cytokinesis-block micronucleus assay. Likewise, it also presented cytotoxic effects, inducing HepG2 and F C3H dose and time dependently cell death through cell membrane damage and more evidently by mitochondrial dysfunction. A dose-response curve of in vitro trypanocidal activity was observed against T. cruzi bloodstream trypomastigotes after 2 and 24 h of exposure. In silico predictions of most abundant compounds' structural alerts, pharmacokinetics and toxicity profile indicates a moderately feasible druglikeness profile and low toxicity for them, which is compatible with in vitro results. CONCLUSIONS The present study demonstrated that P. cauliflora leaf extract is a potential source of antiparasitic bioactive compounds, however it presents cytotoxic effects in liver cell lines.
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Affiliation(s)
- Bárbara Verena Dias Galvão
- Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Carlos Fernando Araujo-Lima
- Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Rio de Janeiro State University, Rio de Janeiro, Brazil; Laboratory of Cell Biology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil.
| | | | - Mariana Pulmar Seljan
- Laboratory of Bioactives, Nutritional Biochemistry Core, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Eduardo Kennedy Carrão-Dantas
- Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | | | - Luiz Claudio Cameron
- Genetics and Molecular Biology Department, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil; Laboratory of Protein Biochemistry, Center of Innovation in Mass Spectrometry, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Mariana Simões Larraz Ferreira
- Laboratory of Bioactives, Nutritional Biochemistry Core, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil; Laboratory of Protein Biochemistry, Center of Innovation in Mass Spectrometry, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Israel Felzenszwalb
- Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Bocayuva Tavares GD, Fortes Aiub CA, Felzenszwalb I, Carrão Dantas EK, Araújo-Lima CF, Siqueira Júnior CL. In vitro biochemical characterization and genotoxicity assessment of Sapindus saponaria seed extract. J Ethnopharmacol 2021; 276:114170. [PMID: 33932515 DOI: 10.1016/j.jep.2021.114170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/23/2021] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Sapindus saponaria, also popularly known as soapberry, has been used in folk medicinal values because of its therapeutic properties and several compounds in its composition, which represent a target in potential for drug discovery. However, few data about its potential toxicity has been reported. AIM OF THE STUDY Plant proteins can perform essential roles in survival, acting as defense mechanism, as well functioning as important molecular reserves for its natural metabolism. The aim of the current study was to investigate the in vitro toxicity profile of protein extract of S. saponaria and detect protein potentially involved in biological effects such as collagen hydrolysis and inhibition of viral proteases. MATERIALS AND METHODS Protein extract of soapberry seeds was investigated for its cytotoxic and genotoxic action using the Ames test. The protein extract was also subjected to a partial purification process of a protease and a protease inhibitor by gel chromatography filtration techniques and the partially isolated proteins were characterized biochemically. RESULTS Seed proteins extract of S. saponaria was evaluated until 100 μg/mL concentration, presenting cytotoxicity and mutagenicity in bacterial model mostly when exposed to exogenous metabolic system and causing cytotoxic and genotoxic effects in HepG2 cells. The purification and partial characterization of a serine protease (43 kDa) and a cysteine protease inhibitor (32.8 kDa) from protein extract of S. Saponaria, corroborate the idea of the biological use of the plant as an insecticide and larvicide. Although it shows cytotoxic, mutagenic and genotoxic effects. CONCLUSION The overall results of the present study provide supportive data on the potential use of proteins produced in S. saponaria seeds as pharmacological and biotechnological agents that can be further explored for the development of new drugs.
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Affiliation(s)
- Gustavo Duarte Bocayuva Tavares
- Laboratory of Biochemistry and Function of Plant Proteins, Department of Botany, Federal University of the State of Rio de Janeiro, Av. Pasteur, 458, Urca, Brazil.
| | - Claudia Alessandra Fortes Aiub
- Laboratory of Genotoxicity, Department of Genetics and Molecular Biology, Federal University of the State of Rio de Janeiro, R. Frei Caneca, 94, Centro, Brazil.
| | - Israel Felzenszwalb
- Department of Biophysics and Biometrics, State University of Rio de Janeiro, Av. 28 de Setembro, 87, Pavilhão Américo Piquet Carneiro - 4o. Andar, Vila Isabel, Rio de Janeiro, RJ, Brazil.
| | - Eduardo Kennedy Carrão Dantas
- Department of Biophysics and Biometrics, State University of Rio de Janeiro, Av. 28 de Setembro, 87, Pavilhão Américo Piquet Carneiro - 4o. Andar, Vila Isabel, Rio de Janeiro, RJ, Brazil.
| | - Carlos Fernando Araújo-Lima
- Department of Biophysics and Biometrics, State University of Rio de Janeiro, Av. 28 de Setembro, 87, Pavilhão Américo Piquet Carneiro - 4o. Andar, Vila Isabel, Rio de Janeiro, RJ, Brazil.
| | - César Luis Siqueira Júnior
- Laboratory of Biochemistry and Function of Plant Proteins, Research Center on Agricultural Systems, Department of Botany, Federal University of the State of Rio de Janeiro, Av. Pasteur, 458, Urca, Brazil.
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Araújo-Lima CF, Paula da Silva Oliveira J, Coscarella IL, Aiub CAF, Felzenszwalb I, Caprini Evaristo GP, Macedo AF. Metabolomic analysis of Cyrtopodium glutiniferum extract by UHPLC-MS/MS and in vitro antiproliferative and genotoxicity assessment. J Ethnopharmacol 2020; 253:112607. [PMID: 31982517 DOI: 10.1016/j.jep.2020.112607] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/09/2020] [Accepted: 01/20/2020] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Extracts of orchids have been traditionally used as human phytotherapeutics. Cyrtopodium flavum, for example, due to the analgesic and anti-inflammatory properties, beside the capacity of heal skin lesions has been focus of research. Also Cyrtopodium glutiniferum, an orchid found in the Brazilian southeastern rainforest, is known to synthesize anti-inflammatory glucomannans in the pseudobulbs, as other potentially therapeutic compounds. AIM OF THE STUDY We have reported the first metabolomic analysis focused on the phenols expression of the neotropical orchid Cyrtopodium glutiniferum Raddi, besides free radical scavenging, anti-inflammatory and antiproliferative activities, and the genotoxicity properties of the aqueous extract. MATERIAL AND METHODS The metabolomics of C. glutiniferum aqueous extract was performed through UHPLC-MSn acquisition. We have detected the scavenging potential of the extract using DPPH assay. The genotoxic potential was performed by Ames Test (0-5000 μg mL-1) and micronucleous assay (0-5000 μg mL-1) in RAW264.7 cells. The cytotoxic potential of the extract against RAW264.7 was tested by WST-1 assay (0-500 μg mL-1). And after all, the RAW264.7 cells were treated with non-cytotoxic concentrations of C. glutiniferum (0-50 μg mL-1) to evaluate the antiproliferative and anti-inflammatory potential, besides the mitochondrial activity. RESULTS From the 55 molecules identified, 45.5% belonged to the phenolic compounds database from Phenol Explorer, 29% to an in-house Orchidaceae molecules database, and 25.5% to both. Among the identified phenolic compounds, 18 subclasses were discriminated, being phenanthrenes the most abundant. Doses-dependent of C. glutiniferum extracts were able to induce DPPH free radicals scavenging and also to increase TA100 His+ revertants, in metabolic environment, showing mutagenicity just in the highest concentration, of 5 mg/plate. On Eukaryotic cell models, the extract also has induced dose-response and time-response cytotoxicity against RAW264.7 macrophages, mainly after 48 h and 72 h, even though the extract has not been able to induce the increase of micronucleated cells and mitotic index alteration on Micronucleus assay. The activation and proliferation of macrophages cultures were downregulated after 24 h and 48 h by the non-cytotoxic concentrations of the extract in a dose-dependent manner. CONCLUSIONS The Cyrtopodium glutiniferum metabolomics, anti-inflammatory and anti-proliferative properties observed in this study suggest a therapeutic efficacy of the orchid extract applied in folk medicine.
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Affiliation(s)
- Carlos Fernando Araújo-Lima
- Laboratory of Environmental Mutagenicity, Department of Biophysics and Biometry, Rio de Janeiro State University, UERJ, Rio de Janeiro, Brazil; Laboratory of Genotoxicity, Department of Genetics and Molecular Biology, Federal University of Rio de Janeiro State, UNIRIO, Rio de Janeiro, Brazil.
| | - Joana Paula da Silva Oliveira
- Integrated Laboratory of Plant Biology, Department of Botany, Institute of Biosciences, Federal University of Rio de Janeiro State, UNIRIO, Rio de Janeiro, Brazil.
| | - Isabella Leite Coscarella
- Laboratory of Genotoxicity, Department of Genetics and Molecular Biology, Federal University of Rio de Janeiro State, UNIRIO, Rio de Janeiro, Brazil.
| | - Claudia Alessandra Fortes Aiub
- Laboratory of Genotoxicity, Department of Genetics and Molecular Biology, Federal University of Rio de Janeiro State, UNIRIO, Rio de Janeiro, Brazil.
| | - Israel Felzenszwalb
- Laboratory of Environmental Mutagenicity, Department of Biophysics and Biometry, Rio de Janeiro State University, UERJ, Rio de Janeiro, Brazil.
| | - Geisa Paulino Caprini Evaristo
- Laboratório de Apoio ao Desenvolvimento Tecnológico (LADETEC), Federal University of Rio de Janeiro, UFRJ, Rio de Janeiro, Brazil.
| | - Andrea Furtado Macedo
- Integrated Laboratory of Plant Biology, Department of Botany, Institute of Biosciences, Federal University of Rio de Janeiro State, UNIRIO, Rio de Janeiro, Brazil.
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Castelo-Branco FS, de Lima EC, Domingos JLDO, Pinto AC, Lourenço MCS, Gomes KM, Costa-Lima MM, Araujo-Lima CF, Aiub CAF, Felzenszwalb I, Costa TEMM, Penido C, Henriques MG, Boechat N. New hydrazides derivatives of isoniazid against Mycobacterium tuberculosis: Higher potency and lower hepatocytotoxicity. Eur J Med Chem 2018; 146:529-540. [PMID: 29407978 DOI: 10.1016/j.ejmech.2018.01.071] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 10/25/2017] [Revised: 01/09/2018] [Accepted: 01/21/2018] [Indexed: 12/16/2022]
Abstract
Tuberculosis (TB) is one of the leading causes of death worldwide. The emergence of multi-drug resistant strains of Mycobacterium tuberculosis (Mtb) and TB-HIV co-infection are major public health challenges. The anti-TB drugs of first choice were developed more than 4 decades ago and present several adverse effects, making the treatment of TB even more complicated and the development of new chemotherapeutics for this disease imperative. In this work, we synthesized two series of new acylhydrazides and evaluated their activity against different strains of Mtb. Derivatives of isoniazid (INH) showed important anti-Mtb activity, some being more potent than all anti-TB drugs of first choice. Moreover, three compounds proved to be more potent than INH against resistant Mtb. The Ames test showed favorable results for two of these substances compared to INH, one of which presented expressly lower toxicity to HepG2 cells than that of INH. This result shows that this compound has the potential to overcome one of the main adverse effects of this drug.
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Affiliation(s)
- Frederico Silva Castelo-Branco
- Fundacao Oswaldo Cruz, Instituto de Tecnologia em Fármacos, Farmanguinhos-Fiocruz, Departamento de Sintese Farmacos, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil; Programa de Pos-Graduacao em Quimica da Universidade Federal do Rio de Janeiro, Instituto de Química, Departamento de Quimica Organica, 21941-909 Rio de Janeiro, RJ, Brazil
| | - Evanoel Crizanto de Lima
- Universidade Federal do Rio de Janeiro, Instituto de Quimica, Campus Macae, 27930-560 Macae, RJ, Brazil
| | - Jorge Luiz de Oliveira Domingos
- Universidade do Estado do Rio de Janeiro, Instituto de Quimica, Departamento de Quimica Organica, 20550-900 Rio de Janeiro, RJ, Brazil
| | - Angelo C Pinto
- Programa de Pos-Graduacao em Quimica da Universidade Federal do Rio de Janeiro, Instituto de Química, Departamento de Quimica Organica, 21941-909 Rio de Janeiro, RJ, Brazil
| | - Maria Cristina S Lourenço
- Fundacao Oswaldo Cruz, Instituto Nacional de Infectologia Evandro Chagas, Laboratório de Bacteriologia e Bioensaios em Micobacterias, 21045-900 Rio de Janeiro, RJ, Brazil
| | - Karen Machado Gomes
- Fundacao Oswaldo Cruz, Instituto Nacional de Infectologia Evandro Chagas, Laboratório de Bacteriologia e Bioensaios em Micobacterias, 21045-900 Rio de Janeiro, RJ, Brazil
| | - Mariana Marques Costa-Lima
- Laboratorio de Genotoxicidade, Departamento de Genetica e Biologia Molecular, Universidade Federal do Estado do Rio de Janeiro, 20211-010 Rio de Janeiro, RJ, Brazil
| | - Carlos Fernando Araujo-Lima
- Laboratorio de Genotoxicidade, Departamento de Genetica e Biologia Molecular, Universidade Federal do Estado do Rio de Janeiro, 20211-010 Rio de Janeiro, RJ, Brazil; Laboratorio de Mutagenese Ambiental, Departamento de Biofisica e Biometria, Universidade do Estado do Rio de Janeiro, 20551-030 Rio de Janeiro, RJ, Brazil; Programa de Pos-graduacao em Biociencias da Universidade do Estado do Rio de Janeiro, Instituto de Biologia, 20551-030 Rio de Janeiro, RJ, Brazil
| | - Claudia Alessandra Fortes Aiub
- Laboratorio de Genotoxicidade, Departamento de Genetica e Biologia Molecular, Universidade Federal do Estado do Rio de Janeiro, 20211-010 Rio de Janeiro, RJ, Brazil
| | - Israel Felzenszwalb
- Laboratorio de Mutagenese Ambiental, Departamento de Biofisica e Biometria, Universidade do Estado do Rio de Janeiro, 20551-030 Rio de Janeiro, RJ, Brazil
| | - Thadeu Estevam M M Costa
- Fundacao Oswaldo Cruz, Instituto de Tecnologia em Farmacos, Farmanguinhos-Fiocruz, Laboratorio de Farmacologia Aplicada, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil; Fundacao Oswaldo Cruz, Centro de Desenvolvimento Tecnologico em Saude, CDTS/INCT-IDN-Fiocruz, 21040-361 Rio de Janeiro, RJ, Brazil
| | - Carmen Penido
- Fundacao Oswaldo Cruz, Instituto de Tecnologia em Farmacos, Farmanguinhos-Fiocruz, Laboratorio de Farmacologia Aplicada, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil; Fundacao Oswaldo Cruz, Centro de Desenvolvimento Tecnologico em Saude, CDTS/INCT-IDN-Fiocruz, 21040-361 Rio de Janeiro, RJ, Brazil
| | - Maria G Henriques
- Fundacao Oswaldo Cruz, Instituto de Tecnologia em Farmacos, Farmanguinhos-Fiocruz, Laboratorio de Farmacologia Aplicada, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil; Fundacao Oswaldo Cruz, Centro de Desenvolvimento Tecnologico em Saude, CDTS/INCT-IDN-Fiocruz, 21040-361 Rio de Janeiro, RJ, Brazil
| | - Nubia Boechat
- Fundacao Oswaldo Cruz, Instituto de Tecnologia em Fármacos, Farmanguinhos-Fiocruz, Departamento de Sintese Farmacos, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil.
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Ramos de Rainho C, Machado Corrêa S, Luiz Mazzei J, Alessandra Fortes Aiub C, Felzenszwalb I. Genotoxicity of polycyclic aromatic hydrocarbons and nitro-derived in respirable airborne particulate matter collected from urban areas of Rio de Janeiro (Brazil). Biomed Res Int 2013; 2013:765352. [PMID: 23738331 PMCID: PMC3659438 DOI: 10.1155/2013/765352] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 04/11/2013] [Indexed: 11/23/2022]
Abstract
Air pollution toxic effects are mainly attributed to small inhalable particulates with an aerodynamic diameter of less than 2.5 µ m (PM 2.5). Our objective was to investigate mutagenic and clastogenic activity in PM samples collected in Rio de Janeiro. Samples were collected using a high-volume sampler at three sites: with low traffic and (2) and (3) with a heavy traffic. Six polycyclic aromatic hydrocarbons (PAHs) were quantified by gas chromatography/mass spectrometry (GC/MS). Salmonella typhimurium TA98 and the derivative strains YG1021 and YG1024 were used in mutagenicity assays in the presence of organic extracts (10-50 µ g/ plate) with and without exogenous metabolization. Allium cepa test was performed to evaluate possible cytotoxic and clastogenic activities. The highest PM 2.5 µ m (132.73 µ m/m(3)) and PAH values (1.22 ng/m(3) for benzo(a)pyrene) were detected at site 3. High mutagenic frameshift responses in absence and presence of metabolic activation were detected at site 3. The participation of nitroarenes and dinitroarenes was detected in the total mutagenicity of the extracts studied. The cytotoxic effect and the abnormalities detected by Allium cepa test can be attributed to the PAH nitroderivatives in the organic extracts. Evaluation of the genotoxicity of urban airborne particulate matter is important as a basis for decision making by regulatory authorities.
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Affiliation(s)
- Claudia Ramos de Rainho
- Universidade do Estado do Rio de Janeiro, Instituto de Biologia Roberto Alcantara Gomes, Departamento de Biofísica e Biometria, Laboratório de Mutagênese Ambiental, 20551-030 Rio de Janeiro, Brazil
| | - Sérgio Machado Corrêa
- Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia, Departamento de Química Ambiental, 27537-000 Resende, RJ, Brazil
| | - José Luiz Mazzei
- Fundação Oswaldo Cruz, Farmanguinhos Plataforma de Métodos Analíticos, 21040-360 Rio de Janeiro, Brazil
| | - Claudia Alessandra Fortes Aiub
- Universidade Federal do Estado do Rio de Janeiro, Instituto Biomédico, Departamento de Genética e Biologia Molecular, Laboratório de Genotoxicidade, 20211-040 Rio de Janeiro, Brazil
| | - Israel Felzenszwalb
- Universidade do Estado do Rio de Janeiro, Instituto de Biologia Roberto Alcantara Gomes, Departamento de Biofísica e Biometria, Laboratório de Mutagênese Ambiental, 20551-030 Rio de Janeiro, Brazil
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Rainho CR, Velho AMA, Corrêa SM, Mazzei JL, Aiub CAF, Felzenszwalb I. Prediction of health risk due to polycyclic aromatic hydrocarbons present in urban air in Rio de Janeiro, Brazil. Genet Mol Res 2013; 12:3992-4002. [PMID: 23479151 DOI: 10.4238/2013.february.28.6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Risk assessment can provide a comprehensive estimate of potential effects of contaminants under specific, well-defined, and well-described circumstances, providing quantitative relationships between exposure and effects to identify and to define areas of concern. We investigated the mutagenic activity of particulate matter in air samples collected from three sites in Rio de Janeiro city. Samples were collected using a high-volume sampler at Avenida Brasil, at Campus of Universidade do Estado do Rio de Janeiro, and at Rebouças Tunnel. Six polycyclic aromatic hydrocarbons were quantified by gas chromatography/mass spectrometry. Salmonella typhimurium TA98 and the derivative strains TA98/1.8-DNP(6), YG1021, and YG1024, commonly used in mutagenicity assays, were treated (10-50 µg/plate), with and without exogenous metabolization. The highest values for the polycyclic aromatic hydrocarbons were detected at Rebouças Tunnel. For chrysene, as an example, the concentration was nearly 200 times higher than that established by the US Environmental Protection Agency. Frequent traffic jams can place bus drivers who go through the Rebouças Tunnel at risk of exposure to up to 0.69 ng/m(3) benzo(a) pyrene. Independent of exogenous metabolization, mutagenicity was detected in strains YG1021 and YG1024 at all the sites, suggesting nitro and amino derivatives of polycyclic aromatic hydrocarbons. Rebouças Tunnel air samples gave the highest values for rev/µg and rev/m(3). This could be due to the fact that the long, enclosed passageway through a mountain restricts ventilation. The cancer risk estimate in this study was 10(-3) for the benzo(a)pyrene, at the two sites, indicating a high risk.
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Affiliation(s)
- C R Rainho
- Laboratório de Mutagênese Ambiental, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
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Nogueira NPA, Reis PA, Laranja GAT, Pinto AC, Aiub CAF, Felzenszwalb I, Paes MC, Bastos FF, Bastos VLFC, Sabino KCC, Coelho MGP. In vitro and in vivo toxicological evaluation of extract and fractions from Baccharis trimera with anti-inflammatory activity. J Ethnopharmacol 2011; 138:513-522. [PMID: 22015234 DOI: 10.1016/j.jep.2011.09.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 09/05/2011] [Accepted: 09/08/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Baccharis trimera (Less) DC. (Asteraceae), popularly known in Brazil as "carqueja", have been used in folk medicine to treat gastrointestinal, hepatic and renal diseases, and inflammatory processes as rheumatism. AIM OF THE STUDY To evaluate the in vitro and in vivo toxicological effects of anti-inflammatory Baccharis trimera aqueous extract and fractions. MATERIALS AND METHODS Aqueous extract of Baccharis trimera (AEBt) was produced by infusion in boiling water. After lyophylization AEBt was extracted with 80% ethanol, originating the ethanolic supernatant fraction (EFBt) and the aqueous sediment fraction (AFBt). Anti-inflammatory properties of AEBt, EFBt or AFBt (3, 30 or 300 μg/kg b.w.) were evaluated by the carrageenan-induced mouse paw edema using indomethacin (10mg/kg) as positive control. The growth of rat hepatoma cells (HTC) and human embryo kidney epithelial cells (HEK) was determined by protein staining assay. Cytotoxicity was assayed by the tetrazolium salt (MTT) reduction. Cyclosporin was used as reference cytotoxic drug for spleen cells and doxorubicin for HTC and HEK cells. For in vivo toxicological evaluation SW male mice were daily and oral (gavage) treated with extract/fractions at 4.2mg/kg or 42 mg/kg during 15 days. After treatment liver or kidney cells were submitted to comet assay to determine the DNA damage index, and the glutathione S-transferase activity was assayed towards ETHA (class Pi) and CDNB (several classes). Mutagenicity was evaluated by the Ames test using Salmonella typhimurium strains TA97, TA98, TA100, and TA102. RESULTS The anti-inflammatory effects of EFBt were higher than those of AEBt or AFBt. Mice treatment (3-300 μg/kg) with AFBt reduced the paw edema (3h) at lower levels (29.2-37.3%; P<0.01), than those observed for AEBt (44.7-54.2%; P<0.001), EFBt (49.3-58.2%; P<0.001) or indomethacin (64.6%, P<0.001, 10mg/kg). The growth of kidney cells (HEK) was inhibited by AEBt (IC(50) 182.6 μg/ml), EFBt (IC(50) 78.1 μg/ml) and AFBt (IC(50) 86.2 μg/ml), with lower effects on HTC hepatic cell (IC(50) 308.8 μg/ml, 396.5 μg/ml and 167.9 μg/ml, respectively). As evaluated by MTT test, AFBt exhibited cytotoxicity for HEK cells (IC(50) 372.5 μg/ml), but none for HTC ones; by the way, AFBt stimulated spleen cells (EC(50) 2.2 μg/ml) while cyclosporine, a cytotoxic reference drug inhibited them with IC(50) of 0.42 μg/ml; the IC(50) for doxorubicin for HEK and HTC cells was 0.28 μg/ml and 14.4 μg/ml, respectively, at 96h. No mutagenic potential was observed. Mice treatment with AEBt or AFBt at 42 mg/kg for 15 days altered the kidney relative weight, but not at 4.2mg/kg. Baccharis trimera did not change liver, spleen or popliteal lymph node relative weight. DNA damage index of kidney cells was observed on mice treated with AEBt/AFBt, but not on animals treated with EFBt, while DNA lesions were detected on liver cells only after AFBt treatment. The general activities of hepatic GST and Pi GST were reduced by EFBt and AFBt treatment, respectively. CONCLUSIONS Baccharis trimera did not show mutagenicity, inhibited the GST activity, a hepatic detoxification enzyme, and induced in vivo (genotoxicity) and in vitro toxicological effects to kidney cells.
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Affiliation(s)
- N P A Nogueira
- Departamento de Bioquímica, Instituto de Biologia Roberto Alcantara Gomes, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Av. Professor Manoel de Abreu, 444, PAPC, 4o andar, CEP 20550-170, Rio de Janeiro, RJ, Brazil
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Aiub CAF, Gadermaier G, Silva IO, Felzenszwalb I, Pinto LFR, Ferreira F, Eckl P. N-nitrosodiethylamine genotoxicity evaluation: a cytochrome P450 induction study in rat hepatocytes. Genet Mol Res 2011. [PMID: 22002127 DOI: 10.4238/2011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
In rats, N-nitrosodiethylamine (NDEA) induces tumors mainly in the liver. This could be because various enzymes are responsible for the metabolic activation of NDEA, besides the hepatic NDEA metabolizing enzyme, CYP2E1. We examined NDEA genotoxicity and cytotoxicity in primary cultures of female rat hepatocytes; we also looked at how it affected CYP mRNA expression. Single incubation with 0.9% NaCl resulted in a mean of 0.2% apoptotic cells, which doubled with 105 μg NDEA/mL. The frequency of necrosis with NDEA treatment was also doubled. Besides the cytotoxic effects, there was also a 4-fold decrease in mitotic index and a 3-fold decrease in the percentage of cells with micronuclei. A significant increase in micronucleus cells when hepatocytes were incubated with 2.1 μg NDEA/mL suggests that DNA repair was inactive. The chromosomal aberration evaluation revealed a discrete dose-response curve. Treatment with NDEA induced increases in CYP mRNA: CYP2B2 (1.8 times) and CYP2E1 (1.6 times) with non-cytotoxic NDEA concentrations (0.21-21 μg/mL). CYP2B1 mRNA levels decreased at 0.21 μg NDEA/mL (2.5-fold), while CYP4A3 mRNA decreased 1.3-fold. NDEA treatment at 2.1 μg/ mL induced a 1.9-fold increase in CYP3A1 mRNA. Understanding the cumulative effects in target cells during precarcinogenesis is crucial to understanding the mode of action of potential carcinogens and in order to develop comprehensive chemical toxicity profiles.
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Affiliation(s)
- C A F Aiub
- Department of Cell Biology, Division of Genetics, Salzburg University, Salzburg, Austria.
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Aiub CAF, Gadermaier G, Ferreira F, Felzenszwalb I, Eckl P, Pinto LFR. <i>N</i>–nitrosodiethylamine cytochrome P450 induction and cytotoxicity evaluation in primary cultures of rat hepatocytes. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/ajmb.2011.12009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Aiub CAF, Mazzei JL, Pinto LFR, Felzenszwalb I. Evaluation of nitroreductase and acetyltransferase participation in N-nitrosodiethylamine genotoxicity. Chem Biol Interact 2006; 161:146-54. [PMID: 16720019 DOI: 10.1016/j.cbi.2006.03.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Revised: 03/29/2006] [Accepted: 03/30/2006] [Indexed: 11/25/2022]
Abstract
N-Nitroso compounds, such as N-nitrosodiethylamine (NDEA), are a versatile group of chemical carcinogens, being suspected to be involved in gastrointestinal tumors in humans. The intestinal microflora can modify a wide range of environmental chemicals either directly or in the course of enterohepatic circulation. Nitroreductases from bacteria seem to have a wide spectrum of substrates, as observed by the reduction of several nitroaromatic compounds, but their capacity to metabolize N-nitroso compounds has not been described. To elucidate the participation of nitroreductase or acetyltransferase enzymes in the mutagenic activity of NDEA, the bacterial (reverse) mutation test was carried out with the strains YG1021 (nitroreductase overexpression), YG1024 (acetyltransferase overexpression), TA98NR (nitroreductase deficient), and TA98DNP6 (acetyltrasferase deficient), and YG1041, which overexpresses both enzymes. The presence of high levels of acetyltransferase may generate toxic compounds that must be eliminated by cellular processes or can lead to cell death, and consequently decrease the mutagenic effect, as can be observed by the comparison of strain TA98DNP6 with the strains TA98 and YG1024. The slope curves for TA98 strain were 0.66 rev/microM (R(2) = 0.51) and 52.8 rev/microM (R(2) = 0.88), in the absence and presence of S9 mix, respectively. For YG1024 strain, the slope curve, in the presence of S9 mix was 6897 rev/microM (R(2) = 0.78). Our data suggest that N-nitroso compounds need to be initially metabolized by enzymes such as cytochromes P450 to induce mutagenicity. Nitroreductase stimulates toxicity, while acetyltransferase stimulates mutagenicity, and nitroreductase can neutralize the mechanism of mutagenicity generating innoccuos compounds, probably by acting on the product generated after NDEA activation.
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Affiliation(s)
- Claudia Alessandra Fortes Aiub
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Brazil.
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Aiub CAF, Mazzei JL, Pinto LFR, Felzenszwalb I. Participation of BER and NER pathways in the repair of DNA lesions induced at low N-nitrosodiethylamine concentrations. Toxicol Lett 2004; 154:133-42. [PMID: 15475187 DOI: 10.1016/j.toxlet.2004.07.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2004] [Revised: 07/22/2004] [Accepted: 07/26/2004] [Indexed: 11/28/2022]
Abstract
In the present work, we evaluated (p < 0.05) the participation of base excision repair (BER) and nucleotide excision repair (NER) mechanisms in repairing DNA lesions induced by N-nitrosodiethylamine (NDEA) at 1.5 ng/mL-36.5 microg/mL, through cell survival, in different single and double Escherichia coli DNA repair mutants (uvrA, uvrB, uvrC, fpg, nth, xthA, fpg/nth, uvrA/fpg, fpg/xthA, mutY, and fpg/mutY), using pre-incubation periods of 90 min. Mutant strains BH20 (fpg) and AB1886 (uvrA) showed microsomal enzyme (S9 mix) independent NDEA cytotoxicity. Cytotoxicity was also detected at lowest NDEA concentrations, in the presence of S9 mix, with strains BH980 (mutY) and BH990 (fpg/mutY). NDEA cytotoxicity, without S9 mix, was detected for mutant strains AB1884 (uvrC) and AB1885 (uvrB). Through SOS chromotest with 90 min of pre-incubation for uvrA and nth strains, only NER was shown to be required for repairing NDEA-induced lesions with or without metabolic activation. PQ37 and PQ66 strains, both uvrA mutants, showed different levels of NDEA sensitivity. The findings suggest that, under the used conditions, and at low concentrations, NDEA-induced lesions require both repair pathways.
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Affiliation(s)
- Claudia Alessandra Fortes Aiub
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Av. 28 de Setembro, 87 fds., 4 Andar, 20551-030 Rio de Janeiro, Brazil
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Aiub CAF, Pinto LFR, Felzenszwalb I. Standardization of conditions for the metabolic activation of N-nitrosodiethylamine in mutagenicity tests. Genet Mol Res 2004; 3:264-72. [PMID: 15266397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Like all nitrosamines, N-nitrosodiethylamine (NDEA) requires metabolic activation in order to exert its carcinogenic effects. This activation involves cytochrome P450s (CYP), which generates unstable metabolites that react with the DNA of cells in the immediate vicinity of metabolite formation. Although NDEA is carcinogenic, it has been considered a weak mutagen in classic genotoxicity assays. We used optimized Salmonella/mammalian microsome genotoxicity assays to assess the mutagenicity and toxicity of low concentrations of NDEA. Using a fixed concentration of NDEA (36.5 mg/ml), we varied the length of preincubation in the presence of different concentrations of an S9 metabolic activation mixture. Salmonella typhimurium strains TA97 and TA102 were resistant to NDEA-induced mutagenesis, even after a preincubation of up to 120 min and the use of different concentrations of the S9 mix. Strain TA98 was susceptible to mutagenesis by NDEA in the absence of the S9 mix and after preincubation with NDEA for 90 min. When bacteria of this strain were preincubated with NDEA for 60 min, mutagenesis was detected at an S9 mix concentration >9.55 mg/ml. NDEA also induced mutagenesis in strain TA100 after preincubation for 90 or 120 min, and this effect was dependent on the S9 concentration. E. coli strain BH990 also showed a concentration-dependent response, with only 60% of the cells surviving after a 120-min preincubation with NDEA in the presence of 19.1 mg S9 mix/ml.
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Affiliation(s)
- Claudia Alessandra Fortes Aiub
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. 28 de setembro, 87, 20551-030 Rio de Janeiro, RJ, Brasil
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Abstract
N-Nitrosodiethylamine (NDEA) requires metabolic activation by cytochrome P450 enzymes, leading to electrophile species that react in DNA. Although, carcinogenicity is not an end point in genotoxicity assays, NDEA has been considered a weak carcinogen. In this study, we carried out an analysis of the mutagenicity at low concentrations of NDEA. Using SOS chromotest in the presence of metabolic activation, we detected positive mutagenicity response for NDEA doses between 0.75 and 36.46 microg/ml. In Ames test, using more sensitive strains in the presence of S9 metabolic activation mixture (S9 mix), positive results were also detected for NDEA doses between 1.01 x 10(-3) and 50.64 x 10(-3 microg per plate. Our results indicate that NDEA mutagenicity can be detected at low concentrations when more sensitive conditions are used.
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Affiliation(s)
- Claudia Alessandra Fortes Aiub
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Av. 28 de setembro, 87 fds., 4 andar, 20551-030 Rio de Janeiro, Brazil
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Fortes Aiub CA, Bortolini R, Arrieira Azambuja A, Alves Filho JCF, Bordignon Nunes F, Rodrigues de Oliveira J. Alterations in the indexes of apoptosis and necrosis induced by galactosamine in the liver of Wistar rats treated with fructose-1,6-bisphosphate. Hepatol Res 2003; 25:83-91. [PMID: 12644043 DOI: 10.1016/s1386-6346(02)00171-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Galactosamine (GalN) is a hepatotoxic agent, which under determined situations provokes metabolic and energetic depletion as well as alterations in permeability, leading to cellular death. At the same time, it is known that fructose-1,6-bisphosphate (FBP) helps maintain cell energy levels and protects the cell against this lesive agent. We submitted two groups of male Wistar rats to the harmful intraperitoneal doses of GalN (400 mg/kg), one of which simultaneously received FBP (2 g/kg). Techniques were used in the analysis of the cellular components, adenosine triphosphate (ATP) and hepatic calcium and a close relationship between the types of cellular death unchained by these agents was established. The liver of the rats treated with GalN showed energy depletion and concomitant increase calcium in the hepatic tissue, which provoked higher levels of necrosis leading to reduce cellular viability. On the other hand, the group which had received GalN+FBP maintained calcium levels close to the control values and the energy rate did not decrease as much as in the GalN only group, but recovered the control values, within a period of 48 h. At the same time, the degree of apoptosis was greater than in the GalN group. This fact suggests that the FBP maintains cellular levels of ATP, thus protecting the cell from the toxic action of GalN, reducing the percentage of dead cells and causing an alteration in the pattern of the cell death, whereby there is an increase in the rate of apoptosis and a decrease in that of necrosis.
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