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Alderete BL, da Silva J, Godoi R, da Silva FR, Taffarel SR, da Silva LP, Garcia ALH, Júnior HM, de Amorim HLN, Picada JN. Evaluation of toxicity and mutagenicity of a synthetic effluent containing azo dye after Advanced Oxidation Process treatment. Chemosphere 2021; 263:128291. [PMID: 33297233 DOI: 10.1016/j.chemosphere.2020.128291] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [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: 08/03/2020] [Revised: 09/02/2020] [Accepted: 09/06/2020] [Indexed: 06/12/2023]
Abstract
Approximately 20% industrial water pollution comes from textile dyeing process, with Azo dyes being a major problem in this scenario and requiring new forms of efficient treatment. Effluent treatments using the Advanced Oxidation Processes (AOP) are justified by the potential of application in the dyed effluent treatments once they can change the Azo dye chemical structure. Thus, this study aimed to evaluate the toxicity and mutagenic capacity of a synthetic effluent containing Amido Black 10B (AB10B) azo dye before treatment with AOP, named Gross Synthetic Effluent (GSE), and after the AOP, named Treated Synthetic Effluent (TSE). Daphnia magna and Allium cepa tests were used to evaluate acute toxicity effects and chromosomal mutagenesis, respectively. The Salmonella/microsome assay was performed to evaluate gene mutations. In silico assays were also performed aiming to identify the mutagenic and carcinogenic potential of the degradation byproducts of AB10B. There was 100% immobility to D. magna after 24 h and 48 h of treatments with TSE, showing EC50 values around 5%, whereas GSE did not show acute toxicity. However, GSE induced chromosomal mutations in A. cepa test. Both GSE and TSE were not able to induce gene mutations in S. typhimurium strains. These effects can be associated with two byproducts generated with the cleavage of the azo bonds of AB10B, 4-nitroaniline and -2-7-triamino-8-hydroxy-3-6-naphthalinedisulfate (TAHNDS). In conclusion, AOP is an efficient method to reduce the mutagenicity of synthetic effluent containing AB10B and additional methods should be applied aiming to reduce the toxicity.
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Affiliation(s)
- Bárbara Lopes Alderete
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology. PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health), 92425-900, Canoas, RS, Brazil
| | - Juliana da Silva
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology. PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health), 92425-900, Canoas, RS, Brazil; La Salle University, Laboratory of Genetic Toxicology. PPGSDH (Professional Master's Degree in Health and Human Development) and Academic Master in Environmental Impact Assessment, Canoas, RS, Brazil.
| | - Rafael Godoi
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology. PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health), 92425-900, Canoas, RS, Brazil; La Salle University, Laboratory of Genetic Toxicology. PPGSDH (Professional Master's Degree in Health and Human Development) and Academic Master in Environmental Impact Assessment, Canoas, RS, Brazil
| | - Fernanda Rabaioli da Silva
- La Salle University, Laboratory of Genetic Toxicology. PPGSDH (Professional Master's Degree in Health and Human Development) and Academic Master in Environmental Impact Assessment, Canoas, RS, Brazil
| | - Silvio Roberto Taffarel
- La Salle University, Laboratory of Genetic Toxicology. PPGSDH (Professional Master's Degree in Health and Human Development) and Academic Master in Environmental Impact Assessment, Canoas, RS, Brazil
| | - Lucas Pisoni da Silva
- La Salle University, Laboratory of Genetic Toxicology. PPGSDH (Professional Master's Degree in Health and Human Development) and Academic Master in Environmental Impact Assessment, Canoas, RS, Brazil
| | - Ana Leticia Hilario Garcia
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology. PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health), 92425-900, Canoas, RS, Brazil
| | - Horst Mitteregger Júnior
- Laboratory of Ecotoxicology, SENAI, Institute of Technology in Leather and the Environment, 93600-000, Estância Velha, RS, Brazil
| | | | - Jaqueline Nascimento Picada
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology. PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health), 92425-900, Canoas, RS, Brazil.
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Rossetti ML, Almeida da Silva PE, Salvato RS, Reis AJ, Schiefelbein SH, von Groll A, Barcellos RB, Maschmann R, Esteves LS, Spies F, Trespach RR, Dalla Costa ER, Neubauer de Amorim HL. A highly rifampicin resistant Mycobacterium tuberculosis strain emerging in Southern Brazil. Tuberculosis (Edinb) 2020; 125:102015. [PMID: 33137698 DOI: 10.1016/j.tube.2020.102015] [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] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 10/08/2020] [Accepted: 10/18/2020] [Indexed: 11/17/2022]
Abstract
Here we described phenotypical, molecular and epidemiological features of a highly rifampicin-resistant Mycobacterium tuberculosis strain emerging in Southern Brazil, that carries an uncommon insertion of 12 nucleotides at the codon 435 in the rpoB gene. Employing a whole-genome sequencing-based study on drug-resistant Mycobacterium tuberculosis strains, we identified this emergent strain in 16 (9.19%) from 174 rifampicin-resistant clinical strains, all of them belonging to LAM RD115 sublineage. Nine of these 16 strains were available to minimum inhibitory concentration determination and for all of them was found a high rifampicin-resistance level (≥to 32 mg/L). This high resistance level could be explained by structural changes into the RIF binding site of RNA polymerase caused by the insertions, and consequent low-affinity interaction with rifampicin complex confirmed through protein modeling and molecular docking simulations. Epidemiological investigation showed that most of the individuals (56.25%) infected by the studied strains were prison inmate individuals or that spent some time in prison. The phylogenomic approach revealed that strains carrying on insertion belonged to same genomic cluster, evidencing a communal transmission chain involving inmate individuals and community. We stress the importance of tuberculosis genomic surveillance and introduction of measures to interrupt Mycobacterium tuberculosis transmission chain in this region.
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Affiliation(s)
- Maria Lucia Rossetti
- Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada a Saúde, Universidade Luterana do Brasil (ULBRA), Canoas, Rio Grande do Sul, Brazil; Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Pedro Eduardo Almeida da Silva
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Richard Steiner Salvato
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Centro Estadual de Vigilância em Saúde, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil; Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
| | - Ana Júlia Reis
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Sun Hee Schiefelbein
- Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada a Saúde, Universidade Luterana do Brasil (ULBRA), Canoas, Rio Grande do Sul, Brazil; Centro de Desenvolvimento Científico e Tecnológico (CDCT), Centro Estadual de Vigilância em Saúde, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Andrea von Groll
- Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada a Saúde, Universidade Luterana do Brasil (ULBRA), Canoas, Rio Grande do Sul, Brazil
| | - Regina Bones Barcellos
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Centro Estadual de Vigilância em Saúde, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil; Universidade Federal do Rio de Janeiro, Faculdade de Medicina, Programa Acadêmico de Tuberculose, Programa de Pós-Graduação em Clínica Médica, Rio de Janeiro, RJ, Brazil
| | - Raquel Maschmann
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Centro Estadual de Vigilância em Saúde, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Leonardo Souza Esteves
- Universidade Federal do Rio de Janeiro, Faculdade de Medicina, Programa Acadêmico de Tuberculose, Programa de Pós-Graduação em Clínica Médica, Rio de Janeiro, RJ, Brazil
| | - Fernanda Spies
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Centro Estadual de Vigilância em Saúde, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Rubia Raubach Trespach
- Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada a Saúde, Universidade Luterana do Brasil (ULBRA), Canoas, Rio Grande do Sul, Brazil
| | - Elis Regina Dalla Costa
- Universidade Federal do Rio de Janeiro, Faculdade de Medicina, Programa Acadêmico de Tuberculose, Programa de Pós-Graduação em Clínica Médica, Rio de Janeiro, RJ, Brazil
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Coelho MB, Costa ERD, Vasconcellos SEG, Linck N, Ramos RM, Amorim HLND, Suffys PN, Santos AR, Silva PEAD, Ramos DF, Silva MSN, Rossetti MLR. Sequence and structural characterization of tbnat gene in isoniazid-resistant Mycobacterium tuberculosis: identification of new mutations. Mutat Res 2011; 712:33-39. [PMID: 21514309 DOI: 10.1016/j.mrfmmm.2011.03.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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: 01/10/2011] [Revised: 03/30/2011] [Accepted: 03/31/2011] [Indexed: 05/30/2023]
Abstract
The present study was carried out to investigate the presence of polymorphism in the N-acetyltransferase gene of 41 clinical isolates of Mycobacterium tuberculosis, that were resistant to isoniazid (INH) with no mutations in the hot spots of the genes previously described to be involved in INH resistance (katG, inhA and ahpC). We observed single nucleotide polymorphisms (SNPs) in ten of these, including the G619A SNP in five isolates and an additional four so far un-described mutations in another five isolates. Among the latter SNPs, two were synonymous (C276T, n=1 and C375G, n=3), while two more non-synonymous SNPs were composed of C373A (Leu→Met) and T503G (Met→Arg) were observed in respectively one and two isolates. Molecular modeling and structural analysis based in a constructed full length 3D models of wild type TBNAT (TBNAT_H37Rv) and the isoforms (TBNAT_L125M and TBNAT_M168R) were also performed. The refined models show that, just as observed in human NATs, the carboxyl terminus extends deep within the folded enzyme, into close proximity to the buried catalytic triad. Analysis of tbnat that present non-synonymous mutations indicates that both substitutions are plausible to affect enzyme specificity or acetyl-CoA binding capacity. The results contribute to a better understanding of structure-function relationships of NATs. However, further investigation including INH-sensitive strains as a control group is needed to get better understanding of the possible role of these new mutations on tuberculosis control.
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Affiliation(s)
- Millene Borges Coelho
- Post-Graduation Program in Applied Genetics and Toxicology Program, Lutheran University of Brazil (PPGGTA/ULBRA), Canoas, RS, Brazil
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Abstract
Currently, in order to accelerate the process of drug development and also reduce costs, many of the experimental assays related to lead discovery and lead optimization processes are being replaced by computational, in silico, methods. In this context, the LIE (linear interaction energy) method has been used to calculate binding free energies for widely different compounds by averaging interaction energies obtained from molecular dynamics (MD) or Monte Carlo (MC) simulations. In particular, the combination of docking and affinity predictions with the LIE method can thus save valuable resources in lead discovery and optimization projects. This review presents a description of LIE methodology and some recent studies that illustrate the importance and utility of the method in the field of pharmaceutical research.
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