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Fermiano MH, das Neves AR, da Silva F, Barros MSA, Vieira CB, Stein AL, Frizon TEA, Braga AL, de Arruda CCP, Parisotto EB, Saba S, Rafique J, Riul TB. Selenium-Containing (Hetero)Aryl Hybrids as Potential Antileishmanial Drug Candidates: In Vitro Screening against L. amazonensis. Biomedicines 2024; 12:213. [PMID: 38255318 PMCID: PMC10812941 DOI: 10.3390/biomedicines12010213] [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: 10/13/2023] [Revised: 12/29/2023] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
Leishmaniasis remains a significant global health concern, with current treatments relying on outdated drugs associated with high toxicity, lengthy administration, elevated costs, and drug resistance. Consequently, the urgent need for safer and more effective therapeutic options in leishmaniasis treatment persists. Previous research has highlighted selenium compounds as promising candidates for innovative leishmaniasis therapy. In light of this, a library of 10 selenium-containing diverse compounds was designed and evaluated in this study. These compounds included selenium-substituted indole, coumarin, chromone, oxadiazole, imidazo[1,2-a]pyridine, Imidazo[2,1-b]thiazole, and oxazole, among others. These compounds were screened against Leishmania amazonensis promastigotes and intracellular amastigotes, and their cytotoxicity was assessed in peritoneal macrophages, NIH/3T3, and J774A.1 cells. Among the tested compounds, MRK-106 and MRK-108 displayed the highest potency against L. amazonensis promastigotes with reduced cytotoxicity. Notably, MRK-106 and MRK-108 exhibited IC50 values of 3.97 µM and 4.23 µM, respectively, and most of the tested compounds showed low cytotoxicity in host cells (CC50 > 200 µM). Also, compounds MRK-107 and MRK-113 showed activity against intracellular amastigotes (IC50 18.31 and 15.93 µM and SI 12.55 and 10.92, respectively). In conclusion, the identified selenium-containing compounds hold potential structures as antileishmanial drug candidates to be further explored in subsequent studies. These findings represent a significant step toward the development of safer and more effective therapies for leishmaniasis, addressing the pressing need for novel and improved treatments.
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Affiliation(s)
- Maria Helena Fermiano
- Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil (A.R.d.N.)
| | - Amarith Rodrigues das Neves
- Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil (A.R.d.N.)
| | - Fernanda da Silva
- Instituto de Biociências (INBIO), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil
| | | | - Camila Barbosa Vieira
- LABSO, Instituto de Química (IQ), Universidade Federal de Goiás (UFG), Goiânia 74690-900, GO, Brazil (S.S.)
| | - André L. Stein
- Departamento de Química, Universidade Federal de Mato Grosso (UFMT), Cuiabá 78060-900, MT, Brazil
| | - Tiago Elias Allievi Frizon
- Departamento de Energia e Sustentabilidade, Universidade Federal de Santa Catarina (UFSC), Campus Araranguá, Araranguá 88905-120, SC, Brazil
| | - Antonio Luiz Braga
- Departamento de Química, Universidade Federal de Santa Catarina (UFSC), Florianópolis 88040-970, SC, Brazil
| | - Carla Cardozo Pinto de Arruda
- Instituto de Biociências (INBIO), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil
| | - Eduardo Benedetti Parisotto
- Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil (A.R.d.N.)
| | - Sumbal Saba
- LABSO, Instituto de Química (IQ), Universidade Federal de Goiás (UFG), Goiânia 74690-900, GO, Brazil (S.S.)
| | - Jamal Rafique
- Instituto de Química (INQUI), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79074-460, MS, Brazil;
- LABSO, Instituto de Química (IQ), Universidade Federal de Goiás (UFG), Goiânia 74690-900, GO, Brazil (S.S.)
| | - Thalita Bachelli Riul
- Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil (A.R.d.N.)
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Magalhães LS, Strelow DN, Paim MP, Rech TDST, Krüger LD, Braga AL, Neto JSS, Brüning CA, Bortolatto CF. Anxiolytic-like action of 3-((4-methoxyphenyl)selanyl)-2-phenylbenzofuran (SeBZF3) in mice: A possible contribution of the serotonergic system. Pharmacol Biochem Behav 2023; 232:173651. [PMID: 37793485 DOI: 10.1016/j.pbb.2023.173651] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 08/23/2023] [Accepted: 09/29/2023] [Indexed: 10/06/2023]
Abstract
Anxiety disorders, characterized by high prevalence rates, cause psychiatric disabilities and are related to impairments in serotoninergic system function. Frequent anxiety recurrence, resistance, and drug adverse effects have driven searches for new therapies. We initially evaluated the anxiolytic-like activity of 3-selanyl-benzo[b]furan compounds (SeBZF1-5) (50 mg/kg, i.g.) in male Swiss mice using the light-dark test (LDT). The compound 3-((4-methoxyphenyl)selanyl)-2-phenylbenzofuran (SeBZF3) exhibited anxiolytic-like activity. SeBZF3 anxiolytic-like effects were also observed in the novelty-suppressed feeding test (NSFT) (50 mg/kg) and elevated plus-maze test (EPMT) (25 and 50 mg/kg). In the EPMT, anxiolytic-like effects of SeBZF3 (50 mg/kg) were abolished by pretreatment with p-chlorophenylalanine, a selective tryptophan hydroxylase inhibitor (100 mg/kg, i.p. for 4 days), suggesting the involvement of serotonergic mechanisms. Furthermore, we conducted experiments to investigate the synergistic effects of SeBZF3 subeffective doses (5 mg/kg, i.g.) in combination with fluoxetine (a selective serotonin reuptake inhibitor, 5 mg/kg, i.p.) or buspirone (a partial agonist of the 5-HT1A receptor, 2 mg/kg, i.p.). This coadministration resulted in pronounced synergistic effects. We also examined the effects of repeated oral treatment with SeBZF3 at doses of 1 and 5 mg/kg over 14 days and both reduced anxiety signals. In vitro and ex vivo findings revealed that SeBZF3 inhibited cerebral MAO-A activity. These findings collectively imply the potential involvement of serotonergic mechanisms in the anxiolytic-like activity of SeBZF3 in mice. These data offer contributions to the research field of organoselenium compounds and anxiolytics, encouraging the broadening of the search for new effective drugs while offering improved side effect profiles.
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Affiliation(s)
- Larissa Sander Magalhães
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil
| | - Dianer Nornberg Strelow
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil
| | - Mariana Parron Paim
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil
| | - Taís da Silva Teixeira Rech
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil
| | - Letícia Devantier Krüger
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil
| | - Antonio Luiz Braga
- Programa de Pós-graduação em Química (PPGQ), Laboratório de Síntese de Derivados de Selênio e Telúrio (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, CEP 88040- 900 Florianópolis, Santa Catarina, Brazil
| | | | - César Augusto Brüning
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil.
| | - Cristiani Folharini Bortolatto
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900, Pelotas, RS, Brazil.
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Rech TDST, Ribeiro EH, Castro ET, Alves AG, Strelow DN, Neto JSS, Braga AL, Brüning CA, Bortolatto CF. Antidepressant Potential of a Functionalized 3-Selanyl Benzo[ b]Furan Compound in Mice: Focus on the Serotonergic System. ACS Chem Neurosci 2023; 14:1181-1192. [PMID: 36853167 DOI: 10.1021/acschemneuro.2c00816] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023] Open
Abstract
The present study investigated the antidepressant-like potential of a functionalized 3-selanyl benzo[b]furan (SeBZF) in male Swiss mice. To evaluate possible antidepressant-like actions, the compounds SeBZF1-5 (50 mg/kg, intragastric, i.g., route) were acutely screened in the tail suspension tests (TSTs). The compound 3-((4-methoxyphenyl)selanyl)-2-phenylbenzofuran (SeBZF3) was then selected. Dose-response and time-response curves revealed that SeBFZ3 exerts antidepressant-like effects in the TST (5-50 mg/kg) and forced swimming test (FST; 50 mg/kg). Additional tests demonstrated that pretreatment with receptor antagonists WAY100635 (5-HT1A; 0.1 mg/kg, subcutaneous route), ketanserin (5-HT2A/C; 1 mg/kg, intraperitoneal, i.p.), or ondansetron (5-HT3; 1 mg/kg, i.p.) blocked the SeBZF3 antidepressant-like effects (50 mg/kg) in the TST. In addition, the coadministration of subeffective doses of SeBZF3 (1 mg/kg, i.g.) and fluoxetine (a selective serotonin reuptake inhibitor; 5 mg/kg, i.p.) produced synergistic action. A high dose of SeBZF3 (300 mg/kg) did not produce oral acute toxicity. The present results provide evidence for the antidepressant-like action of SeBZF3 and its relative safety, as well as predict the possible interactions with the serotonergic system, aiding in the development of novel options to alleviate psychiatric disabilities.
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Affiliation(s)
- Taís da Silva Teixeira Rech
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - Estela Hartwig Ribeiro
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - Ediandra Tissot Castro
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - Amália Gonçalves Alves
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - Dianer Nornberg Strelow
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - José Sebastião Santos Neto
- Programa de Pós-graduação em Química (PPGQ), Laboratório de Síntese de Derivados de Selênio e Telúrio (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, CEP 88040-900 Florianópolis, Santa Catarina, Brazil
| | - Antonio Luiz Braga
- Programa de Pós-graduação em Química (PPGQ), Laboratório de Síntese de Derivados de Selênio e Telúrio (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, CEP 88040-900 Florianópolis, Santa Catarina, Brazil
| | - César Augusto Brüning
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
| | - Cristiani Folharini Bortolatto
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
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Jorge J, Fanti Del Pino Santos K, Timóteo F, Rodrigo Piva Vasconcelos R, Ignacio Ayala Cáceres O, Juliane Arantes Granja I, Monteiro de Souza D, Elias Allievi Frizon T, Di Vaccari Botteselle G, Luiz Braga A, Saba S, Ur Rashid H, Rafique J. Recent Advances on the Antimicrobial Activities of Schiff Bases and their Metal Complexes: An Updated Overview. Curr Med Chem 2023; 30:CMC-EPUB-129774. [PMID: 36823995 DOI: 10.2174/0929867330666230224092830] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 12/12/2022] [Accepted: 12/29/2022] [Indexed: 02/25/2023]
Abstract
Schiff bases represent a valuable class of organic compounds, synthesized via condensation of primary amines with ketones or aldehydes. They are renowned for possessing innumerable applications in agricultural chemistry, organic synthesis, chemical and biological sensing, coating, polymer and resin industries, catalysis, coordination chemistry, and drug designing. Schiff bases contain imine or azomethine (-C=N-) functional groups which are important pharmacophores for the design and synthesis of lead bioactive compounds. In medicinal chemistry, Schiff bases have attracted immense attention due to their diverse biological activities. This review aims to encompass the recent developments on the antimicrobial activities of Schiff bases. The article summarizes the antibacterial, antifungal, antiviral, antimalarial, and antileishmanial activities of Schiff bases reported since 2011.
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Affiliation(s)
- Juliana Jorge
- Federal University of Mato Grosso do Sul Institute of Chemistry Campo Grande Brazil
| | | | - Fernanda Timóteo
- Federal University of Mato Grosso do Sul Institute of Chemistry Campo Grande Brazil
| | | | | | | | | | | | | | - Antonio Luiz Braga
- Universidade Federal de Santa Catarina Department of Chemistry Florianópolis Brazil
| | - Sumbal Saba
- Universidade Federal de Goiás Institute of Chemistry Goiânia Brazil
| | - Haroon Ur Rashid
- Universidade Federal de Santa Catarina Department of Chemistry Florianópolis Brazil
| | - Jamal Rafique
- Federal University of Mato Grosso do Sul Institute of Chemistry Campo Grande Brazil
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Santos WAB, Martins GM, Xavier FR, Braga AL, De Castro PP, Mendes SR. Electrosynthesis of Flavanones via oxa-Michael Addition Using Sacrificial Electrodes. SYNTHESIS-STUTTGART 2023. [DOI: 10.1055/a-2038-9146] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Herein, we report an electrochemical synthesis of Flavanones via oxa-Michael addition using silver electrode as a sacrifice. This electrosynthetic system showed good yields, broad substrate scope and good functional group tolerance. Additionally, the method proved to be applicable on a gram scale. Several studies were carried out to elucidate the reaction mechanism, such as control reactions, cyclic voltammetry and theoretical studies, allowing the proposal of a plausible pathway for this transformation.
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Affiliation(s)
| | | | | | | | - Pedro P De Castro
- Chemistry, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
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Doerner CV, Neto J, Cabreira C, Saba S, Sandjo LP, Rafique J, Braga AL, de Assis FF. Synthesis of 3-selanyl-isoflavones from 2-hydroxyphenyl enaminones using trichloroisocyanuric acid (TCCA): a sustainable approach. NEW J CHEM 2023. [DOI: 10.1039/d2nj06043d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
We hereby present an original and sustainable synthetic methodology for the synthesis of 3-selanyl-isoflavones from 2-hydroxyphenyl enaminones and diorganoyl diselenides. The reaction is promoted in a one-pot manner by the...
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Barbosa FAR, Rode MP, Santos Canto RF, Silva AH, Creczynski‐Pasa TB, Braga AL. Antiproliferative Effect and Autophagy Inhibition of Dihydropyrimidinone‐Cinnamic Acid Hybrids. ChemistrySelect 2022. [DOI: 10.1002/slct.202200274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Flavio Augusto Rocha Barbosa
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen) Departamento de Química Universidade Federal de Santa Catarina (UFSC) 88040-900 Florianópolis SC Brazi
| | - Michele Patrícia Rode
- Grupo de Estudos de Interações entre Micro e Macromoléculas (GEIMM) Departamento de Ciências Farmacêuticas Universidade Federal de Santa Catarina (UFSC) 88040-370 Florianópolis SC Brazil
| | - Rômulo Faria Santos Canto
- Laboratório de Química Medicinal de Compostos de Selênio (QMCSe) Departamento de Farmacociências Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA) 90050-170 Porto Alegre RS Brazil
| | - Adny Henrique Silva
- Grupo de Estudos de Interações entre Micro e Macromoléculas (GEIMM) Departamento de Ciências Farmacêuticas Universidade Federal de Santa Catarina (UFSC) 88040-370 Florianópolis SC Brazil
| | - Tânia Beatriz Creczynski‐Pasa
- Grupo de Estudos de Interações entre Micro e Macromoléculas (GEIMM) Departamento de Ciências Farmacêuticas Universidade Federal de Santa Catarina (UFSC) 88040-370 Florianópolis SC Brazil
| | - Antonio Luiz Braga
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen) Departamento de Química Universidade Federal de Santa Catarina (UFSC) 88040-900 Florianópolis SC Brazi
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da Silva Teixeira Rech T, Gonçalves Alves A, Nornberg Strelow D, Devantier Krüger L, Carraro Júnior LR, Dos Santos Neto JS, Braga AL, Brüning CA, Folharini Bortolatto C. 2-Phenyl-3-(phenylselanyl)benzofuran elicits acute antidepressant-like action in male Swiss mice mediated by modulation of the dopaminergic system and reveals therapeutic efficacy in both sexes. Psychopharmacology (Berl) 2021; 238:3013-3024. [PMID: 34312682 DOI: 10.1007/s00213-021-05921-9] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 07/05/2021] [Indexed: 10/20/2022]
Abstract
RATIONALE Depression is a psychiatric disorder that constitutes one of the leading causes of disability worldwide. 2-Phenyl-3-(phenylselanyl)benzofuran (SeBZF1) has been studied as a potential antidepressant drug, but its pharmacological action needs more investigation. OBJECTIVES AND METHODS Our aim was to extend information about the antidepressant-like action of SeBZF1 using the mouse tail suspension test (TST). Initial experiments investigated the mechanisms involved in the acute antidepressant-like action of SeBZF1 in male Swiss mice. For this purpose, males received noradrenergic or dopaminergic receptor antagonists before acute SeBZF1 administration (50 mg/kg, per oral). In parallel, effects of combined treatment with SeBZF1 and bupropion at sub-effective doses (1 and 3 mg/kg, respectively) were tested. The next experiments were designed to determine the acute effects of SeBZF1 in females through a dose-response curve (5-50 mg/kg). Lastly, the efficacy of a 7-day repeated treatment with SeBZF1 (1 and 5 mg/kg) in mice of both sexes and its safety were evaluated. TST and the open-field test (OFT) were employed in all behavioral experiments. RESULTS Pre-administration of dopaminergic antagonists (SCH23390, a selective D1R antagonist; sulpiride, a selective D2/D3R antagonist; and haloperidol, a non-selective antagonist), but not of adrenergic α1, α2, and β-R antagonists, blocked the acute antidepressant-like effects of SeBZF1 in males. Co-administration of sub-effective doses of SeBZF1 and bupropion reduced the depressive phenotype. In addition, acute treatment with SeBZF1 at 50 mg/kg produced a reduction of female immobility. Finally, repeated treatment with SeBZF1 (1 and 5 mg/kg) was effective in causing antidepressant-like effects in both sexes. Locomotor activity, plasma transaminases, and urea levels remained unaltered after SeBZF1 exposure. CONCLUSION Our findings provide evidence of the involvement of the dopaminergic system in the acutely antidepressant-like action of SeBZF1 in male mice and reveal the compound efficacy when acute or repeatedly administered in both sexes.
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Affiliation(s)
- Taís da Silva Teixeira Rech
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil
| | - Amália Gonçalves Alves
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil
| | - Dianer Nornberg Strelow
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil
| | - Letícia Devantier Krüger
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil
| | - Luiz Roberto Carraro Júnior
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil
| | - José Sebastião Dos Santos Neto
- Programa de Pós-Graduação em Química (PPGQ), Laboratório de Síntese de Derivados de Selênio E Telúrio (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, CEP 88040-900, Brasil
| | - Antonio Luiz Braga
- Programa de Pós-Graduação em Química (PPGQ), Laboratório de Síntese de Derivados de Selênio E Telúrio (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, CEP 88040-900, Brasil
| | - César Augusto Brüning
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil.
| | - Cristiani Folharini Bortolatto
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, CEP 96010-900, Brasil.
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Franco MS, Saba S, Rafique J, Braga AL. KIO
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‐mediated Selective Hydroxymethylation/Methylenation of Imidazo‐Heteroarenes: A Greener Approach. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Marcelo Straesser Franco
- Departamento de Química Universidade Federal de Santa Catarina—UFSC Florianópolis 88040-900 SC-Brazil
| | - Sumbal Saba
- Instituto de Química Universidade Federal de Goiás—UFG Goiânia 74690-900 GO-Brazil
| | - Jamal Rafique
- Instituto de Química, Universidade Federal do Mato Grosso do Sul—UFMS Campo Grande 79074-460 MS-Brazil
| | - Antonio Luiz Braga
- Departamento de Química Universidade Federal de Santa Catarina—UFSC Florianópolis 88040-900 SC-Brazil
- Department of Chemical Sciences Faculty of Science University of Johannesburg Doornfontein 2028 South Africa
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10
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Franco MS, Saba S, Rafique J, Braga AL. KIO 4 -mediated Selective Hydroxymethylation/Methylenation of Imidazo-Heteroarenes: A Greener Approach. Angew Chem Int Ed Engl 2021; 60:18454-18460. [PMID: 34097781 DOI: 10.1002/anie.202104503] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [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: 03/31/2021] [Revised: 05/14/2021] [Indexed: 02/06/2023]
Abstract
Herein, we report a KIO4 -mediated, sustainable and chemoselective approach for the one-pot C(sp2 )-H bond hydroxymethylation or methylenation of imidazo-heteroarenes with formaldehyde, generated in situ via the oxidative cleavage of ethylene glycol or glycerol (renewable reagents) through the Malaprade reaction. In the presence of ethylene glycol, a series of 3-hydroxymethyl-imidazo-heteroarenes was obtained in good to excellent yields. These compounds are important intermediates to access pharmaceutical drugs, e.g., Zolpidem. Furthermore, by using glycerol, bis(imidazo[1,2-a]pyridin-3-yl)methane derivatives were selectively obtained in good to excellent yields.
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Affiliation(s)
- Marcelo Straesser Franco
- Departamento de Química, Universidade Federal de Santa Catarina-UFSC, Florianópolis, 88040-900, SC-Brazil
| | - Sumbal Saba
- Instituto de Química, Universidade Federal de Goiás-UFG, Goiânia, 74690-900, GO-Brazil
| | - Jamal Rafique
- Instituto de Química, Universidade, Federal do Mato Grosso do Sul-UFMS, Campo Grande, 79074-460, MS-Brazil
| | - Antonio Luiz Braga
- Departamento de Química, Universidade Federal de Santa Catarina-UFSC, Florianópolis, 88040-900, SC-Brazil.,Department of Chemical Sciences, Faculty of Science, University of Johannesburg, Doornfontein, 2028, South Africa
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11
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Nascimento V, Cordeiro PS, Arca M, Marini F, Sancineto L, Braga AL, Lippolis V, Iwaoka M, Santi C. Fast and easy conversion of ortho amidoaryldiselenides into the corresponding ebselen-like derivatives driven by theoretical investigations. NEW J CHEM 2020. [DOI: 10.1039/d0nj01605e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The in silico predicted Se⋯N interaction on amidoarylselenenyl iodides has been experimentally exploited for the efficient synthesis of N-substituted benzoisoselenazol-3(2H)-ones, benzoisothiazol-3(2H)-ones and ebselen, recently reported as potent antiviral agent against Sars-Cov2.
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Affiliation(s)
- Vanessa Nascimento
- Departamento de Química Orgânica
- Universidade Federal Fluminense
- Laboratório de Síntese e Aplicação de Substâncias Supramoleculares e Organocalcogênios (SupraSelen)
- Outeiro São João Batista s/n
- Niterói
| | - Pâmella Silva Cordeiro
- Departamento de Química Orgânica
- Universidade Federal Fluminense
- Laboratório de Síntese e Aplicação de Substâncias Supramoleculares e Organocalcogênios (SupraSelen)
- Outeiro São João Batista s/n
- Niterói
| | - Massimiliano Arca
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- Monserrato
- Italy
| | - Francesca Marini
- Department of Pharmaceutical Sciences
- University of Perugia
- Group of Catalysis, Synthesis and Organic Green Chemistry
- Perugia
- Italy
| | - Luca Sancineto
- Department of Pharmaceutical Sciences
- University of Perugia
- Group of Catalysis, Synthesis and Organic Green Chemistry
- Perugia
- Italy
| | - Antonio Luiz Braga
- LabSelen
- Departamento de Química
- Universidade Federal de Santa Catarina
- Florianópolis
- Brazil
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- Monserrato
- Italy
| | - Michio Iwaoka
- Department of Chemistry
- School of Science
- Tokai University
- Kanagawa 259-1292
- Japan
| | - Claudio Santi
- Department of Pharmaceutical Sciences
- University of Perugia
- Group of Catalysis, Synthesis and Organic Green Chemistry
- Perugia
- Italy
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12
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Durigon DC, Maragno Peterle M, Bortoluzzi AJ, Ribeiro RR, Braga AL, Peralta RA, Neves A. Cu(ii) complexes with tridentate sulfur and selenium ligands: catecholase and hydrolysis activity. NEW J CHEM 2020. [DOI: 10.1039/d0nj02806a] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two new copper(ii) mononuclear complexes (CSe and CS) were synthesized and characterized by the following techniques: X-ray crystallography, elemental analysis, IR, EPR and UV-vis spectroscopies, conductimetric analysis and mass spectrometry.
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Affiliation(s)
| | | | | | | | - Antonio Luiz Braga
- Departamento de Química
- Universidade Federal de Santa Catarina
- Florianópolis
- Brazil
| | | | - Ademir Neves
- Departamento de Química
- Universidade Federal de Santa Catarina
- Florianópolis
- Brazil
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13
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Hassan W, Narayanaperumal S, Gul K, Braga AL, Rodrigues OD, da Rocha JBT. Substituent, structural and positional isomerisation alter anti-oxidant activity of organochalcogen compounds in rats’ brain preparations. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2014.10.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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14
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Sudati JH, Nogara PA, Saraiva RA, Wagner C, Alberto EE, Braga AL, Fachinetto R, Piquini PC, Rocha JBT. Diselenoamino acid derivatives as GPx mimics and as substrates of TrxR: in vitro and in silico studies. Org Biomol Chem 2019; 16:3777-3787. [PMID: 29737350 DOI: 10.1039/c8ob00451j] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Excessive production of reactive species in living cells usually has pathological effects. Consequently, the synthesis of compounds which can mimic the activity of antioxidant enzymes has inspired great interest. In this study, a variety of diselenoamino acid derivatives from phenylalanine and valine were tested to determine whether they could be functional mimics of glutathione peroxidase (GPx) and substrates for liver thioredoxin reductase (TrxR). Diselenides C and D showed the best GPx mimicking properties when compared with A and B. We suppose that the catalytic activity of diselenide GPx mimics depends on the steric effects, which can be influenced by the number of carbon atoms between the selenium atom and the amino acid residue and/or by the amino acid lateral residue. Compounds C and D stimulated NADPH oxidation in the presence of partially purified hepatic mammalian TrxR, indicating that they are substrates for TrxR. Our study indicates a possible dissociation between the two pathways for peroxide degradation (i.e., via a substrate for TrxR or via mimicry of GPx) for compounds tested in this study, except for PhSeSePh, and the antioxidant activity of diselenoamino acids can also be attributed to their capacity to mimic GPx and to be a substrate for mammalian TrxR.
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15
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Almeida GM, Rafique J, Saba S, Siminski T, Mota NSRS, Filho DW, Braga AL, Pedrosa RC, Ourique F. Novel selenylated imidazo[1,2-a]pyridines for breast cancer chemotherapy: Inhibition of cell proliferation by Akt-mediated regulation, DNA cleavage and apoptosis. Biochem Biophys Res Commun 2018; 503:1291-1297. [PMID: 30017191 DOI: 10.1016/j.bbrc.2018.07.039] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [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: 07/04/2018] [Accepted: 07/07/2018] [Indexed: 12/29/2022]
Abstract
A novel series of selenylated imidazo[1,2-a]pyridines were designed and synthesized with a view to a promising activity against breast cancer cell. The compounds, 7-methyl-3-(naphthalene-1-ylselanyl)-2-phenylimidazo[1,2-a]pyridine, named IP-Se-05, and 3-((2-methoxyphenyl)selanyl)-7-methyl-2-phenylimidazo[1,2-a]pyridine, named IP-Se-06, showed high cytotoxicity for MCF-7 cells (IC50 = 26.0 μM and 12.5 μM, respectively). Both the compounds inhibited the cell proliferation and caused decrease in the number of cells in the G2/M phase of cell cycle. IP-Se-05 and IP-Se-06 were also evaluated for effects on CT-DNA and DNA of MCF-7 cells. The compounds intercalated into CT-DNA and both treatments caused cleavage of DNA in cells. In addition, the compounds induced cell death by apoptosis. However, the presence of (2-methoxyphenyl) selenyl moiety at the imidazo[1,2-a]pyridine (IP-Se-06) appears to have a better antitumor effect with higher cytotoxicity at a lower concentration and caused less necrosis. Overall, the current study established IP-Se-06 more than IP-Se-05 as a potential prototype compound to be employed as an antiproliferative agent for the treatment of breast cancer.
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Affiliation(s)
- Gabriela M Almeida
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Jamal Rafique
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, SC, Brazil
| | - Sumbal Saba
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, SC, Brazil
| | - Tâmila Siminski
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Nádia S R S Mota
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Danilo Wilhelm Filho
- Ecology and Zoology Department, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Antonio Luiz Braga
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, SC, Brazil
| | - Rozangela Curi Pedrosa
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Fabiana Ourique
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil.
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16
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Barbosa FAR, Siminski T, Canto RFS, Almeida GM, Mota NSRS, Ourique F, Pedrosa RC, Braga AL. Novel pyrimidinic selenourea induces DNA damage, cell cycle arrest, and apoptosis in human breast carcinoma. Eur J Med Chem 2018; 155:503-515. [PMID: 29908443 DOI: 10.1016/j.ejmech.2018.06.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [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: 12/12/2017] [Revised: 06/07/2018] [Accepted: 06/09/2018] [Indexed: 11/30/2022]
Abstract
Novel pyrimidinic selenoureas were synthesized and evaluated against tumour and normal cell lines. Among these, the compound named 3j initially showed relevant cytotoxicity and selectivity for tumour cells. Three analogues of 3j were designed and synthesized keeping in view the structural requirements of this compound. Almost all the tested compounds displayed considerable cytotoxicity. However, 8a, one of the 3j analogues, was shown to be highly selective and cytotoxic, especially for breast carcinoma cells (MCF-7) (IC50 = 3.9 μM). Furthermore, 8a caused DNA damage, inhibited cell proliferation, was able to arrest cell cycle in S phase, and induced cell death by apoptosis in human breast carcinoma cells. Moreover, predictions of pharmacokinetic properties showed that 8a may present good absorption and permeation characteristics for oral administration. Overall, the current study established 8a as a potential drug prototype to be employed as a DNA interactive cytotoxic agent for the treatment of breast cancer.
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Affiliation(s)
- Flavio A R Barbosa
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Tâmila Siminski
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Rômulo F S Canto
- Laboratório de Química Medicinal de Compostos de Selênio (QMCSe), Programa de pós-graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil
| | - Gabriela M Almeida
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Nádia S R S Mota
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Fabiana Ourique
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Rozangela Curi Pedrosa
- Laboratório de Bioquímica Experimental (LABIOEX), Departamento de Bioquímica, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil.
| | - Antonio Luiz Braga
- Laboratório de Síntese de Substâncias de Selênio Bioativas (LabSelen), Departamento de Química, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil.
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17
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Sancineto L, Piccioni M, De Marco S, Pagiotti R, Nascimento V, Braga AL, Santi C, Pietrella D. Diphenyl diselenide derivatives inhibit microbial biofilm formation involved in wound infection. BMC Microbiol 2016; 16:220. [PMID: 27654924 PMCID: PMC5031294 DOI: 10.1186/s12866-016-0837-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [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: 05/24/2016] [Accepted: 09/13/2016] [Indexed: 12/13/2022] Open
Abstract
Background Organoselenium compounds have antimicrobial activity against some bacteria and fungi; furthermore, the antioxidant activity of diselenides has been demonstrated. The aim of the present work was to examine the in vitro minimal inhibitory concentration of a panel of differently substituted diselenides and their effectiveness in inhibiting biofilm formation and dispersing preformed microbial biofilm of Staphylococcus epidermidis, Staphylococcus aureus, Streptococcus pyogenes and Pseudomonas aeruginosa and the yeast Candida albicans, all involved in wound infections. Moreover, the cytotoxicity of the compounds was determined in human dermal fibroblast and keratinocytes. In closing, we tested their direct antioxidant activity. Results Diselenides showed different antimicrobial activity, depending on the microorganism. All diselenides demonstrated a good antibiofilm activity against S. aureus and S. epidermidis, the compounds camphor diselenide, bis[ethyl-N-(2’-selenobenzoyl) glycinate] and bis[2’-seleno-N-(1-methyl-2-phenylethyl) benzamide] were active against S. pyogenes and C. albicans biofilm while only diselenides 2,2’-diselenidyldibenzoic acid and bis[ethyl-N-(2’-selenobenzoyl) glycinate] were effective against P. aeruginosa. Moreover, the compounds bis[ethyl-N-(2’-selenobenzoyl) glycinate] and bis[2’-seleno-N-(1-methyl-2-phenylethyl) benzamide] showed an antioxidant activity at concentrations lower than the 50 % of cytotoxic concentration. Conclusions Because microbial biofilms are implicated in chronic infection of wounds and treatment failure, the combination of antimicrobial activity and potential radical scavenging effects may contribute to the improvement of wound healing. Therefore, this study suggests that bis[ethylN-(2’-selenobenzoyl) glycinate] and bis[2’-seleno-N-(1-methyl-2-phenylethyl) benzamide] are promising compounds to be used in preventing and treating microbial wound infections.
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Affiliation(s)
- Luca Sancineto
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy
| | - Miranda Piccioni
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy
| | - Stefania De Marco
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy
| | - Rita Pagiotti
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy
| | - Vanessa Nascimento
- Laboratorio de Sıntese de Substancias de Selenio Bioativas, Centro de Ciencias Fısicas e Matematicas, Departamento de Quımica, Universidade Federal de Santa Catarina, 88040-900, Florianopolis, SC, Brazil
| | - Antonio Luiz Braga
- Laboratorio de Sıntese de Substancias de Selenio Bioativas, Centro de Ciencias Fısicas e Matematicas, Departamento de Quımica, Universidade Federal de Santa Catarina, 88040-900, Florianopolis, SC, Brazil
| | - Claudio Santi
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy
| | - Donatella Pietrella
- Department of Pharmaceutical Sciences, University of Perugia, Via del Giochetto, 06122, Perugia, Italy.
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Ribeiro RP, Santos DB, Colle D, Naime AA, Gonçalves CL, Ghizoni H, Hort MA, Godoi M, Dias PF, Braga AL, Farina M. Decreased forelimb ability in mice intracerebroventricularly injected with low dose 6-hydroxidopamine: A model on the dissociation of bradykinesia from hypokinesia. Behav Brain Res 2016; 305:30-6. [PMID: 26921691 DOI: 10.1016/j.bbr.2016.02.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 02/18/2016] [Accepted: 02/21/2016] [Indexed: 12/20/2022]
Abstract
Bradykinesia and hypokinesia represent well-known motor symptoms of Parkinson's disease (PD). While bradykinesia (slow execution of movements) is present in less affected PD patients and aggravates as the disease severity increases, hypokinesia (reduction of movement) seems to emerge prominently only in the more affected patients. Here we developed a model based on the central infusion of low dose (40μg) 6-hydroxydopamine (6-OHDA) in mice in an attempt to discriminate bradykinesia (accessed through forelimb inability) from hypokinesia (accessed through locomotor and exploratory activities). The potential beneficial effects of succinobucol against 6-OHDA-induced forelimb inability were also evaluated. One week after the beginning of treatment with succinobucol (i.p. injections, 10mg/kg/day), mice received a single i.c.v. infusion of 6-OHDA (40μg/site). One week after 6-OHDA infusion, general locomotor/exploratory activities (open field test), muscle strength (grid test), forelimb skill (single pellet task), as well as striatal biochemical parameters related to oxidative stress and cellular homeostasis (glutathione peroxidase, glutathione reductase and NADH dehydrogenases activities, lipid peroxidation and TH levels), were evaluated. 6-OHDA infusions did not change locomotor/exploratory activities and muscle strength, as well as the evaluated striatal biochemical parameters. However, 6-OHDA infusions caused significant reductions (50%) in the single pellet reaching task performance, which detects forelimb skill inability and can be used to experimentally identify bradykinesia. Succinobucol partially protected against 6-OHDA-induced forelimb inability. The decreased forelimb ability with no changes in locomotor/exploratory behavior indicates that our 6-OHDA-based protocol represents a useful tool to mechanistically study the dissociation of bradykinesia and hypokinesia in PD.
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Affiliation(s)
- Renata Pietsch Ribeiro
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil; Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil; Departamento Acadêmico de Saúde e Serviço, Instituto Federal de Santa Catarina, 88020030 Florianópolis, Santa Catarina, Brazil
| | - Danúbia Bonfanti Santos
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil
| | - Dirleise Colle
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil
| | - Aline Aita Naime
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil
| | - Cinara Ludvig Gonçalves
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil
| | - Heloisa Ghizoni
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil
| | - Mariana Appel Hort
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
| | - Marcelo Godoi
- Escola de Química e Alimentos, Universidade Federal de Rio Grande, Campus Santo Antônio da Patrulha, Rio Grande do Sul, Brazil
| | - Paulo Fernando Dias
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Antonio Luiz Braga
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Marcelo Farina
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil; Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040900 Florianópolis, Santa Catarina, Brazil.
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19
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Rafique J, Saba S, Canto RFS, Frizon TEA, Hassan W, Waczuk EP, Jan M, Back DF, Da Rocha JBT, Braga AL. Synthesis and biological evaluation of 2-picolylamide-based diselenides with non-bonded interactions. Molecules 2015; 20:10095-109. [PMID: 26039333 PMCID: PMC6272563 DOI: 10.3390/molecules200610095] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 05/23/2015] [Accepted: 05/27/2015] [Indexed: 12/28/2022] Open
Abstract
In this paper, we report the synthesis and biological evaluation of picolylamide-based diselenides with the aim of developing a new series of diselenides with O···Se non-bonded interactions. The synthesis of diselenides was performed by a simple and efficient synthetic route. All the products were obtained in good yields and their structures were determined by 1H-NMR, 13C-NMR and HRMS. All these new compounds showed promising activities when tested in different antioxidant assays. These amides exhibited strong thiol peroxidase-like (TPx) activity. In fact one of the compounds showed 4.66 times higher potential than the classical standard i.e., diphenyl diselenide. The same compound significantly inhibited iron (Fe)-induced thiobarbituric acid reactive species (TBARS) production in rat's brain homogenate. In addition, the X-ray structure of the most active compound showed non-bonded interaction between the selenium and the oxygen atom that are in close proximity and may be responsible for the increased antioxidant activity. The present study provides evidence about the possible biochemical influence of nonbonding interactions on organochalcogens potency.
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Affiliation(s)
- Jamal Rafique
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianopolis 88040-900, SC, Brazil.
| | - Sumbal Saba
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianopolis 88040-900, SC, Brazil.
| | - Rômulo Faria Santos Canto
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianopolis 88040-900, SC, Brazil.
| | - Tiago Elias Allievi Frizon
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianopolis 88040-900, SC, Brazil.
| | - Waseem Hassan
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, UFSM, Santa Maria 97105-900, RS, Brazil.
- Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, KPK, Pakistan.
| | - Emily Pansera Waczuk
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, UFSM, Santa Maria 97105-900, RS, Brazil.
| | - Maryam Jan
- Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, KPK, Pakistan.
| | - Davi Fernando Back
- Departamento de Química, Laboratório de Materiais Inorgânicos, Universidade Federal de Santa Maria, UFSM, Santa Maria 97115-900, RS, Brazil.
| | - João Batista Teixeira Da Rocha
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, UFSM, Santa Maria 97105-900, RS, Brazil.
| | - Antonio Luiz Braga
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianopolis 88040-900, SC, Brazil.
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Ciancaleoni G, Santi C, Ragni M, Braga AL. Charge-displacement analysis as a tool to study chalcogen bonded adducts and predict their association constants in solution. Dalton Trans 2015; 44:20168-75. [DOI: 10.1039/c5dt03388h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The secondary interaction between an atom of tellurium and different Lewis bases has been studied by charge displacement analysis, providing a detailed description of the interaction and a computational insight into experimental data.
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Affiliation(s)
- Gianluca Ciancaleoni
- Departamento de Química
- Universidade Federal de Santa Catarina
- 88040-900 Florianópolis
- Brazil
| | - Claudio Santi
- Dipartimento di Scienze Farmaceutiche
- Università di Perugia
- Perugia
- Italy
| | - Mirco Ragni
- Departamento de Física
- Universidade Estadual de Feira de Santana
- 44036-900 Feira de Santana
- Brazil
| | - Antonio Luiz Braga
- Departamento de Química
- Universidade Federal de Santa Catarina
- 88040-900 Florianópolis
- Brazil
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Canto RFS, Barbosa FAR, Nascimento V, de Oliveira AS, Brighente IMC, Braga AL. Design, synthesis and evaluation of seleno-dihydropyrimidinones as potential multi-targeted therapeutics for Alzheimer's disease. Org Biomol Chem 2014; 12:3470-7. [DOI: 10.1039/c4ob00598h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the design, synthesis and evaluation of a series of seleno-dihydropyrimidinones as potential multi-targeted therapeutics for Alzheimer's disease.
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Affiliation(s)
- Rômulo F. S. Canto
- Laboratorio de Sintese de Substancias de Selenio Bioativas
- Centro de Ciencias Fisicas e Matematicas
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
| | - Flavio A. R. Barbosa
- Laboratorio de Sintese de Substancias de Selenio Bioativas
- Centro de Ciencias Fisicas e Matematicas
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
| | - Vanessa Nascimento
- Laboratorio de Sintese de Substancias de Selenio Bioativas
- Centro de Ciencias Fisicas e Matematicas
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
| | - Aldo S. de Oliveira
- CFM
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
| | - Inês M. C. Brighente
- CFM
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
| | - Antonio Luiz Braga
- Laboratorio de Sintese de Substancias de Selenio Bioativas
- Centro de Ciencias Fisicas e Matematicas
- Departamento de Quimica
- Universidade Federal de Santa Catarina
- Florianopolis, Brazil
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Braga AL, Lüdtke DS, Schneider PH, Andrade LH, Paixão MW. Catálise assimétrica no Brasil: desenvolvimento e potencialidades para o avanço da indústria química brasileira. QUIM NOVA 2013. [DOI: 10.1590/s0100-40422013001000017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Godoi M, Ricardo EW, Frizon TE, Rocha MS, Singh D, Paixão MW, Braga AL. An efficient synthesis of alkynyl selenides and tellurides from terminal acetylenes and diorganyl diselenides or ditellurides catalyzed by recyclable copper oxide nanopowder. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.08.086] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Filho CB, Del Fabbro L, Boeira SP, Furian AF, Savegnago L, Soares LC, Braga AL, Jesse CR. Hepatoprotective effect ofbis(4-methylbenzoyl) diselenide against CCl4-induced oxidative damage in mice. Cell Biochem Funct 2012; 31:152-8. [DOI: 10.1002/cbf.2869] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 08/07/2012] [Accepted: 08/08/2012] [Indexed: 12/12/2022]
Affiliation(s)
- Carlos Borges Filho
- Laboratório de Avaliações Farmacológicas e Toxicológicas Aplicadas às Moléculas Bioativas, LaftamBio Pampa; Universidade Federal do Pampa; CEP 97650-000; Itaqui; RS; Brazil
| | - Lucian Del Fabbro
- Laboratório de Avaliações Farmacológicas e Toxicológicas Aplicadas às Moléculas Bioativas, LaftamBio Pampa; Universidade Federal do Pampa; CEP 97650-000; Itaqui; RS; Brazil
| | - Silvana P. Boeira
- Laboratório de Avaliações Farmacológicas e Toxicológicas Aplicadas às Moléculas Bioativas, LaftamBio Pampa; Universidade Federal do Pampa; CEP 97650-000; Itaqui; RS; Brazil
| | - Ana Flávia Furian
- Laboratório de Avaliações Farmacológicas e Toxicológicas Aplicadas às Moléculas Bioativas, LaftamBio Pampa; Universidade Federal do Pampa; CEP 97650-000; Itaqui; RS; Brazil
| | - Lucielli Savegnago
- Centro de Desenvolvimento Tecnológico, Unidade Biotecnologia; Universidade Federal de Pelotas; Pelotas; RS; Brazil
| | - Letiére Cabreira Soares
- Departamento de Química, Centro de Ciências Naturais e Exatas; Universidade Federal de Santa Maria; Santa Maria; CEP 97105-900; RS; Brazil
| | - Antonio Luiz Braga
- Departamento de Química, Centro de Ciências Naturais e Exatas; Universidade Federal de Santa Maria; Santa Maria; CEP 97105-900; RS; Brazil
| | - Cristiano R. Jesse
- Laboratório de Avaliações Farmacológicas e Toxicológicas Aplicadas às Moléculas Bioativas, LaftamBio Pampa; Universidade Federal do Pampa; CEP 97650-000; Itaqui; RS; Brazil
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Gul K, Narayanaperumal S, Dornelles L, Rodrigues OE, Braga AL. Bimetallic system for the synthesis of diorganyl selenides and sulfides, chiral β-seleno amines, and seleno- and thioesters. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.05.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Narayanaperumal S, Alberto EE, Gul K, Kawasoko CY, Dornelles L, Rodrigues OE, Braga AL. Zn in ionic liquid: an efficient reaction media for the synthesis of diorganyl chalcogenides and chalcogenoesters. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Singh D, Galetto FZ, Soares LC, Rodrigues OED, Braga AL. Metal-Free Air Oxidation of Thiols in Recyclable Ionic Liquid: A Simple and Efficient Method for the Synthesis of Disulfides. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000126] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Machado MDS, Villela IV, Moura DJ, Rosa RM, Salvador M, Lopes NP, Braga AL, Roesler R, Saffi J, Henriques JAP. 3′3-Ditrifluoromethyldiphenyl diselenide: A new organoselenium compound with interesting antigenotoxic and antimutagenic activities. Mutation Research/Genetic Toxicology and Environmental Mutagenesis 2009; 673:133-40. [DOI: 10.1016/j.mrgentox.2009.01.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2008] [Revised: 01/15/2009] [Accepted: 01/20/2009] [Indexed: 11/28/2022]
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Braga AL, Milani P, Vargas F, Paixão MW, Sehnem JA. Modular chiral thiazolidine catalysts in asymmetric aryl transfer reactions. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.10.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Deheinzelin D, Braga AL, Martins LC, Martins MA, Hernandez A, Yoshida WB, Maffei F, Monachini M, Calderaro D, Campos W, Sguizzatto GT, Caramelli B. Incorrect use of thromboprophylaxis for venous thromboembolism in medical and surgical patients: results of a multicentric, observational and cross-sectional study in Brazil. J Thromb Haemost 2006; 4:1266-70. [PMID: 16706970 DOI: 10.1111/j.1538-7836.2006.01981.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Although effective strategies for the prevention of venous thromboembolism (VTE) are widely available, a significant number of patients still develop VTE because appropriate thromboprophylaxis is not correctly prescribed. We conducted this study to estimate the risk profile for VTE and the employment of adequate thromboprophylaxis procedures in patients admitted to hospitals in the state of São Paulo, Brazil. METHODS Four hospitals were included in this study. Data on risk factors for VTE and prescription of pharmacological and non-pharmacological thromboprophylaxis were collected from 1454 randomly chosen patients (589 surgical and 865 clinical). Case report forms were filled according to medical and nursing records. Physicians were unaware of the survey. Three risk assessment models were used: American College of Chest Physicians (ACCP) Guidelines, Caprini score, and the International Union of Angiololy Consensus Statement (IUAS). The ACCP score classifies VTE risk in surgical patients and the others classify VTE risk in surgical and clinical patients. Contingency tables were built presenting the joined distribution of the risk score and the prescription of any pharmacological and non-pharmacological thromboprophylaxis (yes or no). RESULTS According to the Caprini score, 29% of the patients with the highest risk for VTE were not prescribed any thromboprophylaxis. Considering the patients under moderate, high or highest risk who should be receiving prophylaxis, 37% and 29% were not prescribed thromboprophylaxis according to ACCP (surgical patients) and IUAS risk scores, respectively. In contrast, 27% and 42% of the patients at low risk of VTE, according to Caprini and IUAS scores, respectively, had thromboprophylaxis prescribed. CONCLUSION Despite the existence of several guidelines, this study demonstrates that adequate thromboprophylaxis is not correctly prescribed: high-risk patients are under-treated and low-risk patients are over-treated. This condition must be changed to insure that patients receive adequate treatment for the prevention of thromboembolism.
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Perottoni J, Rodrigues OED, Paixão MW, Zeni G, Lobato LP, Braga AL, Rocha JBT, Emanuelli T. Renal and hepatic ALA-D activity and selected oxidative stress parameters of rats exposed to inorganic mercury and organoselenium compounds. Food Chem Toxicol 2004; 42:17-28. [PMID: 14630126 DOI: 10.1016/j.fct.2003.08.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This paper evaluates the ability of organoselenium compounds [ebselen, selenocystine N-ethyl-carbamate (SeCis), bis-4-isopropyl-2-oxazolinyl phenyl diselenide (AASe)] to prevent HgCl(2) toxicity. Rats were injected with HgCl(2) (0 or 17 micromol/kg, sc) 6 h after organoselenium compounds had been injected (0 or 50 micromol/kg, sc). In vivo, HgCl(2) inhibited renal ALA-D activity ( approximately 48%), increased TBARS level in kidney ( approximately 52%) and reduced the hepatic content of non-protein thiol groups ( approximately 40%), but organoselenium compounds did not prevent such effects. SeCis, per se, increased renal TBARS level ( approximately 42%), while AASe increased hepatic content of ascorbic acid ( approximately 38%). In vitro, renal and hepatic ALA-D activity was inhibited by HgCl(2) (>or=25 microM), ebselen (>or=12 microM) and SeCis (>or=4 microM). HgCl(2) (400 microM) significantly increased TBARS production in renal and hepatic tissue preparations in vitro, and this effect was completely or partially prevented by organoselenium compounds. Ebselen exhibited thiol peroxidase activity in our assay conditions, while SeCis exhibited thiol-oxidizing properties regardless of the presence of peroxide. AASe had no effect on thiol oxidation. Results suggest that organoselenium compounds could not prevent mercury toxicity in vivo. The protective effect of these compounds against mercury-induced increase of TBARS production in vitro is probably related to an antioxidant action rather than to mercury binding.
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Affiliation(s)
- J Perottoni
- Departamento de Química, Centro Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
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Royes LFF, Fighera MR, Furian AF, Oliveira MS, da Silva LGM, Malfatti CRM, Schneider PH, Braga AL, Wajner M, Mello CF. Creatine protects against the convulsive behavior and lactate production elicited by the intrastriatal injection of methylmalonate. Neuroscience 2003; 118:1079-90. [PMID: 12732252 DOI: 10.1016/s0306-4522(02)00978-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Methylmalonic acidemias are metabolic disorders caused by a severe deficiency of methylmalonyl-CoA mutase activity, which are characterized by neurological dysfunction, including convulsions. It has been reported that the accumulating metabolite, L-methylmalonic acid (MMA), inhibits succinate dehydrogenase leading to ATP depletion in vitro, and that the intrastriatal injection of MMA induces convulsions through secondary NMDA receptor stimulation. In this study we investigated the effect of creatine (1.2, 3.6 and 12.0 mg/kg, (i.p.), [DOSAGE ERROR CORRECTED] succinate (1.5 micromol/striatum) and MK-801 (3 nmol/striatum) on the convulsions and on the striatal lactate increase induced by MMA (4.5 micromol/striatum) in rats. The effect of creatine on the striatal phosphocreatine content and on MMA-induced phosphocreatine depletion was also evaluated. Creatine, succinate and MK-801 pretreatment decreased the number and duration of convulsive episodes and the lactate increase elicited by MMA. Creatine, but not succinate, prevented the convulsions and the lactate increase induced by the direct stimulation of NMDA receptors. Acute creatine administration increased the total striatal phosphocreatine content and prevented MMA-induced phosphocreatine depletion. Our results suggest that MMA increases lactate production through secondary NMDA receptor activation, and it is proposed that the anticonvulsant effect of creatine against MMA-induced convulsions may be due to an increase in the phosphocreatine content available for metabolic purposes.
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Affiliation(s)
- L F F Royes
- Department of Chemistry, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil
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Zeni G, Barros OSDR, Moro AV, Braga AL, Peppe C. Hydrotelluration of aminoalkynes. Chem Commun (Camb) 2003:1258-9. [PMID: 12809219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Metal tellurolates (M = B3+; BuTeTeBu/NaBH4/EtOH; Li3+, Te0/BuLi/THF; In3+, BuTeTeBu/InI/EtOH) react with aminoalkynes to produce vinylic tellurides containing amino groups; the regio-, and stereo-chemistry of the hydrotelluration reaction depend on the metallic counter ion and on the nature of the amino group substituent.
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Affiliation(s)
- Gilson Zeni
- Departamento de Química, Laboratório de Bioquímica Toxicológica, UFSM-97105-900, Santa Maria, RS, Brazil.
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Zeni G, Soares do Rego Barros O, Venturini Moro A, Braga AL, Peppe C. Hydrotelluration of aminoalkynesElectronic supplementary information (ESI) available: spectroscopic data and detailed experimental procedures for all new compounds. See http://www.rsc.org/suppdata/cc/b3/b301857a/. Chem Commun (Camb) 2003. [DOI: 10.1039/b301857a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Farina M, Barbosa NBV, Nogueira CW, Folmer V, Zeni G, Andrade LH, Braga AL, Rocha JBT. Reaction of diphenyl diselenide with hydrogen peroxide and inhibition of delta-aminolevulinate dehydratase from rat liver and cucumber leaves. Braz J Med Biol Res 2002; 35:623-31. [PMID: 12045826 DOI: 10.1590/s0100-879x2002000600001] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The interaction of the product of H2O2 and (PhSe)2 with delta-aminolevulinate dehydratase (delta-ALA-D) from mammals and plants was investigated. (PhSe)2 inhibited rat hepatic delta-ALA-D with an IC50 of 10 microM but not the enzyme from cucumber leaves. The reaction of (PhSe)2 with H2O2 for 1 h increased the inhibitory potency of the original compound and the IC50 for animal delta-ALA-D inhibition was decreased from 10 to 2 microM. Delta-ALA-D from cucumber leaves was also inhibited by the products of reaction of (PhSe)2 with H2O2 with an IC50 of 4 microM. The major product of reaction of (PhSe)2 with H2O2 was identified as seleninic acid and produced an intermediate with a (lambda)max at 265 nm after reaction with t-BuSH. These results suggest that the interaction of (PhSe)2 with mammal delta-ALA-D requires the presence of cysteinyl residues in close proximity. Two cysteine residues in spatial proximity have been recently described for the mammalian enzyme. Analysis of the primary structure of plant delta-ALA-D did not reveal an analogous site. In contrast to (PhSe)2, seleninic acid, as a result of the higher electrophilic nature of its selenium atom, may react with additional cysteinyl residue(s) in mammalian delta-ALA-D and also with cysteinyl residues from cucumber leaves located at a site distinct from that found at the B and A sites in mammals. Although the interaction of organochalcogens with H2O2 may have some antioxidant properties, the formation of seleninic acid as a product of this reaction may increase the toxicity of organic chalcogens such as (PhSe)2.
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Affiliation(s)
- M Farina
- Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
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Rossato JI, Ketzer LA, Centurião FB, Silva SJN, Lüdtke DS, Zeni G, Braga AL, Rubin MA, Rocha JBT. Antioxidant properties of new chalcogenides against lipid peroxidation in rat brain. Neurochem Res 2002; 27:297-303. [PMID: 11958531 DOI: 10.1023/a:1014907228580] [Citation(s) in RCA: 153] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ebselen (2-phenyl- 1,2-benzisoselenazole-3 (2H)-one) is a seleno-organic compound with antioxidant properties, and anti-inflammatory actions. Recently, ebselen improved the outcome of acute ischemic stroke in humans. In the present study, the potential antioxidant capacity of organochalcogenide compounds diphenyl diselenide (PhSe)2, diphenyl ditelluride (PhTe)2, diphenyl disulfide (PhS)2, p-Cl-diphenyl diselenide (pCl-PhSe)2, bis-[S-4-isopropyl 2-phenyl oxazoline] diselenide (AA-Se)2, bis-[S-4-isopropyl 2-phenyl oxazoline] ditelluride (AA-Te)2 and bis-[S-4-isopropyl 2-phenyl oxazoline] disulfide (AA-S)2 was compared with that of ebselen (a classical antioxidant). Spontaneous and quinolinic acid (QA)- (2 mM) and sodium nitroprusside (SNP)- (5 microM)-induced thiobarbituric reactive species (TBARS) production by rat brain homogenates was determined colorimetrically. TBARS formation was reduced by ebselen, (PhSe)2, (PhTe)2, (AA-Se)2, (AA-S)2 and (pCl- PhSe)2 to basal rates. The concentrations of these compounds needed to inhibit TBARS formation by 50% (IC50) are 1.71 microM, 3.73 microM, 1.63 microM, 9.85 microM, >33.3 microM, 23.2 microM and 4.83 microM, respectively for QA. For TBARS production induced by SNP the IC50 was 2.02 microM, 12.5 microM, 2.80 microM, >33.3 microM, 24.5 microM and 7.55 microM, respectively. The compounds (AA-Te)2 and (PhS)2 have no antioxidant activity and pro-oxidant activity, respectively. These results suggest that (AA-Se)2 and (AA-S)2 can be considered as potential pharmaceutical antioxidant agents.
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Affiliation(s)
- J I Rossato
- Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, RS, Brasil
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Abstract
We carried out time-series analysis in 12 U.S. cities to estimate both the acute effects and the lagged influence of weather on total daily deaths. We fit generalized additive Poisson regressions for each city using nonparametric smooth functions to control for long time trend and barometric pressure. We also controlled for day of the week. We estimated the effect and the lag structure of both temperature and humidity on the basis of a distributed lag model. In cold cities, both high and low temperatures were associated with increased deaths. In general, the effect of cold temperatures persisted for days, whereas the effect of high temperatures was restricted to the day of the death or the immediately preceding day and was twice as large as the cold effect. The hot temperature effect appears to be primarily harvesting. In hot cities, neither hot nor cold temperatures had much effect on deaths. The magnitude of the effect of hot temperature varied with central air conditioning use and the variance of summertime temperatures. We saw no clear pattern for humidity effect. These dissimilarities indicate that analysis of the impact of any climatic change should take into account regional weather differences and harvesting.
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Affiliation(s)
- A L Braga
- Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA
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Abstract
To assess differences in the lag structure pattern between particulate matter < 10 microns/100 microns in diameter (PM10) and cause-specific mortality, we performed a time-series analysis in 10 US cities using generalized additive Poisson regressions in each city; nonparametric smooth functions were used to control for long time trend, weather, and day of the week. The PM10 effect was estimated based on its daily mean, 2-day moving average, and the cumulative 7-day effect by means of an unconstrained distributed lag model. A 10-microgram/m3 increase in the 7-day mean of PM10 was associated with increases in deaths due to pneumonia (2.7%, 95% confidence interval [CI]: 1.5, 3.9), chronic obstructive pulmonary disease (1.7%, 95% CI: 0.1, 3.3), and all cardiovascular diseases (1.0%, 95% CI: 0.6, 1.4). A 10-microgram/m3 increase in the 2-day mean of PM10 was associated with a 0.7% (95% CI: 0.3, 1.1) increase in deaths from myocardial infarction. When the distributed lag was assessed, two different patterns could be observed: respiratory deaths were more affected by air pollution levels on the previous days, whereas cardiovascular deaths were more affected by same-day pollution. These results contribute to the overall efforts so far in understanding how exposure to air pollution promotes adverse health effects.
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Affiliation(s)
- A L Braga
- Environmental Epidemiology Program, Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Bldg I, Room 1414, Boston, MA 02115, USA.
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Maciel EN, Bolzan RC, Braga AL, Rocha JB. Diphenyl diselenide and diphenyl ditelluride differentially affect delta-aminolevulinate dehydratase from liver, kidney, and brain of mice. J Biochem Mol Toxicol 2001; 14:310-9. [PMID: 11083084 DOI: 10.1002/1099-0461(2000)14:6<310::aid-jbt3>3.0.co;2-d] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In the present study, the inhibitory effect of diphenyl diselenide and diphenyl ditelluride after in vitro, acute (a single dose), or chronic exposure (14 doses) was examined in mice 24 hours after the last administration. In vitro, diphenyl diselenide, and diphenyl ditelluride inhibited delta-aminolevulinate dehydratase (delta-ALA-D) from brain, liver, and kidney with a similar potency (IC50 5-10 microM), and at 120 microM, they increased the rate of dithiothreitol (DTT) and reduced glutathione (GSH) oxidation. After a single dose (sc), diphenyl diselenide (1 mmol/kg) inhibited the liver (22%, p < 0.01) and brain (27%, p < 0.01) delta-ALA-D, but it did not inhibit the kidney enzyme. After a single dose (sc), diphenyl ditelluride (0.5 mmol/kg) inhibited liver (46%, p < 0.01), kidney (21%, p < 0.05), and brain (39%, p < 0.01) delta-ALA-D. Chronic exposure to diphenyl diselenide (0.125 and 0.250 mmol/kg) caused significant (p < 0.05) increase in liver and liver-to-body weight ratio and inhibited liver (40 and 60%, respectively) and brain (21 and 40%, respectively) delta-ALA-D. Kidney delta-ALA-D was not inhibited significantly after exposure to diphenyl diselenide. Total nonprotein - SH concentration was decreased only in liver of animals exposed for 14 days to selenide. Chronic exposure to diphenyl ditelluride (0.010 and 0.025 mmol/kg) caused significant (p < 0.05) inhibition of liver (28 and 42%, respectively) and brain (23 and 54%, respectively) delta-ALA-D. Kidney delta-ALA-D was not inhibited significantly by diphenyl ditelluride. Total nonprotein--SH concentration was decreased to a different extent after acute or chronic treatment with diphenyl ditelluride depending on analyzed tissue. Hemoglobin content was decreased significantly by 17 and 22% after chronic treatment with 0.125 and 0.25 mmol/kg diphenyl diselenide, respectively. Chronic exposure to 0.010 mmol/kg diphenyl ditelluride caused a reduction of 17% in hemoglobin content that tended to be significant (p < 0.10). These results suggest that delta-ALA-D inhibition after exposure to organochalcogens may perturb heme-dependent metabolic pathway and contribute to the toxicological properties of these compounds.
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Affiliation(s)
- E N Maciel
- Departamento de Quimica, Centro de Ciencias Naturais e Exatas, Universidade Federal de Santa Maria, RS, Brasil
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Abstract
Four linear polyacetylenic compounds were synthesized. Pentadeca-6,8,10-triynoic acid 1 and octadeca-8,10,12-triynoic acid 2 were synthesized by using acetylene coupling reactions. The syntheses of (Z)-hexadec-11-en-7,9-diynoic acid 3 and (Z)-octadec-12-en-7,9-diynoic acid 4 by using vinylic telluride coupling reactions were accomplished.
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Affiliation(s)
- G Zeni
- Departamento de Química, Laboratório de Bioquímica Toxicológica, UFSM, 97105-900 Santa Maria, RS, Brazil.
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Abstract
The effect of two selenides and their selenoxides on delta-aminolevulinic acid dehydratase (delta-ALA-D) from liver of adult rats was investigated. In vivo, selenides can be oxidized to selenoxides by flavin-containing monooxygenases (FMO) and selenoxides can regenerate selenides by thiol oxidation. Phenyl methyl selenide (PhSeCH3) and 1-hexynyl methyl selenide (C4H9Ctriple bondCSeCH3) were converted to selenoxides by reaction with H2O2. PhSeCH3 and C4H9Ctriple bondCSeCH3 had no effect on delta-ALA-D up to 400 microM. Conversely, their selenoxides inhibited delta-ALA-D, and the IC(50) for enzyme inhibition was about 100 and 70 microM, respectively. Partially purified delta-ALA-D (P(55)) from swine liver was also inhibited by these selenoxides. The inhibitory action of selenoxides was antagonized by dithiotreitol (DTT). Moreover, delta-ALA-D from a plant source was inhibited by the selenoxides, suggesting a possible involvement of SH groups in a distinct site of the homologous region implicated in Zn2+ binding in mammalian delta-ALA-D. After exposure to PhSeCH3 (500 micromol/kg/day) for 45 or 30 days, the activity of delta-ALA-D from liver of mice decreased to about 50% of the control group. The in vivo inhibitory action of this compound was not antagonized by DTT. PhSeCH3 and C4H9Ctriple bondCSeCH3 had no effect on the rate of DTT oxidation, but their selenoxides oxidized DTT. The results of the present study suggest that hepatic delta-ALA-D of rodents is a potential molecular target for selenides as a consequence of their metabolism to selenoxides by FMO.
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Affiliation(s)
- M Farina
- Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900, RS, Santa Maria, Brazil
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Braga AL, Saldiva PH, Pereira LA, Menezes JJ, Conceição GM, Lin CA, Zanobetti A, Schwartz J, Dockery DW. Health effects of air pollution exposure on children and adolescents in São Paulo, Brazil. Pediatr Pulmonol 2001; 31:106-13. [PMID: 11180685 DOI: 10.1002/1099-0496(200102)31:2<106::aid-ppul1017>3.0.co;2-m] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Children and adolescents have been considered more susceptible to the effects of air pollution than adults. In order to investigate the responses of children of different ages to air pollution exposure, daily records of hospital admissions for children in five age groups (equal or less than 2 years of age, 3-5, 6-13, 14-19, and all ages together, i.e., from 0-19 years of age) were obtained from January 1993 to November 1997 in São Paulo, Brazil, and were compared to daily records of PM10, O3, SO2, CO and NO2 concentrations in ambient air. For each age group a generalized additive Poisson regression was fitted controlling for smooth functions of time, temperature, humidity, and days of the week, with an additional indicator for holidays. Polynomial distributed lag models were used to estimate the 7-day cumulative effect of each pollutant. Children 2 years or less were the most susceptible to the effects of all five pollutants with an increase of 9.4% (95% CI: 7.9,10.9) in respiratory admissions associated with each interquartile range increase in PM10. The oldest group was the second most susceptible to air pollutants, with each interquartile range increase in PM10 associated with a 5.1% (95% CI: 0.3,9.8) increase in respiratory admissions. An interquartile range increase in CO was associated with an 11.3% (95% CI: 5.9,16.8) increase in respiratory hospitalizations. When a multipollutant model was used, the effect of PM10 on respiratory admissions for all ages together was unchanged, while the SO2 and the other pollutants effect was substantially reduced. This study showed that daily respiratory hospital admissions for children and adolescents in São Paulo increased with air pollution, and that the largest effects were found for the youngest (2 years or less) and oldest (14-19 years) age groups.
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Affiliation(s)
- A L Braga
- Environmental Pediatrics Program, Department of Pediatrics, University of Santo Amaro School of Medicine, São Paulo, Brazil.
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Braga AL, Saldiva PH, Pereira LA, Menezes JJ, Conceição GM, Lin CA, Zanobetti A, Schwartz J, Dockery DW. Health effects of air pollution exposure on children and adolescents in São Paulo, Brazil. Pediatr Pulmonol 2001; 31:106-113. [PMID: 11180685 DOI: 10.1002/1099-0496(200102)31] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Children and adolescents have been considered more susceptible to the effects of air pollution than adults. In order to investigate the responses of children of different ages to air pollution exposure, daily records of hospital admissions for children in five age groups (equal or less than 2 years of age, 3-5, 6-13, 14-19, and all ages together, i.e., from 0-19 years of age) were obtained from January 1993 to November 1997 in São Paulo, Brazil, and were compared to daily records of PM10, O3, SO2, CO and NO2 concentrations in ambient air. For each age group a generalized additive Poisson regression was fitted controlling for smooth functions of time, temperature, humidity, and days of the week, with an additional indicator for holidays. Polynomial distributed lag models were used to estimate the 7-day cumulative effect of each pollutant. Children 2 years or less were the most susceptible to the effects of all five pollutants with an increase of 9.4% (95% CI: 7.9,10.9) in respiratory admissions associated with each interquartile range increase in PM10. The oldest group was the second most susceptible to air pollutants, with each interquartile range increase in PM10 associated with a 5.1% (95% CI: 0.3,9.8) increase in respiratory admissions. An interquartile range increase in CO was associated with an 11.3% (95% CI: 5.9,16.8) increase in respiratory hospitalizations. When a multipollutant model was used, the effect of PM10 on respiratory admissions for all ages together was unchanged, while the SO2 and the other pollutants effect was substantially reduced. This study showed that daily respiratory hospital admissions for children and adolescents in São Paulo increased with air pollution, and that the largest effects were found for the youngest (2 years or less) and oldest (14-19 years) age groups.
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Affiliation(s)
- A L Braga
- Environmental Pediatrics Program, Department of Pediatrics, University of Santo Amaro School of Medicine, São Paulo, Brazil.
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Arbex MA, Böhm GM, Saldiva PH, Conceição GM, Pope AC, Braga AL. Assessment of the effects of sugar cane plantation burning on daily counts of inhalation therapy. J Air Waste Manag Assoc 2000; 50:1745-1749. [PMID: 11288302 DOI: 10.1080/10473289.2000.10464211] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study was designed to evaluate the association between sugar cane plantation burning and hospital visits in Araraquara in the state of São Paulo, Brazil. From June 1 to August 31, 1995, the daily number of visits of patients who needed inhalation therapy in one of the main hospitals of the city was recorded and used as health impairment estimation. Sedimentation of particle mass (the amount of particles deposited on four containers filled with water) was measured daily. The association between the weight of the sediment and the number of visits was evaluated by means of Poisson regression models controlled for seasonality, temperature, day of the week, and rain. We found a significant and dose-dependent relationship between the number of visits and the amount of sediment. The relative risk of visit associated with an increase of 10 mg in the sediment weight was 1.09 (1-1.19), and the relative risk of an inhalation therapy was 1.20 (1.03-1.39) on the most polluted days (fourth quartile of sediment mass). These results indicate that sugar cane burning may cause deleterious health effects in the exposed population.
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Affiliation(s)
- M A Arbex
- Laboratory of Experimental Air Pollution, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
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Abstract
Daily deaths are associated with air pollution. This association might be con*hhy;founded by uncontrolled risk factors. In order to estimate the potential confounding caused by respiratory epidemics of the association between air pollution and health effects, a time series study of air pollution and daily deaths was carried out. Daily records of deaths for all ages were obtained from five US cities: Chicago, IL; Detroit, MI; Minneapolis, MN; Pittsburgh, PA; and Seattle, WA. Daily levels of particles with a 50% cut-off aerodynamic diameter of 10 microm (PM10) and weather measurements were obtained. City-specific analysis was carried out using Poisson regression, adjusting for time trend, ambient temperature, dew point, barometric pressure and day of the week. A cubic polynomial was used for each epidemic period (> or =10 days of excessive pneumonia hospital admissions), and a dummy variable was used to control for isolated epidemic days. A 10-microg x m(-3) increase in PM10 concentration (lag 0-1) was associated with increased daily deaths in Chicago (0.81%, 95% confidence internal (CI) 0.54-1.09); Detroit (0.87%, 95% CI 0.60-1.15), Minneapolis (1.34%, 95% CI 0.78-1.90), Pittsburgh (0.84%, 95% CI 0.51-1.18) and Seattle (0.52%, 95% CI 0.11-0.94). When controlling for respiratory epidemics, small decreases in the PMlo effect were observed (Chicago 9%, Detroit 11%, Minneapolis 3%, Pittsburgh 5%, and Seattle 15%). The overall effect of PM10 concentration was 0.85% (95% CI 0.60-1.10) per 10 microg x m(-3) before controlling for epidemics and 0.78% (95% CI 0.51-1.05) after. This study showed that the association between air pollution and daily deaths is not due to failure to control for influenza or pneumonia epidemics.
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Affiliation(s)
- A L Braga
- Dept of Environmental Health, Harvard, School of Public Health, Boston, MA 02115, USA
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André PA, Braga AL, Lin CA, Conceição GM, Pereira LA, Miraglia SG, Böhm GM. Environmental epidemiology applied to urban atmospheric pollution: a contribution from the Experimental Air Pollution Laboratory (LPAE). CAD SAUDE PUBLICA 2000; 16:619-28. [PMID: 11035502 DOI: 10.1590/s0102-311x2000000300011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Systematic investigation on the effects of human exposure to environmental pollution using scientific methodology only began in the 20th century as a consequence of several environmental accidents followed by an unexpected mortality increase above expected mortality and as a result of observational epidemiological and toxicological studies conducted on animals in developed countries. This article reports the experience of the Experimental Air Pollution Laboratory at the School of Medicine, University of São Paulo, concerning the respiratory system and pathophysiological mechanisms involved in responses to exposure to pollution using toxicological and experimental procedures, complemented by observational epidemiological studies conducted in the city of São Paulo. It also describes these epidemiological studies, pointing out that air pollution is harmful to public health, not only among susceptible groups but also in the general population, even when the concentration of pollutants is below the limits set by environmental legislation. The study provides valuable information to support the political and economic decision-making processes aimed at preserving the environment and enhancing quality of life.
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Affiliation(s)
- P A André
- Laboratory of Experimental Air Pollution, Medical School, University of São Paulo, São Paulo, SP, 01246-903, Brazil.
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Pereira LA, Loomis D, Conceição GM, Braga AL, Arcas RM, Kishi HS, Singer JM, Böhm GM, Saldiva PH. Association between air pollution and intrauterine mortality in São Paulo, Brazil. Environ Health Perspect 1998; 106:325-9. [PMID: 9618348 PMCID: PMC1532988 DOI: 10.1289/ehp.98106325] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The associations among daily counts of intrauterine mortality and pollutant concentrations (NO2, SO2, CO, O3, and particulate matter (3/4)10 microm) were investigated for the period ranging from January 1991 to December 1992 in the city of São Paulo, Brazil. We used Poisson regression techniques, adjusted for season and weather. The association between intrauterine mortality and air pollution was strong for NO2 (coefficient = 0.0013/ microg/m3; p<0.01) but lesser for SO2 (coefficient = 0.0005/ microg/m3; p<0.10) and CO (coefficient = 0.0223/ppm; p<0.10). A significant association was observed when an index that combined these three pollutants was considered in the models instead of considering each pollutant individually (p<0.01). These associations exhibited a short time lag, not over 5 days. In addition, some evidence of fetal exposure to air pollution was obtained by disclosing a significant association between the levels of carboxyhemoglobin of blood sampled from the umbilical cord and ambient CO levels in children delivered by nonsmoking pregnant women in the period from May to July 1995. Our results suggest that air pollution in São Paulo may promote adverse health effects on fetuses.
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Affiliation(s)
- L A Pereira
- Laboratório de Poluição Atmosférica Experimental, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brasil
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Pereira LA, Loomis D, Conceição GM, Braga AL, Arcas RM, Kishi HS, Singer JM, Böhm GM, Saldiva PH. Association between air pollution and intrauterine mortality in São Paulo, Brazil. Environ Health Perspect 1998; 106:325-329. [PMID: 9618348 DOI: 10.2307/3434038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The associations among daily counts of intrauterine mortality and pollutant concentrations (NO2, SO2, CO, O3, and particulate matter (3/4)10 microm) were investigated for the period ranging from January 1991 to December 1992 in the city of São Paulo, Brazil. We used Poisson regression techniques, adjusted for season and weather. The association between intrauterine mortality and air pollution was strong for NO2 (coefficient = 0.0013/ microg/m3; p<0.01) but lesser for SO2 (coefficient = 0.0005/ microg/m3; p<0.10) and CO (coefficient = 0.0223/ppm; p<0.10). A significant association was observed when an index that combined these three pollutants was considered in the models instead of considering each pollutant individually (p<0.01). These associations exhibited a short time lag, not over 5 days. In addition, some evidence of fetal exposure to air pollution was obtained by disclosing a significant association between the levels of carboxyhemoglobin of blood sampled from the umbilical cord and ambient CO levels in children delivered by nonsmoking pregnant women in the period from May to July 1995. Our results suggest that air pollution in São Paulo may promote adverse health effects on fetuses.
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Affiliation(s)
- L A Pereira
- Laboratório de Poluição Atmosférica Experimental, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brasil
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Barbosa NB, Rocha JB, Zeni G, Emanuelli T, Beque MC, Braga AL. Effect of organic forms of selenium on delta-aminolevulinate dehydratase from liver, kidney, and brain of adult rats. Toxicol Appl Pharmacol 1998; 149:243-53. [PMID: 9571994 DOI: 10.1006/taap.1998.8373] [Citation(s) in RCA: 143] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The inhibitory effect of various forms of organic selenium compounds and of diphenyl ditelluride (PhTe)2 on delta-aminolevulinate dehydratase (delta-ALA-D) from liver, kidney, and brain of rats was investigated because it has been reported that organocalcogens catalyze the oxidation of thiols. Diphenyl diselenide (PhSe)2, rho-chloro-diphenyl diselenide (rho ClPhSe)2, propyl-2-2-diphenyl diselenide, and propyl-2-methoxy-2-phenyl selenide inhibited delta-ALA-D and the IC50 ranged from 2 to 32 microM depending on the selenium compound and whether it was preincubated with the enzyme. (rho ClPhSe)2 was the most potent inhibitor of delta-ALA-D, and preincubation increased the inhibitory potency of all the tested compounds. Inorganic selenium compounds (sodium selenite, Na2SeO3 and selenium dioxide, SeO2) inhibited delta-ALA-D, and the potency of SeO2 was greater than that of (rho ClPhSe)2. Diphenyl ditelluride (PhTe)2 also inhibited delta-ALA-D but with relatively lower potency than that of organic and inorganic selenium compounds. The inhibitory effect of propyl-2-2-diphenyl diselenide and propyl-2-methoxy-2-phenyl selenide seems to be mediated by (PhSe)2 since the compounds decomposed rapidly to (PhSe)2 in aqueous medium. The inhibitory action of selenium forms on delta-ALA-D from liver, kidney, and brain was antagonized by sulfhydryl protecting agents (dithiotreitol and reduced glutathione). The effects of organic selenium compounds on delta-ALA-D were related to the stability of the Se-Se (or Se-C) bond because the compound methyl-diphenyl diselenide (which possesses the most stable Se-C-Se bond) did not inhibit the enzyme. The inhibitory action of (PhSe)2 was not related to the formation of oxyradicals in the medium since superoxide dismutase and catalase did not affect the inhibition of delta-ALA-D by (PhSe)2. delta-ALA-D from cucumber leaves was not inhibited by selenium or tellurium compounds which suggests that these compounds act directly on the B or beta-site of the animal enzyme. These results suggest that delta-ALA-D from liver, kidney, and brain is a potential molecular target for the toxic effect of organic forms of selenium and tellurium.
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Affiliation(s)
- N B Barbosa
- Departamento de Quimica, Centro de Ciencias Naturais e Exatas, Santa Maria, RS, Brasil
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