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Ahmed S, Adams DJ, Haniffa M, Maartens A, Arruda MA. Targeted action to increase inclusion at the Wellcome Sanger Institute. eLife 2024; 13:e94732. [PMID: 38381132 PMCID: PMC10881119 DOI: 10.7554/elife.94732] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 02/12/2024] [Indexed: 02/22/2024] Open
Abstract
The Sanger Excellence Fellowship has been established to increase the representation of researchers with Black-heritage backgrounds at a leading research centre in the UK.
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Affiliation(s)
- Saher Ahmed
- Wellcome Sanger InstituteHinxtonUnited Kingdom
- Genome Research LimitedHinxtonUnited Kingdom
| | | | - Muzlifah Haniffa
- Wellcome Sanger InstituteHinxtonUnited Kingdom
- Newcastle UniversityNewcastle upon TyneUnited Kingdom
- Newcastle Hospitals NHS Foundation TrustNewcastle upon TyneUnited Kingdom
| | | | - Maria Augusta Arruda
- Brazilian Biosciences National Laboratory, National Center for Research in Energy and Materials (LNBIO-CNPEM)São PauloBrazil
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2
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Quilles Junior JC, Carlos FDRR, Montanari A, Leitão A, Mignone VW, Arruda MA, Turyanska L, Bradshaw TD. Apoferritin encapsulation of cysteine protease inhibitors for cathepsin L inhibition in cancer cells. RSC Adv 2019; 9:36699-36706. [PMID: 35539052 PMCID: PMC9075514 DOI: 10.1039/c9ra07161j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 09/06/2019] [Accepted: 11/04/2019] [Indexed: 11/21/2022] Open
Abstract
Cysteine proteases play a key role in tumorigenesis causing protein degradation and promoting invasive tumour growth. Cathepsin L is overexpressed in cancer cells and could provide a specific target for delivery of anticancer agents. We encapsulated novel dipeptidyl nitrile based cysteine protease inhibitors (Neq0551, Neq0554 and Neq0568) into biocompatible apoferritin (AFt) protein nanocages to achieve specific delivery to tumours and pH-induced drug release. AFt-encapsulated Neq0554 demonstrated ∼3-fold enhanced in vitro activity (GI50 = 79 μM) compared to naked agent against MiaPaCa-2 pancreatic carcinoma cells. Selectivity for cancer cells was confirmed by comparing their activity to non-tumourigenic human fibroblasts (GI50 > 200 μM). Transferrin receptor (TfR-1) expression, detected only in lysates prepared from carcinoma cells, may contribute to the cancer-selectivity. The G1 cell cycle arrest caused by AFt-Neq0554 resulting in cytostasis was corroborated by clonogenic assays. Superior and more persistent inhibition of cathepsin L up to 80% was achieved with AFt-encapsulated agent in HCT-116 cells following 6 h exposure to 50 μM agent. The selective anticancer activity of AFt-encapsulated cysteine protease inhibitor Neq0554 reported here warrants further preclinical in vivo evaluation. Novel apoferritin encapsulated cysteine protease inhibitors are developed with enhanced and selective uptake by cancer cells, and sustained pH-induced release of the agent. The persistent inhibition of cathepsin L is demonstrated in vitro.![]()
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Affiliation(s)
- José C. Quilles Junior
- Centre for Biomolecular Sciences
- School of Pharmacy
- University of Nottingham
- UK
- Medicinal Chemistry Group (NEQUIMED)
| | | | - A. Montanari
- Medicinal Chemistry Group (NEQUIMED)
- São Carlos Institute of Chemistry (IQSC)
- University of São Paulo
- Brazil
| | - Andrei Leitão
- Medicinal Chemistry Group (NEQUIMED)
- São Carlos Institute of Chemistry (IQSC)
- University of São Paulo
- Brazil
| | | | | | | | - Tracey D. Bradshaw
- Centre for Biomolecular Sciences
- School of Pharmacy
- University of Nottingham
- UK
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3
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Peach CJ, Mignone VW, Arruda MA, Alcobia DC, Hill SJ, Kilpatrick LE, Woolard J. Molecular Pharmacology of VEGF-A Isoforms: Binding and Signalling at VEGFR2. Int J Mol Sci 2018; 19:E1264. [PMID: 29690653 PMCID: PMC5979509 DOI: 10.3390/ijms19041264] [Citation(s) in RCA: 249] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 04/14/2018] [Accepted: 04/16/2018] [Indexed: 02/07/2023] Open
Abstract
Vascular endothelial growth factor-A (VEGF-A) is a key mediator of angiogenesis, signalling via the class IV tyrosine kinase receptor family of VEGF Receptors (VEGFRs). Although VEGF-A ligands bind to both VEGFR1 and VEGFR2, they primarily signal via VEGFR2 leading to endothelial cell proliferation, survival, migration and vascular permeability. Distinct VEGF-A isoforms result from alternative splicing of the Vegfa gene at exon 8, resulting in VEGFxxxa or VEGFxxxb isoforms. Alternative splicing events at exons 5⁻7, in addition to recently identified posttranslational read-through events, produce VEGF-A isoforms that differ in their bioavailability and interaction with the co-receptor Neuropilin-1. This review explores the molecular pharmacology of VEGF-A isoforms at VEGFR2 in respect to ligand binding and downstream signalling. To understand how VEGF-A isoforms have distinct signalling despite similar affinities for VEGFR2, this review re-evaluates the typical classification of these isoforms relative to the prototypical, “pro-angiogenic” VEGF165a. We also examine the molecular mechanisms underpinning the regulation of VEGF-A isoform signalling and the importance of interactions with other membrane and extracellular matrix proteins. As approved therapeutics targeting the VEGF-A/VEGFR signalling axis largely lack long-term efficacy, understanding these isoform-specific mechanisms could aid future drug discovery efforts targeting VEGF receptor pharmacology.
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Affiliation(s)
- Chloe J Peach
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
| | - Viviane W Mignone
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
- CAPES-University of Nottingham Programme in Drug Discovery, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
| | - Maria Augusta Arruda
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
- CAPES-University of Nottingham Programme in Drug Discovery, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
| | - Diana C Alcobia
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
| | - Stephen J Hill
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
| | - Laura E Kilpatrick
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
| | - Jeanette Woolard
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham and University of Nottingham, Midlands NG7 2UH, UK.
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Abstract
PURPOSE OF REVIEW Headache is a common complaint among children and adolescents. School functioning is one of the most important life domains impacted by chronic pain in children. This review discusses the epidemiological and pathophysiological connections between headaches and school functioning including a suggested clinical approach. RECENT FINDINGS The connection between recurrent and chronic headache and learning disabilities might be psychosocial (fear of failure) or anatomical (malfunctioning of the frontal and prefrontal areas). Only few population-based and clinical studies were done and good studies are still needed in order to understand the complex relationship better. However, relating to our patients' learning and school performance, history is crucial when a child with primary headaches is evaluated. Learning disabilities seem to have a high prevalence among children with primary headache syndromes especially migraine. The connection between the two is complex and might be either part of a common brain pathophysiology and/or a consequence of poor quality of life.
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Affiliation(s)
- J Genizi
- Pediatric Neurology Unit, Bnai Zion Medical Center, Bruce and Ruth Rappaport Faculty of Medicine, Technion, Haifa, Israel.
| | - V Guidetti
- Department of Pediatrics and Child Neuropsychiatry, University "La Sapienza", Rome, Italy
| | - M A Arruda
- Glia Institute, Ribeirão Preto, SP, Brazil
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Arruda MA, Stoddart LA, Gherbi K, Briddon SJ, Kellam B, Hill SJ. A Non-imaging High Throughput Approach to Chemical Library Screening at the Unmodified Adenosine-A 3 Receptor in Living Cells. Front Pharmacol 2017; 8:908. [PMID: 29321740 PMCID: PMC5733478 DOI: 10.3389/fphar.2017.00908] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 11/28/2017] [Indexed: 12/29/2022] Open
Abstract
Recent advances in fluorescent ligand technology have enabled the study of G protein-coupled receptors in their native environment without the need for genetic modification such as addition of N-terminal fluorescent or bioluminescent tags. Here, we have used a non-imaging plate reader (PHERAstar FS) to monitor the binding of fluorescent ligands to the human adenosine-A3 receptor (A3AR; CA200645 and AV039), stably expressed in CHO-K1 cells. To verify that this method was suitable for the study of other GPCRs, assays at the human adenosine-A1 receptor, and β1 and β2 adrenoceptors (β1AR and β2AR; BODIPY-TMR-CGP-12177) were also carried out. Affinity values determined for the binding of the fluorescent ligands CA200645 and AV039 to A3AR for a range of classical adenosine receptor antagonists were consistent with A3AR pharmacology and correlated well (R2 = 0.94) with equivalent data obtained using a confocal imaging plate reader (ImageXpress Ultra). The binding of BODIPY-TMR-CGP-12177 to the β1AR was potently inhibited by low concentrations of the β1-selective antagonist CGP 20712A (pKi 9.68) but not by the β2-selective antagonist ICI 118551(pKi 7.40). Furthermore, in experiments conducted in CHO K1 cells expressing the β2AR this affinity order was reversed with ICI 118551 showing the highest affinity (pKi 8.73) and CGP20712A (pKi 5.68) the lowest affinity. To determine whether the faster data acquisition of the non-imaging plate reader (~3 min per 96-well plate) was suitable for high throughput screening (HTS), we screened the LOPAC library for inhibitors of the binding of CA200645 to the A3AR. From the initial 1,263 compounds evaluated, 67 hits (defined as those that inhibited the total binding of 25 nM CA200645 by ≥40%) were identified. All compounds within the library that had medium to high affinity for the A3AR (pKi ≥6) were successfully identified. We found three novel compounds in the library that displayed unexpected sub-micromolar affinity for the A3AR. These were K114 (pKi 6.43), retinoic acid p-hydroxyanilide (pKi 6.13) and SU 6556 (pKi 6.17). Molecular docking of these latter three LOPAC library members provided a plausible set of binding poses within the vicinity of the established orthosteric A3AR binding pocket. A plate reader based library screening using an untagged receptor is therefore possible using fluorescent ligand opening the possibility of its use in compound screening at natively expressed receptors.
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Affiliation(s)
- Maria Augusta Arruda
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, The Midlands, United Kingdom
- Vice-Diretoria de Ensino, Pesquisa e Inovacao, Farmanguinhos, Fiocruz, Rio de Janeiro, Brazil
| | - Leigh A. Stoddart
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, The Midlands, United Kingdom
| | - Karolina Gherbi
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, The Midlands, United Kingdom
| | - Stephen J. Briddon
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, The Midlands, United Kingdom
| | - Barrie Kellam
- Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Stephen J. Hill
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, The Midlands, United Kingdom
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6
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Affiliation(s)
- H M da Silva
- Instituto de Neurologia e Cefaléia, Rua Casemiro de Abreu 544, Ribeirão Preto, CEP 14030-060 São Paulo, RP, Brazil
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Rodrigues SS, Caminha MFC, Ferraz MGG, Arruda MA, Kozmhinshy VMR, Guerra CARM, Figueirôa JN. Knowledge, Attitude and Practice of the Nursing Team Regarding Oral Health Care in Intensive Care Units in aReference Hospital of Recife, Brazil. Pesqui bras odontopediatria clín integr 2016. [DOI: 10.4034/pboci.2016.161.14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Ribeiro-Pereira C, Moraes JA, Souza MDJ, Laurindo FR, Arruda MA, Barja-Fidalgo C. Redox modulation of FAK controls melanoma survival--role of NOX4. PLoS One 2014; 9:e99481. [PMID: 24911159 PMCID: PMC4050056 DOI: 10.1371/journal.pone.0099481] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 05/15/2014] [Indexed: 01/08/2023] Open
Abstract
Studies have demonstrated that reactive oxygen species (ROS) generated by NADPH oxidase are essential for melanoma proliferation and survival. However, the mechanisms by which NADPH oxidase regulates these effects are still unclear. In this work, we investigate the role of NADPH oxidase-derived ROS in the signaling events that coordinate melanoma cell survival. Using the highly metastatic human melanoma cell line MV3, we observed that pharmacological NADPH oxidase inhibition reduced melanoma viability and induced dramatic cellular shape changes. These effects were accompanied by actin cytoskeleton rearrangement, diminished FAKY397 phosphorylation, and decrease of FAK-actin and FAK-cSrc association, indicating disassembly of focal adhesion processes, a phenomenon that often results in anoikis. Accordingly, NADPH oxidase inhibition also enhanced hypodiploid DNA content, and caspase-3 activation, suggesting activation of the apoptotic machinery. NOX4 is likely to be involved in these effects, since silencing of NOX4 significantly inhibited basal ROS production, reduced FAKY397 phosphorylation and decreased tumor cell viability. Altogether, the results suggest that intracellular ROS generated by the NADPH oxidase, most likely NOX4, transmits cell survival signals on melanoma cells through the FAK pathway, maintaining adhesion contacts and cell viability.
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Affiliation(s)
- Cristiane Ribeiro-Pereira
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - João Alfredo Moraes
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Mariele de Jesus Souza
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Francisco R. Laurindo
- Laboratory of Vascular Biology, Instituto do Coração, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Maria Augusta Arruda
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Vice-Diretoria de Ensino, Pesquisa e Inovação, Farmanguinhos, Fiocruz, Rio de Janeiro, RJ, Brazil
| | - Christina Barja-Fidalgo
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- * E-mail:
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de Luca B, Xavier-Elsas P, Barradas M, Luz RA, Queto T, Jones C, Arruda MA, Cunha TM, Cunha FQ, Gaspar-Elsas MI. Essential roles of PKA, iNOS, CD95/CD95L, and terminal caspases in suppression of eosinopoiesis by PGE2 and other cAMP-elevating agents. ScientificWorldJournal 2013; 2013:208705. [PMID: 24376378 PMCID: PMC3859205 DOI: 10.1155/2013/208705] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 09/12/2013] [Indexed: 02/08/2023] Open
Abstract
Up- and downregulation of eosinopoiesis control pulmonary eosinophilia in human asthma. In mice, eosinopoiesis is suppressed in vitro by prostaglandin E2 (PGE2) and in vivo by diethylcarbamazine, through a proapoptotic mechanism sequentially requiring inducible NO synthase (iNOS) and the ligand for death receptor CD95 (CD95L). We examined the roles of iNOS, cAMP-mediated signaling, caspases, and CD95L/CD95 in suppression of eosinopoiesis by PGE2 and other agents signaling through cAMP. Bone-marrow collected from BALB/c mice, or from iNOS-, CD95-, or CD95L-deficient mutants (and wild-type controls), was cultured with interleukin-5 (IL-5), alone or associated with PGE2, cAMP-inducing/mimetic agents, caspase inhibitor zVAD-fmk, iNOS inhibitor aminoguanidine, or combinations thereof, and eosinopoiesis was evaluated at various times. PGE2, added up to 24 hours of culture, dose-dependently suppressed eosinopoiesis, by inducing apoptosis. This effect was (a) paralleled by induction of iNOS in eosinophils; (b) duplicated by sodium nitroprusside, isoproterenol, and cAMP-inducing/mimetic agents; (c) prevented by protein kinase A inhibition. NO was produced through iNOS by dibutyryl-cAMP-stimulated bone-marrow. Overall, PGE2 and isoproterenol shared a requirement for four effector elements (iNOS, CD95L, CD95, and terminal caspases), which together define a pathway targeted by several soluble up- and downmodulators of eosinopoiesis, including drugs, mediators of inflammation, and cytokines.
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Affiliation(s)
- Bianca de Luca
- Department of Pediatrics, Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira, FIOCRUZ, Avenue Rui Barbosa 716, 22250-020 Rio de Janeiro, RJ, Brazil
| | - Pedro Xavier-Elsas
- Department of Immunology, Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, CCS, Bloco I, Room I-2-066, 22205-020, Rio de Janeiro, Brazil
| | - Mônica Barradas
- Department of Immunology, Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, CCS, Bloco I, Room I-2-066, 22205-020, Rio de Janeiro, Brazil
| | - Ricardo A. Luz
- Department of Immunology, Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, CCS, Bloco I, Room I-2-066, 22205-020, Rio de Janeiro, Brazil
| | - Túlio Queto
- Department of Pediatrics, Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira, FIOCRUZ, Avenue Rui Barbosa 716, 22250-020 Rio de Janeiro, RJ, Brazil
| | - Carla Jones
- Department of Immunology, Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, CCS, Bloco I, Room I-2-066, 22205-020, Rio de Janeiro, Brazil
| | - Maria Augusta Arruda
- Farmanguinhos, FIOCRUZ, Avenue Comandante Guaranys No. 447, Jacarepaguá, 22775-903 Rio de Janeiro, RJ, Brazil
| | - Thiago Mattar Cunha
- Department of Pharmacology, Faculdade de Medicina da USP, Avenue Bandeirantes 3900, Monte Alegre, 14049-900 Ribeirão Preto, SP, Brazil
| | - Fernando Queiroz Cunha
- Department of Pharmacology, Faculdade de Medicina da USP, Avenue Bandeirantes 3900, Monte Alegre, 14049-900 Ribeirão Preto, SP, Brazil
| | - Maria Ignez Gaspar-Elsas
- Department of Pediatrics, Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira, FIOCRUZ, Avenue Rui Barbosa 716, 22250-020 Rio de Janeiro, RJ, Brazil
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Barcellos-de-Souza P, Moraes JA, de-Freitas-Junior JCM, Morgado-Díaz JA, Barja-Fidalgo C, Arruda MA. Heme modulates intestinal epithelial cell activation: involvement of NADPHox-derived ROS signaling. Am J Physiol Cell Physiol 2012; 304:C170-9. [PMID: 23114967 DOI: 10.1152/ajpcell.00078.2012] [Citation(s) in RCA: 24] [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: 12/31/2022]
Abstract
In many gut chronic inflammatory conditions, intestinal epithelium (IE) is deprived of the protection of the mucus secreted by IE-specialized cells. In these events, bleeding and subsequent lysis of erythrocytes are common. This may lead to the release of high amounts of heme in the intestinal lumen, which interacts with IE. Previous works from our group have shown that heme itself is a proinflammatory molecule, activating a number of phlogistic signaling events in a nicotinamide adenine dinucleotide phosphate oxidase (NADPHox)-dependent manner. In this study, we aim to evaluate the effects of heme upon a well-established nontransformed small intestine epithelial cell lineage (IEC 6). Our results show that free heme evokes intracellular reactive oxygen species (ROS) production by IEC 6 cells, which is inhibited both by pharmacological inhibition with diphenyleneiodonium (10 μM), a NADPHox inhibitor, and small interfering RNA-mediated suppression of NOX1, a constitutive NADPHox isoform present in intestinal epithelial cells. Focal adhesion kinase phosphorylation and actin cytoskeleton polymerization are also induced by heme in a NADPHox-dependent manner. Heme increases monolayer permeability and redistributes key modulators of cell-cell adhesion as zona occludens-1 and E-cadherin proteins via NADPHox signaling. Heme promotes IEC 6 cell migration and proliferation, phenomena also regulated by NADPHox-derived ROS. Heme, in NADPHox-activating concentrations, is able to induce mRNA expression of IL-6, a cytokine implicated in inflammatory and tumorigenic responses. These data indicate a prominent role for heme-derived signaling in the pathophysiology of intestinal mucosa dysfunction and address an important role of NADPHox activity on the pathogenesis of intestinal inflammatory conditions.
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Affiliation(s)
- Pedro Barcellos-de-Souza
- Laboratório de Farmacologia Celular e Molecular, Departamento de Biologia Celular, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Barcellos-de-Souza P, Canetti C, Barja-Fidalgo C, Arruda MA. Leukotriene B4 inhibits neutrophil apoptosis via NADPH oxidase activity: Redox control of NF-κB pathway and mitochondrial stability. Biochimica et Biophysica Acta (BBA) - Molecular Cell Research 2012; 1823:1990-7. [DOI: 10.1016/j.bbamcr.2012.07.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 07/25/2012] [Accepted: 07/27/2012] [Indexed: 12/24/2022]
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Nascimento-Silva V, Arruda MA, Barja-Fidalgo C, Fierro IM. Aspirin-triggered lipoxin A4 blocks reactive oxygen species generation in endothelial cells: a novel antioxidative mechanism. Thromb Haemost 2007; 97:88-98. [PMID: 17200775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Lipoxins and their aspirin-triggered carbon-15 epimers have emerged as mediators of key events in endogenous anti-inflammation and resolution. However, the implication of these novel lipid mediators on cardiovascular diseases such as hypertension, atherosclerosis, and heart failure has not been investigated. One of the major features shared by these pathological conditions is the increased production of reactive oxygen species (ROS) generated by vascular NAD(P)H oxidase activation. In this study, we have examined whether an aspirin-triggered lipoxin A (4) analog (ATL-1) modulates ROS generation in endothelial cells (EC). Pre-treatment of EC with ATL-1 (1 - 100 nM) completely blocked ROS production triggered by different agents, as assessed by dihydrorhodamine 123 and hydroethidine. Furthermore, ATL-1 inhibited the phosphorylation and translocation of the cytosplamic NAD(P)H oxidase subunit p47 (phox) to the cell membrane as well as NAD(P)H oxidase activity. Western blot and immunofluorescence microscopy analyses showed that ATL-1 (100 nM) impaired the redox-sensitive activation of the transcriptional factor NF- kappaB, a critical step in several events associated to vascular pathologies. These results demonstrate that ATL-1 suppresses NAD(P)H oxidase-mediated ROS generation in EC, strongly indicating that lipoxins may play a protective role against the development and progression of cardiovascular diseases.
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Affiliation(s)
- Vany Nascimento-Silva
- Departamento de Farmacologia e Psicobiologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil
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Arruda MA, Barcellos-de-Souza P, Sampaio ALF, Rossi AG, Graça-Souza AV, Barja-Fidalgo C. NADPH oxidase-derived ROS: key modulators of heme-induced mitochondrial stability in human neutrophils. Exp Cell Res 2006; 312:3939-48. [PMID: 17010337 DOI: 10.1016/j.yexcr.2006.08.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2006] [Revised: 08/24/2006] [Accepted: 08/26/2006] [Indexed: 11/19/2022]
Abstract
Heme is a proinflammatory molecule able to cause a profound delay of constitutive apoptosis of human neutrophils, an effect that likely contributes to chronic inflammation associated with hemolytic diseases. Herein we show that heme-induced delay of neutrophil apoptosis correlates with the prevention of mitochondrial potential (Deltapsi(m)) dissipation by a mechanism dependent on NADPH oxidase (NADPHox)-generated reactive oxygen species (ROS) and NF-kappaB. Deltapsi(m) maintenance is accompanied by inhibition of Bax insertion into mitochondria and by a decrease in the Bad/Bcl-X(L) ratio. Heme induces Bad degradation in a completely ROS-dependent manner, as well as Bcl-X(L) synthesis, a phenomenon that also requires NF-kappaB activation. These data indicate that heme-induced preservation of mitochondrial integrity is a critical checkpoint controlled by NADPH oxidase generated-ROS and redox-sensitive NF-kappaB activation.
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Affiliation(s)
- Maria Augusta Arruda
- Departamento de Farmacologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, Av. 28 de setembro 87-Vila Izabel, Rio de Janeiro, RJ, 20551-030 Brazil
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Abstract
Hemolytic episodes such as sickle cell disease, malaria and ischemia-reperfusion occurrence are often associated to the statement of an inflammatory response which may develop or not to a chronic inflammatory status. Although these pathological states are triggered by distinct etiological agents, all of them are associated to high levels of free heme in circulation. In this review, we aim to focus the very recent achievements that have led to the statement of free heme as a proinflammatory molecule, which may play a central role during the onset and/or persistence of inflammation during these pathologies.
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Affiliation(s)
- Maria Augusta Arruda
- Departamento de Farmacologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, 20551-030 Rio de Janeiro, RJ, Brazil.
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16
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Nascimento-Silva V, Arruda MA, Barja-Fidalgo C, Villela CG, Fierro IM. Novel lipid mediator aspirin-triggered lipoxin A4 induces heme oxygenase-1 in endothelial cells. Am J Physiol Cell Physiol 2005; 289:C557-63. [PMID: 15901601 DOI: 10.1152/ajpcell.00045.2005] [Citation(s) in RCA: 79] [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: 01/12/2023]
Abstract
Lipoxins (LX) and aspirin-triggered LX (ATL) are eicosanoids generated during inflammation via transcellular biosynthetic routes that elicit distinct anti-inflammatory and proresolution bioactions, including inhibition of leukocyte-mediated injury, stimulation of macrophage clearance of apoptotic neutrophils, repression of proinflammatory cytokine production, and inhibition of cell proliferation and migration. Recently, it was reported that aspirin induces heme oxygenase-1 (HO-1) expression on endothelial cells (EC) in a COX-independent manner, what confers protection against prooxidant insults. However, the underlying mechanisms remain unclear. In this study, we investigated whether an aspirin-triggered lipoxin A(4) stable analog, 15-epi-16-(para-fluoro)-phenoxy-lipoxin A(4) (ATL-1) was able to induce endothelial HO-1. Western blot analysis showed that ATL-1 increased HO-1 protein expression associated with increased mRNA levels on EC in a time- and concentration-dependent fashion. This phenomenon appears to be mediated by the activation of the G protein-coupled LXA(4) receptor because pertussis toxin and Boc-2, a receptor antagonist, significantly inhibited ATL-1-induced HO-1 expression. We demonstrate that treatment of EC with ATL-1 inhibited VCAM and E-selectin expression induced by TNF-alpha or IL-1beta. This inhibitory effect of the analog is modulated by HO-1 because it was blocked by SnPPIX, a competitive inhibitor that blocks HO-1 activity. Our results establish that ATL-1 induces HO-1 in human EC, revealing an undescribed mechanism for the anti-inflammatory activity of these lipid mediators.
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Affiliation(s)
- V Nascimento-Silva
- Departmento de Farmacologia e Psicobiologia, Universidade do Estado do Rio de Janeiro, Brazil
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17
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Arruda MA, Graça-Souza AV, Barja-Fidalgo C. [NO TITLE AVAILABLE]. Mem Inst Oswaldo Cruz 2005. [DOI: 10.1590/s0074-02762005000900039] [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: 11/22/2022] Open
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18
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Arruda MA, Rossi AG, de Freitas MS, Barja-Fidalgo C, Graça-Souza AV. Heme inhibits human neutrophil apoptosis: involvement of phosphoinositide 3-kinase, MAPK, and NF-kappaB. J Immunol 2004; 173:2023-30. [PMID: 15265937 DOI: 10.4049/jimmunol.173.3.2023] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
High levels of free heme are found in pathological states of increased hemolysis, such as sickle cell disease, malaria, and ischemia reperfusion. The hemolytic events are often associated with an inflammatory response that usually turns into chronic inflammation. We recently reported that heme is a proinflammatory molecule, able to induce neutrophil migration, reactive oxygen species generation, and IL-8 expression. In this study, we show that heme (1-50 microM) delays human neutrophil spontaneous apoptosis in vitro. This effect requires heme oxygenase activity, and depends on reactive oxygen species production and on de novo protein synthesis. Inhibition of ERK and PI3K pathways abolished heme-protective effects upon human neutrophils, suggesting the involvement of the Ras/Raf/MAPK and PI3K pathway on this effect. Confirming the involvement of these pathways in the modulation of the antiapoptotic effect, heme induces Akt phosphorylation and ERK-2 nuclear translocation in neutrophils. Futhermore, inhibition of NF-kappa B translocation reversed heme antiapoptotic effect. NF-kappa B (p65 subunit) nuclear translocation and I kappa B degradation were also observed in heme-treated cells, indicating that free heme may regulate neutrophil life span modulating signaling pathways involved in cell survival. Our data suggest that free heme associated with hemolytic episodes might play an important role in the development of chronic inflammation by interfering with the longevity of neutrophils.
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Affiliation(s)
- Maria Augusta Arruda
- Departamento de Farmacologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, Brazil
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19
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Abstract
[(14)C]Oleic acid injected into the hemocoel of Rhodnius prolixus females was shown to rapidly associate with lipophorin particles. Half of the lipophorin-associated [(14)C]oleic acid was transferred in about 5 min to different organs, but the midgut was the main organ to take it up on day 10 after a blood meal. The rate of [(14)C]oleic acid incorporation by the midgut was high up to 15 min after injection and then declined. The [(14)C]oleic acid incorporated by the midgut was found in phospholipids (58.6%) and neutral lipids (37.4%). The midgut capacity to incorporate [(14)C]oleic acid varied on different days after a meal: it increased up to day 10 and then decreased. The fate of the [(14)C]lipids synthesized by the midgut was followed and it was observed that 10 days after feeding diacylglycerol was the main lipid released to hemolymph and that most of phospholipids and triacylglycerols remained associated with the midgut. The metabolism of free fatty acids in Rhodnius prolixus females is discussed in the context of major biological events that follow a blood meal such as digestion and oogenesis.
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Affiliation(s)
- G C Atella
- Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, RJ, Brasil
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20
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Pereira-Filho ER, Arruda MA. Mechanised flow system for on-line microwave digestion of food samples with off-line catalytic spectrophotometric determination of cobalt at ng l-1 levels. Analyst 1999; 124:1873-7. [PMID: 10746313 DOI: 10.1039/a905157k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [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: 11/21/2022]
Abstract
A mechanised system for on-line slurry food sample digestion was developed and an off-line cobalt determination was performed. The stabilised slurry sample was introduced into an air carrier stream until reaching the digestion coils located inside a household microwave oven. Software written in Visual Basic 3.0 was developed to permit the transport of the slurry samples and the programming of the microwave oven and also the control of the mineralization valve. The proposed system was optimized for determination of cobalt in certified samples such as mussels, bovine liver and fish and also uncertified fish samples. The digestion parameters were established as 3 mol l-1 HNO3 for mussels, 3 mol l-1 HNO3 plus 0.16% v/v H2O2 for bovine liver and 12 mol l-1 HNO3 for fish employing maximum power for 5 min of microwave actuation. In the subsequent spectrophotometric method for the catalytic determination of cobalt, the Tiron and hydrogen peroxide concentrations were 1.8 x 10(-3) and 3.0 x 10(-4) mol l-1, respectively, and the sample residence time was 300 s as determined by an optimisation process. The proposed method features a linear range from 10 to 200 ng l-1 Co (r > 0.996) with detection and quantification limits of 1.7 and 5.5 ng l-1 Co, respectively. The precision, expressed as RSD, was 2.4% (n = 12) for repeatability and 5.2% (n = 10) for reproducibility and the accuracy of the proposed method was assessed by using certified samples and an alternative technique (ETAAS).
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Affiliation(s)
- E R Pereira-Filho
- Department of Analytical Chemistry, State University of Campinas UNICAMP, SP, Brazil
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21
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Fierro IM, Nascimento-DaSilva V, Arruda MA, Freitas MS, Plotkowski MC, Cunha FQ, Barja-Fidalgo C. Induction of NOS in rat blood PMN in vivo and in vitro: modulation by tyrosine kinase and involvement in bactericidal activity. J Leukoc Biol 1999; 65:508-14. [PMID: 10204580 DOI: 10.1002/jlb.65.4.508] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [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: 11/05/2022] Open
Abstract
Intravenous administration of lipopolysaccharide (LPS) to rats increased the production of nitric oxide (NO) metabolites (NOx) by blood polymorphonuclear neutrophils (PMN) in vitro. Both dexamethasone and L-NMMA, added in vitro to neutrophil cultures, inhibited the production of NO. On the other hand, the production of NO was not affected by the treatment, in vivo or in vitro, with different inhibitors of cyclooxygenase or 5-lipoxygenase or with a platelet-activating factor (PAF) antagonist. The incubation of blood PMN from normal rats in vitro with neutrophil activators (PAF, leukotriene B4, and interleukin-8) and different cytokines [interleukin-1, tumor necrosis factor alpha, and interferon-gamma (IFN-gamma)] showed that only IFN-gamma was able to induce the production of high amounts of NO. This induction was directly correlated with the expression of iNOS and an increase in in the enzyme activity in blood PMN. The tyrosine kinase inhibitor genistein inhibited NO production induced by IFN-gamma, suggesting that the signal transduction pathway leading to NOS induction in rat PMN involves phosphorylation by tyrosine kinase. We also showed that NO produced by IFN-gamma activated rat blood PMN involved in the killing of Pseudomonas aeruginosa.
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Affiliation(s)
- I M Fierro
- Departamento de Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brazil
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22
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Bordini CA, Arruda MA, Ciciarelli M, Daripa M, Martins Coelho J, Speciali JG. Cluster headache: report of seven cases in three families. Funct Neurol 1997; 12:277-82. [PMID: 9439945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report here 7 patients with episodic cluster headache belonging to three families. During follow-up, we investigated the occurrence of migraine and other disorders in the patients and their relatives. In two of the three families we recorded the occurrence of migraine and in one of these the presence of chronic daily headache, tension headache, essential tremor and cyclic depression. In the third family we detected the occurrence of systemic arterial hypertension in the father and childhood hyperkinesia in the son. We discuss the possible relations between these diseases, especially between migraine and cluster headache, and suggest a better investigation of cluster headache co-morbidity since such a study may help to further understanding of the physiopathology of the disorder.
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Affiliation(s)
- C A Bordini
- Department of Neurology, Psychiatry and Medical Psychology, Ribeirão Preto School of Medicine, University of São Paulo, Brazil
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Bordini CA, Arruda MA, Ciciarelli MC, Speciali JG. Propranolol vs flunarizine vs flunarizine plus propranolol in migraine without aura prophylaxis. A double-blind trial. Arq Neuropsiquiatr 1997; 55:536-41. [PMID: 9629401 DOI: 10.1590/s0004-282x1997000400003] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fourty-five migraine without aura patients underwent a parallel double-blind trial aiming the comparison of the effects of propranolol 60 mg/day to flunarizine 10 mg/day and to propranolol 60 mg/day plus flunarizine 10 mg/day simultaneously. There were 3 groups, each one with 15 patients. After a 20-day-baseline period, each group received one kind of treatment during 120 days. Migraine index on propranolol was 23.4*, on flunarizine 18.7* and on both drugs 14.4*, mean frequency of attacks on propranolol was 1.26**, on flunarizine 1.2** and on both drugs 1.13** (*p < 0.05, **p < 0.01 compared to baseline) and global evaluation was reduced with all forms of treatment. It was not found statistical differences between groups, nevertheless there was a trend in the group using two drugs reaching lower values in migraine index, frequency of attacks and global evaluation. In individuals using flunarizine (alone or associated with propranolol) the therapeutic effect was largely maintained up to 45 days after drug withdrawal.
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Affiliation(s)
- C A Bordini
- Departamento de Neurologia, Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo (USP), Brasil
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Abstract
This work was conducted in order to develop a sensitive, precise method for the direct determination of aluminium in dairy products without sample pre-treatment. For this purpose, various chemical modifiers and thermal programmes for an electrothermal atomic absorption spectrometer were assessed. Different dry and wet sample pre-treatments were investigated in order to test the applicability of the method to the direct determination of aluminium in the matrices. Aluminium adsorption or leaching in various milk storage materials was also investigated. The proposed method allows the determination of aluminium in the range 5-50 micrograms l-1 and a detection limit of 0.32 micrograms l-1 for aluminium. The precision achieved, expressed as the relative standard deviation, was 5.6% for within-run assays (repeatability) and 12.7% for between-run assays (reproducibility). Various types of commercially available milk (skim, low fat and whole) and milkshake (marketed in different packages) were analysed after dilution to 1 + 3 (v/v) with 0.2% HNO3. Processing whole milk for drinking slightly decreases its aluminium content, but heating in aluminium vessels also slightly increases its content. The reliability of the entire procedure was confirmed by an analysis performed on a Standard Reference Material.
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Affiliation(s)
- M A Arruda
- Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Spain
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25
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Maffei HV, Arruda MA, E Silva CR, Habermann MC, Zuliani A. [Congenital duodenal obstruction: report of an anatomo-clinical case with anomalous evolution]. Rev Paul Med 1977; 90:32-4. [PMID: 918493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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