1
|
Ramirez JA, Jiménez MC, Ospina V, Rivera BS, Fiorentino S, Barreto A, Restrepo LM. The secretome from human-derived mesenchymal stem cells augments the activity of antitumor plant extracts in vitro. Histochem Cell Biol 2024; 161:409-421. [PMID: 38402366 PMCID: PMC11045572 DOI: 10.1007/s00418-024-02265-1] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/02/2024] [Indexed: 02/26/2024]
Abstract
Cancer is understood as a multifactorial disease that involve multiple cell types and phenotypes in the tumor microenvironment (TME). The components of the TME can interact directly or via soluble factors (cytokines, chemokines, growth factors, extracellular vesicles, etc.). Among the cells composing the TME, mesenchymal stem cells (MSCs) appear as a population with debated properties since it has been seen that they can both promote or attenuate tumor progression. For various authors, the main mechanism of interaction of MSCs is through their secretome, the set of molecules secreted into the extracellular milieu, recruiting, and influencing the behavior of other cells in inflammatory environments where they normally reside, such as wounds and tumors. Natural products have been studied as possible cancer treatments, appealing to synergisms between the molecules in their composition; thus, extracts obtained from Petiveria alliacea (Anamu-SC) and Caesalpinia spinosa (P2Et) have been produced and studied previously on different models, showing promising results. The effect of plant extracts on the MSC secretome has been poorly studied, especially in the context of the TME. Here, we studied the effect of Anamu-SC and P2Et extracts in the human adipose-derived MSC (hAMSC)-tumor cell interaction as a TME model. We also investigated the influence of the hAMSC secretome, in combination with these natural products, on tumor cell hallmarks such as viability, clonogenicity, and migration. In addition, hAMSC gene expression and protein synthesis were evaluated for some key factors in tumor progression in the presence of the extracts by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and Multiplex, respectively. It was found that the presence of the hAMSC secretome did not affect the cytotoxic or clonogenicity-reducing activities of the natural extracts on cancer cells, and even this secretome can inhibit the migration of these tumor cells, in addition to the fact that the profile of molecules can be modified by natural products. Overall, our findings demonstrate that hAMSC secretome participation in TME interactions can favor the antitumor activities of natural products.
Collapse
Affiliation(s)
- J A Ramirez
- Grupo Ingeniería de Tejidos y Terapías Celulares, Facultad de Medicina, Universidad de Antioquia, Carrera 51 A No 62-42, Medellín, Colombia
| | - M C Jiménez
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Cra 7 No 40-62, Bogotá, Colombia
| | - V Ospina
- Grupo Ingeniería de Tejidos y Terapías Celulares, Facultad de Medicina, Universidad de Antioquia, Carrera 51 A No 62-42, Medellín, Colombia
| | - B S Rivera
- Grupo Ingeniería de Tejidos y Terapías Celulares, Facultad de Medicina, Universidad de Antioquia, Carrera 51 A No 62-42, Medellín, Colombia
| | - S Fiorentino
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Cra 7 No 40-62, Bogotá, Colombia
| | - A Barreto
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Cra 7 No 40-62, Bogotá, Colombia.
| | - L M Restrepo
- Grupo Ingeniería de Tejidos y Terapías Celulares, Facultad de Medicina, Universidad de Antioquia, Carrera 51 A No 62-42, Medellín, Colombia
| |
Collapse
|
2
|
Brandts I, Solà R, Martins MA, Tvarijonaviciute A, Barreto A, Teles M, Oliveira M. A baseline study on the impact of nanoplastics on the portals of entry of xenobiotics in fish. Mar Pollut Bull 2021; 173:113018. [PMID: 34653883 DOI: 10.1016/j.marpolbul.2021.113018] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 09/23/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Mediterranean waters are particularly vulnerable to plastic pollution, with plastic particles concentrations comparable to those found in oceanic gyres. This work aimed to assess the impact of polymethylmethacrylate nanoplastics (PMMA-NPs) on the most important mucosal barriers of the gilthead seabream (Sparus aurata), a highly consumed fish species in the Mediterranean area. Fish were waterborne exposed to NPs (0.001-10 mg/L) for 24 and 96 h, and biochemical parameters associated with oxidative status (total oxidative status and total antioxidant capacity) and immune function (adenosine deaminase, ADA, acetylcholinesterase activity, AChE, and esterase activity, EA) were assessed in gills, intestine, and skin. In intestine, PMMA-NPs led to oxidative status alterations and decreased ADA and EA. In gills, PMMA-NPs induced EA decrease and AChE activity increase. Total protein values were significantly increased in skin. Overall, more alterations were observed in intestine, suggesting it may be one of the most affected tissues by exposure to NPs.
Collapse
Affiliation(s)
- I Brandts
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - R Solà
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - M A Martins
- Department of Physics & CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - A Tvarijonaviciute
- Interdisciplinary Laboratory of Clinical Analysis INTERLAB-UMU, Regional Campus of International Excellence Mare Nostrum, University of Murcia, Espinardo, Murcia 30100, Spain
| | - A Barreto
- Centre for Environmental and Marine Studies (CESAM), Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - M Teles
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.
| | - M Oliveira
- Centre for Environmental and Marine Studies (CESAM), Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
3
|
Brandts I, Barría C, Martins MA, Franco-Martínez L, Barreto A, Tvarijonaviciute A, Tort L, Oliveira M, Teles M. Waterborne exposure of gilthead seabream (Sparus aurata) to polymethylmethacrylate nanoplastics causes effects at cellular and molecular levels. J Hazard Mater 2021; 403:123590. [PMID: 32795822 DOI: 10.1016/j.jhazmat.2020.123590] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 07/22/2020] [Accepted: 07/26/2020] [Indexed: 06/11/2023]
Abstract
This study evaluated the effect of a short-term exposure to 45 nm polymethylmethacrylate nanoplastics (PMMA-NPs) on the gilthead seabream (Sparus aurata), by assessing biomarkers at different levels of biological organization in liver and plasma. Fish were exposed via water to PMMA-NPs (0, 0.001, 0.01, 0.1, 1 and 10 mg L-1) and sampled after 24 and 96 h. Results showed a general up-regulation of mRNA levels of key genes associated with lipid metabolism (e.g. apolipoprotein A1 and retinoid X receptor). Together with the modulation of the lipid pathway genes we also found a global increase in cholesterol and triglycerides in plasma. Antioxidant-related genes (e.g. glutathione peroxidase 1) were also up-regulated after 24 h of exposure, but their expression levels returned to control afterwards. Total antioxidant capacity (TAC) was increased throughout the experiment, however at 96 h the antioxidant capacity became less efficient, reflected by an increase in the total oxidative status (TOS). Concomitantly, we found an increase in the erythrocytic nuclear abnormalities (ENAs) throughout the trial. Altogether, PMMA-NPs activated the organism's antioxidant defenses and induced alterations in lipid metabolism pathways and genotoxicity in the blood cells of gilthead seabream.
Collapse
Affiliation(s)
- I Brandts
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - C Barría
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - M A Martins
- Department of Physics & CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - L Franco-Martínez
- Interdisciplinary Laboratory of Clinical Analysis INTERLAB-UMU, Regional Campus of International Excellence Mare Nostrum, University of Murcia, Espinardo, Murcia 30100, Spain
| | - A Barreto
- Centre for Environmental and Marine Studies (CESAM), Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - A Tvarijonaviciute
- Interdisciplinary Laboratory of Clinical Analysis INTERLAB-UMU, Regional Campus of International Excellence Mare Nostrum, University of Murcia, Espinardo, Murcia 30100, Spain
| | - L Tort
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - M Oliveira
- Centre for Environmental and Marine Studies (CESAM), Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - M Teles
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.
| |
Collapse
|
4
|
Barreto A, Carvalho A, Silva D, Pinto E, Almeida A, Paíga P, Correira-Sá L, Delerue-Matos C, Trindade T, Soares AMVM, Hylland K, Loureiro S, Oliveira M. Effects of single and combined exposures of gold (nano versus ionic form) and gemfibrozil in a liver organ culture of Sparus aurata. Mar Pollut Bull 2020; 160:111665. [PMID: 33181940 DOI: 10.1016/j.marpolbul.2020.111665] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 08/15/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
In vitro methods have gained rising importance in ecotoxicology due to ethical concerns. The aim of this study was to assess the single and combined in vitro effects of gold, as nanoparticle (AuNPs) and ionic (Au+) form, and the pharmaceutical gemfibrozil (GEM). Sparus aurata liver organ culture was exposed to gold (4 to 7200 μg·L-1), GEM (1.5 to 15,000 μg·L-1) and combination 80 μg·L-1 gold +150 μg·L-1 GEM for 24 h. Endpoints related with antioxidant status, peroxidative/genetic damage were assessed. AuNPs caused more effects than Au+, increasing catalase and glutathione reductase activities and damaging DNA and cellular membranes. Effects were dependent on AuNPs size, coating and concentration. GEM damaged DNA at an environmentally relevant concentration, 1.5 μg·L-1. Overall, the effects of the combined exposures were higher than the predicted, based on single exposures. This study showed that liver culture can be a useful model to study contaminants effects.
Collapse
Affiliation(s)
- A Barreto
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - A Carvalho
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - D Silva
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - E Pinto
- Departamento de Saúde Ambiental, Escola Superior de Saúde, P. Porto. CISA/Centro de Investigação em saúde e Ambiente, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal; LAQV/REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - A Almeida
- LAQV/REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - P Paíga
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - L Correira-Sá
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - C Delerue-Matos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - T Trindade
- Departamento de Química & CICECO - Aveiro Instituto de Materiais, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - A M V M Soares
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316 Oslo, Norway
| | - S Loureiro
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - M Oliveira
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
5
|
Barreto A, Dias A, Duarte B, Pinto E, Almeida A, Trindade T, Soares AMVM, Hylland K, Loureiro S, Oliveira M. Biological effects and bioaccumulation of gold in gilthead seabream (Sparus aurata) - Nano versus ionic form. Sci Total Environ 2020; 716:137026. [PMID: 32036137 DOI: 10.1016/j.scitotenv.2020.137026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/28/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
The question of whether gold (Au) is more toxic as nanoparticles or in its ionic form remains unclear and controversial. The present work aimed to clarify the effects of 96 h exposure to 4, 80 and 1600 μg·L-1 of 7 nm gold nanoparticles (AuNPs) - (citrate coated (cAuNPs) or polyvinylpyrrolidone coated (PVP-AuNPs)) - and ionic Au (iAu) on gilthead seabream (Sparus aurata). Effects at different levels of biological organization (behaviour, neurotransmission, biotransformation, oxidative stress/damage and genotoxicity) were assessed. cAuNPs induced oxidative stress and damage (lipid peroxidation increase), even at 4 μg·L-1, and reduced the ability of S. aurata to swim against a water flow at 1600 μg·L-1. Exposure to cAuNPs induced more adverse effects than exposure to PVP-AuNPs. All tested concentrations of Au (nano or ionic form) induced DNA breaks and cytogenetic damage in erythrocytes of S. aurata. Generally, iAu induced significantly more effects in fish than the nano form, probably associated with the significantly higher accumulation in the fish tissues. No fish mortality was observed following exposure to AuNPs, but mortality was observed in the group exposed to 1600 μg·L-1 of iAu.
Collapse
Affiliation(s)
- A Barreto
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - A Dias
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - B Duarte
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - E Pinto
- LAQV/REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, 4050-313 Porto, Portugal; Department of Environmental Health, School of Health, P.Porto. CISA/Research Center in Environment and Health, 4200-072 Porto, Portugal
| | - A Almeida
- LAQV/REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, 4050-313 Porto, Portugal
| | - T Trindade
- Departamento de Química & CICECO, Aveiro Instituto de Materiais, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - A M V M Soares
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316 Oslo, Norway
| | - S Loureiro
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - M Oliveira
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
6
|
Barreto A, Carvalho A, Campos A, Osório H, Pinto E, Almeida A, Trindade T, Soares AMVM, Hylland K, Loureiro S, Oliveira M. Effects of gold nanoparticles in gilthead seabream-A proteomic approach. Aquat Toxicol 2020; 221:105445. [PMID: 32078886 DOI: 10.1016/j.aquatox.2020.105445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 01/27/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
Despite the widespread use of nanoparticles (NPs), there are still major gaps of knowledge regarding the impact of nanomaterials in the environment and aquatic animals. The present work aimed to study the effects of 7 and 40 nm gold nanoparticles (AuNPs) - citrate and polyvinylpyrrolidone (PVP) coated - on the liver proteome of the estuarine/marine fish gilthead seabream (Sparus aurata). After 96 h, exposure to AuNP elicited alterations on the abundance of 26 proteins, when compared to the control group. AuNPs differentially affected several metabolic pathways in S. aurata liver cells. Among the affected proteins were those related to cytoskeleton and cell structure, gluconeogenesis, amino acids metabolism and several processes related to protein activity (protein synthesis, catabolism, folding and transport). The increased abundance of proteins associated with energy metabolism (ATP synthase subunit beta), stress response (94 kDa glucose-regulated protein) and cytoskeleton structure (actins and tubulins) may represent the first signs of cellular oxidative stress induced by AuNPs. Although higher gold accumulation was found in the liver of S. aurata exposed to 7 nm PVP-AuNPs, the 7 nm cAuNPs were more bioactive, inducing more effects in liver proteome. Gold accumulated more in the spleen than in the other assessed tissues of S. aurata exposed to AuNPs, highlighting its potential role on the elimination of these NPs.
Collapse
Affiliation(s)
- A Barreto
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193, Aveiro, Portugal.
| | - A Carvalho
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| | - A Campos
- CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, 4450-208, Matosinhos, Portugal
| | - H Osório
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal; Instituto de Patologia e Imunologia Molecular da Universidade do Porto, IPATIMUP, Porto, Portugal; Faculdade de Medicina, Universidade do Porto, Portugal
| | - E Pinto
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313, Porto, Portugal; Departamento de Saúde Ambiental, Escola Superior de Saúde, P. Porto. CISA/Centro de Investigação em Saúde e Ambiente, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal
| | - A Almeida
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313, Porto, Portugal
| | - T Trindade
- Departamento de Química & CICECO - Aveiro Instituto de Materiais, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| | - A M V M Soares
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316, Oslo, Norway
| | - S Loureiro
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| | - M Oliveira
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| |
Collapse
|
7
|
Barreto A, Luis LG, Pinto E, Almeida A, Paíga P, Santos LHMLM, Delerue-Matos C, Trindade T, Soares AMVM, Hylland K, Loureiro S, Oliveira M. Genotoxicity of gold nanoparticles in the gilthead seabream (Sparus aurata) after single exposure and combined with the pharmaceutical gemfibrozil. Chemosphere 2019; 220:11-19. [PMID: 30576896 DOI: 10.1016/j.chemosphere.2018.12.090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 12/05/2018] [Accepted: 12/11/2018] [Indexed: 06/09/2023]
Abstract
Due to their diverse applications, gold nanoparticles (AuNPs) are expected to increase of in the environment, although few studies are available on their mode of action in aquatic organisms. The genotoxicity of AuNPs, alone or combined with the human pharmaceutical gemfibrozil (GEM), an environmental contaminant frequently detected in aquatic systems, including in marine ecosystems, was examined using gilthead seabream erythrocytes as a model system. Fish were exposed for 96 h to 4, 80 and 1600 μg L-1 of 40 nm AuNPs with two coatings - citrate or polyvinylpyrrolidone; GEM (150 μg L-1); and a combination of AuNPs and GEM (80 μg L-1 AuNPs + 150 μg L-1 GEM). AuNPs induced DNA damage and increased nuclear abnormalities levels, with coating showing an important role in the toxicity of AuNPs to fish. The combined exposures of AuNPs and GEM produced an antagonistic response, with observed toxic effects in the mixtures being lower than the predicted. The results raise concern about the safety of AuNPs and demonstrate interactions between them and other contaminants.
Collapse
Affiliation(s)
- A Barreto
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - L G Luis
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - E Pinto
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - A Almeida
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - P Paíga
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - L H M L M Santos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal; Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - C Delerue-Matos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - T Trindade
- Departamento de Química & CICECO - Aveiro Instituto de Materiais, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - A M V M Soares
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316 Oslo, Norway
| | - S Loureiro
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - M Oliveira
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
8
|
Barreto A, Luis LG, Pinto E, Almeida A, Paíga P, Santos LHMLM, Delerue-Matos C, Trindade T, Soares AMVM, Hylland K, Loureiro S, Oliveira M. Effects and bioaccumulation of gold nanoparticles in the gilthead seabream (Sparus aurata) - Single and combined exposures with gemfibrozil. Chemosphere 2019; 215:248-260. [PMID: 30317096 DOI: 10.1016/j.chemosphere.2018.09.175] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 09/18/2018] [Accepted: 09/29/2018] [Indexed: 06/08/2023]
Abstract
Gold nanoparticles (AuNPs) are found in a wide range of applications and therefore expected to present increasing levels in the environment. There is however limited knowledge concerning the potential toxicity of AuNPs as well as their combined effects with other pollutants. Hence, the present study aimed to investigate the effects of AuNPs alone and combined with the pharmaceutical gemfibrozil (GEM) on different biological responses (behaviour, neurotransmission, biotransformation and oxidative stress) in one of the most consumed fish in southern Europe, the seabream Sparus aurata. Fish were exposed for 96 h to waterborne 40 nm AuNPs with two coatings - citrate and polyvinylpyrrolidone (PVP), alone or combined with GEM. Antioxidant defences were induced in liver and gills upon both AuNPs exposure. Decreased swimming performance (1600 μg.L-1) and oxidative damage in gills (4 and 80 μg.L-1) were observed following exposure to polyvinylpyrrolidone coated gold nanoparticles (PVP-AuNPs). Generally, accumulation of gold in fish tissues and deleterious effects in S. aurata were higher for PVP-AuNPs than for cAuNPs exposures. Although AuNPs and GEM combined effects in gills were generally low, in liver, they were higher than the predicted. The accumulation and effects of AuNPs showed to be dependent on the size, coating, surface charge and aggregation/agglomeration state of nanoparticles. Additionally, it was tissue' specific and dependent on the presence of other contaminants. Although, gold intake by humans is expected to not exceed the estimated tolerable daily intake, it is highly recommended to keep it on track due to the increasing use of AuNPs.
Collapse
Affiliation(s)
- A Barreto
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - L G Luis
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - E Pinto
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - A Almeida
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - P Paíga
- LAQV/REQUIMTE, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - L H M L M Santos
- LAQV/REQUIMTE, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal; Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - C Delerue-Matos
- LAQV/REQUIMTE, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
| | - T Trindade
- Departamento de Química & CICECO - Aveiro Instituto de Materiais, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - A M V M Soares
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316 Oslo, Norway
| | - S Loureiro
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - M Oliveira
- Departamento de Biologia & CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
9
|
Brandts I, Teles M, Gonçalves AP, Barreto A, Franco-Martinez L, Tvarijonaviciute A, Martins MA, Soares AMVM, Tort L, Oliveira M. Effects of nanoplastics on Mytilus galloprovincialis after individual and combined exposure with carbamazepine. Sci Total Environ 2018; 643:775-784. [PMID: 29958167 DOI: 10.1016/j.scitotenv.2018.06.257] [Citation(s) in RCA: 210] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 05/18/2023]
Abstract
Plastic pollution is a worldwide problem, highlighted by the fact that plastic materials degrade into nano-size particles (<100 nm), potentially becoming more bioavailable as well as a source of entry of other contaminants into organisms. The present study aimed to assess the effects of polystyrene nanoplastics (PS), individually or combined with carbamazepine (Cbz), on the Mediterranean mussel, Mytilus galloprovincialis. For this purpose, mussels were exposed for 96 h to a concentration range of PS (from 0.05 up to 50 mg L-1), to Cbz (6.3 μg L-1) alone and to the mixture of PS + Cbz (0.05 mg L-1+ 6.3 μg L-1). Molecular and biochemical biomarkers were assessed in the digestive glands, gills and haemolymph. The abundance of mRNA in the digestive glands and gills revealed significant alterations in the expression of genes associated with biotransformation, DNA repair, cell stress-response and innate immunity. Combined exposure of PS + Cbz induced significant downregulation in gene expression (e.g., hsp70) when compared to individual exposure. Total oxidant status increased in digestive glands after exposure to 0.5 mg L-1 PS. Moreover, increased total antioxidant capacity and esterase activity were observed for PS 50 mg L-1, in digestive glands and gills, respectively. The PS induced effects on neurotransmission, measured as inhibition of cholinesterase activity in haemolymph. Genotoxicity was found in haemocytes after exposure to PS, Cbz and their mixture. Moreover, lipid peroxidation was observed for 0.05 mg L-1 PS exposure, showing that nanoplastics can induce oxidative damage. The present study demonstrated that PS, even at low concentrations, led to alterations on the assessed mussels' endpoints.
Collapse
Affiliation(s)
- I Brandts
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - M Teles
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, Terminal de Cruzeiros, Portugal.
| | - A P Gonçalves
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - A Barreto
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - L Franco-Martinez
- Interdisciplinary Laboratory of Clinical Analysis Interlab-UMU, Regional Campus of International Excellence Mare Nostrum, University of Murcia, Espinardo, Murcia 30100, Spain
| | - A Tvarijonaviciute
- Interdisciplinary Laboratory of Clinical Analysis Interlab-UMU, Regional Campus of International Excellence Mare Nostrum, University of Murcia, Espinardo, Murcia 30100, Spain
| | - M A Martins
- Department of Chemistry & CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - A M V M Soares
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - L Tort
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - M Oliveira
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
| |
Collapse
|
10
|
Abstract
Abstract
Background: The brachial plexus is a complex network of nerves that innervates the upper limbs. Variations in brachial plexus are common, as well as its relationships with other anatomical structures, gaining thus clinical and surgical importance. The aim of this study was to report variations in the formation of the trunks of brachial plexus. Material and Methods: Forty upper limbs from 20 human fetuses were used, fixed and kept in 10% formol solution. Fetal age was estimated from the hallux-calcaneus length and ranged from 20 to 37 weeks of gestation, with a mean of25.63 weeks. The plexus were dissected without the aid of optical instruments, and the access route for dissection began 2 cm below the mastoid process, followed the posterior border of the sternocleidomastoid muscle until the medial third of the clavicle, and then went through the deltopectoral groove until the arm. Results: Of the 40 plexuses investigated, 37 (92.5%) had the usual trunk formation, and 3 (7.5%) showed variation in its formation. Among these, in 2 (5%) plexuses of a single fetus, the upper trunk was formed by the C5, C6 and C7 roots, the middle trunk by the C8 root, and the lower trunk by the T1 root, both on left and right sides. In 1 (2.5%) plexus of another fetus, there was the formation of four trunks on the left side: the first trunk was formed by the C4 and C5 roots, the second by the C7 root, the third by the C8 root, and the forth by the T1 root. Conclusion: Studies on variations in brachial plexus should continue to draw the attention of different healthcare professionals who work directly or indirectly with this plexus in their daily routine.
Collapse
Affiliation(s)
- J. Aragão
- Departamento de Medicina, Universidade Tiradentes - UNIT, CEP 49010-390, Aracaju, SE, Brasil
- Departamento de Morfologia/Anatomia, Universidade Federal de Sergipe - UFS, CEP 49100-000, Aacaju, SE, Brasil
| | - L. Melo
- Departamento de Morfologia/Anatomia, Universidade Federal de Sergipe - UFS, CEP 49100-000, Aacaju, SE, Brasil
| | - A. Barreto
- Departamento de Morfologia/Anatomia, Universidade Federal de Sergipe - UFS, CEP 49100-000, Aacaju, SE, Brasil
| | - A. Da Silva Leal
- Departamento de Morfologia/Anatomia, Universidade Federal de Sergipe - UFS, CEP 49100-000, Aacaju, SE, Brasil
| | - F. Reis
- Departamento de Medicina, Universidade Tiradentes - UNIT, CEP 49010-390, Aracaju, SE, Brasil
| |
Collapse
|
11
|
Barreto A, Luis LG, Paíga P, Santos LHMLM, Delerue-Matos C, Soares AMVM, Hylland K, Loureiro S, Oliveira M. A multibiomarker approach highlights effects induced by the human pharmaceutical gemfibrozil to gilthead seabream Sparus aurata. Aquat Toxicol 2018; 200:266-274. [PMID: 29807214 DOI: 10.1016/j.aquatox.2018.05.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/14/2018] [Accepted: 05/16/2018] [Indexed: 06/08/2023]
Abstract
Lipid regulators are among the most prescribed human pharmaceuticals worldwide. Gemfibrozil, which belongs to this class of pharmaceuticals, is one of the most frequently encountered in the aquatic environment. However, there is limited information concerning the mechanisms involved in gemfibrozil effects to aquatic organisms, particularly to marine organisms. Based on this knowledge gap, the current study aimed to assess biochemical and behavioral effects following a sublethal exposure to gemfibrozil (1.5, 15, 150, 1500 and 15,000 μg L-1) in the estuarine/marine fish Sparus aurata. After the exposure to 1.5 μg L-1 of gemfibrozil, fish had reduced ability to swim against a water flow and increased lipid peroxidation in the liver. At concentrations between 15-15,000 μg L-1, the activities of some enzymes involved in antioxidant defense were induced, appearing to be sufficient to prevent oxidative damage. Depending on the organ, different responses to gemfibrozil were displayed, with enzymes like catalase being more stimulated in gills, whereas glutathione peroxidase was more activated in liver. Although there were no obvious concentration-response relationships, the integrated biomarker response version 2 (IBRv2) analysis revealed that the highest concentrations of gemfibrozil (between 150-15,000 μg L-1) caused more alterations. All the tested concentrations of gemfibrozil induced effects in S. aurata, in terms of behavior and/or oxidative stress responses. Oxidative damage was found at a concentration that is considered environmentally relevant, suggesting a potential of this pharmaceutical to impact fish populations.
Collapse
Affiliation(s)
- A Barreto
- Department of Biology & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal.
| | - L G Luis
- Department of Biology & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - P Paíga
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072, Porto, Portugal
| | - L H M L M Santos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072, Porto, Portugal; Present affiliation: Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003, Girona, Spain
| | - C Delerue-Matos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072, Porto, Portugal
| | - A M V M Soares
- Department of Biology & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - K Hylland
- Department of Biosciences, University of Oslo, PO Box 1066, N-0316, Oslo, Norway
| | - S Loureiro
- Department of Biology & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - M Oliveira
- Department of Biology & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| |
Collapse
|
12
|
Mejía C, Barreto E, Pardo M, Leal E, Pérez R, Jaramillo L, Barreto A, Rodríguez-Pardo V. Three-dimensional tissue culture system by the magnetic levitation method for the study of the hematopoietic stem cells microenvironment. Cytotherapy 2018. [DOI: 10.1016/j.jcyt.2018.02.239] [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: 10/17/2022]
|
13
|
Barreto A, Luis L, Soares A, Paíga P, Santos L, Delerue-Matos C, Hylland K, Loureiro S, Oliveira M. Genotoxicity of gemfibrozil in the gilthead seabream ( Sparus aurata ). Mutation Research/Genetic Toxicology and Environmental Mutagenesis 2017; 821:36-42. [DOI: 10.1016/j.mrgentox.2017.05.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 05/24/2017] [Accepted: 05/25/2017] [Indexed: 01/26/2023]
|
14
|
Costa F, Teles P, Nogueira A, Barreto A, Santos A, Carvalho A, Martins B, Oliveira C, Gaspar C, Barros C, Neves D, Costa D, Rodrigues E, Godinho F, Alves F, Cardoso G, Cantinho G, Conde I, Vale J, Santos J, Isidoro J, Pereira J, Salgado L, Rézio M, Vieira M, Simãozinho P, Almeida P, Castro R, Parafita R, Pintão S, Lúcio T, Reis T, Vaz P. Estimation of the collective ionizing dose in the Portuguese population for the years 2011 and 2012, due to nuclear medicine exams. Rev Esp Med Nucl Imagen Mol 2015; 34:1-8. [DOI: 10.1016/j.remn.2014.03.009] [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] [Received: 01/21/2014] [Revised: 03/28/2014] [Accepted: 03/31/2014] [Indexed: 10/25/2022]
|
15
|
Costa F, Teles P, Nogueira A, Barreto A, Santos A, Carvalho A, Martins B, Oliveira C, Gaspar C, Barros C, Neves D, Costa D, Rodrigues E, Godinho F, Alves F, Cardoso G, Cantinho G, Conde I, Vale J, Santos J, Isidoro J, Pereira J, Salgado L, Rézio M, Vieira M, Simãozinho P, Almeida P, Castro R, Parafita R, Pintão S, Lúcio T, Reis T, Vaz P. Estimation of the collective ionizing dose in the Portuguese population for the years 2011 and 2012, due to nuclear medicine exams. Rev Esp Med Nucl Imagen Mol 2015. [DOI: 10.1016/j.remnie.2014.12.009] [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: 10/24/2022]
|
16
|
Guzman AM, Goryawala M, Wang J, Barreto A, Andrian J, Rishe N, Adjouadi M. Thermal Imaging as a Biometrics Approach to Facial Signature Authentication. IEEE J Biomed Health Inform 2013; 17:214-22. [PMID: 22801524 DOI: 10.1109/titb.2012.2207729] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
17
|
Bento J, Teles P, Neves M, Santos AI, Cardoso G, Barreto A, Alves F, Guerreiro C, Rodrigues A, Santos JAM, Capelo C, Parafita R, Martins B. Study of nuclear medicine practices in Portugal from an internal dosimetry perspective. Radiat Prot Dosimetry 2012; 149:438-443. [PMID: 21795254 DOI: 10.1093/rpd/ncr319] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nuclear medicine practices involve the handling of a wide range of pharmaceuticals labelled with different radionuclides, for diagnostic and therapeutic purposes. This work intends to evaluate the potential risks of internal contamination of nuclear medicine staff in several Portuguese nuclear medicine services and to conclude about the requirement of a routine internal monitoring. A methodology proposed by the International Atomic Energy Agency (IAEA), providing a set of criteria to determine the need, or not, for an internal monitoring programme, was applied. The evaluation of the risk of internal contaminations in a given set of working conditions is based on the type and amount of radionuclides being handled, as well as the safety conditions with which they are manipulated. The application of the IAEA criteria showed that 73.1% of all the workers included in this study should be integrated in a routine monitoring programme for internal contaminations; more specifically, 100% of workers performing radioimmunoassay techniques should be monitored. This study suggests that a routine monitoring programme for internal exposures should be implemented in Portugal for most nuclear medicine workers.
Collapse
Affiliation(s)
- J Bento
- Instituto Tecnológico e Nuclear, Sacavém, Portugal.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Kramer L, Barreto A, Bui TT, Brod S, Jemelka J, Ton K, Cohen A, Lindsey J, Nelson F, Narayana P, Wolinsky J. Prospective, Case-Control Study of CCSVI with Imaging-Blinded Assessment: Progress Report Correlating Magnetic Resonance Venography with Neurosonography (S10.006). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s10.006] [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: 11/15/2022] Open
|
19
|
Nguyen C, Jones E, Kuo E, Peng H, Pandurengan R, Sangha N, Mir O, Alderazi Y, Wu TC, Misra V, Lopez G, Barreto A, Savitz S, Grotta J, Gonzales N. Off-Label Use of Intravenous t-PA May Be Safe in Select Patients (P02.199). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p02.199] [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: 11/15/2022] Open
|
20
|
Barreto A, Brod S, Bui TT, Jamelka J, Kramer L, Ton K, Cohen A, Lindsey J, Nelson F, Narayana P, Wolinsky J. A Study of CCSVI with Imaging-Blinded Assessment: Neurosonography Update (S10.005). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s10.005] [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: 11/15/2022] Open
|
21
|
Goryawala M, Guillen MR, Cabrerizo M, Barreto A, Gulec S, Barot TC, Suthar RR, Bhatt RN, Mcgoron A, Adjouadi M. A 3-D Liver Segmentation Method with Parallel Computing for Selective Internal Radiation Therapy. ACTA ACUST UNITED AC 2012; 16:62-9. [DOI: 10.1109/titb.2011.2171191] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
22
|
Merino P, Mateos C, Gómez De Liaño P, Franco G, Nieva I, Barreto A. [Horizontal sensory strabismus: characteristics and treatment results]. Arch Soc Esp Oftalmol 2011; 86:358-362. [PMID: 22040642 DOI: 10.1016/j.oftal.2011.05.028] [Citation(s) in RCA: 12] [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] [Received: 10/27/2010] [Revised: 03/30/2011] [Accepted: 05/25/2011] [Indexed: 05/31/2023]
Abstract
PURPOSE To study the types of horizontal sensory strabismus, their causes, and treatment outcomes. METHODS A retrospective analysis of 44 patients with horizontal sensory strabismus who were treated from 2002 to 2007. Patients whose worse eye vision was inferior or equal to 0.2 were included. The deviation angle in primary position, causes, type of treatment, and pre-operative or post-operative diplopia were studied. A good result was considered if the final deviation was less than 10 prism diopters (pd). RESULTS Of the patients studied, 63.6% had exotropia and the 36.4% had esotropia. The visual acuity was between 0.1 and no light perception in 75% of patients. The causes responsible for low vision were congenital in 28, and acquired in 16 cases. The mean deviation was 46.7 pd. Diplopia was present in 5 cases, which were resolved with surgical treatment in 3 of them. The eye with reduced vision was operated on in 37 patients, both eyes in 6 cases, and botulinum toxin was injected in 1 case. The final outcome was successful in 90.6% of the cases which were surgically treated. The mean follow up was 31.84 months. CONCLUSIONS There were twice as many exotropias as esotropias. Strabismus surgery of the amblyopic eye shows excellent results without the need of new operations. There were no new diplopia cases.
Collapse
Affiliation(s)
- P Merino
- Sección de Motilidad Ocular, Departamento de Oftalmología, HGU Gregorio Marañón, Madrid, España.
| | | | | | | | | | | |
Collapse
|
23
|
Chernyshev OY, Martin-Schild S, Albright KC, Barreto A, Misra V, Acosta I, Grotta JC, Savitz SI. Safety of tPA in stroke mimics and neuroimaging-negative cerebral ischemia. Neurology 2010; 74:1340-5. [PMID: 20335564 DOI: 10.1212/wnl.0b013e3181dad5a6] [Citation(s) in RCA: 212] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Patients with acute neurologic symptoms may have other causes simulating ischemic stroke, called stroke mimics (SM), but they may also have averted strokes that do not appear as infarcts on neuroimaging, which we call neuroimaging-negative cerebral ischemia (NNCI). We determined the safety and outcome of IV thrombolysis within 3 hours of symptom onset in patients with SM and NNCI. METHODS Patients treated with IV tissue plasminogen activator (tPA) within 3 hours of symptom onset were identified from our stroke registry from June 2004 to October 2008. We collected admission NIH Stroke Scale (NIHSS) score, modified Rankin score (mRS), length of stay (LOS), symptomatic intracerebral hemorrhage (sICH), and discharge diagnosis. RESULTS Among 512 treated patients, 21% were found not to have an infarct on follow-up imaging. In the SM group (14%), average age was 55 years, median admission NIHSS was 7, median discharge NIHSS was 0, median LOS was 3 days, and there were no instances of sICH. The most common etiologies were seizure, complicated migraine, and conversion disorder. In the NNCI group (7%), average age was 61 years, median admission NIHSS was 7, median discharge NIHSS was 0, median LOS was 3 days, and there were no instances of sICH. Nearly all SM (87%) and NNCI (91%) patients were functionally independent on discharge (mRS 0-1). CONCLUSIONS Our data support the safety of administering IV tissue plasminogen activator to patients with suspected acute cerebral ischemia within 3 hours of symptom onset, even when the diagnosis ultimately is found not to be stroke or imaging does not show an infarct.
Collapse
Affiliation(s)
- O Y Chernyshev
- Department of Neurology, University of Texas Medical School at Houston, Houston, TX 77030, USA
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Nogueira R, Liebeskind D, Gupta R, Levy E, Rai A, Barreto A, Zaidat O, Janjua N, Abou-Chebl A, Yavagal D, Rymer M, Baxter B, Furlan A, Jovin T. 030 Preliminary data for the dawn trial (DWI/PWI and CTP assessment in the triage of wake-up and late presenting strokes undergoing neurointervention): imaging based endovascular therapy for proximal anterior circulation occlusions beyond 8 h from last seen well in 193 stroke patients. J Neurointerv Surg 2009. [DOI: 10.1136/jnis.2009.001016d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
25
|
Zhai J, Barreto A. Stress detection in computer users based on digital signal processing of noninvasive physiological variables. Conf Proc IEEE Eng Med Biol Soc 2008; 2006:1355-8. [PMID: 17946041 DOI: 10.1109/iembs.2006.259421] [Citation(s) in RCA: 145] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A stress detection system is developed based on the physiological signals monitored by non-invasive and non-intrusive sensors. The development of this emotion recognition system involved three stages: experiment setup for physiological sensing, signal preprocessing for the extraction of affective features and affective recognition using a learning system. Four signals: galvanic skin response (GSR), blood volume pulse (BVP), pupil diameter (PD) and skin temperature (ST) are monitored and analyzed to differentiate affective states in a computer user. A support vector machine is used to perform the supervised classification of affective states between "stress" and "relaxed". Results indicate that the physiological signals monitored do, in fact, have a strong correlation with the changes in emotional state of our experimental subjects when stress stimuli are applied to the interaction environment. It was also found that the pupil diameter was the most significant affective state indicator, compared to the other three physiological signals monitored.
Collapse
Affiliation(s)
- Jing Zhai
- Digital Signal Processing Laboratory, Florida International University, 10555 W. Flagler Street, Miami, FL 33174, USA.
| | | |
Collapse
|
26
|
Rodriguez B, Beatty R, Belli A, Barreto A, Palacios X, Marin F, Harris E. Atypical cutaneous leishmaniasis cases display elevated antigen-induced interleukin-10. Parasite Immunol 2007; 29:277-82. [PMID: 17518946 DOI: 10.1111/j.1365-3024.2007.00944.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In humans, Leishmania chagasi parasites can produce subclinical infections, atypical cutaneous leishmaniasis (ACL) and visceral leshmaniasis that is potentially fatal if not treated in a timely fashion. L. chagasi parasites that cause both ACL and visceral disease appear to be genetically similar, which suggests that host factors such as the immune response play an important role in controlling infection. We evaluated the immunologic response in ACL using peripheral blood mononuclear cells (PBMCs) of 37 subjects divided into three groups: (i) active ACL cases, (ii) asymptomatic cases and (iii) persons with no history of Leishmania infection. The supernatants of stimulated PBMCs were analysed for production of IL-10, IFN-gamma and IL-2. Robust production of IL-10 in response to Leishmania stimulation was observed in active ACL cases, compared to low levels in asymptomatic cases and negative controls. Serum IgE levels, measured by ELISA, were not significantly different among the three groups. In addition, ACL cases displayed depressed levels of all cytokines in response to mitogen. Thus, this first characterization of the immune response in ACL suggests a role for IL-10 as well as partial immunosuppression.
Collapse
Affiliation(s)
- B Rodriguez
- Departamento de Parasitología, Centro Nacional de Diagnóstico y Referencia, Ministerio de Salud, Managua, Nicaragua
| | | | | | | | | | | | | |
Collapse
|
27
|
Sanchez A, Gerhardt G, Natal S, Capone D, Espinola A, Costa W, Pires J, Barreto A, Biondi E, Larouzé B. Prevalence of pulmonary tuberculosis and comparative evaluation of screening strategies in a Brazilian prison. Int J Tuberc Lung Dis 2005; 9:633-9. [PMID: 15971390] [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: 05/03/2023] Open
Abstract
SETTING A prison (1171 male inmates) in Rio de Janeiro, Brazil. OBJECTIVES To determine the prevalence of active pulmonary tuberculosis (TB) and to assess the performance of several screening strategies. DESIGN In a cross-sectional study, all inmates underwent chest radiographic screening. Subjects with abnormal findings underwent sputum smear examination and sputum culture. Taking this strategy as the reference, we assessed three targeted screening strategies to identify TB suspects: Strategy 1: cough >3 weeks; Strategy 2: WHO score > or = 5; Strategy 3: presence of at least one potentially TB-related symptom. RESULTS The prevalence of TB cases was 4.6% (48/1052) and 2.7% for definite TB cases. If TB suspects identified by targeted screening had sputum smear examination alone, 37 (86.0%) of the 43 cases would have been missed by Strategy 1, 34/43 (79.1%) by Strategy 2 and 34/43 (79.1%) by Strategy 3. If TB suspects had both sputum smear examination and, for smear-negative subjects, chest radiography, respectively 28/43 (65.1%), 18/43 (41.9%) and 13/43 (30.2%) of cases would have been missed. CONCLUSION All three targeted screening strategies were unreliable. Given the importance of early TB diagnosis in overcrowded and highly endemic settings, routine radiography-based screening may be warranted.
Collapse
Affiliation(s)
- A Sanchez
- Secretaria de Administração Penitenciária do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Sanchez A, Gerhardt G, Natal S, Capone D, Espinola A, Costa W, Pires J, Barreto A, Biondi E, Larouze B. P12-5 Quelle stratégie choisir pour dépister la tuberculose en milieu carcéral hyperendémique (État de Rio de Janeiro, Brésil) ? Rev Epidemiol Sante Publique 2004. [DOI: 10.1016/s0398-7620(04)99352-2] [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: 10/14/2022] Open
|
29
|
Abacassamo F, Enosse S, Aponte JJ, Gómez-Olivé FX, Quintó L, Mabunda S, Barreto A, Magnussen P, Rønn AM, Thompson R, Alonso PL. Efficacy of chloroquine, amodiaquine, sulphadoxine-pyrimethamine and combination therapy with artesunate in Mozambican children with non-complicated malaria. Trop Med Int Health 2004; 9:200-8. [PMID: 15040556 DOI: 10.1046/j.1365-3156.2003.01182.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [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: 11/20/2022]
Abstract
This paper reports a two-phase study in Manhiça district, Mozambique: first we assessed the clinical efficacy and parasitological response of Plasmodium falciparum to chloroquine (CQ), sulphadoxine-pyrimethamine (SP) and amodiaquine (AQ), then we tested the safety and efficacy in the treatment of uncomplicated malaria, of three combinations: AQ + SP, artesunate (AR) + SP and AQ + AR. Based on the WHO (1996, WHO/MAL/96.1077) in vivo protocol, we conducted two open, randomized, clinical trials. Children aged 6-59 months with axillary body temperature > or = 37.5 degrees C and non-complicated malaria were randomly allocated to treatment groups and followed up for 21 days (first and second trial) and 28 days (first trial). The therapeutic efficacy of AQ (91.6%) was better than that of SP (82.7%) and CQ (47.1%). After 14 days, 69% of the strains were parasitologically resistant to CQ, 21.4% to SP and 26% to AQ. Co-administration of AQ + SP, AR + SP and AQ + AR was safe and had 100% clinical efficacy at 14-day follow-up. The combination therapies affected rapid fever clearance time and reduced the incidence of gametocytaemia during follow-up.
Collapse
Affiliation(s)
- F Abacassamo
- Centro de Investigação em Saúde da Manhiça, Manhiça, Mozambique.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
De Hulsters B, Barreto A, Bastos R, Noya A, Folgosa E, Fransen L. Geographical focusing: an intervention to address increased risk for sexually transmitted diseases during repatriation and resettlement in post-war Mozambique. Sex Transm Infect 2003; 79:77. [PMID: 12576628 PMCID: PMC1744599 DOI: 10.1136/sti.79.1.77] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
31
|
Castellsagué X, Menéndez C, Loscertales MP, Kornegay JR, dos Santos F, Gómez-Olivé FX, Lloveras B, Abarca N, Vaz N, Barreto A, Bosch FX, Alonso P. Human papillomavirus genotypes in rural Mozambique. Lancet 2001; 358:1429-30. [PMID: 11705494 DOI: 10.1016/s0140-6736(01)06523-0] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We studied the genotype distribution of cervical human papillomavirus (HPV) infections in an age-stratified sample of 262 women in Mozambique using the PGMYO9-PGMY11 primer system in a reverse line-blot strip-based assay with high sensitivity in type-specific amplification. Despite the low precision of the estimates, we found that HPV-16 was not the dominant type. Instead, HPV 35 was the most commonly identified genotype among HPV-positive women (16/96 [17%]) and women with cervical neoplasia (7/23 [30%]). Certain genotypes might have been under-detected in previous studies, and type-specific HPV distributions might vary across populations. Therefore, the estimated proportion of cervical neoplasia that could be prevented by an HPV-16-based vaccine could be lower than expected.
Collapse
|
32
|
Mayor AG, Gómez-Olivé X, Aponte JJ, Casimiro S, Mabunda S, Dgedge M, Barreto A, Alonso PL. Prevalence of the K76T mutation in the putative Plasmodium falciparum chloroquine resistance transporter (pfcrt) gene and its relation to chloroquine resistance in Mozambique. J Infect Dis 2001; 183:1413-6. [PMID: 11294676 DOI: 10.1086/319856] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [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: 10/20/2000] [Revised: 02/05/2001] [Indexed: 11/03/2022] Open
Abstract
K76T, a mutation in the Plasmodium falciparum chloroquine (CQ) resistance transporter protein, has been implicated in resistance to CQ. A modified 14-day in vivo test to estimate the CQ resistance level was done in southern Mozambique: 21 (42%) of 50 subjects who completed the follow-up were CQ susceptible. Use of msa2-restriction fragment length polymorphism (RFLP) genotyping to differentiate new from recrudescent infections made little difference in the estimated prevalence of resistance. The K76T mutation prevalence was estimated by RFLP-polymerase chain reaction and sequencing, and its relation to parasitological CQ resistance was explored on day 0 samples: 51 of 56 pretreatment samples presented the T76 codon, and it was present in 100% of children with parasitological resistance. T76 also was present in 18 of 23 subjects in whom the infection resolved after CQ treatment. These findings show a high prevalence of the K76T mutation among wild isolates but also suggest additional factors responsible for CQ resistance.
Collapse
Affiliation(s)
- A G Mayor
- Centro de Investigaçao em Saúde da Manhiça, Dirección Nacional de Saúde, Ministerio de Saúde, Maputo, Mozambique.
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Pontes L, Cordeiro Y, Giongo V, Villas-Boas M, Barreto A, Araújo JR, Silva JL. Pressure-induced formation of inactive triple-shelled rotavirus particles is associated with changes in the spike protein Vp4. J Mol Biol 2001; 307:1171-9. [PMID: 11292333 DOI: 10.1006/jmbi.2001.4512] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Rotaviruses are non-enveloped, triple-shelled particles that cause enteritis in animals and humans. The interactions among the different viral proteins located in the three concentric layers make the rotavirus particle an excellent model for physico-chemical and biological studies of viral assemblage. SA11-4S rotaviruses subjected to high pressure were inactivated by more than five log units. After pressure treatment, the particles were recovered with slight structural changes when compared to the control. Electron microscopy suggested subtle changes in the viral outer layer in some pressurised particles. Fluorescence spectroscopy showed that much more dramatic changes were produced by urea denaturation than by pressure. Based on the fluorescence spectrum, the genome resistance to ribonuclease, and the absence of changes in hydrodynamic properties, there was little or no disruption of the capsid under pressure. On the other hand, hemagglutination assays indicated that the main component affected by pressure was the spike protein VP4, thus accounting for changes in interaction with host cells and greatly reduced infectivity. The changes leading to inactivation did not cause removal of VP4 from the outer capsid, as verified by size-exclusion chromatography. Antibodies raised against pressurised material were as effective as antibodies raised against the intact virus, based on their neutralisation titre in plaque reduction assays, enzyme-linked immunosorbent assays and direct interaction with the particle, as measured by gel-filtration chromatography. Therefore, the new conformation of the pressurised particle did not result in loss of immunogenicity. We propose that pressure alters the receptor-binding protein VP4 by triggering changes similar to those produced when the virus interacts with target cells. As the changes in VP4 conformation caused by pressure occur prior to virus exposure to target cells, it leads to non-infectious particles and may lead to the exposure of previously occult epitopes, important for vaccine development.
Collapse
Affiliation(s)
- L Pontes
- Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Centro Nacional de Ressonância Magnética Nuclear de Macromoléculas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | | | | | | | | | | | | |
Collapse
|
34
|
Suarez E, Viegas MD, Adjouadi M, Barreto A. Relating induced changes in EEG signals to orientation of visual stimuli using the ESI-256 machine. Biomed Sci Instrum 2000; 36:33-8. [PMID: 10834205] [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: 02/16/2023]
Abstract
The focus of this study is to investigate the relations that exist between changes in the orientation of simple visual stimuli displayed to a subject and the induced changes in brain activity recorded as EEG signals. These signals are recorded using the Electric Source Imaging with 256 electrodes (ESI-256). The 256-channel EEG signals of four subjects were measured monopolarly. Each subject was stimulated visually for approximately 7.5 minutes. The stimuli consisted of a series of 300 images depicting four basic orientations of a simple graphical element: a white bar on a black background, with each one of the four orientations (horizontal, vertical, +45 degrees and -45 degrees) shown a total of 75 times in a random order. The notion of missing information under certain orientations is not addressed at this juncture. The EEG signals produced by each subject were recorded in a continuous mode using a sampling rate of 1 kHz. Pre-processing of the raw EEG data obtained consisted of epoching, exclusion of faulty electrodes, and reduction of electro-oculogram (EOG) noise due to eye blinks. Topographical maps displaying brain activities and their individual electrode recordings are used as two different means for assessing these changes. It is important to note that the simplicity of the visual stimuli was considered in view of the massive data collected for interpretation. Our goal is to observe and determine new measures that would allow for the quantification and interpretation of such EEG brain activities. Such findings might prove useful for the later use of more complex stimuli and the potential development of size and orientation independent algorithms in image processing.
Collapse
Affiliation(s)
- E Suarez
- Florida International University, Miami 33174, USA
| | | | | | | |
Collapse
|
35
|
Grafals O, Gupta N, Cremades G, Barreto A, Adjouadi M. Decreased 3D-sound spatialization accuracy caused by speech bandwidth limitation over commodity audio components. Biomed Sci Instrum 2000; 36:245-50. [PMID: 10834240] [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: 02/16/2023]
Abstract
This paper studies the accuracy achievable in spatialized speech signals due to their limited bandwidth, in systems based on generic Head-Related Transfer Functions (HRTFs). The accuracy in the perception of sounds spatialized through HRTFs to emulate nine sound locations around the listener, at 0 elevation, are investigated. The tests contrast the localization accuracy for a speech segment and that for broadband noise, as perceived by two independent groups of 10 normal-hearing volunteers each. The sound localization perceived and reported by each subject is compared to the HRTF-emulated location, to define a localization error, in each case. The results are analyzed through a repeated measures, mixed-factorial design Analysis of Variance (ANOVA). The emulated source locations and the type of sounds are the independent variables, and the average perceived localization error for each case, the dependent variable. Since the spectrum of speech signals drive only sections of the complete HRTF frequency response for each location, the initial expectation is that they benefit less from the spectral-shaping process implemented by the HRTFs, thus resulting in a lower spatialization efficiency than the one for a full-spectrum noise signal. We study the measurement of these effects when 3D-sounds are delivered over commodity audio components, because of their widespread use in practical systems.
Collapse
Affiliation(s)
- O Grafals
- Department of Electrical & Computer Engineering, Florida International University, USA
| | | | | | | | | |
Collapse
|
36
|
Melo J, Beby-Defaux A, Faria C, Guiraud G, Folgosa E, Barreto A, Agius G. HIV and HTLV prevalences among women seen for sexually transmitted diseases or pregnancy follow-up in Maputo, Mozambique. J Acquir Immune Defic Syndr 2000; 23:203-4. [PMID: 10737436 DOI: 10.1097/00126334-200002010-00013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
37
|
Salas RA, Tovar D, Barreto A, de Miller E, Leitmeyer K, Rico-Hesse R. [Serotypes and genotypes of dengue virus circulating in Venezuela, 1990-1997]. Acta Cient Venez 1999; 49 Suppl 1:33-7. [PMID: 10030052] [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: 02/10/2023]
Abstract
Due to the increasing severity of hemorrhagic dengue epidemics during the last years in Venezuela, a retrospective analysis was conducted to identify the behaviour of the dengue virus serotypes circulating in the country and the molecular evolution of dengue virus serotype 2. The data presented here indicates that dengue virus serotypes 1, 2 and 4 are endemic in Venezuela, they circulate simultaneously around the year in the biggest urban cities, however, one particular serotype is predominant during an epidemic period and replaces the virus serotype dominant during the previous epidemic period. The increased severity of dengue fever since 1989 in Venezuela might be associated to the introduction of the Asiatic genotype of virus which replaced the autochthonous Caribbean genotype. The Asiatic genotype is recognised as a more virulent virus.
Collapse
Affiliation(s)
- R A Salas
- Instituto Nacional de Higiene Rafael Rangel, Ministerio de Sanidad y Asistencia Social, Caracas, Venezuela
| | | | | | | | | | | |
Collapse
|
38
|
Bury T, Barreto A, Daenen F, Barthelemy N, Ghaye B, Rigo P. Fluorine-18 deoxyglucose positron emission tomography for the detection of bone metastases in patients with non-small cell lung cancer. Eur J Nucl Med 1998; 25:1244-7. [PMID: 9724372 DOI: 10.1007/s002590050291] [Citation(s) in RCA: 244] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Despite advances in morphological imaging, some patients with lung cancer are found to have non resectable disease at surgery or die of recurrence within a year of surgery. At present, metastatic bone involvement is usually assessed using bone scintigraphy, which has a high sensitivity but a poor specificity. We have attempted to evaluate the utility of the fluorine-18 deoxyglucose positron emission tomography (FDG PET) for the detection of bone metastasis. One hundred and ten consecutive patients with histological diagnosis of non-small cell lung cancer (NSCLC) who underwent both FDG PET and bone scintigraphy were selected for this review. In this group, there were 43 patients with metastatic disease (stage IV). Among these, 21 (19% of total group) had one or several bone metastases confirmed by biopsy (n = 8) or radiographic techniques (n = 13). Radionuclide bone scanning correctly identified 54 out of 89 cases without osseous involvement and 19 out of 21 osseous involvements. On the other hand, FDG PET correctly identified the absence of osseous involvement in 87 out of 89 patients and the presence of bone metastasis in 19 out of 21 patients. Thus using PET there were two false-negative and two false-positive cases. PET and bone scanning had, respectively, an accuracy of 96% and 66% in the evaluation of osseous involvement in patients with NSCLC. In conclusion, our data suggest that whole-body FDG PET may be useful in detecting bone metastases in patients with known NSCLC.
Collapse
Affiliation(s)
- T Bury
- Pneumology Department, CHU Liège, Belgium
| | | | | | | | | | | |
Collapse
|
39
|
Monte CM, Ashworth A, Nations MK, Lima AA, Barreto A, Huttly SR. Designing educational messages to improve weaning food hygiene practices of families living in poverty. Soc Sci Med 1997; 44:1453-64. [PMID: 9160436 DOI: 10.1016/s0277-9536(96)00241-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This paper describes a methodology to design feasible interventions to improve weaning food hygiene practices of families living in extreme poverty. Educational messages to promote specific behavioural changes were defined and tested by utilizing a combination of ethnographic, survey and observational methods, and integrating viewpoints and suggestions of mothers and caretakers into the decision-making process. This new approach culminated in a household trial in which five groups, each of 15 non-practising mothers, were invited to adopt defined behaviours (handwashing before and after defined events, boiling water for reconstituting powdered milk, feeding gruel by spoon rather than bottlefeeding, not storing gruels and milks, and all four together). All initiated the advocated behaviours and most (53-80%) sustained the new behaviours and practised them every time during a one-month period. Of the four advocated behaviours, spoon-feeding was the most difficult to adopt wholly. The methodology was developed in response to the high priority given to reducing weaning food contamination for diarrhoeal disease control, and the lack of any existing methodology for defining appropriate educational interventions in resource-poor regions. This approach, with its combination of qualitative and quantitative methods and community focus, is recommended for future studies to design hygiene and other health education interventions in developing countries.
Collapse
Affiliation(s)
- C M Monte
- Unidade de Pesquisas Clínicas, Universidade Federal do Ceará, Fortaleza, Brazil
| | | | | | | | | | | |
Collapse
|
40
|
Abstract
In this paper we describe a dysentery outbreak in Mozambique during 1993. A total of 47,483 cases and 199 deaths were reported, with an incidence rate of 292.5/100,000 and a fatality rate of 0.25% for the whole country. Of the 144 districts in the country 123 were affected: those situated along the principal communications routes and corridors had high incidence rates, up to 3308/100,000. All the provincial capitals were affected with incidence rates between 59.6 and 4381.8/100,000. Shigella dysenteriae type 1 was identified as the aetiological agent. This strain was sensitive to nalidixic acid, cephalosporins, gentamicin and kanamycin, and resistant to tetracyclines, trimethoprim, chloramphenicol, ampicillin, sulphisoxazole, cotrimoxazol and erythromycin. This is the first dysentery epidemic caused by S. dysenteriae type 1 reported in Mozambique. The epidemic still continues. Population movements after the war, poor levels of sanitation and poverty contributed to the gravity of the outbreak.
Collapse
|
41
|
|
42
|
|
43
|
Abstract
The results of an epidemiological analysis of cholera in Mozambique from 1973 to 1992 are described. The project sought to assess the influence of socio-economic and ecological factors the spread of cholera in a country at war. Information about the incidence of cholera and the fatality rate were related to the rainfall and the annual average growth rate of the population in the main cities. Water supply, sanitation and food hygiene were also studied. The high annual average growth rate of the population was found to have a direct linear correlation to the incidence of cholera. The drought of 1991-1992 also played an important role in the increased number of cases of the disease. Cholera has presented an endemic-epidemic pattern determined by: a) the uncontrolled growth of urban population, b) the deterioration of sanitation in urban centers, c) the unhygienic commercialization of food and d) the drought.
Collapse
Affiliation(s)
- M Aragón
- Departamento de Epidemiologia e Endemias, Ministério de Saúde de Moçambique
| | | | | | | | | | | |
Collapse
|
44
|
Cheng K, Chan WW, Arias R, Barreto A, Butler B. PMA-sensitive protein kinase C is not necessary in TRH-stimulated prolactin release from female rat primary pituitary cells. Life Sci 1992; 51:1957-67. [PMID: 1453879 DOI: 10.1016/0024-3205(92)90113-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 12/27/2022]
Abstract
In GH3 cells and other clonal rat pituitary tumor cells, TRH has been shown to mediate its effects on prolactin release via a rise of cytosolic Ca2+ and activation of protein kinase C. In this study, we examined the role of protein kinase C in TRH-stimulated prolactin release from female rat primary pituitary cell culture. Both TRH and PMA stimulated prolactin release in a dose-dependent manner. When present together at maximal concentrations, TRH and PMA produced an effect which was slightly less than additive. Pretreatment of rat pituitary cells with 10(-6) M PMA for 24 hrs completely down-regulated protein kinase C, since such PMA-pretreated cells did not release prolactin in response to a second dose of PMA. Interestingly, protein kinase C down-regulation had no effect on TRH-induced prolactin release from rat pituitary cells. In contrast, PMA-pretreated GH3 cells did not respond to a subsequent stimulation by either PMA or TRH. Pretreatment of rat pituitary cells with TRH (10(-7) M, 24 hrs) inhibited the subsequent response to TRH, but not PMA. Forskolin, an adenylate cyclase activator, stimulated prolactin release by itself and in a synergistic manner when incubated together with TRH or PMA. The synergistic effects of forskolin on prolactin release was greater in the presence of PMA than TRH. Down-regulation of protein kinase C by PMA pretreatment abolished the synergistic effect produced by PMA and forskolin but had no effect on those generated by TRH and forskolin. sn-1,2-Dioctanylglycerol (DOG) pretreatment attenuated the subsequent response to DOG and PMA but not TRH. The effect of TRH, but not PMA, on prolactin release required the presence of extracellular Ca2+. In conclusion, the mechanism by which TRH causes prolactin release from rat primary pituitary cells is different from that of GH3 cells; the former is a protein kinase C-independent process whereas the latter is at least partially dependent upon the activation of protein kinase C.
Collapse
Affiliation(s)
- K Cheng
- Department of Growth Biochemistry and Physiology, Merck Research Laboratories, Rahway, NJ 07065
| | | | | | | | | |
Collapse
|
45
|
Cheng K, Chan WW, Butler B, Barreto A, Smith RG. Evidence for a role of protein kinase-C in His-D-Trp-Ala-Trp-D-Phe-Lys-NH2-induced growth hormone release from rat primary pituitary cells. Endocrinology 1991; 129:3337-42. [PMID: 1659529 DOI: 10.1210/endo-129-6-3337] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.9] [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: 12/28/2022]
Abstract
We have recently reported that His-D-Trp-Ala-Trp-D-Phe-Lys-NH2 (GHRP-6) synergizes with GH-releasing factor (GRF) to increase GH release and cAMP accumulation in rat pituitary cells in vitro. This study was undertaken to further investigate the mechanism of action of GHRP-6 on GH release, particularly the involvement of protein kinase-C. Forskolin (10(-5) M), A23187 (10(-6) M), and phorbol 12-myristate 13-acetate (PMA; 10(-7) M) all stimulated GH release. However, only PMA can mimic the synergistic effects of GHRP-6 on GRF-stimulated GH release and intracellular cAMP accumulation. 4 alpha-Phorbol 12,13-didecanoate, an inactive phorbol ester, was unable to stimulate GH release or potentiate the effect of GRF. Extracellularly added phospholipase-C not only stimulated GH release in a dose-dependent manner, but also potentiated GRF-induced GH release. Phloretin, a protein kinase-C inhibitor, in a concentration range of 10-250 microM had very little or no effect on basal and GRF-stimulated GH release, but markedly inhibited the stimulatory effects induced by either PMA or GHRP-6. Incubation of rat pituitary cells with 10(-6) M PMA for 24 h completely down-regulated protein kinase-C, since such PMA-pretreated cells did not release GH in response to a second dose of PMA. The protein kinase-C-depleted cells had an attenuated GHRP-6 response, but they responded normally to GRF. Moreover, the synergistic effects of GHRP-6 and GRF on GH release and cAMP accumulation were also greatly inhibited by protein kinase-C down-regulation. These data suggest that the effects of GHRP-6 on GH release, either alone or together with GRF, are at least partially mediated via the activation of protein kinase-C.
Collapse
Affiliation(s)
- K Cheng
- Department of Growth Biochemistry and Physiology, Merck, Sharp, and Dohme Research Laboratories, Rahway, New Jersey 07065
| | | | | | | | | |
Collapse
|
46
|
Barreto A. [The secret of healers (Brazil)]. Med Trop (Mars) 1991; 51:421-7. [PMID: 1800881] [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: 12/28/2022]
Abstract
The Bresilian civilization presents a mixing of cultures (african, european, amerindian ... ) who are original but complicated in a socio-economical context of a developing country. Psychiater and anthropologist, the author tries to inquire into the secret of traditional practitioners. He thinks that they play a prominent part in the individual medicine near the official medicine and they will be precious assistants in the Bresilian Health System after a complementary formation in the Hospital.
Collapse
Affiliation(s)
- A Barreto
- Département de Santé Communautaire de l'Université Fédérale du Ceara, Brésil
| |
Collapse
|
47
|
Abstract
beta-Adrenergic agents powerfully stimulate muscle growth in animals. Whether the mechanism of action involves a direct effect on muscle cell beta-receptors or is secondarily due to a beta-induced alteration in the hormonal environment is not known. To assess whether direct beta-receptor activation results in muscle protein accretion, we examined the effect of the beta-agonist zinterol on several anabolic processes in L8 muscle cells in culture. In vivo feeding of zinterol (26.5 ppm) to rats significantly increased muscle weight by 15%. In vitro, zinterol stimulated lactate release from L8 cells whereas propranolol inhibited this process, demonstrating that these cells have functional beta-receptors both before and after fusion. We measured several anabolic processes, in both serum-stimulated and quiescent cells, over a wide range of zinterol concentrations. Zinterol had no effect on protein or DNA synthesis, protein degradation, or rates of amino acid uptake. These data suggest that the in vivo muscle growth stimulation is either indirect or some in vivo requirements (e.g. tension and nerve interactions) are necessary for expression of the effect.
Collapse
Affiliation(s)
- M A McElligott
- Merck Sharp & Dohme Research Laboratories, Department of Animal Drug Discovery, Rahway, NJ 07065
| | | | | |
Collapse
|
48
|
Cheng K, Chan WW, Barreto A, Convey EM, Smith RG. The synergistic effects of His-D-Trp-Ala-Trp-D-Phe-Lys-NH2 on growth hormone (GH)-releasing factor-stimulated GH release and intracellular adenosine 3',5'-monophosphate accumulation in rat primary pituitary cell culture. Endocrinology 1989; 124:2791-8. [PMID: 2541999 DOI: 10.1210/endo-124-6-2791] [Citation(s) in RCA: 208] [Impact Index Per Article: 5.9] [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: 01/01/2023]
Abstract
His-D-Trp-Ala-Trp-D-Phe-Lys-NH2 (GHRP-6) stimulated GH release from rat primary pituitary cells in a time- and dose-dependent manner. Stimulation was observed after a 15-min, but not a 4-h, incubation. The concentrations of GHRP-6 required for half-maximal and maximal stimulation were 7 x 10(-9) and 10(-7) M, respectively. GH release induced by GHRP-6 was not affected by the addition of either naloxone or the GRF antagonist [N-Ac-Tyr1,D-Arg2]GRF-(1-29)-NH2. The latter inhibited GRF-stimulated GH release by shifting the dose-response curve to the right. His-D-Trp-D-Lys-Trp-D-Phe-Lys-NH2, an analog of GHRP-6, inhibited GH release stimulated by GHRP-6 without affecting that induced by GRF. When present together at maximal concentrations, GHRP-6 and GRF produced a synergistic effect on GH release. GHRP-6 had no effect on intracellular cAMP levels, whereas GRF increased intracellular cAMP concentrations by 3-fold. Combined treatment of pituitary cells with GRF and GHRP-6 resulted in a potentiation of the GRF-induced increase in cAMP levels. Basal GH release was reduced by 30% after pretreatment with GHRP-6 (10(-7) M) for 1 h. Pretreatment with GHRP-6 also decreased the subsequent response to GHRP-6, but not GRF. In contrast, pretreatment with GRF for 1 h had no effect on the subsequent action of GHRP-6 or GRF on GH release. The desensitization induced by GHRP-6 was completely reversed within 1 h after removal of the peptide. Results from this study indicate that GHRP-6 and GRF stimulated GH release from somatotrophs via different receptors and through discrete mechanisms.
Collapse
Affiliation(s)
- K Cheng
- Merck, Sharp, and Dohme Research Laboratories, Department of Growth Biochemistry and Physiology, Rahway, New Jersey 07065
| | | | | | | | | |
Collapse
|
49
|
McElligott MA, Barreto A, Chaung LY. Effect of continuous and intermittent clenbuterol feeding on rat growth rate and muscle. Comp Biochem Physiol C Comp Pharmacol Toxicol 1989; 92:135-8. [PMID: 2566434 DOI: 10.1016/0742-8413(89)90215-6] [Citation(s) in RCA: 22] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
1. The growth response to clenbuterol is a dynamic process. 2. Body weight gain is stimulated within two days of treatment and the effect attenuates by two weeks of treatment. 3. Intermittent feeding prevents the attenuation of the growth response. 4. Muscle weight increased 14-22% by both feeding regimens. 5. Clenbuterol decreased cathepsin B activity in the EDL and gastrocnemius and increased the activity in the soleus after two weeks of continuous clenbuterol treatment.
Collapse
Affiliation(s)
- M A McElligott
- Merck Sharp & Dohme Research Laboratories, Department of Physiology and Biochemistry, Rahway, NJ 07065
| | | | | |
Collapse
|
50
|
Márquez-Sárraga RH, Barreto A. Alternate methods of breast reconstruction used in one patient: case report. Bol Asoc Med P R 1987; 79:461-3. [PMID: 3689533] [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: 01/06/2023]
|