1
|
Sengupta S, Tubio CR, Pinto RS, Barbosa J, Silva MM, Gonçalves R, Kundu M, Lanceros-Mendez S, Costa CM. Ternary composites of poly(vinylidene fluoride-co-hexafluoropropylene) with silver nanowires and titanium dioxide nanoparticles as separator membranes for lithium-ion batteries. J Colloid Interface Sci 2024; 668:25-36. [PMID: 38669993 DOI: 10.1016/j.jcis.2024.04.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/12/2024] [Accepted: 04/21/2024] [Indexed: 04/28/2024]
Abstract
In the realm of polymer composites, there is growing interest in the use of mora than one filler for achieving multifunctional properties. In this work, a composite separator membrane has been developed for lithium-ion battery application, by incorporating conductive silver nanowires (AgNWs) and titanium dioxide (TiO2) nanoparticles into a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer matrix. The composite membranes were manufactured by solvent casting and thermally induced phase separation, with total filler content varying up to 10 wt%. The ternary composites composites present improved mechanical characteristics, ionic conductivity and lithium transfer number compared to the neat polymer matrix. On the other hand, the filler type and content within the composite has little bearing on the morphology, polymer phase, or thermal stability. Once applied as a separator in lithium-ion batteries, the highest discharge capacity value was obtained for the 5 wt% AgNWs/5 wt% TiO2/PVDF-HFP membrane at different C-rates, benefiting from the synergetic effect from both fillers. This work demonstrates that higher battery performance can be achieved for next-generation lithium-ion batteries by using separator membranes based on ternary composites.
Collapse
Affiliation(s)
- S Sengupta
- Electrochemial Energy Storage Laboratory, Department of Chemistry, SRM Institute of Science and Technology, Chennai, India
| | - C R Tubio
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
| | - R S Pinto
- Centre of Chemistry, University of Minho, 4710-057 Braga, Portugal; Centre of Physics Universities of Minho and Porto, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - J Barbosa
- Centre of Chemistry, University of Minho, 4710-057 Braga, Portugal
| | - M M Silva
- Centre of Chemistry, University of Minho, 4710-057 Braga, Portugal
| | - R Gonçalves
- Centre of Chemistry, University of Minho, 4710-057 Braga, Portugal
| | - M Kundu
- Electrochemial Energy Storage Laboratory, Department of Chemistry, SRM Institute of Science and Technology, Chennai, India; International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330 Braga, Portugal.
| | - S Lanceros-Mendez
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; Centre of Physics Universities of Minho and Porto, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; Laboratory of Physics for Materials and Emergent Technologies, LapMET, University of Minho, Braga 4710-057, Portugal; Ikerbasque, Basque Foundation for Science, 48009 Bilbao, Spain
| | - C M Costa
- Centre of Physics Universities of Minho and Porto, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; Laboratory of Physics for Materials and Emergent Technologies, LapMET, University of Minho, Braga 4710-057, Portugal; Institute of Science and Innovation for Bio-Sustainability (IB-S), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| |
Collapse
|
2
|
de Almeida Marques DP, Andrade LAF, Reis EVS, Clarindo FA, Moraes TDFS, Lourenço KL, De Barros WA, Costa NEM, Andrade LMD, Lopes-Ribeiro Á, Coêlho Maciel MS, Corrêa-Dias LC, de Almeida IN, Arantes TS, Litwinski VCV, de Oliveira LC, Serafim MSM, Maltarollo VG, Guatimosim SC, Silva MM, Tsuji M, Ferreira RS, Barreto LV, Barbosa-Stancioli EF, da Fonseca FG, De Fátima Â, Coelho-Dos-Reis JGA. New anti-SARS-CoV-2 aminoadamantane compounds as antiviral candidates for the treatment of COVID-19. Virus Res 2024; 340:199291. [PMID: 38065303 PMCID: PMC10733093 DOI: 10.1016/j.virusres.2023.199291] [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: 10/07/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 12/17/2023]
Abstract
Here, the antiviral activity of aminoadamantane derivatives were evaluated against SARS-CoV-2. The compounds exhibited low cytotoxicity to Vero, HEK293 and CALU-3 cells up to a concentration of 1,000 µM. The inhibitory concentration (IC50) of aminoadamantane was 39.71 µM in Vero CCL-81 cells and the derivatives showed significantly lower IC50 values, especially for compounds 3F4 (0.32 µM), 3F5 (0.44 µM) and 3E10 (1.28 µM). Additionally, derivatives 3F5 and 3E10 statistically reduced the fluorescence intensity of SARS-CoV-2 protein S from Vero cells at 10 µM. Transmission microscopy confirmed the antiviral activity of the compounds, which reduced cytopathic effects induced by the virus, such as vacuolization, cytoplasmic projections, and the presence of myelin figures derived from cellular activation in the face of infection. Additionally, it was possible to observe a reduction of viral particles adhered to the cell membrane and inside several viral factories, especially after treatment with 3F4. Moreover, although docking analysis showed favorable interactions in the catalytic site of Cathepsin L, the enzymatic activity of this enzyme was not inhibited significantly in vitro. The new derivatives displayed lower predicted toxicities than aminoadamantane, which was observed for either rat or mouse models. Lastly, in vivo antiviral assays of aminoadamantane derivatives in BALB/cJ mice after challenge with the mouse-adapted strain of SARS-CoV-2, corroborated the robust antiviral activity of 3F4 derivative, which was higher than aminoadamantane and its other derivatives. Therefore, aminoadamantane derivatives show potential broad-spectrum antiviral activity, which may contribute to COVID-19 treatment in the face of emerging and re-emerging SARS-CoV-2 variants of concern.
Collapse
Affiliation(s)
- Daisymara Priscila de Almeida Marques
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Luis Adan Flores Andrade
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil; Centro Tecnológico de Vacinas (CT Vacinas), Belo Horizonte, MG, Brazil
| | - Erik Vinicius Sousa Reis
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Felipe Alves Clarindo
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Thaís de Fátima Silva Moraes
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Karine Lima Lourenço
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil; Centro Tecnológico de Vacinas (CT Vacinas), Belo Horizonte, MG, Brazil
| | - Wellington Alves De Barros
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Nathália Evelyn Morais Costa
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Lídia Maria de Andrade
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Ágata Lopes-Ribeiro
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Mariella Sousa Coêlho Maciel
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Laura Cardoso Corrêa-Dias
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Isabela Neves de Almeida
- Departamento de Análises Clínicas, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil; Laboratório de Micobacterioses, Faculdade de Medicina, Universidade Federal de, Minas Gerais, Belo Horizonte, MG, Brazil
| | - Thalita Souza Arantes
- Centro de Microscopia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Vivian Costa Vasconcelos Litwinski
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Leonardo Camilo de Oliveira
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Mateus Sá Magalhães Serafim
- Laboratório de Virus, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Vinicius Gonçalves Maltarollo
- Departamento de Produtos Farmacêuticos da Faculdade de Farmácia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Silvia Carolina Guatimosim
- Departamento de Fisiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Mário Morais Silva
- Departamento de Fisiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Moriya Tsuji
- Aaron Diamond AIDS Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Rafaela Salgado Ferreira
- Laboratório de Modelagem Molecular e Planejamento de Fármacos, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Luiza Valença Barreto
- Laboratório de Modelagem Molecular e Planejamento de Fármacos, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, Belo Horizonte, MG, Brazil
| | - Edel Figueiredo Barbosa-Stancioli
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Flávio Guimarães da Fonseca
- Laboratório de Virologia Básica e Aplicada (LVBA), Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil; Centro Tecnológico de Vacinas (CT Vacinas), Belo Horizonte, MG, Brazil
| | - Ângelo De Fátima
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
| | | |
Collapse
|
3
|
de Lima Sanches B, Souza-Neto F, de Alcântara-Leonídeo TC, Silva MM, Guatimosim S, Vieira MAR, Santos RAS, da Silva RF. Alamandine attenuates oxidative stress in the right carotid following transverse aortic constriction in mice. Peptides 2024; 171:171094. [PMID: 37696437 DOI: 10.1016/j.peptides.2023.171094] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 08/25/2023] [Accepted: 08/30/2023] [Indexed: 09/13/2023]
Abstract
OBJECTIVE Pressure overload can result in significant changes to the structure of blood vessels, a process known as vascular remodeling. High levels of tension can cause vascular inflammation, fibrosis, and structural alterations to the vascular wall. Prior research from our team has demonstrated that the oral administration of alamandine can promote vasculoprotective effects in mice aorta that have undergone transverse aortic constriction (TAC). Furthermore, changes in local hemodynamics can affect the right and left carotid arteries differently after TAC. Thus, in this study, we aimed to assess the effects of alamandine treatment on right carotid remodeling and the expression of oxidative stress-related substances induced by TAC. METHODS AND RESULTS Male C57BL/6 mice were categorized into three groups: Sham, TAC, and TAC treated with alamandine (TAC+ALA). Alamandine treatment was administered orally by gavage (30 µg/kg/day), starting three days before the surgery, and continuing for a period of fourteen days. Morphometric analysis of hematoxylin and eosin-stained sections revealed that TAC induced hypertrophic and positive remodeling in the right carotid artery. Picrosirius Red staining also demonstrated an increase in total collagen deposition in the right carotid artery due to TAC-induced vascular changes. Alamandine treatment effectively prevented the increase in reactive oxygen species production and depletion of nitric oxide levels, which were induced by TAC. Finally, alamandine treatment was also shown to prevent the increased expression of nuclear factor erythroid 2-related factor 2 and 3-nitrotyrosine that were induced by TAC. CONCLUSION Our results suggest that alamandine can effectively attenuate pathophysiological stress in the right carotid artery of animals subjected to TAC.
Collapse
Affiliation(s)
- Bruno de Lima Sanches
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; National Institute of Science and Technology in Nanobiopharmaceutics (INCT-Nanobiofar), Belo Horizonte, Minas Gerais, Brazil
| | - Fernando Souza-Neto
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; Cancer & Cardiovascular Research Building, University of Minnesota, Minneapolis, MN, USA
| | | | - Mário Morais Silva
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; National Institute of Science and Technology in Nanobiopharmaceutics (INCT-Nanobiofar), Belo Horizonte, Minas Gerais, Brazil
| | - Silvia Guatimosim
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; National Institute of Science and Technology in Nanobiopharmaceutics (INCT-Nanobiofar), Belo Horizonte, Minas Gerais, Brazil
| | | | - Robson Augusto Souza Santos
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; National Institute of Science and Technology in Nanobiopharmaceutics (INCT-Nanobiofar), Belo Horizonte, Minas Gerais, Brazil.
| | - Rafaela Fernandes da Silva
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
| |
Collapse
|
4
|
Guimaraes DA, Aquino NSS, Rocha-Resende C, Jesus ICG, Silva MM, Scalzo SA, Fonseca RC, Durand MT, Pereira V, Tezini GCSV, Oliveira A, Prado VF, Stefanon I, Salgado HC, Prado MAM, Szawka RE, Guatimosim S. Neuronal cholinergic signaling constrains norepinephrine activity in the heart. Am J Physiol Cell Physiol 2022; 322:C794-C801. [PMID: 35264016 DOI: 10.1152/ajpcell.00031.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It is well known that cholinergic hypofunction contributes to cardiac pathology; yet, the mechanisms involved remain unclear. Our previous publication has shown that genetically engineered model of cholinergic deficit, the vesicular acetylcholine transporter knockdown homozygous (VAChT KDHOM) mice exhibit pathological cardiac remodeling and a gradual increase in cardiac mass with aging. Given that an increase in cardiac mass is often caused by adrenergic hyperactivity, we hypothesized that VAChT KDHOM mice might have an increase in cardiac norepinephrine (NE) levels. We thus investigated the temporal changes in NE content in the heart from 3, 6 and 12 month-old VAChT mutants. Interestingly, mice with cholinergic hypofunction showed a gradual elevation in cardiac NE content, which was already increased at 6 months of age. Consistent with this finding, 6 month-old VAChT KDHOM mice showed enhanced sympathetic activity and a greater abundance of tyrosine hydroxylase positive sympathetic nerves in the heart. VAChT mutants exhibited an increase in peak calcium transient, and mitochondrial oxidative stress in cardiomyocytes along with enhanced GRK5 and NFAT staining in the heart. These are known targets of adrenergic signaling in the cell. Moreover, vagotomized-mice displayed an increase in cardiac NE content confirming the data obtained in VAChT KDHOM mice. Establishing a causal relationship between acetylcholine and NE, VAChT KDHOM mice treated with pyridostigmine, a cholinesterase inhibitor, showed reduced cardiac NE content, rescuing the phenotype. Our findings unveil a yet unrecognized role of cholinergic signaling as a modulator of cardiac NE, providing novel insights into the mechanisms that drive autonomic imbalance.
Collapse
Affiliation(s)
- Diogo A Guimaraes
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Nayara S S Aquino
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Cibele Rocha-Resende
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Itamar C G Jesus
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Mário Morais Silva
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Sergio A Scalzo
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Roberta Cristelli Fonseca
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marina T Durand
- Universidade de Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil
| | - Vanessa Pereira
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | | | - André Oliveira
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Vânia F Prado
- Robarts Research Institute, The University of Western Ontario, Department of Physiology 1and Pharmacology, Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Canada
| | - Ivanita Stefanon
- Department of Physiological Sciences, Universidade Federal do Espírito Santo, Vitória, Espirito Santo, Brazil
| | - Helio C Salgado
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Marco Antonio Máximo Prado
- Robarts Research Institute, The University of Western Ontario, Department of Physiology 1and Pharmacology, Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Canada
| | - Raphael E Szawka
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Silvia Guatimosim
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| |
Collapse
|
5
|
Safranauskas RMSO, Kishimoto RK, Cordeiro MG, Santos MFMD, Silva MM, Oki CK, Dobo C, Filippi RZ, Bezerra AMPS, Velloso EDRP. VALIDAÇÃO DA TÉCNICA DE FISH EM IMPRINT DE BIÓPSIA DE NEOPLASIAS HEMATOLÓGICAS. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.742] [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: 11/27/2022] Open
|
6
|
Savedra RML, Fonseca AMT, Silva MM, Bianchi RF, Siqueira MF. White LED phototherapy as an improved treatment for neonatal jaundice. Rev Sci Instrum 2021; 92:064101. [PMID: 34243508 DOI: 10.1063/5.0046430] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 05/15/2021] [Indexed: 06/13/2023]
Abstract
With the aim of improving phototherapy for neonatal jaundice (hyperbilirubinemia), this study investigates the degradation of unconjugated bilirubin under irradiance by conventional light and by white, red, green, and blue LED sources in vitro. The absorption spectra of bilirubin under these different light sources are compared. The results demonstrate that white LED phototherapy promotes more efficient bilirubin degradation than conventional blue-light therapy. This study provides a basis for the design of novel phototherapy devices for the treatment of hyperbilirubinemia.
Collapse
Affiliation(s)
- R M L Savedra
- Departamento de Física da Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil
| | - A M T Fonseca
- Departamento de Física da Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil
| | - M M Silva
- Departamento de Física da Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil
| | - R F Bianchi
- Departamento de Física da Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil
| | - M F Siqueira
- Departamento de Física da Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil
| |
Collapse
|
7
|
Teixeira VP, Miranda K, Scalzo S, Rocha-Resende C, Silva MM, Tezini GCSV, Melo MB, Souza-Neto FP, Silva KSC, Jesus ICG, Santos AK, de Oliveira M, Szawka RE, Salgado HC, Prado MAM, Poletini MO, Guatimosim S. Increased cholinergic activity under conditions of low estrogen leads to adverse cardiac remodeling. Am J Physiol Cell Physiol 2021; 320:C602-C612. [PMID: 33296286 DOI: 10.1152/ajpcell.00142.2020] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 12/03/2020] [Indexed: 02/07/2023]
Abstract
Cholinesterase inhibitors are used in postmenopausal women for the treatment of neurodegenerative diseases. Despite their widespread use in the clinical practice, little is known about the impact of augmented cholinergic signaling on cardiac function under reduced estrogen conditions. To address this gap, we subjected a genetically engineered murine model of systemic vesicular acetylcholine transporter overexpression (Chat-ChR2) to ovariectomy and evaluated cardiac parameters. Left-ventricular function was similar between Chat-ChR2 and wild-type (WT) mice. Following ovariectomy, WT mice showed signs of cardiac hypertrophy. Conversely, ovariectomized (OVX) Chat-ChR2 mice evolved to cardiac dilation and failure. Transcript levels for cardiac stress markers atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP) were similarly upregulated in WT/OVX and Chat-ChR2/OVX mice. 17β-Estradiol (E2) treatment normalized cardiac parameters in Chat-ChR2/OVX to the Chat-ChR2/SHAM levels, providing a link between E2 status and the aggravated cardiac response in this model. To investigate the cellular basis underlying the cardiac alterations, ventricular myocytes were isolated and their cellular area and contractility were assessed. Myocytes from WT/OVX mice were wider than WT/SHAM, an indicative of concentric hypertrophy, but their fractional shortening was similar. Conversely, Chat-ChR2/OVX myocytes were elongated and presented contractile dysfunction. E2 treatment again prevented the structural and functional changes in Chat-ChR2/OVX myocytes. We conclude that hypercholinergic mice under reduced estrogen conditions do not develop concentric hypertrophy, a critical compensatory adaptation, evolving toward cardiac dilation and failure. This study emphasizes the importance of understanding the consequences of cholinesterase inhibition, used clinically to treat dementia, for cardiac function in postmenopausal women.
Collapse
MESH Headings
- Acetylcholine/metabolism
- Animals
- Cholinergic Fibers/metabolism
- Estradiol/pharmacology
- Estrogen Replacement Therapy
- Estrogens/deficiency
- Female
- Heart/innervation
- Heart Rate
- Hypertrophy, Left Ventricular/metabolism
- Hypertrophy, Left Ventricular/pathology
- Hypertrophy, Left Ventricular/physiopathology
- Hypertrophy, Left Ventricular/prevention & control
- Mice, Inbred C57BL
- Mice, Transgenic
- Myocardial Contraction
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Ovariectomy
- Signal Transduction
- Ventricular Dysfunction, Left/metabolism
- Ventricular Dysfunction, Left/pathology
- Ventricular Dysfunction, Left/physiopathology
- Ventricular Dysfunction, Left/prevention & control
- Ventricular Function, Left/drug effects
- Ventricular Remodeling/drug effects
- Vesicular Acetylcholine Transport Proteins/genetics
- Vesicular Acetylcholine Transport Proteins/metabolism
- Mice
Collapse
Affiliation(s)
- Vanessa P Teixeira
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Kiany Miranda
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Sergio Scalzo
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Cibele Rocha-Resende
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Mário Morais Silva
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Geisa C S V Tezini
- Ribeirão Preto Medical School, Universidade de São Paulo, Riberão Preto, São Paulo, Brazil
| | - Marcos B Melo
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Fernando Pedro Souza-Neto
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Kaoma S C Silva
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Itamar C G Jesus
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Anderson K Santos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Mauro de Oliveira
- Ribeirão Preto Medical School, Universidade de São Paulo, Riberão Preto, São Paulo, Brazil
| | - Raphael E Szawka
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Helio C Salgado
- Ribeirão Preto Medical School, Universidade de São Paulo, Riberão Preto, São Paulo, Brazil
| | - Marco Antonio Máximo Prado
- Robarts Research Institute, Department of Physiology and Pharmacology and Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario, Canada
| | - Maristela O Poletini
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Silvia Guatimosim
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| |
Collapse
|
8
|
Silva RL, Figueira AA, Silva MM, Dias TS, Machado LS, Soares NM, Nascimento ER, Pereira VLA. Detection of Mycoplasma Synoviae and Other Pathogens in Laying Hens with Respiratory Signs in the Rearing and Production Phases. Braz J Poult Sci 2021. [DOI: 10.1590/1806-9061-2020-1318] [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] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- RL Silva
- Universidade Federal Fluminense, Brazil
| | | | - MM Silva
- Universidade Federal Fluminense, Brazil
| | - TS Dias
- Universidade Federal Fluminense, Brazil
| | - LS Machado
- Universidade Federal Fluminense, Brazil; Universidade Federal Fluminense, Brazil
| | | | - ER Nascimento
- Universidade Federal Fluminense, Brazil; Universidade Federal Fluminense, Brazil
| | - VLA Pereira
- Universidade Federal Fluminense, Brazil; Universidade Federal Fluminense, Brazil
| |
Collapse
|
9
|
Silva MM, de Souza-Neto FP, Jesus ICGD, Gonçalves GK, Santuchi MDC, Sanches BDL, de Alcântara-Leonídio TC, Melo MB, Vieira MAR, Guatimosim S, Santos RAS, da Silva RF. Alamandine improves cardiac remodeling induced by transverse aortic constriction in mice. Am J Physiol Heart Circ Physiol 2021; 320:H352-H363. [PMID: 33124885 DOI: 10.1152/ajpheart.00328.2020] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 09/30/2020] [Accepted: 10/21/2020] [Indexed: 12/30/2022]
Abstract
Alamandine is the newest identified peptide of the renin-angiotensin system (RAS) and has protective effects in the cardiovascular system. Although the involvement of classical RAS components in the genesis and progression of cardiac remodeling is well known, less is known about the effects of alamandine. Therefore, in the present study we investigated the effects of alamandine on cardiac remodeling induced by transverse aortic constriction (TAC) in mice. Male mice (C57BL/6), 10-12 wk of age, were divided into three groups: sham operated, TAC, and TAC + ALA (30 µg/kg/day alamandine for 14 days). The TAC surgery was performed under ketamine and xylazine anesthesia. At the end of treatment, the animals were submitted to echocardiographic examination and subsequently euthanized for tissue collection. TAC induced myocyte hypertrophy, collagen deposition, and the expression of matrix metalloproteinase (MMP)-2 and transforming growth factor (TGF)-β in the left ventricle. These markers of cardiac remodeling were reduced by oral treatment with alamandine. Western blotting analysis showed that alamandine prevents the increase in ERK1/2 phosphorylation and reverts the decrease in 5'-adenosine monophosphate-activated protein kinase (AMPK)α phosphorylation induced by TAC. Although both TAC and TAC + ALA increased SERCA2 expression, the phosphorylation of phospholamban in the Thr17 residue was increased solely in the alamandine-treated group. The echocardiographic data showed that there are no functional or morphological alterations after 2 wk of TAC. Alamandine treatment prevents myocyte hypertrophy and cardiac fibrosis induced by TAC. Our results reinforce the cardioprotective role of alamandine and highlight its therapeutic potential for treating heart diseases related to pressure overload conditions.NEW & NOTEWORTHY Alamandine is the newest identified component of the renin-angiotensin system protective arm. Considering the beneficial effects already described so far, alamandine is a promising target for cardiovascular disease treatment. We demonstrated for the first time that alamandine improves many aspects of cardiac remodeling induced by pressure overload, including cell hypertrophy, fibrosis, and oxidative stress markers.
Collapse
Affiliation(s)
- Mário Morais Silva
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | | | - Gleisy Kelly Gonçalves
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Bruno de Lima Sanches
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Marcos Barrouin Melo
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Silvia Guatimosim
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | | |
Collapse
|
10
|
Barbosa JC, Correia DM, Gonçalves R, de Zea Bermudez V, Silva MM, Lanceros-Mendez S, Costa CM. Enhanced ionic conductivity in poly(vinylidene fluoride) electrospun separator membranes blended with different ionic liquids for lithium ion batteries. J Colloid Interface Sci 2020; 582:376-386. [PMID: 32861042 DOI: 10.1016/j.jcis.2020.08.046] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/11/2020] [Accepted: 08/12/2020] [Indexed: 12/31/2022]
Abstract
Electrospun poly(vinylidene fluoride) (PVDF) fiber membranes doped with different ionic liquids (ILs) and sharing the same anion were produced and their potential as separator membranes for battery applications was evaluated. Different types of ILs containing the same anion, bis(trifluoromethylsulfonyl)imide [TFSI]-, were used with IL concentrations ranging between 0 and 15 wt% The morphology, microstructure, thermal and electrical properties (ionic conductivity and electrochemical window) of the membranes were evaluated. The presence of ILs in the PVDF polymer matrix influences the fiber diameter and the content of the polar β phase within the polymer, as well as the degree of crystallinity. The thermal stability of the membranes decreases with the incorporation of IL. Impedance spectroscopy tests show a maximum ionic conductivity of 2.8 mS.cm-1 for 15% of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]) at room temperature. The electrochemical stability of the samples ranges from 0.0 to 6.0 V. When evaluated as battery separator membranes in C-LiFePO4 half-cells, a maximum discharge capacity of 119 mAh.g-1 at C-rate was obtained for the PVDF membrane with 15% [Emim][TFSI], with a coulombic efficiency close to 100%. The results demonstrate that the produced electrospun membranes are suitable for applications as separators for lithium ion batteries (LIBs).
Collapse
Affiliation(s)
- J C Barbosa
- Center of Physics, University of Minho, 4710-058 Braga, Portugal; Department of Chemistry and CQ-VR, University of Trás -os -Montes e Alto Douro, 5000-801 Vila Real, Portugal
| | - D M Correia
- Center of Physics, University of Minho, 4710-058 Braga, Portugal; Department of Chemistry and CQ-VR, University of Trás -os -Montes e Alto Douro, 5000-801 Vila Real, Portugal
| | - R Gonçalves
- Center of Chemistry, University of Minho, 4710-058 Braga, Portugal
| | - V de Zea Bermudez
- Department of Chemistry and CQ-VR, University of Trás -os -Montes e Alto Douro, 5000-801 Vila Real, Portugal
| | - M M Silva
- Center of Chemistry, University of Minho, 4710-058 Braga, Portugal
| | - S Lanceros-Mendez
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
| | - C M Costa
- Center of Physics, University of Minho, 4710-058 Braga, Portugal; Center of Chemistry, University of Minho, 4710-058 Braga, Portugal.
| |
Collapse
|
11
|
Jesus ICG, Mesquita TRR, Monteiro ALL, Parreira AB, Santos AK, Coelho ELX, Silva MM, Souza LAC, Campagnole-Santos MJ, Santos RS, Guatimosim S. Alamandine enhances cardiomyocyte contractility in hypertensive rats through a nitric oxide-dependent activation of CaMKII. Am J Physiol Cell Physiol 2020; 318:C740-C750. [PMID: 31913703 DOI: 10.1152/ajpcell.00153.2019] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Overstimulation of the renin-angiotensin system (RAS) has been implicated in the pathogenesis of various cardiovascular diseases. Alamandine is a peptide newly identified as a protective component of the RAS; however, the mechanisms involved in its beneficial effects remain elusive. By using a well-characterized rat model of hypertension, the TGR (mREN2)27, we show that mREN ventricular myocytes are prone to contractile enhancement mediated by short-term alamandine (100 nmol/L) stimulation of Mas-related G protein-coupled receptor member D (MrgD) receptors, while Sprague-Dawley control cells showed no effect. Additionally, alamandine prevents the Ca2+ dysregulation classically exhibited by freshly isolated mREN myocytes. Accordingly, alamandine treatment of mREN myocytes attenuated Ca2+ spark rate and enhanced Ca2+ reuptake to the sarcoplasmic reticulum. Along with these findings, KN-93 fully inhibited the alamandine-induced increase in Ca2+ transient magnitude and phospholamban (PLN) phosphorylation at Thr17, indicating CaMKII as a downstream effector of the MrgD signaling pathway. In mREN ventricular myocytes, alamandine treatment induced significant nitric oxide (NO) production. Importantly, NO synthase inhibition prevented the contractile actions of alamandine, including PLN-Thr17 phosphorylation at the CaMKII site, thereby indicating that NO acts upstream of CaMKII in the alamandine downstream signaling. Altogether, our results show that enhanced contractile responses mediated by alamandine in cardiomyocytes from hypertensive rats occur through a NO-dependent activation of CaMKII.
Collapse
Affiliation(s)
- Itamar Couto Guedes Jesus
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.,National Institute of Science and Technology in Nanobiopharmaceutics, Belo Horizonte, Brazil
| | | | - André Luís Lima Monteiro
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Amanda Borges Parreira
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Anderson Kenedy Santos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Elizeu Lucas Xavier Coelho
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Mário Morais Silva
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Lucas A C Souza
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.,National Institute of Science and Technology in Nanobiopharmaceutics, Belo Horizonte, Brazil
| | - Maria José Campagnole-Santos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.,National Institute of Science and Technology in Nanobiopharmaceutics, Belo Horizonte, Brazil
| | - Robson Souza Santos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.,National Institute of Science and Technology in Nanobiopharmaceutics, Belo Horizonte, Brazil
| | - Silvia Guatimosim
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.,National Institute of Science and Technology in Nanobiopharmaceutics, Belo Horizonte, Brazil
| |
Collapse
|
12
|
Nunes SC, Saraiva SM, Pereira RFP, Silva MM, Carlos LD, Almeida P, Gonçalves MC, Ferreira RAS, Bermudez VDZ. Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate. Molecules 2019; 24:E1020. [PMID: 30875749 PMCID: PMC6471547 DOI: 10.3390/molecules24061020] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/06/2019] [Accepted: 03/08/2019] [Indexed: 11/16/2022] Open
Abstract
In recent years, the synthesis of polymer electrolyte systems derived from biopolymers for the development of sustainable green electrochemical devices has attracted great attention. Here electrolytes based on the red seaweeds-derived polysaccharide κ-carrageenan (κ-Cg) doped with neodymium triflate (NdTrif₃) and glycerol (Gly) were obtained by means of a simple, clean, fast, and low-cost procedure. The aim was to produce near-infrared (NIR)-emitting materials with improved thermal and mechanical properties, and enhanced ionic conductivity. Cg has a particular interest, due to the fact that it is a renewable, cost-effective natural polymer and has the ability of gelling in the presence of certain alkali- and alkaline-earth metal cations, being good candidates as host matrices for accommodating guest cations. The as-synthesised κ-Cg-based membranes are semi-crystalline, reveal essentially a homogeneous texture, and exhibit ionic conductivity values 1⁻2 orders of magnitude higher than those of the κ-Cg matrix. A maximum ionic conductivity was achieved for 50 wt.% Gly/κ-Cg and 20 wt.% NdTrif₃/κ-Cg (1.03 × 10-4, 3.03 × 10-4, and 1.69 × 10-4 S cm-1 at 30, 60, and 97 °C, respectively). The NdTrif-based κ-Cg membranes are multi-wavelength emitters from the ultraviolet (UV)/visible to the NIR regions, due to the κ-Cg intrinsic emission and to Nd3+, ⁴F3/2→⁴I11/2-9/2.
Collapse
Affiliation(s)
- S C Nunes
- Chemistry Department, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
- Chemistry Department, University of Beira Interior, 6201-001 Covilhã, Portugal.
| | - S M Saraiva
- Chemistry Department, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
| | - R F P Pereira
- Chemistry Department, University of Minho, 4710-057 Braga, Portugal.
| | - M M Silva
- Chemistry Department, University of Minho, 4710-057 Braga, Portugal.
| | - L D Carlos
- Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - P Almeida
- Chemistry Department, University of Beira Interior, 6201-001 Covilhã, Portugal.
- CICS-UBI, University of Beira Interior, 6201-001 Covilhã, Portugal.
| | - M C Gonçalves
- Chemistry Department, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
- CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
| | - R A S Ferreira
- Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - V de Zea Bermudez
- Chemistry Department, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
- CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
| |
Collapse
|
13
|
Barreto JPB, Mello IP, Rizzante FAP, Santos-Júnior JK, Abreu CW, Silva MM. Análise da Resistência Flexural em Resinas à Base de Bisacrilato de Metila. J Health Scie 2018. [DOI: 10.17921/2447-8938.2017v19n5p108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Por exibir propriedades mecânicas apropriadas e um bom custo-benefício, a resina acrílica tem sido o material mais empregado para confecção de coroas provisórias. Todavia, a necessidade de um material provisório que apresente uma melhor estética, maior resistência e maior praticidade de técnica induziram o desenvolvimento das resinas à base de bisacrilato de metila, também denominadas resinas bisacrílicas. Assim, este estudo avaliou a resistência flexural das resinas bisacrílicas Protemp 4 (3M ESPE, BRASIL) e Structur 3 (VOCO, ALEMANHA). Para isso, vinte espécimes de cada material foram confeccionados com auxílio de uma matriz metálica retangular (25 × 2 × 2 mm) e subdivididos em dois grupos (n10): (A) 7 dias de armazenagem em água destilada, e (B) - 3 meses de armazenagem em água destilada. Em seguida, cada amostra foi submetida ao teste de resistência flexural em uma Máquina de Ensaios Universal (Instron3342). Os dados obtidos foram avaliados quanto à normalidade pelo teste de Shapiro Wilk e, posteriormente, à análise de variância (ANOVA) a dois critérios e teste Tukey, todos com nível de significância de 5%. Os resultados revelaram que a resistência flexural da resina bisacrílica Protemp 4 não foi alterada (p>0.05) após 3 meses de armazenagem em água destilada. Enquanto que após esse mesmo período a resina Structur 3 apresentou redução estatisticamente significativa (p<0.05) nos valores de resistência flexural. Sendo assim, foi possível concluir que a resina bisacrílica Structur 3 SC teve sua resistência flexural diminuída após a armazenagem em água destilada.Palavras-chave: Prótese Parcial Temporária. Prótese Dentária. Restauração Dentária Temporária.
Collapse
|
14
|
Gowran A, Kulikova T, Lewis FC, Foldes G, Fuentes L, Viiri LE, Spinelli V, Costa A, Perbellini F, Sid-Otmane C, Bax NAM, Pekkanen-Mattila M, Schiano C, Chaloupka A, Forini F, Sarkozy M, De Jager SCA, Vajen T, Glezeva N, Lee HW, Golovkin A, Kucera T, Musikhina NA, Korzhenkov NP, Santuchi MDEC, Munteanu D, Garcia RG, Ang R, Usui S, Kamilova U, Jumeau C, Aberg M, Kostina DA, Brandt MM, Muntean D, Lindner D, Sadaba R, Bacova B, Nikolov A, Sedmera D, Ryabov V, Neto FP, Lynch M, Portero V, Kui P, Howarth FC, Gualdoni A, Prorok J, Diolaiuti L, Vostarek F, Wagner M, Abela MA, Nebert C, Xiang W, Kloza M, Maslenko A, Grechanyk M, Bhattachariya A, Morawietz H, Babaeva AR, Martinez Sanchez SM, Krychtiuk KA, Starodubova J, Fiorelli S, Rinne P, Ozkaramanli Gur D, Hofbauer T, Starodubova J, Stellos K, Pinon P, Tsoref O, Thaler B, Fraga-Silva RA, Fuijkschot WW, Shaaban MNS, Matthaeus C, Deluyker D, Scardigli M, Zahradnikova A, Dominguez A, Kondrat'eva D, Sosorburam T, Murarikova M, Duerr GD, Griecsova L, Portnichenko VI, Smolina N, Duicu OANAM, Elder JM, Zaglia T, Lorenzon A, Ruperez C, Woudstra L, Suffee N, De Lucia C, Tsoref O, Russell-Hallinan A, Menendez-Montes I, Kapelko VI, Emmens RW, Hetman O, Van Der Laarse WJ, Goncharov S, Adao R, Huisamen B, Sirenko O, Kamilova U, Nassiri I, Tserendavaa SUMIYA, Yushko K, Baldan Martin M, Falcone C, Vigorelli V, Nigro P, Pompilio G, Stepanova O, Valikhov M, Samko A, Masenko V, Tereschenko S, Teoh T, Domenjo-Vila E, Theologou T, Field M, Awad W, Yasin M, Nadal-Ginard B, Ellison-Hughes GM, Hellen N, Vittay O, Harding SE, Gomez-Cid L, Fernandez-Santos ME, Suarez-Sancho S, Plasencia V, Climent A, Sanz-Ruiz R, Hedhammar M, Atienza F, Fernandez-Aviles F, Kiamehr M, Oittinen M, Viiri KM, Kaikkonen M, Aalto-Setala K, Diolaiuti L, Laurino A, Sartiani L, Vona A, Zanardelli M, Cerbai E, Failli P, Hortigon-Vinagre MP, Van Der Heyden M, Burton FL, Smith GL, Watson S, Scigliano M, Tkach S, Alayoubi S, Harding SE, Terracciano CM, Ly HQ, Mauretti A, Van Marion MH, Van Turnhout MC, Van Der Schaft DWJ, Sahlgren CM, Goumans MJ, Bouten CVC, Vuorenpaa H, Penttinen K, Sarkanen R, Ylikomi T, Heinonen T, Aalto-Setala K, Grimaldi V, Aprile M, Esposito R, Maiello C, Soricelli A, Colantuoni V, Costa V, Ciccodicola A, Napoli C, Rowe GC, Johnson K, Arany ZP, Del Monte F, D'aurizio R, Kusmic C, Nicolini G, Baumgart M, Groth M, Ucciferri N, Iervasi G, Pitto L, Pipicz M, Gaspar R, Siska A, Foldesi I, Kiss K, Bencsik P, Thum T, Batkai S, Csont T, Haan JJ, Bosch L, Brans MAD, Van De Weg SM, Deddens JC, Lee SJ, Sluijter JPG, Pasterkamp G, Werner I, Projahn D, Staudt M, Curaj A, Soenmez TT, Simsekyilmaz S, Hackeng TM, Von Hundelshausen P, Koenen RR, Weber C, Liehn EA, Santos-Martinez M, Medina C, Watson C, Mcdonald K, Gilmer J, Ledwidge M, Song SH, Lee MY, Park MH, Choi JC, Ahn JH, Park JS, Oh JH, Choi JH, Lee HC, Cha KS, Hong TJ, Kudryavtsev I, Serebryakova M, Malashicheva A, Shishkova A, Zhiduleva E, Moiseeva O, Durisova M, Blaha M, Melenovsky V, Pirk J, Kautzner J, Petelina TI, Gapon LI, Gorbatenko EA, Potolinskaya YV, Arkhipova EV, Solodenkova KS, Osadchuk MA, Dutra MF, Oliveira FCB, Silva MM, Passos-Silva DG, Goncalves R, Santos RAS, Da Silva RF, Gavrilescu CM, Paraschiv CM, Manea P, Strat LC, Gomez JMG, Merino D, Hurle MA, Nistal JF, Aires A, Cortajarena AL, Villar AV, Abramowitz J, Birnbaumer L, Gourine AV, Tinker A, Takamura M, Takashima S, Inoue O, Misu H, Takamura T, Kaneko S, Alieva TOHIRA, Mougenot N, Dufilho M, Hatem S, Siegbahn A, Kostina AS, Uspensky VE, Moiseeva OM, Kostareva AA, Malashicheva AB, Van Dijk CGM, Chrifi I, Verhaar MC, Duncker DJ, Cheng C, Sturza A, Petrus A, Duicu O, Kiss L, Danila M, Baczko I, Jost N, Gotzhein F, Schon J, Schwarzl M, Hinrichs S, Blankenberg S, Volker U, Hammer E, Westermann D, Martinez-Martinez E, Arrieta V, Fernandez-Celis A, Jimenez-Alfaro L, Melero A, Alvarez-Asiain V, Cachofeiro V, Lopez-Andres N, Tribulova N, Wallukat G, Knezl V, Radosinska J, Barancik M, Tsinlikov I, Tsinlikova I, Nicoloff G, Blazhev A, Pesevski Z, Kvasilova A, Stopkova T, Eckhardt A, Buffinton CM, Nanka O, Kercheva M, Suslova T, Gusakova A, Ryabova T, Markov V, Karpov R, Seemann H, Alcantara TC, Santuchi MDEC, Fonseca SG, Da Silva RF, Barallobre-Barreiro J, Oklu R, Fava M, Baig F, Yin X, Albadawi H, Jahangiri M, Stoughton J, Mayr M, Podliesna SP, Veerman CCV, Verkerk AOV, Klerk MK, Lodder EML, Mengarelli IM, Bezzina CRB, Remme CAR, Takacs H, Polyak A, Morvay N, Lepran I, Tiszlavicz L, Nagy N, Ordog B, Farkas A, Forster T, Varro A, Farkas AS, Jayaprakash P, Parekh K, Ferdous Z, Oz M, Dobrzynski H, Adrian TE, Landi S, Bonzanni M, D'souza A, Boyett M, Bucchi A, Baruscotti M, Difrancesco D, Barbuti A, Kui P, Takacs H, Oravecz K, Hezso T, Polyak A, Levijoki J, Pollesello P, Koskelainen T, Otsomaa L, Farkas AS, Papp JGY, Varro A, Toth A, Acsai K, Dini L, Mazzoni L, Sartiani L, Cerbai E, Mugelli A, Svatunkova J, Sedmera D, Deffge C, Baer C, Weinert S, Braun-Dullaeus RC, Herold J, Cassar AC, Zahra GZ, Pllaha EP, Dingli PD, Montefort SM, Xuereb RGX, Aschacher T, Messner B, Eichmair E, Mohl W, Reglin B, Rong W, Nitzsche B, Maibier M, Guimaraes P, Ruggeri A, Secomb TW, Pries AR, Baranowska-Kuczko M, Karpinska O, Kusaczuk M, Malinowska B, Kozlowska H, Demikhova N, Vynnychenko L, Prykhodko O, Grechanyk N, Kuryata A, Cottrill KA, Du L, Bjorck HM, Maleki S, Franco-Cereceda A, Chan SY, Eriksson P, Giebe S, Cockcroft N, Hewitt K, Brux M, Brunssen C, Tarasov AA, Davidov SI, Reznikova EA, Tapia Abellan A, Angosto Bazarra D, Pelegrin Vivancos P, Montoro Garcia S, Kastl SP, Pongratz T, Goliasch G, Gaspar L, Maurer G, Huber K, Dostal E, Pfaffenberger S, Oravec S, Wojta J, Speidl WS, Osipova I, Sopotova I, Eligini S, Cosentino N, Marenzi G, Tremoli E, Rami M, Ring L, Steffens S, Gur O, Gurkan S, Mangold A, Scherz T, Panzenboeck A, Staier N, Heidari H, Mueller J, Lang IM, Osipova I, Sopotova I, Gatsiou A, Stamatelopoulos K, Perisic L, John D, Lunella FF, Eriksson P, Hedin U, Zeiher A, Dimmeler S, Nunez L, Moure R, Marron-Linares G, Flores X, Aldama G, Salgado J, Calvino R, Tomas M, Bou G, Vazquez N, Hermida-Prieto M, Vazquez-Rodriguez JM, Amit U, Landa N, Kain D, Tyomkin D, David A, Leor J, Hohensinner PJ, Baumgartner J, Krychtiuk KA, Maurer G, Huber K, Baik N, Miles LA, Wojta J, Seeman H, Montecucco F, Da Silva AR, Costa-Fraga FP, Anguenot L, Mach FP, Santos RAS, Stergiopulos N, Da Silva RF, Kupreishvili K, Vonk ABA, Smulders YM, Van Hinsbergh VWM, Stooker W, Niessen HWM, Krijnen PAJ, Ashmawy MM, Salama MA, Elamrosy MZ, Juettner R, Rathjen FG, Bito V, Crocini C, Ferrantini C, Gabbrielli T, Silvestri L, Coppini R, Tesi C, Cerbai E, Poggesi C, Pavone FS, Sacconi L, Mackova K, Zahradnik I, Zahradnikova A, Diaz I, Sanchez De Rojas De Pedro E, Hmadcha K, Calderon Sanchez E, Benitah JP, Gomez AM, Smani T, Ordonez A, Afanasiev SA, Egorova MV, Popov SV, Wu Qing P, Cheng X, Carnicka S, Pancza D, Jasova M, Kancirova I, Ferko M, Ravingerova T, Wu S, Schneider M, Marggraf V, Verfuerth L, Frede S, Boehm O, Dewald O, Baumgarten G, Kim SC, Farkasova V, Gablovsky I, Bernatova I, Ravingerova T, Nosar V, Portnychenko A, Drevytska T, Mankovska I, Gogvadze V, Sejersen T, Kostareva A, Sturza A, Wolf A, Privistirescu A, Danila M, Muntean D, O ' Gara P, Sanchez-Alonso JL, Harding SE, Lyon AR, Prando V, Pianca N, Lo Verso F, Milan G, Pesce P, Sandri M, Mongillo M, Beffagna G, Poloni G, Dazzo E, Sabatelli P, Doliana R, Polishchuk R, Carnevale D, Lembo G, Bonaldo P, Braghetta P, Rampazzo A, Cairo M, Giralt M, Villarroya F, Planavila A, Biesbroek PS, Emmens RWE, Juffermans LJM, Van Der Wall AC, Van Rossum AC, Niessen JWM, Krijnen PAJ, Moor Morris T, Dilanian G, Farahmand P, Puceat M, Hatem S, Gambino G, Petraglia L, Elia A, Komici K, Femminella GD, D'amico ML, Pagano G, Cannavo A, Liccardo D, Koch WJ, Nolano M, Leosco D, Ferrara N, Rengo G, Amit U, Landa N, Kain D, Leor J, Neary R, Shiels L, Watson C, Baugh J, Palacios B, Escobar B, Alonso AV, Guzman G, Ruiz-Cabello J, Jimenez-Borreguero LJ, Martin-Puig S, Lakomkin VL, Lukoshkova EV, Abramov AA, Gramovich VV, Vyborov ON, Ermishkin VV, Undrovinas NA, Shirinsky VP, Smilde BJ, Woudstra L, Fong Hing G, Wouters D, Zeerleder S, Murk JL, Van Ham SM, Heymans S, Juffermans LJM, Van Rossum AC, Niessen JWM, Krijnen PAJ, Krakhmalova O, Van Groen D, Bogaards SJP, Schalij I, Portnichenko GV, Tumanovska LV, Goshovska YV, Lapikova-Bryhinska TU, Nagibin VS, Dosenko VE, Mendes-Ferreira P, Maia-Rocha C, Santos-Ribeiro D, Potus F, Breuils-Bonnet S, Provencher S, Bonnet S, Rademaker M, Leite-Moreira AF, Bras-Silva C, Lopes J, Kuryata O, Lusynets T, Alikulov I, Nourddine M, Azzouzi L, Habbal R, Tserendavaa SUMIYA, Enkhtaivan ODKHUU, Enkhtaivan ODKHUU, Shagdar ZORIGO, Shagdar ZORIGO, Malchinkhuu MUNKHZ, Malchinkhuu MUNLHZ, Koval S, Starchenko T, Mourino-Alvarez L, Gonzalez-Calero L, Sastre-Oliva T, Lopez JA, Vazquez J, Alvarez-Llamas G, Ruilope LUISM, De La Cuesta F, Barderas MG, Bozzini S, D'angelo A, Pelissero G. Poster session 3Cell growth, differentiation and stem cells - Heart511The role of the endocannabinoid system in modelling muscular dystrophy cardiac disease with induced pluripotent stem cells.512An emerging role of T lymphocytes in cardiac regenerative processes in heart failure due to dilated cardiomyopathy513Canonical wnt signaling reverses the ‘aged/senescent’ human endogenous cardiac stem cell phenotype514Hippo signalling modulates survival of human induced pluripotent stem cell-derived cardiomyocytes515Biocompatibility of mesenchymal stem cells with a spider silk matrix and its potential use as scaffold for cardiac tissue regeneration516A snapshot of genome-wide transcription in human induced pluripotent stem cell-derived hepatocyte-like cells (iPSC-HLCs)517Can NOS/sGC/cGK1 pathway trigger the differentiation and maturation of mouse embryonic stem cells (ESCs)?518Introduction of external Ik1 to human-induced pluripotent stem cell-derived cardiomyocytes via Ik1-expressing HEK293519Cell therapy of the heart studied using adult myocardial slices in vitro520Enhancement of the paracrine potential of human adipose derived stem cells when cultured as spheroid bodies521Mechanosensitivity of cardiomyocyte progenitor cells: the strain response in 2D and 3D environments522The effect of the vascular-like network on the maturation of the human induced pluripotent stem cell derived cardiomyocytes.Transcriptional control and RNA species - Heart525Gene expression regulation in heart failure: from pathobiology to bioinformatics526Human transcriptome in idiopathic dilated cardiomyopathy - a novel high throughput screening527A high-throghput approach unveils putative miRNA-mediated mitochondria-targeted cardioprotective circuits activated by T3 in the post ischemia reperfusion setting528The effect of uraemia on the expression of miR-212/132 and the calcineurin pathway in the rat heartCytokines and cellular inflammation - Heart531Lack of growth differentiation factor 15 aggravates adverse cardiac remodeling upon pressure-overload in mice532Blocking heteromerization of platelet chemokines ccl5 and cxcl4 reduces inflammation and preserves heart function after myocardial infarction533Is there an association between low-dose aspirin use and clinical outcome in HFPEF? Implications of modulating monocyte function and inflammatory mediator release534N-terminal truncated intracellular matrix metalloproteinase-2 expression in diabetic heart.535Expression of CD39 and CD73 on peripheral T-cell subsets in calcific aortic stenosis536Mast cells in the atrial myocardium of patients with atrial fibrillation: a comparison with patients in sinus rhythm539Characteristics of the inflammatory response in patients with coronary artery disease and arterial hypertension540Pro-inflammatory cytokines as cardiovascular events predictors in rheumatoid arthritis and asymptomatic atherosclerosis541Characterization of FVB/N murinic bone marrow-derived macrophage polarization into M1 and M2 phenotypes542The biological expression and thoracic anterior pain syndromeSignal transduction - Heart545The association of heat shock protein 90 and TGFbeta receptor I is involved in collagen production during cardiac remodelling in aortic-banded mice546Loss of the inhibitory GalphaO protein in the rostral ventrolateral medulla of the brainstem leads to abnormalities in cardiovascular reflexes and altered ventricular excitablitiy547Selenoprotein P regulates pressure overload-induced cardiac remodeling548Study of adenylyl cyclase activity in erythrocyte membranes in patients with chronic heart failure549Direct thrombin inhibitors inhibit atrial myocardium hypertrophy in a rat model of heart failure and atrial remodeling550Tissue factor / FVIIa transactivates the IGF-1R by a Src-dependent phosphorylation of caveolin-1551Notch signaling is differently altered in endothelial and smooth muscle cells of ascending aortic aneurysm patients552Frizzled 5 expression is essential for endothelial proliferation and migration553Modulation of vascular function and ROS production by novel synthetic benzopyran analogues in diabetes mellitusExtracellular matrix and fibrosis - Heart556Cardiac fibroblasts as inflammatory supporter cells trigger cardiac inflammation in heart failure557A role for galectin-3 in calcific aortic valve stenosis558Omega-3 polyunsaturated fatty acids- can they decrease risk for ventricular fibrillation?559Serum levels of elastin derived peptides and circulating elastin-antielastin immune complexes in sera of patients with coronary artery disease560Endocardial fibroelastosis is secondary to hemodynamic alterations in the chick model of hypoplastic left heart syndrome561Dynamics of serum levels of matrix metalloproteinases in primary anterior STEMI patients564Deletion of the alpha-7 nicotinic acetylcholine receptor changes the vascular remodeling induced by transverse aortic constriction in mice.565Extracellular matrix remodelling in response to venous hypertension: proteomics of human varicose veinsIon channels, ion exchangers and cellular electrophysiology - Heart568Microtubule-associated protein RP/EB family member 1 modulates sodium channel trafficking and cardiac conduction569Investigation of electrophysiological abnormalities in a rabbit athlete's heart model570Upregulation of expression of multiple genes in the atrioventricular node of streptozotocin-induced diabetic rat571miR-1 as a regulator of sinoatrial rhythm in endurance training adaptation572Selective sodium-calcium exchanger inhibition reduces myocardial dysfunction associated with hypokalaemia and ventricular fibrillation573Effect of racemic and levo-methadone on action potential of human ventricular cardiomyocytes574Acute temperature effects on the chick embryonic heart functionVasculogenesis, angiogenesis and arteriogenesis577Clinical improvement and enhanced collateral vessel growth after monocyte transplantation in mice578The role of HIF-1 alpha, VEGF and obstructive sleep apnoea in the development of coronary collateral circulation579Initiating cardiac repair with a trans-coronary sinus catheter intervention in an ischemia/reperfusion porcine animal model580Early adaptation of pre-existing collaterals after acute arteriolar and venular microocclusion: an in vivo study in chick chorioallantoic membraneEndothelium583EDH-type responses to the activator of potassium KCa2.3 and KCa3.1 channels SKA-31 in the small mesenteric artery from spontaneously hypertensive rats584The peculiarities of endothelial dysfunction in patients with chronic renocardial syndrome585Endothelial dysfunction, atherosclerosis of the carotid arteries and level of leptin in patient with coronary heart disease in combination with hepatic steatosis depend from body mass index.586Role of non-coding RNAs in thoracic aortic aneurysm associated with bicuspid aortic valve587Cigarette smoke extract abrogates atheroprotective effects of high laminar flow on endothelial function588The prognostic value of anti-connective tissue antibodies in coronary heart disease and asymptomatic atherosclerosis589Novel potential properties of bioactive peptides from spanish dry-cured ham on the endothelium.Lipids592Intermediate density lipoprotein is associated with monocyte subset distribution in patients with stable atherosclerosis593The characteristics of dyslipidemia in rheumatoid arthritisAtherosclerosis596Macrophages differentiated in vitro are heterogeneous: morphological and functional profile in patients with coronary artery disease597Palmitoylethanolamide promotes anti-inflammatory phenotype of macrophages and attenuates plaque formation in ApoE-/- mice598Amiodarone versus esmolol in the perioperative period: an in vitro study of coronary artery bypass grafts599BMPRII signaling of fibrocytes, a mesenchymal progenitor cell population, is increased in STEMI and dyslipidemia600The characteristics of atherogenesis and systemic inflammation in rheumatoid arthritis601Role of adenosine-to-inosine RNA editing in human atherosclerosis602Presence of bacterial DNA in thrombus aspirates of patients with myocardial infarction603Novel E-selectin binding polymers reduce atherosclerotic lesions in ApoE(-/-) mice604Differential expression of the plasminogen receptor Plg-RKT in monocyte and macrophage subsets - possible functional consequences in atherogenesis605Apelin-13 treatment enhances the stability of atherosclerotic plaques606Mast cells are increased in the media of coronary lesions in patients with myocardial infarction and favor atherosclerotic plaque instability607Association of neutrophil to lymphocyte ratio with presence of isolated coronary artery ectasiaCalcium fluxes and excitation-contraction coupling610The coxsackie- and adenovirus receptor (CAR) regulates calcium homeostasis in the developing heart611HMW-AGEs application acutely reduces ICaL in adult cardiomyocytes612Measuring electrical conductibility of cardiac T-tubular systems613Postnatal development of cardiac excitation-contraction coupling in rats614Role of altered Ca2+ homeostasis during adverse cardiac remodeling after ischemia/reperfusion615Experimental study of sarcoplasmic reticulum dysfunction and energetic metabolism in failing myocardium associated with diabetes mellitusHibernation, stunning and preconditioning618Volatile anesthetic preconditioning attenuates ischemic-reperfusion injury in type II diabetic patients undergoing on-pump heart surgery619The effect of early and delayed phase of remote ischemic preconditioning on ischemia-reperfusion injury in the isolated hearts of healthy and diabetic rats620Post-conditioning with 1668-thioate leads to attenuation of the inflammatory response and remodeling with less fibrosis and better left ventricular function in a murine model of myocardial infarction621Maturation-related changes in response to ischemia-reperfusion injury and in effects of classical ischemic preconditioning and remote preconditioningMitochondria and energetics624Phase changes in myocardial mitochondrial respiration caused by hypoxic preconditioning or periodic hypoxic training625Desmin mutations depress mitochondrial metabolism626Methylene blue modulates mitochondrial function and monoamine oxidases-related ROS production in diabetic rat hearts627Doxorubicin modulates the real-time oxygen consumption rate of freshly isolated adult rat and human ventricular cardiomyocytesCardiomyopathies and fibrosis630Effects of genetic or pharmacologic inhibition of the ubiquitin/proteasome system on myocardial proteostasis and cardiac function631Suppression of Wnt signalling in a desmoglein-2 transgenic mouse model for arrhythmogenic cardiomyopathy632Cold-induced cardiac hypertrophy is reversed after thermo-neutral deacclimatization633CD45 is a sensitive marker to diagnose lymphocytic myocarditis in endomyocardial biopsies of living patients and in autopsies634Atrial epicardial adipose tissue derives from epicardial progenitors635Caloric restriction ameliorates cardiac function, sympathetic cardiac innervation and beta-adrenergic receptor signaling in an experimental model of post-ischemic heart failure636High fat diet improves cardiac remodelling and function after extensive myocardial infarction in mice637Epigenetic therapy reduces cardiac hypertrophy in murine models of heart failure638Imbalance of the VHL/HIF signaling in WT1+ Epicardial Progenitors results in coronary vascular defects, fibrosis and cardiac hypertrophy639Diastolic dysfunction is the first stage of the developing heart failure640Colchicine aggravates coxsackievirus B3 infection in miceArterial and pulmonary hypertension642Osteopontin as a marker of pulmonary hypertension in patients with coronary heart disease combined with chronic obstructive pulmonary disease643Myocardial dynamic stiffness is increased in experimental pulmonary hypertension partly due to incomplete relaxation644Hypotensive effect of quercetin is possibly mediated by down-regulation of immunotroteasome subunits in aorta of spontaneously hypertensive rats645Urocortin-2 improves right ventricular function and attenuates experimental pulmonary arterial hypertension646A preclinical evaluation of the anti-hypertensive properties of an aqueous extract of Agathosma (Buchu)Biomarkers648The adiponectin level in hypertensive females with rheumatoid arthritis and its relationship with subclinical atherosclerosis649Markers for identification of renal dysfunction in the patients with chronic heart failure650cardio-hepatic syndromes in chronic heart failure: North Africa profile651To study other biomarkers that assess during myocardial infarction652Interconnections of apelin levels with parameters of lipid metabolism in hypertension patients653Plasma proteomics in hypertension: prediction and follow-up of albuminuria during chronic renin-angiotensin system suppression654Soluble RAGE levels in plasma of patients with cerebrovascular events. Cardiovasc Res 2016. [DOI: 10.1093/cvr/cvw150] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
15
|
Formagio ASN, Ramos DD, Vieira MC, Ramalho SR, Silva MM, Zárate NAH, Foglio MA, Carvalho JE. Phenolic compounds of Hibiscus sabdariffa and influence of organic residues on its antioxidant and antitumoral properties. BRAZ J BIOL 2016; 75:69-76. [PMID: 25945622 DOI: 10.1590/1519-6984.07413] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 09/03/2013] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the phenolic and flavonoids contents and the antioxidant and antitumoral activity of leaf and calyx methanolic extracts from Hibiscus sabdariffa (roselle) cultivated with poultry litter and organosuper® under three modes of application. The total phenolic content in the each extract was determined using the Folin-Ciocalteu reagent and for aluminium chloride flavonoids. The antioxidant parameters were analyzed using a 2, 2-diphenyl-1-picrylhydrazyl (DPPH.) free radical scavenging assay. An antitumor colorimetric assay using sulforhodamine B. The highest contents of phenolic and flavonoids were observed in leaf extracts (389.98 and 104.52 mg g-1, respectively) and calyx extracts (474.09 and 148.35 mg g-1, respectively) from plants cultivated with organosuper®, although these values did not differ significantly from those observed for the other treatments. The average IC50 of leaves (43.48 μg mL-1) and calyces (37.15 μg mL-1) demonstrated that both have substances that may contribute to free radical scavenging action. The methanol extract from calyces showed significant selective activity against a leukemia line (K-562), with IC50 values of 0.12 mg mL-1 (organosuper®) and 1.16 mg mL-1 (poultry litter), with concentration-dependent, cytotoxic and cytocidal effects.
Collapse
Affiliation(s)
- A S N Formagio
- Facudade de Ciências Agrárias, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - D D Ramos
- Facudade de Ciências Agrárias, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - M C Vieira
- Facudade de Ciências Agrárias, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - S R Ramalho
- Faculdade de Ciências Biológicas e Ambientais, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - M M Silva
- Faculdade de Ciências Biológicas e Ambientais, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - N A H Zárate
- Facudade de Ciências Agrárias, Universidade Federal da Grande Dourados, Dourados, MS, Brazil
| | - M A Foglio
- Centro Pluridisciplinar de Pesquisas Químicas, Biológicas e Agrícolas, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - J E Carvalho
- Centro Pluridisciplinar de Pesquisas Químicas, Biológicas e Agrícolas, Universidade Estadual de Campinas, Campinas, SP, Brazil
| |
Collapse
|
16
|
Azevedo JR, Montenegro WS, Leitao AL, Silva MM, Prazeres JS, Maranhao JP. High flow nasal cannula oxygen (hfnc) versus non-invasive positive pressure ventilation (nippv) in acute hypoxemic respiratory failure. a pilot randomized controlled trial. Intensive Care Med Exp 2015. [PMCID: PMC4796500 DOI: 10.1186/2197-425x-3-s1-a166] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
17
|
van Tilburg MF, Salles MGF, Silva MM, Moreira RA, Moreno FB, Monteiro-Moreira ACO, Martins JAM, Cândido MJD, Araújo AA, Moura AAA. Semen variables and sperm membrane protein profile of Saanen bucks (Capra hircus) in dry and rainy seasons of the northeastern Brazil (3°S). Int J Biometeorol 2015; 59:561-573. [PMID: 25086569 DOI: 10.1007/s00484-014-0869-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 07/01/2014] [Accepted: 07/02/2014] [Indexed: 06/03/2023]
Abstract
The Saanen is a highly productive breed, and for this reason, it has been raised in Brazil, but mostly under climate conditions completely different from where the breed originated. The objective of this study was to investigate variations in semen parameters and sperm membrane proteins from Saanen bucks (n = 7) raised in Northeastern Brazil, during dry season (September, October, and November) and rainy season (March, April, and May). We showed that during the dry season, sperm motility, concentration, and the percentage of normal sperm decreased as compared to the rainy season. Rectal temperatures of bucks had no significant (p > 0.05) variations during the dry and rainy seasons. However, temperatures of left and right skin testis were higher (p < 0.05) during the dry as compared to the rainy season. Expression of three proteins (lysine-specific demethylase 5D, adenosine triphosphate (ATP) synthase subunit d, and radial spoke head protein 9 homolog) in sperm membrane were more intense in rainy season and only one protein (cytosol aminopeptidase) had greater expression in the dry season of the year. Our results show that mechanisms of testicular thermoregulation of Saanen bucks did not prevent a decrease in seminal parameters during the dry season. This deterioration may be related to reduced expression of proteins associated with important functions in sperm membrane.
Collapse
Affiliation(s)
- M F van Tilburg
- Department of Animal Science, Federal University of Ceará, Av. Mister Hull S/N, Campus Pici, Fortaleza, CE, Brazil, 60021-970
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Leones R, Fernandes M, Ferreira RAS, Cesarino I, Lima JF, Carlos LD, Bermudez VDZ, Magon CJ, Donoso JP, Silva MM, Pawlicka A. Luminescent DNA- and agar-based membranes. J Nanosci Nanotechnol 2014; 14:6685-6691. [PMID: 25924317 DOI: 10.1166/jnn.2014.9368] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Luminescent materials containing europium ions are investigated for different optical applications. They can be obtained using bio-macromolecules, which are promising alternatives to synthetic polymers based on the decreasing oil resources. This paper describes studies of the DNA- and Agar-europium triflate luminescent membranes and its potential technological applications are expanded to electroluminescent devices. Polarized optical microscopy demonstrated that the samples are birefringent with submicrometer anisotropy. The X-ray diffraction analysis revealed predominantly amorphous nature of the samples and the atomic force microscopy images showed a roughness of the membranes of 409.0 and 136.1 nm for the samples of DNA10Eu and Agar1.11Eu, respectively. The electron paramagnetic resonance spectra of the DNA(n)Eu membranes with the principal lines at g ≈ 2.0 and g ≈ 4.8 confirmed uniform distribution of rare earth ions in a disordered matrix. Moreover, these strong and narrow resonance lines for the samples of DNA(n)Eu when compared to the Agar(n)Eu suggested a presence of paramagnetic radicals arising from the DNA matrix. The emission spectra suggested that the Eu3+ ions occupy a single local environment in both matrices and the excitation spectra monitored around the Eu emission lines pointed out that the Eu3+ ions in the Agar host were mainly excited via the broad band component rather than by direct intra-4f(6) excitation, whereas the opposite case occurred for the DNA-based sample.
Collapse
|
19
|
Raju BR, Sampaio DMF, Silva MM, Coutinho PJG, Gonçalves MST. Ultrasound promoted synthesis of Nile Blue derivatives. Ultrason Sonochem 2014; 21:360-366. [PMID: 23769749 DOI: 10.1016/j.ultsonch.2013.05.010] [Citation(s) in RCA: 8] [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: 03/08/2013] [Revised: 04/17/2013] [Accepted: 05/15/2013] [Indexed: 06/02/2023]
Abstract
Ultrasound irradiation was used for the first time towards the synthesis of new Nile Blue related benzo[a]phenoxazinium chlorides possessing isopentylamino, (2-cyclohexylethyl)amino and phenethylamino groups at 5-position of the heterocyclic system. The efficacy of sonochemistry was investigated with some of our earlier reported synthesis of benzo[a]phenoxazinium chlorides. This newer protocol proved competent in terms of reaction times and enhanced yields. Photophysical studies carried out in ethanol, water and simulated physiological conditions, revealed that emission maxima occurred in the range 644-656 nm, with high fluorescent quantum yields. Other attractive feature exhibited by these materials includes good thermal stability. These properties might be useful in the development of fluorescent probes for biotechnology.
Collapse
Affiliation(s)
- B Rama Raju
- Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Centre of Chemistry, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | | | | | | | | |
Collapse
|
20
|
Silva MM, Lemos JM, Coito A, Costa BA, Wigren T, Mendonça T. Local identifiability and sensitivity analysis of neuromuscular blockade and depth of hypnosis models. Comput Methods Programs Biomed 2013; 113:23-36. [PMID: 24252467 DOI: 10.1016/j.cmpb.2013.07.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 07/05/2012] [Revised: 06/22/2013] [Accepted: 07/20/2013] [Indexed: 06/02/2023]
Abstract
This paper addresses the local identifiability and sensitivity properties of two classes of Wiener models for the neuromuscular blockade and depth of hypnosis, when drug dose profiles like the ones commonly administered in the clinical practice are used as model inputs. The local parameter identifiability was assessed based on the singular value decomposition of the normalized sensitivity matrix. For the given input signal excitation, the results show an over-parameterization of the standard pharmacokinetic/pharmacodynamic models. The same identifiability assessment was performed on recently proposed minimally parameterized parsimonious models for both the neuromuscular blockade and the depth of hypnosis. The results show that the majority of the model parameters are identifiable from the available input-output data. This indicates that any identification strategy based on the minimally parameterized parsimonious Wiener models for the neuromuscular blockade and for the depth of hypnosis is likely to be more successful than if standard models are used.
Collapse
Affiliation(s)
- M M Silva
- Departamento de Matemática, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal; Division of Systems and Control, Department of Information Technology, Uppsala University, Box 337, SE-751 05 Uppsala, Sweden; Center for Research and Development in Mathematics and Applications (CIDMA), Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | | | | | | | | | | |
Collapse
|
21
|
Silva MM, Da Fonseca CO, Moura-Neto R, Carvalho JF, Quirico-Santos T, Carvalho MG. Influence of GSTM1 and GSTT1 polymorphisms on the survival rate of patients with malignant glioma under perillyl alcohol-based therapy. Genet Mol Res 2013; 12:1621-30. [PMID: 23765968 DOI: 10.4238/2013.may.14.2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
GSTM1 (glutathione S-transferase mu 1) and GSTT1 (glutathione S-transferase theta 1) are critical enzymes for detoxification of endogenous and environmental carcinogens. Constitutive GST gene polymorphisms may be associated with increased risk for cancer development. We made an explorative study of a Brazilian population with malignant glioma to determine whether GSTM1 and GSTT1 genetic polymorphisms influence the response to intranasal administration of perillyl alcohol and the survival rate. Patients were stratified into groups according to clinical presentation, tumor classification, and tumor location. Circulating DNA was extracted from blood plasma or serum, and genotypes were detected by multiplex PCR. The cohort included 95 patients with recurrent malignant glioma included in a Phase I/II clinical trial with perillyl alcohol and 100 matched healthy control subjects. GSTM1 frequency was similar in patients with glioma (44%) and healthy controls (54%), but GSTT1 deletion was found in 11.5% patients, contrasting with 36% in controls. A longer survival rate was associated with a lack of GSTM1 deletion (31 weeks) and a deletion for GSTT1 (28 weeks). A poor survival rate was associated with GSTM1 deletion (23 weeks) and with a lack of a GSTT1 deletion (19 weeks). A significantly lower frequency of GSTT1 deletion in glioma patients compared to healthy controls indicates that GSTT1 deletion may exert a protective role against gliomagenesis, influence therapeutic response to intranasal perillyl alcohol treatment, and increase overall survival, especially considering tumor topography.
Collapse
Affiliation(s)
- M M Silva
- Laboratório de Controle da Expressão Gênica, Instituto de Biofísica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | | | | | | | | | | |
Collapse
|
22
|
Abstract
The hydrolysis of flucloxacillin at pH 4.9 yields a degradation product which is polarographically oxidizable. This derivative has not been identified, but would seem to contain a thiol group. It gives a diffusion-controlled anodic polarographic wave with a half-wave potential at -0.24 V vs. SCE. The method developed has been applied to the analysis of flucloxacillin capsules, and a recovery of 99% has been obtained.
Collapse
Affiliation(s)
- J A Squella
- Department of Chemical Pharmacology and Physical Chemistry, Faculty of Chemical and Pharmacological Sciences, P.O. Box 233, Santiago, Chile
| | | | | |
Collapse
|
23
|
Fernandes M, Nobre SS, Rodrigues LC, Gonçalves A, Rego R, Oliveira MC, Ferreira RAS, Fortunato E, Silva MM, Carlos LD, Bermudez VDZ. Li(+)- and Eu(³+)-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes for electrochromic devices. ACS Appl Mater Interfaces 2011; 3:2953-2965. [PMID: 21774498 DOI: 10.1021/am200391b] [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] [Indexed: 05/31/2023]
Abstract
The sol-gel process has been successfully combined with the "mixed cation" effect to produce novel luminescent and ion conducting biohybrids composed of a diurethane cross-linked poly(ε-caprolactone) (PCL530)/siloxane hybrid network (PCL stands for the poly(ε-caprolactone) biopolymer and 530 is the average molecular weight in gmol(-1)) doped with a wide range of concentrations of lithium and europium triflates (LiCF(3)SO(3) and Eu(CF(3)SO(3))(3), respectively) (molar ratio of ca. 50:50). The hybrid samples are all semicrystalline: whereas at n = 52.6 and 27.0 (n, composition, corresponds to the number of (C(═O)(CH(2))(5)O) repeat units of PCL(530) per mixture of Li(+) and Eu(3+) ions) a minor proportion of crystalline PCL(530) chains is present, at n = 6.1, a new crystalline phase emerges. The latter electrolyte is thermally stable up to 220 °C and exhibits the highest conductivity over the entire range of temperatures studied (3.7 × 10(-7) and 1.71 × 10(-4) S cm(-1) at 20 and 102 °C, respectively). According to infrared spectroscopic data, major modifications occur in terms of hydrogen bonding interactions at this composition. The electrochemical stability domain of the biohybrid sample with n = 27 spans more than 7 V versus Li/Li(+). This sample is a room temperature white light emitter. Its emission color can be easily tuned across the Commission Internationale d'Éclairage (CIE) chromaticity diagram upon simply changing the excitation wavelength. Preliminary tests performed with a prototype electrochromic device (ECD) comprising the sample with n = 6.1 as electrolyte and WO(3) as cathodically coloring layer are extremely encouraging. The device exhibits switching time around 50 s, an optical density change of 0.15, good open circuit memory under atmospheric conditions (ca. 1 month) and high coloration efficiency (577 cm(2) C(-1) in the second cycle).
Collapse
Affiliation(s)
- M Fernandes
- Department of Chemistry and CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Gibelli NEM, Tannuri ACA, Tannuri U, Santos MM, Pinho-Apezzato ML, Maksoud-Filho JG, Velhote MCP, Ayoub AAR, Silva MM, Andrade WC. Rex shunt for acute portal vein thrombosis after pediatric liver transplantation in children with biliary atresia. Transplant Proc 2011; 43:194-5. [PMID: 21335186 DOI: 10.1016/j.transproceed.2010.11.011] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND/PURPOSE Posttransplantation portal vein thrombosis (PVT) can have severe health consequences, and portal hypertension and other consequences of the long-term privation of portal inflow to the graft may be hazardous, especially in young children. The Rex shunt has been used successfully to treat PVT patients since 1998. In 2007, we started to perform this surgery in patients with idiopathic PVT and late posttransplantation PVT. Herein we have reported our experience with this technique in acute posttransplantation PVT. METHODS Three patients of ages 12, 15, and 18 months underwent cadaveric (n = 1) or living donor (n = 2) orthotopic liver transplantation (OLT). All patients had biliary atresia with portal vein hypoplasia; they developed acute PVT on the first postoperative day. They underwent a mesenteric-portal surgical shunt (Rex shunt) using a left internal jugular vein autograft (n = 2) or cadaveric iliac vein graft (n = 1) on the first postoperative day. RESULTS The 8-month follow-up has confirmed shunt patency by postoperative Doppler ultrasound. There have been no biliary complications to date. CONCLUSIONS The mesenteric-portal shunt (Rex shunt) using an autograft of the left internal jugular or a cadaveric vein graft should be considered for children with acute PVT after OLT. These children usually have small portal veins; reanastomosis is often unsuccessful. In addition, this technique has the advantage to avoid manipulation of the hepatic hilum and biliary anastomosis. Although this study was based on a limited experience, we concluded that this technique is feasible, with great benefits to and low risks for these patients.
Collapse
Affiliation(s)
- N E M Gibelli
- Department of Pediatrics, Pediatric Surgery and Liver Transplantation Division, Instituto da Criança, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Silva MM, Simões RT, Castelli EC, Mendes-Junior CT, Deghaide NHS, Tsuda LC, Machado AA, Donadi EA, Fernandes APM. TNF microsatellite alleles may confer protection against the development of lipodystrophy syndrome in Brazilian HIV patients. Int J Immunogenet 2010; 37:379-85. [PMID: 20518840 DOI: 10.1111/j.1744-313x.2010.00937.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The aim of this study was to evaluate the frequency of TNFa-e microsatellites and the promoter region (TNF-308 and TNF-238) in HIV/AIDS-infected patients presenting or not lipodystrophy syndrome (LS). The design is the genetic case-control association study. Microsatellite and the TNF promoter region polymorphisms were amplified by PCR and submitted to polyacrylamide gel electrophoresis. The genotypes and allele frequencies for 67 HIV-positive patients with lipodystrophy were compared with 50 HIV-positive patients with no evidence of lipodystrophy and with 131 healthy HIV-negative individuals. The presence of the TNFa5 allele could provide HIV/AIDS patients with protection against developing LS. The presence of TNF-308G allele, as well as of its homozygote TNF-308GG, were associated with susceptibility to developing LS. In addition, the presence of the haplotype TNFe3-d3-238G-308A-c1-a5-b7 suggests protection against developing that syndrome. This study highlights that polymorphic sites spanning the region nearby the TNF locus are associated with LS development in HIV/AIDS patients.
Collapse
Affiliation(s)
- M M Silva
- Department of General and Specialized Nursing, College of Nursing of Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Castelar L, Silva MM, Castelli EC, Deghaide NHS, Mendes-Junior CT, Machado AA, Donadi EA, Fernandes APM. Interleukin-18 and interferon-gamma polymorphisms in Brazilian human immunodeficiency virus-1-infected patients presenting with lipodystrophy syndrome. ACTA ACUST UNITED AC 2010; 76:126-30. [PMID: 20331838 DOI: 10.1111/j.1399-0039.2010.01471.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cytokines play important roles in the pathogenesis of lipodystrophy syndrome (LS). Single nucleotide polymorphisms (SNPs) at positions -607(C/A) and -137(C/G) in the promoter region of the interleukin-18 (IL-18) gene and at position +874(T/A) of the interferon-gamma (IFN-gamma) gene are related to the expression of these cytokines. To examine whether IL-18 and IFN-gamma polymorphisms are associated with LS, these SNPs were genotyped in 88 human immunodeficiency virus (HIV)-infected patients presenting LS, 79 HIV-infected without LS, and 133 healthy controls. The -607A allele, -607AA genotype, and -137G/-607A and -137C/-607A haplotypes in the IL-18 gene were over-represented in HIV patients presenting LS. The -137G/-607C haplotype was associated with protection against LS. These results indicate that the -607(C/A) SNP is associated with LS development in HIV-infected patients.
Collapse
Affiliation(s)
- L Castelar
- College of Nursing of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Stopiglia RM, Ferreira U, Silva MM, Matheus WE, Denardi F, Reis LO. Prostate specific antigen decrease and prostate cancer diagnosis: antibiotic versus placebo prospective randomized clinical trial. J Urol 2010; 183:940-4. [PMID: 20089269 DOI: 10.1016/j.juro.2009.11.044] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Indexed: 10/19/2022]
Abstract
PURPOSE Prostate inflammation can lead to an increase in serum prostate specific antigen concentration and confound the use of prostate specific antigen kinetics. Repeat prostate specific antigen measurements after a period of observation or a course of empirical antibiotics are controversial in terms of the optimal approach to reduce the confounding impact on prostate cancer screening. This issue was analyzed in patients with a diagnosis of type IV or asymptomatic prostatitis (National Institutes of Health classification) and high prostate specific antigen. MATERIALS AND METHODS We studied 200 men between 50 and 75 years old with a high prostate specific antigen (between 2.5 and 10 ng/dl). Of these patients 98 (49%) had a diagnosis of type IV prostatitis. In a prospective, double-blind trial they were randomized to receive placebo (49 patients, group 1) or 500 mg ciprofloxacin (49 patients, group 2) twice a day for 4 weeks. Prostate specific antigen was determined after treatment and all patients underwent transrectal ultrasound guided biopsy of the prostate. RESULTS In group 1, 29 (59.18%) patients presented with a decrease in prostate specific antigen and 9 (31%) had cancer on biopsy, while in group 2 there were 26 (53.06%) patients with a decrease in prostate specific antigen and 7 (26.9%) with prostate cancer. There was no statistical difference in either group in relation to prostate specific antigen decrease after treatment or the presence of tumor. CONCLUSIONS A considerable number of patients (49%) were diagnosed with type IV prostatitis and high prostate specific antigen in agreement with the current literature. Of the patients 26.9% to 31% presented with a decrease in prostate specific antigen after the use of antibiotic or placebo and harbor cancer as demonstrated on prostate biopsy. Prostate specific antigen decreases do not indicate the absence of prostate cancer.
Collapse
Affiliation(s)
- R M Stopiglia
- Section of Urologic Oncology, Discipline of Urology, State University of Campinas, Campinas, Brazil
| | | | | | | | | | | |
Collapse
|
28
|
Wasserman MA, Bartoly F, Viana AG, Silva MM, Rochedo ERR, Perez DV, Conti CC. Soil to plant transfer of 137Cs and 60Co in Ferralsol, Nitisol and Acrisol. J Environ Radioact 2008; 99:546-53. [PMID: 17905488 DOI: 10.1016/j.jenvrad.2007.08.010] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 10/15/2006] [Revised: 07/06/2007] [Accepted: 08/09/2007] [Indexed: 05/17/2023]
Abstract
In this study, soil to plant transfer factor values were determined for 137Cs and 60Co in radish (Raphanus sativus), maize (Zea mays L.) and cabbage (Brassica oleracea L. var. capitata) growing in gibbsite-, kaolinite- and iron-oxide-rich soils. After 3 years of experiment in lysimeters it was possible to identify the main soil properties able to modify the soil to plant transfer processes, e.g. exchangeable K and pH, for 137Cs, and organic matter for 60Co. Results of sequential chemical extraction were coherent with root uptake and allowed the recognition of the role of iron oxides on 137Cs behaviour and of Mn oxides on 60Co behaviour. This information should provide support for adequate choices of countermeasures to be applied on tropical soils in case of accident or for remediation purposes.
Collapse
Affiliation(s)
- M A Wasserman
- Instituto de Radioproteção e Dosimetria, CNEN, Av. Salvador Allende s/n(degree), Recreio, CEP: 22780-160, Rio de Janeiro, RJ, Brazil.
| | | | | | | | | | | | | |
Collapse
|
29
|
Abstract
The perception of natural scenes relies on the integration of pre-existing knowledge with the immediate results of attentional processing, and what can be remembered from a scene depends in turn on how that scene is perceived and understood. However, there are conflicting results in the literature as to whether people are more likely to remember those objects that are consistent with the scene or those that are not. Moreover, whether any discrepancy between the likelihood of remembering schema-consistent or schema-inconsistent objects should be attributed to the schematic effects on attention or on memory remains unclear. To address this issue, the current study attempted to directly manipulate attention allocation by requiring participants to look at (i) schema-consistent objects, (ii) schema-inconsistent objects, or (iii) to share attention equally across both. Regardless of the differential allocation of attention or object fixation, schema-consistent objects were better recalled whereas recognition was independent of schema-consistency, but depended on task instruction. These results suggest that attention is important both for remembering low-level object properties, and information whose retrieval is not supported by the currently active schema. Specific knowledge of the scenes being viewed can result in the recall of non-fixated objects, but without such knowledge attention is required to encode sufficient detail for subsequent recognition. Our results demonstrate therefore that attention is not critical for the retrieval of objects that are consistent with a scene's schematic content.
Collapse
Affiliation(s)
- M M Silva
- Department of Psychology, School of Human Sciences, University of Surrey, Guildford GU2 7XH, UK.
| | | | | |
Collapse
|
30
|
Tannuri U, Velhote MCP, Santos MM, Gibelli NE, Ayoub AA, Maksoud-Filho JG, Silva MM, Pinho ML, Miyatani HT, Maksoud JG. Pediatric liver transplantation: fourteen years of experience at the children institute in São Paulo, Brazil. Transplant Proc 2005; 36:941-2. [PMID: 15194325 DOI: 10.1016/j.transproceed.2004.03.101] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study reports the 14-year experience of a single center on 206 liver transplantations from living and cadaveric donors performed in 179 pediatric patients. Biliary atresia (57.2%) and fulminant hepatitis (9.8%) were the most frequent indications. The mean age of the recipients was 3 years, 7 months (9 months to 18 years) and mean weight was 14 kg (7 to 57 kg). The allografts were distributed as 82 (39.8%) whole cadaveric, 76 (36.9%) reduced-size cadaveric, 46 (22.3%) living donor liver transplants, and 2 (0.9%) ex situ split livers. The waiting periods were 25 days for living donors and 2.5 years for cadaveric donors (P <.001). Twenty-seven children were retransplanted with hepatic artery thrombosis the most frequent indication. The postoperative complications were: primary nonfunction (12.2%), biliary stenosis (28.8%), hepatic artery thrombosis (12.2%), portal vein stenosis (4.9%), hepatic vein stenosis (6.9%), and lymphoproliferative disorder (5.9%). The diagnosis of biliary stenosis was obtained by liver biopsy and transhepatic cholangiography and treated by balloon dilatation, although four children (3.9%) required a redo hepaticojejunostomy. The venous stenoses were percutaneously dilated with five-children (4.9%) requiring venous stents. The incidence of hepatic vein stenosis was 15.6% among living donor and 2.5% in cadaveric liver transplantation (P <.05). The overall 5-year patient and graft survivals were 70.2% and 65.1%. Liver transplantation provides excellent long-term survival. The use of grafts from living donors decreases the waiting periods but increases the incidence of hepatic vein stenosis.
Collapse
Affiliation(s)
- U Tannuri
- Liver Transplantation Unit, Children Institute, Hospital das Clínicas, University of São Paulo, São Paulo, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Gibelli NEM, Pinho-Apezzato ML, Miyatani HT, Maksoud-Filho JG, Silva MM, Ayoub AAR, Santos MM, Velhote MCP, Tannuri U, Maksoud JG. Basiliximab-chimeric anti-IL2-R monoclonal antibody in pediatric liver transplantation: comparative study. Transplant Proc 2005; 36:956-7. [PMID: 15194332 DOI: 10.1016/j.transproceed.2004.04.070] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Basiliximab is a monoclonal antibody that binds to the alpha subunit (CD(25)) of the interleukin-2 receptor of activated T lymphocytes. The advantage of basiliximab in organ transplantation is the reduce possibility to calcineurin inhibitor dosages to avoid nephrotoxicity. Basiliximab has significantly reduced the incidence of acute rejection (AR) in renal transplant recipients; however, the results are uncertain in liver transplantation (LT). The objective of this investigation was to assess the effect of basiliximab to prevent AR in the first 6 months after pediatric LT. From March 2000 to October 2001, 32 recipients of a primary orthotopic cadaveric or living donor LT were given basiliximab by intravenous bolus injection on the day of transplantation (day 0) and on day 4. Four children who received one dose were excluded from the study. The rate and the intensity of AR episodes, the incidence of chronic rejection, serum creatinine level, incidence of infections, adverse side effects, and daily oral dosage of cyclosporine (Neoral) to maintain the target blood level of 850 to 1000 mg/dL at C2, 2 hours after the administration, were analyzed in the remaining 28 recipients. Results were compared to those obtained from a matched historical group (n = 28) of similar age, weight, and hepatic diseases distribution. None of the analyzed parameters was statistically significant (P >.05) except for the daily oral dose of cyclosporine (7 to 13 mg/kg/dose, P <.05). In our series, the addition of basiliximab to the immunosuppressive therapy did not reduce the incidence of AR in pediatric LT.
Collapse
Affiliation(s)
- N E M Gibelli
- Liver Transplantation Unit, Children Institute, Hospital das Clínicas, University of São Paulo, São Paulo, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Volkmer-Ribeiro C, Guadagnin DL, De Rosa-Barbosa R, Silva MM, Drügg-Hahn S, Lopes-Pitoni VL, Gastal HADO, Barros MP, Demaman LV. A polyethylenetherephthalate (PET) device for sampling freshwater benthic macroinvertebrates. BRAZ J BIOL 2004; 64:531-41. [PMID: 15622850 DOI: 10.1590/s1519-69842004000300016] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A new device to sample freshwater benthic macroinvertebrates was used in a low and sandy stretch of a Brazilian sub-tropical river (the River Cai, Triunfo, RS) and in one of its small tributaries, Bom Jardim brook (Arroio Bom Jardim). In this study, the effectiveness of this device, a PET sampler, was tested at different sites in the river and the brook throughout the four seasons between 2001-2002. Comparisons were made by PCA and ANOVA, both employing a bootstrap procedure based on similarity matrices. The PET sampler proved to be a reliable tool for detection of seasonal and spatial differences in richness, total abundance of organisms, and Shannon's diversity index in both river and brook and is therefore recommended for use in the monitoring of macroinvertebrate communities in this system.
Collapse
Affiliation(s)
- C Volkmer-Ribeiro
- Museu de Cîencias Naturais da Fundação Zoobotânica do Rio Grande do Sul, C.P. 1188, CEP 90001-970, Porto Alegre, RS, Brazil,
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Nobre AC, Coêlho GR, Coutinho MC, Silva MM, Angelim EV, Menezes DB, Fonteles MC, Monteiro HS. The role of phospholipase A(2) and cyclooxygenase in renal toxicity induced by microcystin-LR. Toxicon 2001; 39:721-4. [PMID: 11072052 DOI: 10.1016/s0041-0101(00)00193-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We have shown previously that exposure to microcystin-LR (MCLR) causes renal toxic effects in isolated perfused rat kidney. That study was extended further to approach the perspective of pharmacological blockade of renal toxic effects by MCLR through the use of experimental therapeutic agents. An isolated kidney perfusion system was utilized and samples of urine and perfusate were collected at 10min intervals to determine the levels of inulin, sodium, potassium and osmolality. Dexamethasone (20microg ml(-1)) and indomethacin (10microg ml(-1)) were administered in the beginning of the perfusion and MCLR was employed in a dose of 1microg ml(-1) after an internal control of 30min to evaluate the perfusion pressure (PP), renal vascular resistance (RVR), glomerular filtration rate (GFR) and urinary flow (UF). Dexamethasone and indomethacin antagonized the toxic effects of MCLR on PP, RVR, GFR and UF. Histologic analysis of dexamethasone and indomethacin treated groups did not show any vascular or interstitial alterations. MCLR potentially impairs the renal function, probably causing vascular and glomerular lesions and, promoting renal alterations through direct or indirect actions. These data seem to indicate that the renal alterations promoted by MCLR involves also phospholipase A(2) and arachidonic acid-derived mediators.
Collapse
Affiliation(s)
- A C Nobre
- Department of Physiology and Pharmacology, Federal University of Ceara, Rua Cel. Nunes de Melo, 1127, 60430-270, CE, Fortaleza, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Oliveira ES, Boschi ES, Guths H, Alves F, Silva MM, Marques S, Polanczyk CA, Silva NB. Predictors of mortality and prolonged mechanical ventilation in patients admitted to a medical-surgical intensive care unit. Crit Care 2001. [PMCID: PMC3300993 DOI: 10.1186/cc1426] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- ES Oliveira
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - ES Boschi
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - H Guths
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - F Alves
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - MM Silva
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - S Marques
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - CA Polanczyk
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| | - NB Silva
- Centro de Terapia Intensivo do Hospital Moinhos de Vento, Porto Alegre, Brazil
| |
Collapse
|
35
|
Gabriel JE, Ferro MIT, Ferro JA, Silva MM, Givisiez PEN, Macari M. Influence of Dietary Energy Level on Hepatic70-kDa Heat Shock Protein Expression in Broiler Chickens Submitted to Acute Heat Stress. Rev Bras Cienc Avic 2000. [DOI: 10.1590/s1516-635x2000000300008] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This experiment was carried out to study the effect of dietary energy on the colonic temperature and hepatic Hsp70 content in broiler chicken at room temperature and after heat stress conditions. Broiler chickens were reared up to 51 days of life, and fed diets containing high (HE -13,186 kJ ME/kg) or low (LE -12,139 kJ ME/kg) energy. At 21 and 51 days of age, the colonic temperature was measured at room temperature and liver samples were obtained for Hsp70 quantification by Western blotting analysis. It was also investigated at these ages the time course response of colonic temperature and hepatic Hsp70 level during heat stress (35º C/5 h). The data showed that at early age, at room temperature, colonic temperature or hepatic Hsp70 levels were not affected by dietary energy, but at 51 days of life low energy fed broilers had lower Hsp70 concentration in the liver. During heat stress, the increase in both colonic temperature and hepatic Hsp70 concentration were significantly less in high energy fed birds. The findings of this study suggest that hepatic Hsp70 synthesis is affected by dietary energy, and that broiler chicken fed high-energy diet can change the thermoresistance during acute heat stress.
Collapse
|
36
|
Silva MM, Goldman S, Keating G, Marymont MA, Kalapurakal J, Tomita T. Optic pathway hypothalamic gliomas in children under three years of age: the role of chemotherapy. Pediatr Neurosurg 2000; 33:151-8. [PMID: 11096362 DOI: 10.1159/000028996] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Optic pathway/hypothalamic gliomas (OPHGs) tend to occur in young children. Treatment options consist of surgical resection, radiation therapy (RT) and chemotherapy. Due to complications induced by surgery and RT, chemotherapy has gained significant recognition for the treatment of OPHG in young children. Chemosensitivity of OPHG in very young children under 3 years of age has not been well documented. We analyzed 14 patients who were treated with chemotherapy with or without surgery. MATERIALS AND METHODS Fourteen children younger than 3 years (median age of 10 months) with OPHG were treated between 1988 and 1998. Magnetic resonance imaging was obtained in all cases. Hydrocephalus was present in 8 patients and diencephalic syndrome was noted in 6. Only 3 of these had evidence of neurofibromatosis-1. Five patients had partial tumor resection and 4 had endoscopic biopsy at the time of ventriculoperitoneal shunt placement. Pathological examination revealed low-grade astrocytoma in 5 and juvenile pilocytic astrocytoma in 4. All patients received chemotherapy: carboplatin in 8, a combination of carboplatin and vincristine in 4 and a combination of other agents in 2. RESULTS Eight (57%) of 14 patients had a sustained reduction of tumor during the follow-up time between 15 months and 8 years. The 5-year progression-free survival was 63%. These tumor reductions were often accompanied by clinical improvements. Diencephalic syndrome responded to chemotherapy alone in 4 of 6 patients. However, 5 others had progressive disease; 3 during the treatment and 2 following the treatment (9 months and 2 years, respectively). All these 5 patients had a partial tumor resection prior to chemotherapy. CONCLUSION A majority of OPHGs responds to chemotherapy. Due to slow progression of these tumors and adverse effects of other therapeutic modalities, we recommend chemotherapy as a primary treatment for OPHGs. Our present data indicates that partial surgical resection does not enhance chemotherapy effectiveness for OPHGs in infants or children younger than 3 years.
Collapse
Affiliation(s)
- M M Silva
- Division of Pediatric Neurosurgery, Children's Memorial Hospital, Chicago, IL 60614, USA
| | | | | | | | | | | |
Collapse
|
37
|
Tanaka AS, Silva MM, Torquato RJ, Noguti MA, Sampaio CA, Fritz H, Auerswald EA. Functional phage display of leech-derived tryptase inhibitor (LDTI): construction of a library and selection of thrombin inhibitors. FEBS Lett 1999; 458:11-6. [PMID: 10518924 DOI: 10.1016/s0014-5793(99)01106-0] [Citation(s) in RCA: 28] [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: 11/29/2022]
Abstract
The recombinant phage antibody system pCANTAB 5E has been used to display functionally active leech-derived tryptase inhibitor (LDTI) on the tip of the filamentous M13 phage. A limited combinatorial library of 5.2 x 10(4) mutants was created with a synthetic LDTI gene, using a degenerated oligonucleotide and the pCANTAB 5E phagemid. The mutations were restricted to the P1-P4' positions of the reactive site. Fusion phages and appropriate host strains containing the phagemids were selected after binding to thrombin and DNA sequencing. The variants LDTI-2T (K8R, I9V, S10, K11W, P12A), LDTI-5T (K8R, I9V, S10, K11S, P12L) and LDTI-10T (K8R, I9L, S10, K11D, P12I) were produced with a Saccharomyces cerevisiae expression system. The new inhibitors, LDTI-2T and -5T, prolong the blood clotting time, inhibit thrombin (Ki 302 nM and 28 nM) and trypsin (Ki 6.4 nM and 2.1 nM) but not factor Xa, plasma kallikrein or neutrophil elastase. The variant LDTI-10T binds to thrombin but does not inhibit it. The relevant reactive site sequences of the thrombin inhibiting variants showed a strong preference for arginine in position P1 (K8R) and for valine in P1' (I9V). The data indicate further that LDTI-5T might be a model candidate for generation of active-site directed thrombin inhibitors and that LDTI in general may be useful to generate specific inhibitors suitable for a better understanding of enzyme-inhibitor interactions.
Collapse
Affiliation(s)
- A S Tanaka
- Departamento de Bioquímica, UNIFESP-EPM, São Paulo, Brazil.
| | | | | | | | | | | | | |
Collapse
|
38
|
Silva MM, Sousa RC. [Benign prostatic hyperplasia. Guidelines and recommendations in urological clinical practice]. ACTA MEDICA PORT 1999; 12:103-11. [PMID: 10423883] [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: 02/13/2023]
Abstract
After reviewing the clinical, diagnostic and therapeutic attitudes related to benign prostatic hyperplasia, the authors present guidelines for generalists in what concerns practical attitudes and when and how to refer their patients to the urologist. Based on the criteria presented, generalists must refer their patients to a urologist in the presence of mild or severe symptoms, ages below 50, diabetes or neurological perturbations, dysfunctional voiding, palpable bladder, palpable nodule or a diffusely hardened or asymmetric gland revealed by digital rectal examination, haematuria, urinary tract infection, renal impairment or PSA above 4 ng/ml in patients under 70 years of age.
Collapse
Affiliation(s)
- M M Silva
- Serviço de Urologia, Hospital Militar Principal, Lisboa
| | | |
Collapse
|
39
|
Silva MM. [Urological guidelines and recommendations in clinical practice]. ACTA MEDICA PORT 1999; 12:1-2. [PMID: 10423864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
|
40
|
Affiliation(s)
- M M Silva
- Department of Pathology, University Hospital, Federal University of Rio de Janeiro, Brazil
| | | | | | | | | | | |
Collapse
|
41
|
Passos EC, Carrieri ML, Dainovskas E, Camara M, Silva MM. [Isolation of rabies virus from an insectivorous bat, Nyctinomops macrotis, in southeast Brazil]. Rev Saude Publica 1998; 32:74-6. [PMID: 9699349 DOI: 10.1590/s0034-89101998000100011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The rabies virus was isolated from an insectivorous bat, Nyctinomops macrotis, trapped in Diadema, SP, Brazil, in a public building near a water supply reservoir. Fluorescent antibodies against rabies virus were detected in cerebral tissue and the viral isolation was made after the inoculation of cerebral tissue and salivary gland suspension in mice. There have been no recorded cases of animal rabies in Diadema since 1982, and this is the first isolation of the rabies virus in an insectivorous bat in the city.
Collapse
Affiliation(s)
- E C Passos
- Instituto Pasteur de São Paulo, SP, Brasil.
| | | | | | | | | |
Collapse
|
42
|
Abstract
BACKGROUND/PURPOSE The aim of this study was to address the perioperative aspects of hepatoportoenterostomy (HPE) for biliary atresia (BA), through the study of a 15-year, single-center experience of the management of this disease. METHODS One hundred twenty-seven patients were divided into three groups, depending on the variant of HPE performed: group A (n = 53) underwent HPE with external diversion of the Roux-en-Y anastomosis; group B (n = 54) underwent HPE with a long (35 to 40 cm) Roux-en-Y anastomosis, without diversion; and group C (n = 20) underwent the same kind of HPE as group B, but with a modified, "super extensive" dissection of the porta hepatitis. Eleven children in group B had an intussusception type antireflux valve in the Roux-en-Y loop. The porta hepatitis of 105 children was histologically classified in types I to III and correlated with rate of postoperative bile flow and age at surgery. Liver transplantation was performed after HPE in 20 patients. RESULTS Overall, biliary drainage was achieved in 72.5% of the children after HPE and 26.8% of all patients became jaundice free. Porta hepatitis type III was associated with a significantly higher rate of biliary drainage post-HPE then types I and II. There was no difference in the rate of bile drainage, relative number of jaundice-free patients, and mean number of episodes of cholangitis per year among surgical groups A, B, C. In group A, 43.7% of the patients had complications related to the stoma. The actuarial survival of children who underwent HPE followed by liver transplantation was 85%. CONCLUSIONS (1) There is no correlation between type of porta hepatis and age at surgery for BA; (2) type III porta hepatis is associated with higher rates of bile drainage post-HPE; (3) children older than 16 weeks with BA should still be considered for HPE; (4) in these older patients, factors other than the type of porta hepatis, possibly the degree of liver damage, play a role in the lower rate of bile drainage observed; (5) external diversion of the Roux-en-Y in HPE is not beneficial and is detrimental because of stoma-related complications; (6) an antireflux valve in the Roux-en-Y loop does not reduce the incidence of cholangitis post-HPE; (7) Surgical reexploration does not restore biliary drainage; and (8) sequential therapy with HPE followed by liver transplantation remains the treatment of choice for BA.
Collapse
Affiliation(s)
- J G Maksoud
- Division of Surgery, Children's Institute, University of São Paulo Medical School, Brazil
| | | | | | | | | | | |
Collapse
|
43
|
Donovan JL, Kay HE, Peters TJ, Abrams P, Coast J, Matos-Ferreira A, Rentzhog L, Bosch JL, Nordling J, Gajewski JB, Barbalias G, Schick E, Silva MM, Nissenkorn I, de la Rosette JJ. Using the ICSOoL to measure the impact of lower urinary tract symptoms on quality of life: evidence from the ICS-'BPH' Study. International Continence Society--Benign Prostatic Hyperplasia. Br J Urol 1997; 80:712-21. [PMID: 9393291] [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
OBJECTIVE To present and describe the validity and reliability of the International Continence Society-Benign Prostatic Hyperplasia study quality-of-life (ICSQoL) instrument, a new set of questions to assess the impact of lower urinary tract symptoms (LUTS) on quality of life (QoL) in middle-aged and elderly men. PATIENTS AND METHODS The study comprised 1271 consecutive men over the age of 45 years, attending urology departments in 12 countries, with LUTS and possible benign prostatic obstruction who were recruited to the ICS-'BPH' study (the clinic group); 423 ambulant men were recruited from a general practice in the UK to provide a community group. Each individual completed the ICS-'BPH' study questionnaire which includes six items addressing general and specific aspects of QoL (the ICSQoL). Content and construct validity were assessed by interviews with patients and by testing hypotheses within the study groups, e.g. the relationships with age, individual LUTS (as measured on the ICSmale questionnaire) and generic health status, as measured by the Short Form (SF-36) and EuroQol instruments. Reliability was assessed by measures of internal consistency and a test-retest analysis. RESULTS The ICSQoL items were easily understood by patients, were completed with low levels of missing data, and address some (but not all) concerns about the impact of LUTS on QoL. The ICSQoL items have good construct validity, showing expected differences between community and clinic samples, and expected relationships with each other and individual LUTS. Items had good test-retest reliability, but their internal consistency was poor, confirming that ICSQoL questions should not be combined into a score. General ICSQoL items were closely related with most domains of the SF-36 and the EuroQol. CONCLUSION ICSQoL items may be used individually or as a group in research studies or in clinical practice.
Collapse
Affiliation(s)
- J L Donovan
- Department of Social Medicine, University of Bristol
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Rhee S, Silva MM, Hyde CC, Rogers PH, Metzler CM, Metzler DE, Arnone A. Refinement and comparisons of the crystal structures of pig cytosolic aspartate aminotransferase and its complex with 2-methylaspartate. J Biol Chem 1997; 272:17293-302. [PMID: 9211866] [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: 02/04/2023] Open
Abstract
Two high resolution crystal structures of cytosolic aspartate aminotransferase from pig heart provide additional insights into the stereochemical mechanism for ligand-induced conformational changes in this enzyme. Structures of the homodimeric native structure and its complex with the substrate analog 2-methylaspartate have been refined, respectively, with 1.74-A x-ray diffraction data to an R value of 0.170, and with 1.6-A data to an R value of 0.173. In the presence of 2-methylaspartate, one of the subunits (subunit 1) shows a ligand-induced conformational change that involves a large movement of the small domain (residues 12-49 and 327-412) to produce a "closed" conformation. No such transition is observed in the other subunit (subunit 2), because crystal lattice contacts lock it in an "open" conformation like that adopted by subunit 1 in the absence of substrate. By comparing the open and closed forms of cAspAT, we propose a stereochemical mechanism for the open-to-closed transition that involves the electrostatic neutralization of two active site arginine residues by the negative charges of the incoming substrate, a large change in the backbone (phi,psi) conformational angles of two key glycine residues, and the entropy-driven burial of a stretch of hydrophobic residues on the N-terminal helix. The calculated free energy for the burial of this "hydrophobic plug" appears to be sufficient to serve as the driving force for domain closure.
Collapse
Affiliation(s)
- S Rhee
- Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, USA
| | | | | | | | | | | | | |
Collapse
|
45
|
Abstract
Relata-se um caso de raiva em morcego insetívoro, Lasyurus borealis, na região urbana, em bairro residencial, no Município de Jundiaí, SP (Brasil).
Collapse
Affiliation(s)
- L F Martorelli
- Centro de Controle de Zoonoses da Prefeitura da Município de São Paulo, Brasil
| | | | | | | | | |
Collapse
|
46
|
Silva MM, Poland BW, Hoffman CR, Fromm HJ, Honzatko RB. Refined crystal structures of unligated adenylosuccinate synthetase from Escherichia coli. J Mol Biol 1995; 254:431-46. [PMID: 7490761 DOI: 10.1006/jmbi.1995.0629] [Citation(s) in RCA: 35] [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] [Indexed: 01/25/2023]
Abstract
Crystal structures of unligated adenylosuccinate synthetase from Escherichia coli in space groups P2(1) and P2(1)2(1)2(1) have been refined to R-factors of 0.199 and 0.206 against data to 2.0 and 2.5 A, respectively. Bond lengths and angles deviate from expected values by 0.011 A and 1.7 degrees for the P2(1) crystal form and by 0.015 A and 1.7 degrees for the P2(1)2(1)2(1) crystal form. The fold of the polypeptide chain is dominated by a central beta-sheet, which is composed of nine parallel strands and a tenth antiparallel strand. Extending off from this central beta-sheet are four subdomains. The four subdomains contribute loops of residues that are disordered or have high thermal parameters. At least three of these loops (residues 42 to 52, 120 to 131 and 298 to 304) contribute essential residues to the putative active site of the synthetase. In the absence of ligands, much of the active site of the synthetase exists in an ill-defined conformational state. Two, nearly independent regions contribute residues to the interface between polypeptide chains of the synthetase dimer. A pair of helices (H4 and H5) interact with their symmetry-equivalent mates by way of residues that are not conserved amongst the known sequences of the synthetase. The second interface region involves conserved residues belonging to structural elements that connect strands of the central beta-sheet. Residues putatively involved in the binding of IMP lie at or near the interface between polypeptide chains of the dimer. Of the four sequence elements putatively common to all GTP hydrolases, the synthetase has only the guanine recognition element and a glycine-rich loop (P-loop). Although the base recognition element is essentially identical with those of the p21 ras and G alpha proteins, the P-loop of the synthetase is extended in size relative to the P-loops of other GTP hydrolases. The P-loop has two acid residues (Asp13 and Glu14), which are found in the P-loops of only the synthetase family. Glu14 may be involved in the stabilization of the enlarged P-loop of the synthetase, whereas Asp13 may play a role in catalysis and in the coordination of Mg2+. The structural elements of the p21 ras and G alpha proteins responsible for binding Mg2+ are either absent from the synthetase or unavailable for the coordination of metal cations.
Collapse
Affiliation(s)
- M M Silva
- Dept. of Biochemistry and Biophysics, Iowa State University, Ames 50011, USA
| | | | | | | | | |
Collapse
|
47
|
Abstract
Four rabid bats belonging to three species of Molossidae (one Molossus molossus, one Nyctinomops laticaudatus and two N. macrotis) were captured in the State of S. Paulo, southeastern Brazil. Three of these bats were found during the day in unusual, visible places and the other came flying through a window in the evening. A descriptive table containing data on 19 similar cases, belonging to eight species, is presented and suggests that bats with atypical behavior must dearly be suspected of being sick, possibly as having rabies.
Collapse
Affiliation(s)
- W Uieda
- Departamento de Zoologia, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | | | | |
Collapse
|
48
|
Abstract
The following is a case study of the natural infection by the rabies virus of an insectiverous bat belonging to the species Myotis nigricans in the municipality of Ribeirão Pires, Greater S. Paulo. Diagnosis was made by means of immunofluorescence and intracerebral innoculation of mice with nervous and intrascapular muscular tissues.
Collapse
Affiliation(s)
- L F Martorelli
- Centro de Controle de Zoonoses da Prefeitura do Município de São Paulo - Brasil
| | | | | | | | | |
Collapse
|
49
|
Silva MM, Carvalho M, Alves M, Luís ML. [Lumbar spinal stenosis. Significance of neurophysiologic tests]. ACTA MEDICA PORT 1995; 8:101-5. [PMID: 7771202] [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: 01/27/2023]
Abstract
The authors review Lumbar Spinal Stenosis discussing the diagnostic criteria, the etiopathogenesis, and clinical manifestations. Imaging and neurophysiological investigations are also discussed. EMG, Sensory Evoked Potencials and Motor Stimulation are described stressing their role in differential diagnosis. The therapeutic approach is briefly commented.
Collapse
Affiliation(s)
- M M Silva
- Instituto Português de Reumatologia, Centro de Estudos Egas Moniz, Hospital de Santa Maria, Lisboa
| | | | | | | |
Collapse
|
50
|
Almeida MF, Aguiar EA, Martorelli LF, Silva MM. [Laboratory diagnosis of rabies in chiroptera carried out in a metropolitan area of southeastern region Brazil]. Rev Saude Publica 1994; 28:341-4. [PMID: 7660035 DOI: 10.1590/s0034-89101994000500006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Between January, 1988 and December, 1992 the S. Paulo Animal Disease Control Center subjected 289 bats to rabies examinations, utilizing the direct immunofluorescence and biological techniques. Two insectiverous bats belonging to the species Nyctinomops macrotis, representing 0.69% of the total sample, tested positive. Both animals had been captured alive in residential neighborhoods of the city, one in 1988 in the living room of a 7th floor apartment and the other in 1990 on top of a wall surrounding a private house. In the biological tests, the disease showed incubation periods of 13 and 11 days respectively. Although the existence of infected insectiverous bats in urban areas is cause for concern, indiscriminate predatory action against such species can in no way be justified-particularly bearing in mind their importance in preserving the ecological balance of the insect population so prevalent in cities.
Collapse
Affiliation(s)
- M F Almeida
- Centro de Controle de Zoonoses da Prefeitura do Município de São Paulo, Brasil
| | | | | | | |
Collapse
|