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de Magalhães MTQ, de Araújo TS, Silva BM, Icart LP, Scapin SMN, da Silva Almeida M, Lima LMTR. Mutations in asparaginase II from E. coli and implications for inactivation and PEGylation. Biophys Chem 2023; 299:107041. [PMID: 37257341 DOI: 10.1016/j.bpc.2023.107041] [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: 01/04/2023] [Revised: 05/10/2023] [Accepted: 05/12/2023] [Indexed: 06/02/2023]
Abstract
All clinically-used asparaginases convert L-asparagine (L-Asn) to l-aspartate (L-Asp) and l-glutamine (L-Gln) to L-glutamate (L-Glu), which has been useful in reducing bioavailable asparagine and glutamine in patients under treatment for acute lymphoblastic leukemia. The E. coli type 2 L-asparaginase (EcA2) can present different sequences among varying bacterial strains, which we hypothesized that might affect their biological function, stability and interchangeability. Here we report the analysis of two EcA2 provided by the public health system of a middle-income country. These enzymes were reported to have similar specific activity in vitro, whereas they differ in vivo. Protein sequencing by LC-MS-MS and peptide mapping by MALDI-ToF-MS of their tryptic digests revealed that Aginasa™ share similar sequence to EcA2 from E. coli strain BL21(DE3), while Leuginase™ has sequence equivalent to EcA2 from E. coli strain AS1.357. The two amino acid differences between Aginasa™ (64D and 252 T) and Leuginase™ (64 N and 252S) resulted in structural divergences in solution as accessed by small-angle X-ray scattering and molecular dynamics simulation trajectories. The conformational variability further results in dissimilar surface accessibility with major consequences for PEGylation, as well as different susceptibility to degradation by limited proteolysis. The present results reveal that the sequence variations between these two EcA2 variants results in conformational changes associated with differential conformational plasticity, potentially affecting physico-chemical and biological properties, including proteolytic and immunogenic silent inactivation.
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Affiliation(s)
- Mariana T Q de Magalhães
- Laboratório de Biofísica de Macromoléculas - LBM, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biomédicas (ICB), Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil.
| | - Talita Stelling de Araújo
- Protein Advanced Biochemistry - PAB, Centro Nacional de Biologia Estrutural e Bioimagem - CENABIO, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto de Bioquímica Médica Leopoldo De Meis (IBqM), Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Laboratório de Biotecnologia Farmacêutica (pbiotech), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
| | - Bruno Marques Silva
- Laboratório de Biofísica de Macromoléculas - LBM, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biomédicas (ICB), Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Luis Peña Icart
- Laboratório de Biotecnologia Farmacêutica (pbiotech), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
| | - Sandra M N Scapin
- Laboratório de Macromoléculas e Bioquímica (LAMAC), Coordenação-Geral de Metrologia em Biologia (COBIO), Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil.
| | - Marcius da Silva Almeida
- Protein Advanced Biochemistry - PAB, Centro Nacional de Biologia Estrutural e Bioimagem - CENABIO, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Laboratório de Biotecnologia Farmacêutica (pbiotech), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Luís Maurício T R Lima
- Laboratório de Biotecnologia Farmacêutica (pbiotech), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Laboratório de Macromoléculas e Bioquímica (LAMAC), Coordenação-Geral de Metrologia em Biologia (COBIO), Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil; Programa de Pós-Graduação em Quimica Biologica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.
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De Sá Souza H, Piovezan RD, Chagas Miranda RE, Silva BM, Tufik S, Poyares D, D’Almeida V. 0832 Physical Exercise Improves Sleep and Muscle Function in Sarcopenic Patients: A Randomized Controlled Trial. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Introduction
Sarcopenia is a multifactorial condition that, like sleep debt, affects the elderly and is related to metabolic, endocrine, inflammatory alterations and risk to mortality. Resistance training (RT), in turn, can improve both factors. Aim: investigate the effects of 12-week RT on sleep and muscle function in the sarcopenic elderly.
Methods
28 sarcopenic elderly were equally distributed in 2 groups at random: CTL: who participated in weekly lifestyle change lectures or; RT: who did the progressive load RT. Sleep was assessed by polysomnography, actigraphy and questionnaires. Isokinetic and isometric of peak torque (PT) of skeletal muscle, anabolic and catabolic hormones, pro and anti-inflammatory cytokines concentrations were also evaluated. For intention to treat analysis (Δ) the generalized linear/non-linear for absolute variables or Wilcoxon rank-sum (Mann-Whitney) test. Data are expressed as mean±standard deviation or median, minimum and maximum values and difference witch p<0.05.
Results
The RT reduced the time to sleep onset (16.09±15.21) compared to CTL (29.98±22.57) group after the intervention. The Δ shows that RT had more N3 sleep (median:0.90, min:-13.40, max: 25.00) than CTL (median:-3.35, min:-15.20, max:19.10). The RT increases TTS (median:57.55, min:-204.75, max:220.91 vs median:-9.63, min:-120.98, max:185.57) and improved self-reported sleep quality (median: -1.50, min: -9.00, max: 4.00 vs median: 0.50, min: -3.00, max: 6.00) and sleep efficiency (median: 9.50, min: -15.00, max: 34.00 vs 0.00, min: -28.00, max: 18.00). For all muscle function parameters (extension and flexion knee in isokinetic or isometric PT) RT had higher values compared to CTL group after 12 weeks of intervention (p<0.05). IL-1ra concentrations were higher in RT (median: 0.04, min: -0.02, max: 0.36) vs CTL (median:-0.01, min:-0.12, max:0.07).
Conclusion
Progressive load resistance training improves sleep parameters associated to muscle recovery in elderly people with sarcopenia, along with positive changes in physical performance.
Support
Associação Fundo de Incentivo à Pesquisa (AFIP), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).
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Affiliation(s)
- H De Sá Souza
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
| | - R D Piovezan
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
| | | | - B M Silva
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
| | - S Tufik
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
| | - D Poyares
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
| | - V D’Almeida
- Universidade Federal de São Paulo, SAO PAULO, BRAZIL
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Carneiro ACA, Costa GP, Ferreira CS, Ramos IPR, Sarandy MM, Leite ALJ, Menezes APJ, Silva BM, Nogueira KOPC, Carvalho ACC, Gonçalves RV, Talvani A. Combination therapy with benznidazole and doxycycline shows no additive effect to monotherapy with benznidazole in mice infected with the VL-10 strain of the Trypanosoma cruzi. Int J Cardiol 2020; 299:243-248. [PMID: 31353153 DOI: 10.1016/j.ijcard.2019.07.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 06/20/2019] [Accepted: 07/15/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Chagas heart disease is the most important clinical manifestation of Trypanosoma cruzi infection. Pharmacological therapies have been proposed aiming to reduce inflammatory response and cardiac damage in infected hosts. In this study, we investigated the use of doxycycline (Dox), in a sub-antimicrobial dose, in monotherapy and in combination with benznidazole (Bz) during the acute phase of infection with the VL-10 strain of T. cruzi, evaluating the therapeutic effect during the acute and chronic phases of the infection. METHODS AND RESULTS C57BL/6 mice were treated for 20 days with Dox (30 mg/kg), Bz (100 mg/kg), or both drugs in combination starting 9 days after infection. Parasitemia was measured during the acute phase and the animals were monitored for 12 months, after which echocardiography analysis was performed. Blood samples were obtained from euthanized mice for CCL2, CCL5, IL-10 analysis, and cardiac fragments were collected for histopathological evaluation. Dox treatment did not ameliorate parasitological/inflammatory parameters but reduced the cardiac collagen neoformation (CN) in 35%. In contrast, Bz administration reduced parasitemia, plasma levels of CCL2 and CCL5, and cardiac infiltration during acute infection, and reduced the level of IL-10 and CN (95%) at 12 months. Dox was unable to improve ejection fraction, while Bz treatment ameliorated the ejection fraction. No additive effect was observed in combination therapy. CONCLUSION Dox monotherapy is not effective in the acute or chronic phases of experimental cardiomyopathy induced by the VL-10 strain of T. cruzi. Furthermore, combination therapy with Dox does not potentiate the effects of Bz monotherapy.
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Affiliation(s)
- Ana Cláudia Alvarenga Carneiro
- Laboratório de Imunobiologia da Inflamação, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - G P Costa
- Laboratório de Imunobiologia da Inflamação, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - Cyntia Silva Ferreira
- Laboratório de Biologia e Tecnologia de Micro-organismos, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | | | - Mariáurea Matias Sarandy
- Laboratório de Patologia Experimental, Departamento de Biologia Animal, Universidade Federal de Viçosa Minas Gerais, Brazil
| | - Ana Luísa Junqueira Leite
- Laboratório de Imunobiologia da Inflamação, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - A P J Menezes
- Laboratório de Imunobiologia da Inflamação, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - B M Silva
- Laboratório de Biologia e Tecnologia de Micro-organismos, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - K O P C Nogueira
- Laboratório de Biomateriais e Patologia Experimental, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
| | - A C C Carvalho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Reggiani Vilela Gonçalves
- Laboratório de Patologia Experimental, Departamento de Biologia Animal, Universidade Federal de Viçosa Minas Gerais, Brazil
| | - André Talvani
- Laboratório de Imunobiologia da Inflamação, Departamento Ciências Biológicas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil.
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Souza HS, Miranda RE, Silva BM, Bittencourt LA, Tufik S, D’Almeida V. 0718 Sarcopenia Increases the Frequency of Obstructive Sleep Apnea in the Elderly. Sleep 2018. [DOI: 10.1093/sleep/zsy061.717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H S Souza
- Universidade Federal de São Paulo, São Paulo, BRAZIL
| | - R E Miranda
- Universidade Federal de São Paulo, São Paulo, BRAZIL
| | - B M Silva
- Universidade Federal de São Paulo, São Paulo, BRAZIL
| | | | - S Tufik
- Universidade Federal de São Paulo, São Paulo, BRAZIL
| | - V D’Almeida
- Universidade Federal de São Paulo, São Paulo, BRAZIL
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Silva BM, Rossi AAB, Tiago AV, Schmitt KFM, Dardengo JFE, Souza SAM. Genetic diversity of Cajazeira (Spondias mombin L.) in three geographic regions. Genet Mol Res 2017; 16:gmr-16-01-gmr.16018946. [PMID: 28128399 DOI: 10.4238/gmr16018946] [Citation(s) in RCA: 3] [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: 11/03/2022]
Abstract
Cajazeira (Spondias mombin L.), of the family Anacardiaceae, is a species of fruit tree found in the Amazon region with fruits that have excellent prospects for commercial use. We aimed to evaluate the genetic diversity within and among natural populations of S. mombin, with natural occurrence in northern Mato Grosso State, by using inter-simple sequence repeat (ISSR) markers. Overall, 126 individuals were evaluated from three populations located Alta Floresta (AFL) 42, Marcelândia (MAR) 41, and Nova Bandeirantes (NBA) 43. The individuals were genotyped with 14 ISSR primers, which amplified 99 fragments. All markers, with the exception of DiGA3'A, presented a polymorphic information content above 0.25, and thus, are recommended for diversity analyses in S. mombin. Genetic diversity of the AFL [Nei's diversity (H) = 0.2430 and Shannon index (I) = 0.3547] and MAR (H = 0.2062 and I = 0.2993) populations was higher when compared to the NBA population, which presented the lowest genetic diversity (H = 0.2002 and I = 0.2957). Analysis of molecular variance showed that 77.38% of the total genetic variation is found within populations while 22.62% is found among populations. AFL and NBA are genetically the most similar populations and also the closest "Structure" revealed genetic diversity among the genotypes of each population. As there is genetic variability in both populations, and there are no genetically identical individuals, both populations can be a source of genotypes for germplasm banks and for future commercial fruitful plantations S. mombin.
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Affiliation(s)
- B M Silva
- Programa de Pós-Graduação em Biodiversidade e Agroecossistemas Amazônicos, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, PPGBionorte, Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - A A B Rossi
- Programa de Pós-Graduação em Biodiversidade e Agroecossistemas Amazônicos, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, PPGBionorte, Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - A V Tiago
- Programa de Pós-Graduação em Biodiversidade e Agroecossistemas Amazônicos, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, PPGBionorte, Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - K F M Schmitt
- Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual Norte Fluminense Darcy Ribeiro, UENF, Campos dos Goytacazes, RJ, Brasil
| | - J F E Dardengo
- Programa de Pós-Graduação em Biodiversidade e Agroecossistemas Amazônicos, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, PPGBionorte, Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - S A M Souza
- Programa de Pós-Graduação em Biodiversidade e Agroecossistemas Amazônicos, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, PPGBionorte, Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
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Martins AD, Sá R, Monteiro MP, Barros A, Sousa M, Carvalho RA, Silva BM, Oliveira PF, Alves MG. Ghrelin acts as energy status sensor of male reproduction by modulating Sertoli cells glycolytic metabolism and mitochondrial bioenergetics. Mol Cell Endocrinol 2016; 434:199-209. [PMID: 27392494 DOI: 10.1016/j.mce.2016.07.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [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: 02/11/2016] [Revised: 07/04/2016] [Accepted: 07/04/2016] [Indexed: 02/06/2023]
Abstract
Ghrelin is a growth hormone-releasing peptide that has been suggested to interfere with spermatogenesis, though the underling mechanisms remain unknown. We studied the effect of ghrelin in human Sertoli cells (hSCs) metabolic phenotype. For that, hSCs were exposed to increasing concentrations of ghrelin (20, 100 and 500 pM) mimicking the levels reported in obese, normal weight, and severely undernourished individuals. The metabolite production/consumption was determined. The protein levels of key glycolysis-related transporters and enzymes were assessed. The lactate dehydrogenase (LDH) activity was measured. Mitochondrial complexes protein levels and mitochondria membrane potential were also measured. We showed that hSCs express the growth hormone secretagogue receptor. At the concentration present in the plasma of normal weight men, ghrelin caused a decrease of glucose consumption and mitochondrial membrane potential in hSCs, though LDH activity and lactate production remained unchanged, illustrating an alteration of glycolytic flux efficiency. Exposure of hSCs to levels of ghrelin found in the plasma of severely undernourished individuals decreased pyruvate consumption and mitochondrial complex III protein expression. All concentrations of ghrelin decreased alanine and acetate production by hSCs. Notably, the effects of ghrelin levels found in severely undernourished individuals were more pronounced in hSCs metabolic phenotype highlighting the importance of a proper eating behavior to maintain male reproductive potential. In conclusion, ghrelin acts as an energy status sensor for hSCs in a dose-dependent manner, showing an inverse association with the production of lactate, thus controlling the nutritional support of spermatogenesis.
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Affiliation(s)
- A D Martins
- Department of Microscopy, Laboratory of Cell Biology, Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, 4050-313, Porto, Portugal; Unit for Multidisciplinary Research in Biomedicine, Abel Salazar Institute of Biomedical Sciences (UMIB-ICBAS), University of Porto, 4050-313, Porto, Portugal
| | - R Sá
- Department of Microscopy, Laboratory of Cell Biology, Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, 4050-313, Porto, Portugal; Unit for Multidisciplinary Research in Biomedicine, Abel Salazar Institute of Biomedical Sciences (UMIB-ICBAS), University of Porto, 4050-313, Porto, Portugal
| | - M P Monteiro
- Unit for Multidisciplinary Research in Biomedicine, Abel Salazar Institute of Biomedical Sciences (UMIB-ICBAS), University of Porto, 4050-313, Porto, Portugal; Department of Anatomy, Abel Salazar Institute of Biomedical Sciences, ICBAS, University of Porto, 4050-313, Porto, Portugal
| | - A Barros
- Centre for Reproductive Genetics Professor Alberto Barros, 4100-009, Porto, Portugal; Department of Genetics, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135, Porto, Portugal
| | - M Sousa
- Department of Microscopy, Laboratory of Cell Biology, Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, 4050-313, Porto, Portugal; Unit for Multidisciplinary Research in Biomedicine, Abel Salazar Institute of Biomedical Sciences (UMIB-ICBAS), University of Porto, 4050-313, Porto, Portugal; Centre for Reproductive Genetics Professor Alberto Barros, 4100-009, Porto, Portugal
| | - R A Carvalho
- Department of Life Sciences, Faculty of Sciences and Technology and Center for Neurosciences and Cell Biology (CNC), University of Coimbra, 3004-504, Coimbra, Portugal
| | - B M Silva
- Health Sciences Research Centre (CICS), University of Beira Interior, 6201-506, Covilhã, Portugal
| | - P F Oliveira
- Department of Microscopy, Laboratory of Cell Biology, Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, 4050-313, Porto, Portugal; Unit for Multidisciplinary Research in Biomedicine, Abel Salazar Institute of Biomedical Sciences (UMIB-ICBAS), University of Porto, 4050-313, Porto, Portugal; i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135, Porto, Portugal
| | - M G Alves
- Department of Life Sciences, Faculty of Sciences and Technology and Center for Neurosciences and Cell Biology (CNC), University of Coimbra, 3004-504, Coimbra, Portugal; Health Sciences Research Centre (CICS), University of Beira Interior, 6201-506, Covilhã, Portugal.
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Tiago AV, Rossi AAB, Tiago PV, Carpejani AA, Silva BM, Hoogerheide ESS, Yamashita OM. Genetic diversity in cassava landraces grown on farms in Alta Floresta-MT, Brazil. Genet Mol Res 2016; 15:gmr8615. [PMID: 27706696 DOI: 10.4238/gmr.15038615] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Brazil is considered one of the domestication centers of cassava (Manihot esculenta), containing a large part of the biological diversity and traditional knowledge of the species. The aim of the present study was to evaluate the genetic diversity of cassava landraces grown by farmers in the north of Mato Grosso State, Brazil, using inter simple sequence repeat (ISSR) molecular markers. The study was carried out in the municipality of Alta Floresta, MT, on farms located in two rural areas. Seventeen cassava landraces were selected. The DNA was extracted and polymerase chain reaction amplifications were performed using 15 ISSR primers. Genetic similarity estimates were calculated using Jaccard's index and the generated matrix was used for clustering the genotypes by using UPGMA and Tocher's methods. The 15 ISSR primers amplified 120 fragments, revealing 61.67% polymorphism. The polymorphism information content ranged from 0.04 to 0.61, averaging 0.39. The most similar genotypes were AF5 and AF8, whereas the least similar were AF1 and AF16. The UPGMA clustering method formed five groups. Group I included twelve landraces, Group II contained two, and the other groups contained one landrace each. Tocher's method resulted in six groups: 12 landraces clustered in one group, and the other groups each contained one landrace. The ISSR markers proved efficient in revealing genetic diversity among the cassava landraces. The landraces grown by farmers in the two rural areas of Alta Floresta have a great variability and, thus, can be exploited in programs for breeding and preservation of the species.
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Affiliation(s)
- A V Tiago
- Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, PPGBioAgro, PGMP, PPGBionorte, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - A A B Rossi
- Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, PPGBioAgro, PGMP, PPGBionorte, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - P V Tiago
- Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, PPGBioAgro, PGMP, PPGBionorte, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - A A Carpejani
- Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, PPGBioAgro, PGMP, PPGBionorte, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | - B M Silva
- Laboratório de Genética Vegetal e Biologia Molecular, Faculdade de Ciências Biológicas e Agrárias, PPGBioAgro, PGMP, PPGBionorte, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
| | | | - O M Yamashita
- Laboratório de Tecnologia de Sementes e Matologia, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, Alta Floresta, MT, Brasil
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8
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Silva BM, Rossi AAB, Dardengo JFE, Silva CR, Silva IV, Silva ML, Silva CJ. Genetic structure of natural populations of Theobroma in the Juruena National Park, Mato Grosso State, Brazil. Genet Mol Res 2015; 14:10365-75. [PMID: 26345977 DOI: 10.4238/2015.september.1.3] [Citation(s) in RCA: 4] [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: 11/03/2022]
Abstract
Several species within the genus Theobroma have particularly high economic value, including T. cacao and T. grandiflorum. Other species in this genus, such as T. speciosum and T. subincanum, have potential value for use in the conservation of genetic diversity in breeding programs. These latter species could also be domesticated or improved to produce commercial products. Using 13 simple sequence repeat loci, the population structure and genetic diversity of T. speciosum and T. subincanum natural populations in the Juruena National Park, Mato Grosso State, Brazil, was studied. We sampled all individuals of each species (N = 25) present inside a designated research area established by the Program for Research on Biodiversity. The average number of alleles per locus was 5 for T. speciosum and 6.69 for T. subincanum, with average PIC values above 0.5 in both species. All evaluated individuals varied genetically. Seeds from the individuals analyzed will be useful for the development of germplasm banks and for establishment of breeding programs.
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Affiliation(s)
- B M Silva
- Laboratório de Genética Vegetal e Biologia Molecular, Rede Bionorte, Faculdade de Ciências Biológicas e Agrárias
| | - A A B Rossi
- Laboratório de Genética Vegetal e Biologia Molecular, Rede Bionorte, Faculdade de Ciências Biológicas e Agrárias
| | - J F E Dardengo
- Laboratório de Genética Vegetal e Biologia Molecular, Rede Bionorte, Faculdade de Ciências Biológicas e Agrárias
| | - C R Silva
- Departamento de Agronomia, Universidade Federal Rural da Amazônia, Campus de Parauapebas, Parauapebas, PA, Brasil
| | - I V Silva
- Laboratório de Biologia Vegetal, Faculdade de Ciências Biológicas e Agrárias, Universidade do Estado de Mato Grosso, Campus de Alta Floresta, MT, Brasil
| | - M L Silva
- Laboratório de Genética/Cultura de Tecido Vegetal, Centro de Pesquisa, Estudos e Desenvolvimento Agro-Ambientais
| | - C J Silva
- Centro de Pesquisa em Liminologia, Biodiversidade e Etnobiologia do Pantanal, Rede Bionorte, Universidade do Estado de Mato Grosso, Campus de Cáceres, MT, Brasil
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Carvalho C, Marinho A, Leal B, Bettencourt A, Boleixa D, Almeida I, Farinha F, Costa PP, Vasconcelos C, Silva BM. Association between vitamin D receptor (VDR) gene polymorphisms and systemic lupus erythematosus in Portuguese patients. Lupus 2015; 24:846-53. [DOI: 10.1177/0961203314566636] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 12/11/2014] [Indexed: 01/05/2023]
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disease of unknown origin, in which both genetic and environmental factors are involved. One such environmental factor is vitamin D, a vital hormone that plays a specific function in the immune system homeostasis, acting through a nuclear receptor ( VDR) expressed in all immune cells. Several polymorphisms of the gene that encodes this receptor have been described. Though inconsistently, these polymorphisms have been associated with clinical manifestations and SLE development. The aim of this study was to determine the possible association between VDR gene polymorphisms (BsmI, ApaI, TaqI e FokI) and SLE susceptibility and severity, in a cohort of lupus patients from the north of Portugal. A total of 170 patients (F = 155, M = 15; age = 45 ± 13.4 years) with SLE (diagnosed according the American College of Rheumatology criteria) with at least five years of disease evolution and followed in the Autoimmune Disease Clinical Immunology Unit of Centro Hospitalar do Porto were studied. Patients and 192 ethnicity-matched controls were genotyped for BsmI (rs1544410), ApaI (rs7975232), TaqI (rs731236) and FokI (rs2228570) polymorphisms by TaqMan allelic discrimination assay. Disease severity was assessed by SLICC damage score, number of affected organs, number of severe flares and pharmacological history. SLE patients with the CT genotype of FokI polymorphism have a higher SLICC value ( p = 0.031). The same result was observed for the group of patients with the TT genotype of TaqI polymorphism ( p = 0.046). No differences were observed in VDR genotype between patients and controls. Also, we observed that the other clinical features analysed were not influenced by VDR polymorphisms. Our study confirms a possible role of VDR gene polymorphisms in SLE. A positive association was found between VDR polymorphisms and SLE severity (chronic damage). The presence of CT genotype of FokI and TT genotype of TaqI seems to confer a worse prognosis and may constitute a risk factor for higher long-term cumulative damage in SLE patients.
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Affiliation(s)
- C Carvalho
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
| | - A Marinho
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
- Unidade Imunologia Clínica, Centro Hospitalar do Porto, Hospital Santo António, Porto, Portugal
| | - B Leal
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
| | - A Bettencourt
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
| | - D Boleixa
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
| | - I Almeida
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
- Unidade Imunologia Clínica, Centro Hospitalar do Porto, Hospital Santo António, Porto, Portugal
| | - F Farinha
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
- Unidade Imunologia Clínica, Centro Hospitalar do Porto, Hospital Santo António, Porto, Portugal
| | - P P Costa
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
| | - C Vasconcelos
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
- Unidade Imunologia Clínica, Centro Hospitalar do Porto, Hospital Santo António, Porto, Portugal
| | - B M Silva
- UMIB – Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) – UPorto, Porto, Portugal
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10
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Moreno AM, Castro RRT, Silva BM, Villacorta H, Sant'Anna Junior M, Nóbrega ACL. Intercostal and forearm muscle deoxygenation during respiratory fatigue in patients with heart failure: potential role of a respiratory muscle metaboreflex. ACTA ACUST UNITED AC 2014. [PMID: 25296359 PMCID: PMC4230287 DOI: 10.1590/1414-431x20143896] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to determine the effect of respiratory muscle fatigue
on intercostal and forearm muscle perfusion and oxygenation in patients with heart
failure. Five clinically stable heart failure patients with respiratory muscle
weakness (age, 66±12 years; left ventricle ejection fraction, 34±3%) and nine matched
healthy controls underwent a respiratory muscle fatigue protocol, breathing against a
fixed resistance at 60% of their maximal inspiratory pressure for as long as they
could sustain the predetermined inspiratory pressure. Intercostal and forearm muscle
blood volume and oxygenation were continuously monitored by near-infrared
spectroscopy with transducers placed on the seventh left intercostal space and the
left forearm. Data were compared by two-way ANOVA and Bonferroni correction.
Respiratory fatigue occurred at 5.1±1.3 min in heart failure patients and at 9.3±1.4
min in controls (P<0.05), but perceived effort, changes in heart rate, and in
systolic blood pressure were similar between groups (P>0.05). Respiratory fatigue
in heart failure reduced intercostal and forearm muscle blood volume (P<0.05)
along with decreased tissue oxygenation both in intercostal (heart failure,
-2.6±1.6%; controls, +1.6±0.5%; P<0.05) and in forearm muscles (heart failure,
-4.5±0.5%; controls, +0.5±0.8%; P<0.05). These results suggest that respiratory
fatigue in patients with heart failure causes an oxygen demand/delivery mismatch in
respiratory muscles, probably leading to a reflex reduction in peripheral limb muscle
perfusion, featuring a respiratory metaboreflex.
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Affiliation(s)
- A M Moreno
- Procordis Hospital Cardiológico, Niterói, RJ, Brasil
| | - R R T Castro
- Programa de Pós-graduação em Ciências Cardiovasculares, Universidade Federal Fluminense, Niterói, RJ, Brasil
| | - B M Silva
- Departamento de Fisiologia e Farmacologia, Universidade Federal Fluminense, Niterói, RJ, Brasil
| | - H Villacorta
- Programa de Pós-graduação em Ciências Cardiovasculares, Universidade Federal Fluminense, Niterói, RJ, Brasil
| | | | - A C L Nóbrega
- Departamento de Fisiologia e Farmacologia, Universidade Federal Fluminense, Niterói, RJ, Brasil
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11
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Torres T, Bettencourt N, Mendonça D, Vasconcelos C, Gama V, Silva BM, Selores M. Epicardial adipose tissue and coronary artery calcification in psoriasis patients. J Eur Acad Dermatol Venereol 2014; 29:270-277. [PMID: 24750319 DOI: 10.1111/jdv.12516] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 03/17/2014] [Indexed: 11/27/2022]
Abstract
BACKGROUND Psoriasis is a chronic, immune-mediated disease associated with several cardio-metabolic comorbidities, accelerated atherosclerosis and cardiovascular disease (CVD). Other causes beyond systemic inflammation and traditional cardiovascular risk factors (CVRF) may be implicated in the increased risk of CVD observed in these patients. Epicardial adipose tissue (EAT), a type of visceral adipose tissue surrounding the heart and coronary vessels has been implicated in the development of coronary artery disease, by endocrine mechanisms, but particularly by local inflammation. OBJECTIVE To compare EAT volumes in psoriasis patients and controls using multidetector computed tomography (MDCT) and to analyse if eventual differences were independent from abdominal visceral adiposity; to determine, within psoriasis patients, its relation with subclinical atherosclerosis and other markers of cardiometabolic risk. METHODS One hundred patients with severe psoriasis, without CVD underwent MDCT, with EAT and abdominal visceral fat (AVF) assessment and coronary artery calcification (CAC) quantification and were compared with 202 control patients. RESULTS EAT volume was increased in psoriasis patients compared to control subjects, independently from age, sex and AVF, being, on average, 15.2 ± 4.41 mL higher (95% CI: 6.5-26.0, P = 0.001) than in controls. Moreover, psoriasis patients had a statistically significant higher risk of having subclinical atherosclerosis (OR 2.52, 95% CI: 1.23-5.16) than controls, after adjusting for traditional CVRF. Within psoriasis patients EAT volume was associated with subclinical atherosclerosis, independently of age, sex, psoriasis duration, classical CVRF and AVF. CONCLUSION This study showed that psoriasis was associated with increased EAT volume independently of visceral abdominal fat and with subclinical atherosclerosis. Within psoriasis patients EAT volume was independently associated with CAC. EAT may be another important contributor to the higher cardiovascular risk observed in psoriasis.
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Affiliation(s)
- T Torres
- Department of Dermatology, Centro Hospitalar do Porto, Porto, Portugal.,Unit for Multidisciplinary Investigation in Biomedicine, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
| | - N Bettencourt
- Department of Cardiology, Centro Hospitalar Gaia/Espinho, Porto, Portugal
| | - D Mendonça
- Department of Population Studies, Instituto Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
| | - C Vasconcelos
- Unit for Multidisciplinary Investigation in Biomedicine, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal.,Department of Clinical Immunology, Centro Hospitalar of Porto, Porto, Portugal
| | - V Gama
- Department of Cardiology, Centro Hospitalar Gaia/Espinho, Porto, Portugal
| | - B M Silva
- Unit for Multidisciplinary Investigation in Biomedicine, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal.,Immunogenetics Laboratory, Instituto Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
| | - M Selores
- Department of Dermatology, Centro Hospitalar do Porto, Porto, Portugal
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Hosman AE, Devlin HL, Silva BM, Elphick AH, Shovlin CL. P83 Should children from HHT families undergo screening thoracic CT scans for the diagnosis of pulmonary arteriovenous malformations? Survey data on breast cancer incidence. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.233] [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: 11/03/2022]
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13
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Hosman AE, Devlin HL, Silva BM, Elphick AH, Shovlin CL. P9 Epidemiological survey suggests lung cancer is less common in patients with hereditary haemorrhagic telangiectasia compared to controls. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.159] [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: 11/04/2022]
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Carvalho C, Calvisi SL, Leal B, Bettencourt A, Marinho A, Almeida I, Farinha F, Costa PP, Silva BM, Vasconcelos C. CCR5-Delta32: implications in SLE development. Int J Immunogenet 2013; 41:236-41. [PMID: 24164722 DOI: 10.1111/iji.12094] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 08/13/2013] [Accepted: 08/25/2013] [Indexed: 11/30/2022]
Abstract
Systemic lupus erythematosus (SLE) is a prototypical autoimmune disease with strong genetic and environmental components. Previous studies have shown increased levels of several chemokines in active SLE. C-C chemokine receptor type 5 (CCR5) is involved in the recruitment of inflammatory cells into tissues, and mechanisms modulating CCR5 expression and function may interfere in SLE development, influencing the clinical course of the disease. The aim of this study was to evaluate the possible association between the CCR5∆32 base-pair deletion polymorphism and SLE disease in a group of Portuguese patients. A total of 219 patients with SLE and 205 healthy individuals were studied. The frequency of CCR5/∆32 heterozygotes was lower in patients with SLE than in controls (8% vs. 15% OR = 0.5162; P = 0.0319), suggesting a protective association between CCR5∆32 allele and SLE. These results highlight the protective role of Th1 cells that express CCR5 in SLE pathogenesis.
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Affiliation(s)
- C Carvalho
- UMIB, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS) UPorto, Porto, Portugal
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15
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Neves FJ, Carvalho ACG, Rocha NG, Silva BM, Sales ARK, de Castro RRT, Rocha JD, Thomaz TG, Nóbrega ACL. Hemodynamic mechanisms of the attenuated blood pressure response to mental stress after a single bout of maximal dynamic exercise in healthy subjects. Braz J Med Biol Res 2012; 45:610-6. [PMID: 22584644 PMCID: PMC3854267 DOI: 10.1590/s0100-879x2012007500083] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 05/03/2012] [Indexed: 11/28/2022] Open
Abstract
To determine the hemodynamic mechanisms responsible for the attenuated blood pressure response to mental stress after exercise, 26 healthy sedentary individuals (age 29 ± 8 years) underwent the Stroop color-word test before and 60 min after a bout of maximal dynamic exercise on a treadmill. A subgroup (N = 11) underwent a time-control experiment without exercise. Blood pressure was continuously and noninvasively recorded by infrared finger photoplethysmography. Stroke volume was derived from pressure signals, and cardiac output and peripheral vascular resistance were calculated. Perceived mental stress scores were comparable between mental stress tests both in the exercise (P = 0.96) and control (P = 0.24) experiments. After exercise, the systolic blood pressure response to mental stress was attenuated (pre: 10 ± 13 vs post: 6 ± 7 mmHg; P < 0.01) along with lower values of systolic blood pressure (pre: 129 ± 3 vs post: 125 ± 3 mmHg; P < 0.05), stroke volume (pre: 89.4 ± 3.5 vs post: 76.8 ± 3.8 mL; P < 0.05), and cardiac output (pre: 7.00 ± 0.30 vs post: 6.51 ± 0.36 L/min; P < 0.05). Except for heart rate, the hemodynamic responses and the mean values during the two mental stress tests in the control experiment were similar (P > 0.05). In conclusion, a single bout of maximal dynamic exercise attenuates the blood pressure response to mental stress in healthy subjects, along with lower stroke volume and cardiac output, denoting an acute modulatory action of exercise on the central hemodynamic response to mental stress.
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Affiliation(s)
- F J Neves
- Programa de Pós-Graduação em Ciências Cardiovasculares, Faculdade de Medicina, Universidade Federal Fluminense, Niterói, RJ, Brasil
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16
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Bettencourt A, Silva AM, Santos E, Gomes S, Mendonça D, Costa PP, Faustino P, Silva BM. HFE gene polymorphisms and severity in Portuguese patients with multiple sclerosis. Eur J Neurol 2011; 18:663-6. [PMID: 20586792 DOI: 10.1111/j.1468-1331.2010.03109.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND High iron concentrations have been reported in oligodendrocytes, myelin and macrophages in multiple sclerosis (MS) lesions. It has been proposed that HFE gene polymorphisms could have a role in MS. METHODS The C282Y and H63D HFE variants frequencies were determined in 373 patients with MS and compared with a normal population. RESULTS No significant association was found between HFE polymorphisms and disease susceptibility. An analysis of the association of genotypes with disease severity was performed, and the C282Y allele was more frequent in the aggressive group. CONCLUSIONS Patients carrying the C282Y variant seem to have a worse prognosis.
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Affiliation(s)
- A Bettencourt
- UMIB - Instituto de Ciências Biomédicas Abel Salazar (ICBAS-UP), Porto, Portugal.
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17
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Bettencourt A, Pereira C, Carvalho L, Carvalho C, Patto JV, Bastos M, Silva AM, Barros R, Vasconcelos C, Paiva P, Costa L, Costa PP, Mendonça D, Correia J, Silva BM. New insights of HLA class I association to Behçet's disease in Portuguese patients. ACTA ACUST UNITED AC 2008; 72:379-82. [PMID: 18627572 DOI: 10.1111/j.1399-0039.2008.01087.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Human leukocyte antigen (HLA)-B*51 is a well-known genetic factor associated with Behçet's disease (BD). To analyse the influence of HLA-B*51 and other HLA class I alleles in BD susceptibility in a Portuguese population and its association with disease severity, we studied 78 BD patients and 208 healthy controls. The patients were classified into two severity groups as described by Gul et al. As expected, a higher frequency of HLA-B*51 was found. The frequency of HLA-Cw*16 alleles was significantly higher in patients. Regarding severity, HLA-B*27 frequency was higher in the severe group compared with controls and with the mild group. Thus, HLA-B*51 and HLA-Cw*16 seem to confer susceptibility to BD in this patients. HLA-B*27 may be important as a prognostic factor.
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Affiliation(s)
- A Bettencourt
- Immunogenetics Laboratory, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Unidade Multidisciplinar de Investigação Biomédica (UMIB), Porto, Portugal.
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Neves FJ, Bousquet-Santos K, Silva BM, Soares PPS, Nóbrega ACL. Preserved heart rate variability in first-degree relatives of subjects with Type 2 diabetes mellitus without metabolic disorders. Diabet Med 2008; 25:355-9. [PMID: 18215170 DOI: 10.1111/j.1464-5491.2007.02364.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To investigate the influence of a family history of Type 2 diabetes mellitus (T2DM) on resting heart rate variability in the absence of concomitant metabolic disorders. METHODS We studied 55 first-degree relatives (FDRs) of subjects with T2DM and 36 control subjects without any known family history of diabetes. FDRs were recruited from a University Hospital out-patient diabetes clinic. The protocol included: oral glucose tolerance test (30, 60, 90 and 120 min after ingestion of 75 g glucose) blood glucose, plasma insulin, cholesterol and subfractions, triglycerides, leptin and C-reactive protein. Heart rate variability (HRV) at rest was determined by spectral analysis of interbeat intervals recorded during 10 min in the supine position. RESULTS HRV was lower in FDRs compared with control subjects (P < 0.05). Multiple regression analysis identified cholesterol (P = 0.014) and triglycerides (P = 0.014) as significant independent predictors (model r = 0.40; P < 0.001) of HRV. Since FDRs had higher values for anthropometric and metabolic variables known to alter HRV, we performed an ancova adjusted for cholesterol and triglycerides and also another analysis in which the groups were comparable for anthropometric and metabolic characteristics. Comparison of FDRs and comparable control subjects revealed no significant difference in HRV (P > 0.05). CONCLUSIONS A family history of T2DM, in the absence of concomitant metabolic disorders, does not impair heart rate variability.
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Affiliation(s)
- F J Neves
- Department of Physiology and Pharmacology & Postgraduate Programme in Cardiovascular Sciences, Federal Fluminense University, Niterói, Rio de Janeiro, RJ, Brazil
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Brunetto AF, Roseguini BT, Silva BM, Hirai DM, Guedes DP. Effects of gender and aerobic fitness on cardiac autonomic responses to head-up tilt in healthy adolescents. Pediatr Cardiol 2005; 26:418-24. [PMID: 16374693 DOI: 10.1007/s00246-004-0808-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 11/29/2022]
Abstract
Cardiovascular autonomic responses to orthostatic challenges are affected by gender and cardiorespiratory fitness in adults. However, little is know about the effects of these factors in healthy adolescents. We studied 41 adolescents (20 boys and 21 girls) aged 12-17 years, divided into aerobic fitness tertiles based on the results of a maximal treadmill exercise test. Cardiac autonomic modulation was assessed by heart rate variability (HRV) analysis of 5-minute RR interval recordings before and after 70 degrees head-up tilt maneuver. HRV was analyzed by time (TD) and frequency domain (FD) methods. TD was analyzed by standard deviation of the RR intervals and the root mean square of successive differences of RR intervals. The power spectral components were studied at low (LF) and high (HF) frequencies and as the LF/HF ratio. We did not find any differences in TD and FD measures before and after tilt in either gender or fitness groups, except for a higher heart rate response for boys. These results suggests that cardiac autonomic responses to head-up tilt in healthy adolescents are not affected by gender or aerobic fitness.
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Affiliation(s)
- A F Brunetto
- Laboratorio de Pesquisa em Fisioterapia Pulmonar, Departamento de Fisioterapia, Hospital Universitario Regional do Norte do Parana, Universidade Estadual de Londrina, PR, Brasil.
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20
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Silva BM, Andrade PB, Mendes GC, Valentão P, Seabra RM, Ferreira MA. Analysis of phenolic compounds in the evaluation of commercial quince jam authenticity. J Agric Food Chem 2000; 48:2853-2857. [PMID: 10898635 DOI: 10.1021/jf9911040] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The phenolic compounds present in 17 samples of Portuguese commercial and three homemade quince jams were analyzed by reversed-phase HPLC/DAD, to determine their authenticity. Two different extraction methods were needed for the complete definition of quince jams profiles, one of them including an Amberlite XAD-2 cleaning step. These analyses showed that all the samples presented a similar profile composed of at least eight identified phenolic compounds, several unidentified characteristic procyanidin polymers, and sodium benzoate as preservative of quince jams. Several samples also contained arbutin, suggesting that these quince jam samples were fraudulently adulterated with pear puree.
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Affiliation(s)
- B M Silva
- CEQUP/Lab. de Farmacognosia and Lab. de Bromatologia, Faculdade de Farmácia, Universidade do Porto, R. Aníbal Cunha., 4050 Porto, Portugal
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Porto G, Vicente C, Teixeira MA, Martins O, Cabeda JM, Lacerda R, Goncalves C, Fraga J, Macedo G, Silva BM, Alves H, Justiça B, de Sousa M. Relative impact of HLA phenotype and CD4-CD8 ratios on the clinical expression of hemochromatosis. Hepatology 1997; 25:397-402. [PMID: 9021953 DOI: 10.1002/hep.510250223] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Hemochromatosis is a hereditary iron-overload disease linked to HLA. The clinical expression of hemochromatosis is influenced by sex and age. However, other factors must account for the notorious heterogeneity of expression of the disease independent of sex, age, and HLA phenotype. The present study attempts to clarify some of these additional factors based on exhaustive statistical analysis of data collected from 43 selected patients with hemochromatosis. The statistical analysis focused on three groups of variables: the first group included variables reflecting the clinical expression of the disease; the second group represented the biochemical and hematological values at the time of diagnosis; and the third group consisted of the independent variables sex, age, HLA phenotype, and T-cell subset profile, i.e., the percentages and total numbers of CD4+ and CD8+ cells and the CD4-CD8 ratios. The results show that the relative expansion of the two main T-cell subsets, in the context of the HLA phenotype, correlates significantly with the clinical expression of hemochromatosis and the severity of iron overload. The present findings substantiate further the postulate that T cells have a role in the regulation of iron metabolism.
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Affiliation(s)
- G Porto
- Department of Molecular Pathology and Immunology, Abel Salazar Institute for the Biomedical Sciences, Porto, Portugal
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Silva BM. Pregnancy during residency: a look at the issues. J Am Med Womens Assoc (1972) 1992; 47:71-4. [PMID: 1624668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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