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Silva Filho AM, Costa DS, Gheyi HR, Melo AS, Silva AARD, Nunes KG, Bonou SI, Souza AR, Ferraz RLS, Nascimento R. Photosynthetic pigments and quantum yield of West Indian cherry under salt stress and NPK combinations. BRAZ J BIOL 2023; 83:e277329. [PMID: 38055508 DOI: 10.1590/1519-6984.277329] [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] [Received: 08/04/2023] [Accepted: 11/09/2023] [Indexed: 12/08/2023] Open
Abstract
West Indian cherry cultivation has proved to be an important economic activity in northeastern Brazil. However, irrigation with brackish waters limits cultivation, requiring new strategies to minimize the effect of salt stress. In this context, the present study aimed to evaluate the effect of nitrogen (N), phosphorus (P), and potassium (K) combinations on the photosynthetic pigments and quantum yield of West Indian cherry cultivated under salt stress, in the second year of production. The assay was conducted in a protected environment by adopting an experimental design in randomized blocks, with treatments distributed in a 2×10 factorial arrangement referring to two electrical conductivity levels of irrigation water - ECw (0.6 and 4.0 dS m-1) and 10 NPK fertilization combinations - FC (80-100-100; 100-100-100; 120-100-100; 140-100-100; 100-80-100; 100-120-100; 100-140-100; 100-100-80; 100-100-120, and 100-100-140% of the recommendation, in the second year of production), with three replications, each consisting of one plant. Irrigation with the electrical conductivity of 4.0 dS m-1 negatively affected the synthesis of photosynthetic pigments and the photochemical efficiency of the West Indian cherry cv. Flor Branca. The NPK combinations did not attenuate the effects of salt stress on the analyzed variables. However, the combinations referring to 120-100-100%, 140-100-100%, and 100-120-100% of NPK recommendation improved the quantum yield of photosystem II by reducing the initial fluorescence and increasing the maximum fluorescence of the West Indian cherry cv. Flor Branca.
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Affiliation(s)
- A M Silva Filho
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - D S Costa
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - H R Gheyi
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - A S Melo
- Universidade Estadual da Paraíba - UEPB, Programa de Pós-graduação em Ciências Agrárias - PPGCA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - A A R da Silva
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - K G Nunes
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - S I Bonou
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - A R Souza
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
| | - R L S Ferraz
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Tecnologia do Desenvolvimento, Campus Sumé, Sumé, PB, Brasil
| | - R Nascimento
- Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil
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Abrantes G, Almeida V, Maia AJ, Nascimento R, Nascimento C, Silva Y, Silva Y, Veras G. Comparison between Variable-Selection Algorithms in PLS Regression with Near-Infrared Spectroscopy to Predict Selected Metals in Soil. Molecules 2023; 28:6959. [PMID: 37836802 PMCID: PMC10574190 DOI: 10.3390/molecules28196959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/29/2023] [Accepted: 10/03/2023] [Indexed: 10/15/2023] Open
Abstract
Soil is one of the Earth's most important natural resources. The presence of metals can decrease environmental quality if present in excessive amounts. Analyzing soil metal contents can be costly and time consuming, but near-infrared (NIR) spectroscopy coupled with chemometric tools can offer an alternative. The most important multivariate calibration method to predict concentrations or physical, chemical or physicochemical properties as a chemometric tool is partial least-squares (PLS) regression. However, a large number of irrelevant variables may cause problems of accuracy in the predictive chemometric models. Thus, stochastic variable-selection techniques, such as the Firefly algorithm by intervals in PLS (FFiPLS), can provide better solutions for specific problems. This study aimed to evaluate the performance of FFiPLS against deterministic PLS algorithms for the prediction of metals in river basin soils. The samples had their spectra collected from the region of 1000-2500 nm. Predictive models were then built from the spectral data, including PLS, interval-PLS (iPLS), successive projections algorithm for interval selection in PLS (iSPA-PLS), and FFiPLS. The chemometric models were built with raw data and preprocessed data by using different methods such as multiplicative scatter correction (MSC), standard normal variate (SNV), mean centering, adjustment of baseline and smoothing by the Savitzky-Golay method. The elliptical joint confidence region (EJCR) used in each chemometric model presented adequate fit. FFiPLS models of iron and titanium obtained a relative prediction deviation (RPD) of more than 2. The chemometric models for determination of aluminum obtained an RPD of more than 2 in the preprocessed data with SNV, MSC and baseline (offset + linear) and with raw data. The metals Be, Gd and Y failed to obtain adequate models in terms of residual prediction deviation (RPD). These results are associated with the low values of metals in the samples. Considering the complexity of the samples, the relative error of prediction (REP) obtained between 10 and 25% of the values adequate for this type of sample. Root mean square error of calibration and prediction (RMSEC and RMSEP, respectively) presented the same profile as the other quality parameters. The FFiPLS algorithm outperformed deterministic algorithms in the construction of models estimating the content of Al, Be, Gd and Y. This study produced chemometric models with variable selection able to determine metals in the Ipojuca River watershed soils using reflectance-mode NIR spectrometry.
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Affiliation(s)
- Giovanna Abrantes
- Departamento de Química, Centro de Ciência e Tecnologia, Universidade Estadual da Paraíba, Campina Grande 58429-500, Brazil; (G.A.); (V.A.)
| | - Valber Almeida
- Departamento de Química, Centro de Ciência e Tecnologia, Universidade Estadual da Paraíba, Campina Grande 58429-500, Brazil; (G.A.); (V.A.)
| | - Angelo Jamil Maia
- Agronomy Department, Federal Rural University of Pernambuco, Recife 52171-900, Brazil; (A.J.M.); (R.N.); (C.N.); (Y.S.)
| | - Rennan Nascimento
- Agronomy Department, Federal Rural University of Pernambuco, Recife 52171-900, Brazil; (A.J.M.); (R.N.); (C.N.); (Y.S.)
| | - Clistenes Nascimento
- Agronomy Department, Federal Rural University of Pernambuco, Recife 52171-900, Brazil; (A.J.M.); (R.N.); (C.N.); (Y.S.)
| | - Ygor Silva
- Agronomy Department, Federal Rural University of Pernambuco, Recife 52171-900, Brazil; (A.J.M.); (R.N.); (C.N.); (Y.S.)
| | - Yuri Silva
- Agronomy Department, Federal University of Piauí, Bom Jesus 64900-000, Brazil;
| | - Germano Veras
- Departamento de Química, Centro de Ciência e Tecnologia, Universidade Estadual da Paraíba, Campina Grande 58429-500, Brazil; (G.A.); (V.A.)
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Moura C, Carvalho O, Gonçalves L, Cerqueira M, Nascimento R, Silva F. Laser surface texturing of Ti-6Al-4V by nanosecond laser: Surface characterization, Ti-oxide layer analysis and its electrical insulation performance. Materials Science and Engineering: C 2019; 104:109901. [DOI: 10.1016/j.msec.2019.109901] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/31/2019] [Accepted: 06/16/2019] [Indexed: 10/26/2022]
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Ribeiro TG, Novais Â, Rodrigues C, Nascimento R, Freitas F, Machado E, Peixe L. Dynamics of clonal and plasmid backgrounds of Enterobacteriaceae producing acquired AmpC in Portuguese clinical settings over time. Int J Antimicrob Agents 2019; 53:650-656. [PMID: 30878669 DOI: 10.1016/j.ijantimicag.2019.03.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 03/07/2019] [Accepted: 03/09/2019] [Indexed: 01/06/2023]
Abstract
OBJECTIVES The objective of this work was to provide detailed molecular data on clinically acquired AmpC (qAmpC)-producing Enterobacteriaceae from two different periods (2002-2008 and 2010-2013) in order to clarify the contribution of clonal and plasmid genetic platforms for the current epidemiological scenario concerning extended-spectrum beta-lactams resistance. METHODS We analysed 1246 Enterobacteriaceae non-susceptible to third-generation cephalosporins from two hospitals and one community laboratory between 2010 and 2013. Bacterial identification, antibiotic susceptibility, identification of qAmpC and plasmid-mediated quinolone resistance genes, clonal (pulsed-field gel electrophoresis (PFGE), Multilocus sequence typing (MLST)) and plasmid (S1-/I-CeuI-PFGE, replicon typing, hybridization) analysis were performed by standard methods. Whole-genome sequencing (WGS) was performed in two ST11-Klebsiella pneumoniae isolates harbouring DHA-1. RESULTS The occurrence of qAmpC was lower (2.6%) than that observed in a previous survey (7.4%), and varied slightly over time. Isolates produced DHA-1 (53%), CMY-2 (44%) or DHA-6 (3%), but significant epidemiological changes were observed in the two surveys. While DHA-1 persisted in different institutions by selection of a worldwide epidemic IncR plasmid in an ST11 harbouring KL105, CMY-2 rates increased over time linked to IncI1 plasmids (instead of IncK or IncA/C2) in multiple Escherichia coli clones. CONCLUSIONS The higher frequency of DHA-1 qAmpC in these species contrasts with the scenario in most European countries. Furthermore, the different genetic backgrounds associated with either extended-spectrum β-lactamases (ESBLs) or acquired AmpC β-lactamases (qAmpC) in our country might have contributed to their differential expansion.
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Affiliation(s)
- T G Ribeiro
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Â Novais
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - C Rodrigues
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - R Nascimento
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - F Freitas
- Centro Hospitalar Tondela-Viseu, Portugal
| | - E Machado
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal; FP-ENAS/CEBIMED. Faculdade de Ciências da Saúde, Universidade Fernando Pessoa, Porto, Portugal
| | - L Peixe
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal.
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Estruc T, Nascimento R, Siston N, Mencalha R, Abidu-Figueiredo M. Origin and main branches of the cranial and caudal mesenteric arteries in the New Zealand rabbit. ACTA ACUST UNITED AC 2018. [DOI: 10.4322/jms.081714] [Citation(s) in RCA: 3] [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: 11/23/2022]
Abstract
Abstract
Introduction: Precise knowledge of variations in arterial vascularization of the abdominal viscera is important for systematization of radiological and surgical anatomy in animals that serve as experimental models and in domestic animals. Objective: The aim of this study was to describe the origin and main branches of the cranial and caudal mesenteric arteries in rabbits. Materials and Methods: The anatomical dissections were performed in 30 cadavers of adult rabbits, 15 males and 15 females. Results: The cranial mesenteric artery arose as a single artery in all females and males. The average length of the cranial mesenteric artery in females was 2.63 cm and originated at the level oflst lumbar vertebra in two (13.33%) animals, between the 1st and 2nd lumbar vertebra in four (26.67%), on the 2nd lumbar vertebra in seven (46.67%), between 2nd and 3rd lumbar vertebra in one (6.67%) and at the level of 3rd lumbar vertebra in one (6.67%). The average length of the cranial mesenteric artery in males was 2.56 cm and originated at the level of1st lumbar vertebra in two (13.33%) animals, between the 1st and 2nd lumbar vertebra in two (13.33%), at the level of the 2nd lumbar vertebra in eight (53.33%), between the 2nd and 3rd lumbar vertebra in three (20%). The main ramifications of the cranial mesenteric artery were the caudal pancreatic duodenal, middle colic, jejunal and ileocecocolic arteries. The caudal mesenteric artery arose as a single artery in all females and males. The average length of the caudal mesenteric artery in females was 0.846 cm and originated at the level of 5th lumbar vertebra in three (20%) animals, between the 5th and 6th lumbar vertebra in two (13.33%), at the level of the 6th lumbar vertebra in seven (46.67%), %), between the 6th and 7th lumbar vertebra in two (13.33%) and at the level of the 7th lumbar vertebra in one (6.67%). The average length of the caudal mesenteric artery in males was 0.79 cm and originated at the level of the 5th lumbar vertebra in two (13.33%) animals, between the 5th and 6th lumbar vertebra in one (6.67%), at the level of the 6th lumbar vertebra in seven (46.67%), between the 6th and 7th lumbar vertebra in four (26.67%) and at the level of the 7th lumbar vertebra in one (6.67%). The caudal mesenteric artery arises from the aorta, originating the cranial rectal and left colic arteries. Conclusion: No relation was observed between the mesenteric length and the rostrum-sacral length in rabbits. The origin of the cranial and caudal mesenteric artery is not gender dependent.
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Affiliation(s)
| | - R. Nascimento
- Post-graduation Program in Animal Biology, Federal Rural University of Rio de Janeiro - UFRRJ, Rodovia BR 465, Km 7, CEP 23851-970, Seropédica, RJ, Brazil
| | - N. Siston
- Medical School, Estácio de Sá University, Rio de Janeiro, RJ, Brazil
| | - R. Mencalha
- Department of Surgery and Anesthesiology, Faculty of Veterinary Medicine, Valença Higher Education Center - CESVA, Rua Sargento Vitor Hugo, 161, Fátima, CEP 27600-000, Valença, RJ, Brazil
- Post-graduation Program in Veterinary Medicine, Federal Rural University of Rio de Janeiro - UFRRJ, Rodovia BR 465, Km 7, CEP 23851-970, Seropédica, RJ, Brazil
| | - M. Abidu-Figueiredo
- Department of Animal Biology, Animal Anatomy Area, Federal Rural University of Rio de Janeiro - UFRRJ, Rodovia BR 465, Km 7, CEP 23851-970, Seropédica, RJ, Brazil
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Thomas R, Schmidt H, Gatchell M, Rosén S, Reinhed P, Löfgren P, Brännholm L, Blom M, Björkhage M, Bäckström E, Alexander J, Leontein S, Hanstorp D, Zettergren H, Kaminska M, Nascimento R, Liljeby L, Källberg A, Simonsson A, Hellberg F, Mannervik S, Larsson M, Geppert W, Rensfelt K, Paál A, Masuda M, Halldén P, Andler G, Stockett M, Chen T, Källersjö G, Weimer J, Hansen K, Hartman H, Cederquist H. DESIREE: Physics with cold stored ion beams. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158401004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sarmento LM, Póvoa V, Nascimento R, Real G, Antunes I, Martins LR, Moita C, Alves PM, Abecasis M, Moita LF, Parkhouse RME, Meijerink JPP, Barata JT. CHK1 overexpression in T-cell acute lymphoblastic leukemia is essential for proliferation and survival by preventing excessive replication stress. Oncogene 2014; 34:2978-90. [PMID: 25132270 DOI: 10.1038/onc.2014.248] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 06/05/2014] [Accepted: 06/26/2014] [Indexed: 12/22/2022]
Abstract
Checkpoint kinase 1 (CHK1) is a key component of the ATR (ataxia telangiectasia-mutated and Rad3-related)-dependent DNA damage response pathway that protect cells from replication stress, a cell intrinsic phenomenon enhanced by oncogenic transformation. Here, we show that CHK1 is overexpressed and hyperactivated in T-cell acute lymphoblastic leukemia (T-ALL). CHEK1 mRNA is highly abundant in patients of the proliferative T-ALL subgroup and leukemia cells exhibit constitutively elevated levels of the replication stress marker phospho-RPA32 and the DNA damage marker γH2AX. Importantly, pharmacologic inhibition of CHK1 using PF-004777736 or CHK1 short hairpin RNA-mediated silencing impairs T-ALL cell proliferation and viability. CHK1 inactivation results in the accumulation of cells with incompletely replicated DNA, ensuing DNA damage, ATM/CHK2 activation and subsequent ATM- and caspase-3-dependent apoptosis. In contrast to normal thymocytes, primary T-ALL cells are sensitive to therapeutic doses of PF-004777736, even in the presence of stromal or interleukin-7 survival signals. Moreover, CHK1 inhibition significantly delays in vivo growth of xenotransplanted T-ALL tumors. We conclude that CHK1 is critical for T-ALL proliferation and viability by downmodulating replication stress and preventing ATM/caspase-3-dependent cell death. Pharmacologic inhibition of CHK1 may be a promising therapeutic alternative for T-ALL treatment.
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Affiliation(s)
- L M Sarmento
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - V Póvoa
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - R Nascimento
- Infections and Immunity Laboratory, Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - G Real
- 1] iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal [2] Instituto de Tecnologia Química e Biológica, Oeiras, Portugal
| | - I Antunes
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - L R Martins
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - C Moita
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - P M Alves
- 1] iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal [2] Instituto de Tecnologia Química e Biológica, Oeiras, Portugal
| | - M Abecasis
- Cardiologia Pediátrica Medico-Cirúrgica, Hospital Sta. Cruz, Carnaxide, Lisbon, Portugal
| | - L F Moita
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - R M E Parkhouse
- Infections and Immunity Laboratory, Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - J P P Meijerink
- Department of Pediatric Oncology/Hematology, Erasmus MC/Sophia Children's Hospital, Rotterdam, The Netherlands
| | - J T Barata
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
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Carneiro AP, Reis CF, Morari EC, Maia YCP, Nascimento R, Bonatto JMC, de Souza MA, Goulart LR, Ward LS. A putative OTU domain-containing protein 1 deubiquitinating enzyme is differentially expressed in thyroid cancer and identifies less-aggressive tumours. Br J Cancer 2014; 111:551-8. [PMID: 24937664 PMCID: PMC4119988 DOI: 10.1038/bjc.2014.331] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 03/20/2014] [Accepted: 05/15/2014] [Indexed: 12/22/2022] Open
Abstract
Background: This study aimed to identify novel biomarkers for thyroid carcinoma diagnosis and prognosis. Methods: We have constructed a human single-chain variable fragment (scFv) antibody library that was selected against tumour thyroid cells using the BRASIL method (biopanning and rapid analysis of selective interactive ligands) and phage display technology. Results: One highly reactive clone, scFv-C1, with specific binding to papillary thyroid tumour proteins was confirmed by ELISA, which was further tested against a tissue microarray that comprised of 229 thyroid tissues, including: 110 carcinomas (38 papillary thyroid carcinomas (PTCs), 42 follicular carcinomas, 30 follicular variants of PTC), 18 normal thyroid tissues, 49 nodular goitres (NG) and 52 follicular adenomas. The scFv-C1 was able to distinguish carcinomas from benign lesions (P=0.0001) and reacted preferentially against T1 and T2 tumour stages (P=0.0108). We have further identified an OTU domain-containing protein 1, DUBA-7 deubiquitinating enzyme as the scFv-binding antigen using two-dimensional polyacrylamide gel electrophoresis and mass spectrometry. Conclusions: The strategy of screening and identifying a cell-surface-binding antibody against thyroid tissues was highly effective and resulted in a useful biomarker that recognises malignancy among thyroid nodules and may help identify lower-risk cases that can benefit from less-aggressive management.
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Affiliation(s)
- A P Carneiro
- Laboratory of Cancer Molecular Genetics, Faculty of Medical Sciences (FCM), University of Campinas (Unicamp), Campinas, SP, Brazil
| | - C F Reis
- Laboratory of Cancer Molecular Genetics, Faculty of Medical Sciences (FCM), University of Campinas (Unicamp), Campinas, SP, Brazil
| | - E C Morari
- Laboratory of Cancer Molecular Genetics, Faculty of Medical Sciences (FCM), University of Campinas (Unicamp), Campinas, SP, Brazil
| | - Y C P Maia
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry (Ingeb), Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - R Nascimento
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry (Ingeb), Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - J M C Bonatto
- Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil
| | - M A de Souza
- Laboratory of Molecular Biology, Federal University of Uberlandia, Institute of Biomedical Sciences, Uberlandia, MG, Brazil
| | - L R Goulart
- 1] Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry (Ingeb), Federal University of Uberlandia, Uberlandia, MG, Brazil [2] Department of Medical Microbiology and Immunology, University of California-Davis, Davis, CA, USA
| | - L S Ward
- Laboratory of Cancer Molecular Genetics, Faculty of Medical Sciences (FCM), University of Campinas (Unicamp), Campinas, SP, Brazil
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Nascimento R, Lopes C, Freitas F, Azevedo P, Bárbara C. 144 The impact of Pseudomonas aeruginosa colonization in CF. J Cyst Fibros 2014. [DOI: 10.1016/s1569-1993(14)60280-0] [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: 11/30/2022]
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Abstract
Viruses depend on host cell resources for replication and access to those resources may be limited to a particular phase of the cell cycle. Thus manipulation of cell cycle is a commonly employed strategy of viruses for achieving a favorable cellular environment. For example, viruses capable of infecting nondividing cells induce S phase in order to activate the host DNA replication machinery and provide the nucleotide triphosphates necessary for viral DNA replication (Flemington in J Virol 75:4475-4481, 2001; Sullivan and Pipas in Microbiol Mol Biol Rev 66:179-202, 2002). Viruses have developed several strategies to subvert the cell cycle by association with cyclin and cyclin-dependent kinase complexes and molecules that regulate their activity. Viruses tend to act on cellular proteins involved in a network of interactions in a way that minimal protein-protein interactions lead to a major effect. The complex and interactive nature of intracellular signaling pathways controlling cell division affords many opportunities for virus manipulation strategies. Taking the maxim "Set a thief to catch a thief" as a counter strategy, however, provides us with the very same virus evasion strategies as "ready-made tools" for the development of novel antivirus therapeutics. The most obvious are attenuated virus vaccines with critical evasion genes deleted. Similarly, vaccines against viruses causing cancer are now being successfully developed. Finally, as viruses have been playing chess with our cell biology and immune responses for millions of years, the study of their evasion strategies will also undoubtedly reveal new control mechanisms and their corresponding cellular intracellular signaling pathways.
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Affiliation(s)
- R Nascimento
- Instituto Gulbenkian de Ciencia, Oeiras, Portugal.
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Costa H, Nascimento R, Sinclair J, Parkhouse RME. CS04-3. Mechanism of IL-8 induction by HCMV UL76 protein. Cytokine 2011. [DOI: 10.1016/j.cyto.2011.07.325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Nascimento R, Costa H, Dias JD, Parkhouse RME. MHV-68 Open Reading Frame 20 is a nonessential gene delaying lung viral clearance. Arch Virol 2010; 156:375-86. [PMID: 21104281 DOI: 10.1007/s00705-010-0862-2] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Accepted: 11/08/2010] [Indexed: 11/24/2022]
Abstract
Recently, it has been demonstrated that the MHV-68 ORF20-encoded gene product induces cell-cycle arrest at the G2/M phase, followed by apoptosis. To study the role of this conserved gene in vivo, two independent ORF20-deficient MHV-68 viruses and their revertants were constructed. As the replication in vitro of both mutants followed similar kinetics to that of the wild-type and revertant viruses, ORF20 is therefore a nonessential virus gene. No cell cycle arrest could be observed upon infection of cells with wild type MHV-68 or mutant viruses. In addition, no major differences were detected between mock- and virus-infected cells when protein and inactivation levels of the mitotic promoter factor cdc2/cyclinB were analyzed. Following intranasal infection, the recovery of mutant, revertant and wild-type viruses in the lungs was similar. With the ORF20-deficient viruses, however, there was a significant delay of four days in clearance of virus from the lungs. Surprisingly, the magnitude and cell population distribution in the exudates of the lung was essentially similar to mice infected with wild-type, revertant or ORF20-deleted viruses. Subsequent establishment of latency was normal for both mutants, demonstrating that ORF20 does not play a critical role in establishment of a persistent infection. These results indicate that while expression of ORF20 may impact on the pathogenicity of the infection, the observed induction of G2/M arrest in ORF20-expressing cells may not be the primary function of ORF20 in the context of viral infection.
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Affiliation(s)
- R Nascimento
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande nº6, Apartado 14, 2779-558 Oeiras, Portugal
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Prudencio CR, Nascimento R, Filho MM, Marra ADOM, Souza GRLD, Almeida JF, Cardoso R, Szab MPJ. In silico analysis for identifcation of tick phagotopes selected by phage-displayed libraries. RBPV 2009. [DOI: 10.4322/rbpv.01801007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Roseghini R, Rocha DS, Clarêncio J, Costa SL, Costa MFD, Tardy M, Nascimento R, Schaer R, Velozo E, Meyer R, Freire S. Flavonoid Rutin Alters the Viability and Function of Mitogen-Stimulated Splenocytes and Thymocytes Compared with Non Stimulated Cells. Immunopharmacol Immunotoxicol 2008; 29:271-85. [PMID: 17849271 DOI: 10.1080/08923970701512940] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 10/22/2022]
Abstract
Rutin is a flavonoid obtained from Dimorphandra mollis (Benth.), a medicinal Brazilian plant used as antioxidative, antihemorrhagic, and blood vessel protector. The present study has examined its effects on the viability and function of immune system cells in vitro. Rat spleen and thymus cells were cultured with 10 nM, 1 microM, and 10 microM of the drug in the presence or absence of PWM, LPS, or ConA mitogens. Cellular proliferation was analyzed by H(3)-thymidin uptake and IFN-gamma and IL-10 were measured by ELISA after 48 and 72 hr. Viability was measured by flow cytometry using Annexin V and PI after 24 and 48 hr. The flavonoid rutin inhibited splenocytes and thymocytes proliferation under ConA stimulation observed by an increase on apoptosis levels of thymocytes stimulated with PWM in 24 hr and on splenocytes stimulated with PWM in 48 hr. Function studies showed a decrease on IFN-gamma production by splenocytes and thymocytes stimulated with PWM or ConA. Spleen cells cultured with LPS and rutin showed a decrease on apoptosis after 24 hr and an increase on the IL-10 levels after 48 hr. There was no significant variation on the necrosis rate, viability, and function of cells treated with rutin in the absence of mitogenic stimulus.
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Affiliation(s)
- R Roseghini
- Programa de Pós-Graduação em Imunologia, Universidade Federal da Bahia, Bahia, Brazil.
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Abstract
The objective of this work was to identify novel viral 'evasion' genes without homology in the database through functional assays. Using this approach, the 'unassigned', conserved murine gammaherpesvirus ORF20 gene was shown to localize in the nucleus and to induce cell-cycle arrest followed by apoptosis in both mouse and human cells. Such growth-arrested cells did not express phospho-histone H3, demonstrating that the virus protein caused arrest at the G2 stage of the cell cycle. To characterize the mechanism further, Western blots of ORF20-recombinant lentivirus-infected cells were developed with antibodies to cyclin B1, Cdc2 and phospho-Tyr-15-Cdc2. This analysis revealed a relative increase in cyclin B and phospho-Tyr-15-Cdc2, from 24 to 72 h after infection with recombinant lentivirus. The demonstration that Cdc2 is in its inactive phosphorylated form and the clearly increased levels of cyclin B indicated that the virus gene blocks the progression of cells into mitosis by acting at the level of the Cdc2-cyclin B complex. To confirm this result, the Cdc2-cyclin B complex in ORF20-expressing cells was shown to be essentially without kinase activity. As the ORF20 gene is conserved in all herpesvirus, it may be presumed to have evolved to fulfil an important, as yet undefined, biological role in host-cell modification.
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Affiliation(s)
- R Nascimento
- Instituto Gulbenkian de Ciência, Apartado 14, Oeiras, Portugal
| | - R M E Parkhouse
- Instituto Gulbenkian de Ciência, Apartado 14, Oeiras, Portugal
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Teixeira AR, Monteiro PS, Rebelo JM, Argañaraz ER, Vieira D, Lauria-Pires L, Nascimento R, Vexenat CA, Silva AR, Ault SK, Costa JM. Emerging Chagas disease: trophic network and cycle of transmission of Trypanosoma cruzi from palm trees in the Amazon. Emerg Infect Dis 2001; 7:100-12. [PMID: 11266300 PMCID: PMC2631687 DOI: 10.3201/eid0701.700100] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
A trophic network involving molds, invertebrates, and vertebrates, ancestrally adapted to the palm tree (Attalaea phalerata) microhabitat, maintains enzootic Trypanosoma cruzi infections in the Amazonian county Paço do Lumiar, state of Maranhão, Brazil. We assessed seropositivity for T. cruzi infections in the human population of the county, searched in palm trees for the triatomines that harbor these infections, and gathered demographic, environmental, and socioeconomic data. Rhodnius pictipes and R. neglectus in palm-tree frond clefts or in houses were infected with T. cruzi (57% and 41%, respectively). Human blood was found in 6.8% of R. pictipes in houses, and 9 of 10 wild Didelphis marsupialis had virulent T. cruzi infections. Increasing human population density, rain forest deforestation, and human predation of local fauna are risk factors for human T. cruzi infections.
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Affiliation(s)
- A R Teixeira
- Chagas' Disease Multidisciplinary Research Laboratory, Faculty of Medicine, University of Brasília, P.O. Box 04536, Postcode 70.919.970, Brasília, DF, Brazil.
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Nascimento R, Freitas A, Pereira D, Pereira E, Cardoso A, Mendonça I, Diniz M. [Influence of the equality of ventricular pressure in the echocardiographic determination of the ejection fraction of the left ventricle]. Rev Port Cardiol 1999; 18:347-56. [PMID: 10371843] [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: 02/12/2023] Open
Abstract
OBJECTIVES Limited data have been reported concerning the influence of right ventricular systolic overload on the accuracy of the 2D echocardiographic (echo) determination of left ventricular (LV) ejection fraction (EF). The normal newborn at birth (high pulmonary peak systolic pressure) and just after the fall of pulmonary pressure, represent an in vivo model to study this influence. This study compares the LVEF determined by recommended 2D echocardiographic algorithms with that by 3D echo, in newborns at birth and just after the normal fall of right ventricular systolic pressure. METHODS 100 echocardiographic studies (50 at 2 to 6 hours after birth--group I; and 50 at 7 to 14 days old--control group) were performed in 82 normal newborns, to determine LVEF by 4 geometric models (cylinder hemiellipsoid; ellipsoid biplane; single plane area length, in 4- and 2-chamber view; biplane method of discs) and visual estimation, using 3D echocardiography as the reference method. RESULTS In group I, the correlation between 3D echo and cylinder hemiellipsoid was r = 0.62 (SEE = 4.5%); ellipsoid biplane, r = 0.69 (SEE = 4.1%); single plane area length, 4 chambers, r = 0.66 (SEE = 5.1%) and, 2 chambers, r = 0.72 (SEE = 4.0%); biplane method of discs, r = 0.83 (SEE = 3.6%), and, visual estimation, r = 0.78 (SEE = 3.5%). In the control group, the correlation between 3D echo and cylinder hemiellipsoid was r = 0.70 (SEE = 3.4%); ellipsoid biplane, r = 0.63 (SEE = 3.4%); single plane area length, 4 chambers, r = 0.79 (SEE = 3.5%) and, 2 chambers, r = 0.76 (SEE = 4.1%); biplane method of discs, r = 0.90 (SEE = 2.3%), and, visual estimation, r = 0.64 (SEE = 3.9%). IN CONCLUSION These data suggest that the biplane method of discs and single plane area length using 2-chamber view allows a more accurate LVEF determination when significant right ventricular pressure overload is present.
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Nascimento R, Pereira D, Freitas A, Pereira E, Mendonça I, Dinis M. Comparison of left ventricular ejection fraction in congenital heart disease by visual versus algorithmic determination. Am J Cardiol 1997; 80:1331-5. [PMID: 9388108 DOI: 10.1016/s0002-9149(97)00674-7] [Citation(s) in RCA: 9] [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: 02/05/2023]
Abstract
Two-dimensional (2D) echocardiographic visual estimation of left ventricular (LV) ejection fraction (EF) in patients with acquired heart disease yields results that are comparable to those obtained by recommended algorithms. However, there is no information concerning its accuracy in congenital heart disease. This study compares applicability, accuracy, and reproducibility of LVEF by visual estimation with that by currently used algorithms (cylinder hemiellipsoid, ellipsoid biplane, and biplane method of disks) in 92 consecutive patients with congenital heart disease but unrepaired complete atrioventricular septal defect, univentricular heart, and hypoplastic left ventricle, using 3D echocardiography as the reference method. Visual estimation of LVEF could be applied in all cases. Because of technically inadequate 2D echocardiographic images for volume measurement, analysis for comparison could be performed in 71 patients (77%), aged 1 day to 47 years. The correlation between 3D echocardiographic and visual estimation was 0.91 (SEE 3.3%), cylinder hemiellipsoid, 0.86 (SEE 3.9%), ellipsoid biplane 0.87 (SEE 3.9%), and biplane method of disks 0.93 (SEE 3.2%). Intraobserver variability was similar for all 2D echo methods. Interobserver variability was greater for visual estimation. In conclusion, visual estimation of LVEF is applicable to most patients with congenital heart disease, yielding results that are comparable to those obtained by currently used 2D echocardiographic algorithms.
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Affiliation(s)
- R Nascimento
- Serviço de Cardiologia, Centro Hospitalar do Funchal, Portugal
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Amodeo C, Giorgi DM, Mion D, Nobre F, Chaves Júnior H, Gomes MA, Atie CS, Pascoal IJ, Malachias MV, Passaro LC, Zanela MT, Santelo JL, Wajngarten M, Lima EG, Ribeiro JM, Jardim PC, Lima Júnior E, Nascimento R, Introcaso L, Koch V. [II Brazilian Consensus of Ambulatory Blood Pressure Monitoring]. Arq Bras Cardiol 1997; 69:359-67. [PMID: 9609004 DOI: 10.1590/s0066-782x1997001100011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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20
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Abstract
The prevalence of mitral valve prolapse (MVP) at birth was studied in 1,734 consecutive newborns without congenital structural heart disease. We have not identified any case of an unequivocal pattern of MVP using auscultatory and echocardiographic diagnostic criteria. Our data argue for the concept that MVP is an acquired disease.
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Affiliation(s)
- R Nascimento
- Unidade de Cardiologia Pedíatrica, Servico de Cardiologia, Centro Hospitalar do Funchal, Portugal
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Lourenço A, Quelhas I, Varandas L, Machado I, Reis F, Sousa F, Sanfins V, Carvalho S, Pereira A, Gonçalo L, Almeida J, Nascimento R. [Echocardiographic evaluation of the aortic and pulmonary valve areas in the newborn infant. Normal patterns]. Rev Port Cardiol 1996; 15:225-9, 182. [PMID: 8634171] [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: 02/01/2023] Open
Abstract
OBJECTIVES To determine normal values of the aortic and pulmonary functional valve areas in healthy newborn children. MATERIAL AND METHODS We prospectively studied 32 newborns (17 boys) who were included in the following criteria: healthy parents, normal pregnancy, eutocic delivery, Apgar index 10 at 5 minutes weight between 2.500 and 4.000 kg, normal physical and echocardiographical examinations. The echocardiographical examination was executed during the first 48 hours of life. We used the continuity equation to calculate the aortic and pulmonary functional valve areas. As a reference we used the anatomic (pi r2) aortic and pulmonary valve areas, calculated in the bidimensional images from the distance measured between the two insertion points of the sigmoid valves. RESULTS We had echocardiographic images and Doppler registrations of excellent quality, in all the newborn children. The functional pulmonary valve area ranged between 0.30 and 0.50 cm2 (mean +/- SD = 0.41 +/- 0.06) and the anatomical one ranged between 0.29 and 0.49 cm2 (mean +/- SD = 0.49 +/- 0.05), without statistical significance and with a correlation index 0.92. The functional aortic valve area ranged between 0.20 and 0.40 cm2 (mean +/- SD = 0.31 +/- 0.05) and the anatomical ranged between 0.21 and 0.36 cm2 (mean +/- SD = 0.29 +/- 0.05), without statistical significance and with a correlation index 0.91. CONCLUSION There is a good correlation between the functional aortic and pulmonary valve areas, calculated from the continuity equation, and the anatomical ones. These values will be useful in characterizing the critical stenosis of the newborn child with decreased ventricular function, where the transvalvular gradient is inaccurate in the quantification of the obstruction.
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Affiliation(s)
- A Lourenço
- Laboratório de Ecocardiografia, Serviço de Cardiologia, Hospital da Senhora da Oliveria, Guimarães
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Mesquita A, Almeida M, Adragão P, Neves J, Morgado F, Parreira L, Nascimento R, Araújo JJ, Mendes M, Bonhorst D, Martins M, Seabra-Gomes R. [Exertion syncopal crisis in the young, associated with idiopathic long QT syndrome]. Rev Port Cardiol 1996; 15:45-55. [PMID: 8703503] [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: 02/01/2023] Open
Abstract
The cases of two young patients with repetitive syncopal attacks due to idiopathic long QT syndrome (ILQTS) are reported. Both had been primarily misdiagnosed for seizures. In one of the cases the QT interval in the ECG at rest was normal. The same patient had a previous episode of cardiac arrest with ventricular fibrillation. The treadmill stress test was of great value, revealing polymorphic ventricular tachycardia induced by exercise, and evaluating the efficacy of beta-blocking therapy in the follow-up. The ILQTS should be considered a possible etiology in any patient presenting with new onset seizures, especially in the young. The treatments were different in both cases. In the first one, the treatment with nadolol (100 mg od) revealed to be very effective with total remission of symptoms. The treadmill stress test performed 15 days after the beginning of treatment did not show any ventricular arrhythmias, and it was assumed that the patient was effectively protected against ventricular arrhythmias. After 4.5 months of follow up, no syncopal episodes occurred. In the second case due to young age, the frequency, and the severity of the attacks (cardiac arrest with ventricular fibrillation), and the inefficacy of beta-adrenergic-blocking agents, the implantable cardioversor-defibrillator was the treatment chosen, although the beta blocking therapy was maintained to reduce the number of arrhythmic events. The ILQTS is a rare anomaly related to sudden cardiac death. The ILQTS is characterised by the association of several distinctive electrocardiographic features, among which prolongation of the QT interval is the best known. Life-threatening arrhythmia occurs usually under conditions of physical or psychological stress. Relatively effective therapies do exist and are represented by antiadrenergic interventions: beta-adrenergic-blocking agents are the treatment of choice. When they fail, left sympathetic denervation or the automatic implantable cardioversor-defibrillator have also proved to be effective.
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Affiliation(s)
- A Mesquita
- Interno do Internato Complementar de Cardiologia, Serviço de Cardiologia do Hospital de Santa Cruz
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Pereira D, Nascimento R, Freitas A, Pereira E, Drumond A, Sousa A, Silva J, Sousa S, Araújo J, Cardoso A. [The advantage of determining left ventricular ejection fraction by three-dimensional echocardiography during the equalization of the ventricular pressures]. Rev Port Cardiol 1995; 14:943-6. [PMID: 8541082] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- D Pereira
- Centro Hospitalar do Funchal (C.H.F.), Madeira
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Nascimento R, Campelo M, Maciel J, Lourenço A, Carneiro M, Cunha D, Van-Zeller P. [Echocardiographic evaluation of pulmonary valve stenosis for valvuloplasty in children and adults]. Rev Port Cardiol 1993; 12:141-50. [PMID: 8461154] [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: 01/30/2023] Open
Abstract
OBJECTIVES 1--To determine the accuracy of the echocardiographic selection and characterization of the pulmonary stenosis (PS) for balloon valvuloplasty; 2--To analyze the differences between children and adults in obtaining the echocardiographic parameters used for pulmonary stenosis characterization. MATERIAL AND METHODS We studied 53 consecutive patients with PS and a peak Doppler gradient > or = 40 mmHg, submitted to cardiac catheterization to perform balloon valvuloplasty if the right ventricle to pulmonary artery peak-to-peak systolic pressure gradient was > or = 40 mmHg. The patients were divided into 3 groups on the basis of age: < or = 5 years (group 1; n = 18), 6-16 years (group 2; n = 17) and > 16 years (group 3; n = 18). A complete echocardiographic study was performed including identification of valvular morphology (commissural fusion, dysplasia or mixed), determination of right ventricle to pulmonary artery peak Doppler gradient and the transducer position that yielded the highest transvalvular flow velocity (V), evaluation of the right ventricular outflow tract morphology and measurement of the valvular annulus diameter. RESULTS Technically adequate recordings were obtained in all patients. Fifty patients (94%) were submitted to pulmonary valvuloplasty. The echo-Doppler recording of V was obtained from the parasternal position in 27 patients (51%), suprasternal in 14 (26%), subcostal in 10 (19%) and apical in 2. In group 1, the V was obtained from the suprasternal position in 8 patients (44%), subcostal in 5 (28%), parasternal in 4 (22%) and apical in 1. In group 2, it was the parasternal position in 8 patients (47%), suprasternal in 6 (35%), subcostal in 2 (12%) and apical in 1. In group 3, it was the parasternal position in 15 patients (83%) and subcostal in 3. The peak Doppler gradient ranged from 40 to 215 mmHg (mean +/- SD = 78 +/- 37) and the peak-to-peak gradient at cardiac catheterization from 32 to 220 mmHg (mean +/- SD = 81 +/- 41). The correlation between eco-Doppler peak gradient and peak-to-peak gradient at cardiac catheterization was r = 0.95 (SEE = 12 mmHg) being, for group 1, r = 0.89 (SEE = 14 mmHg), for group 2, r = 0.97 (SEE = 8 mmHg) and, for group 3, r = 0.98 (SEE = 10 mmHg). The right ventricular outflow tract shows dynamic reaction 48 patients. Two patients had an infundibular gradient > 25 mmHg, significantly underestimated by echo-Doppler in one. All 5 patients (9%) but one with angiographic criteria for valvular dysplasia, were identified by echocardiography. One patient had a mixed form. The remaining 47 patients had valvular commissural fusion. The annulus size measured by echocardiography ranged from 10 to 28 mm (mean +/- SD = 17.7 +/- 4.3) and by angiography from 10 to 28 mm (mean +/- SD = 17.6 +/- 4.4). Close correlations were found between echocardiographic and angiographic measurements: r = 0.97 (SEE = 1.1 mm) being, for group 1, r = 0.90 (SEE = 1.1 mm), for group 2, r = 0.94 (SEE = 0.8 mm) and, for group 3, r = 0.87 (SEE = 1.3 mm). CONCLUSION The echocardiographic examination allows an accurate selection and characterization of the PS for balloon valvuloplasty. The most significant difference in the study of PS in children and adults, was the lack in the ability of the eco-Doppler to record the V from the suprasternal position in adults. 2D echocardiography can reliably measure the annulus diameter in children and adults, providing precise information for balloon diameter selection before valvuloplasty.
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Affiliation(s)
- R Nascimento
- Unidade de Cardiologia Pediátrica, Centro Hospitalar do Funchal, Hospital de São João, Porto
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Bastos P, Nascimento R, de Sousa AR, Pinho P, Cunha D, Gomes MR. [Surgical treatment of ventricular septal defect in the first year of life]. Rev Port Cardiol 1992; 11:339-45. [PMID: 1632989] [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: 12/28/2022] Open
Abstract
Forty six infants with a large ventricular septal defect (VSD) underwent surgical treatment during the first 12 months of life. Forty three patients ranging in age from 3 to 12 months (mean age 10.4 months) and weighting from 3.0 to 8.2 kg (mean weight 6.8 kg) had primary surgical closure of their VSD. All infants were below the third percentile for weight preoperatively. In 40 patients (93%) the defect was closed through the right atrium. Three patients (7.0%) died in the early postoperative period. Surgically induced heart block occurred in one patient (2.3%). Late results were assessed in 29 surgical survivors (mean follow-up 26 months). There was no late mortality. Relief of congestive heart failure was prompt in all patients following closure of VSD. Right bundle branch block with left anterior hemiblock developed in 5 patients (17.2%), and right bundle branch block alone in 10 patients (34.5%). Three patients (mean age 4.3 months, mean weight 2.7 kg) underwent initial palliative pulmonary artery banding (PAB). There were no operative or late mortality. Closure of VSD and pulmonary artery debanding was performed in two of these patients, with no mortality. Prior to intracardiac correction the pulmonary artery pressure distal to the band was normal; no band related complications were found. Early primary closure is the treatment of choice for symptomatic infants with large VSDs. In particular circumstances, however, PAB may provide effective palliation.
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Affiliation(s)
- P Bastos
- Centro de Cirurgia Torácica, Faculdade de Medicina, Hospital de São João, Porto
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Nascimento R, Bastos P, Torres S, Campelo M, Pereira M, de Sousa AR, Van-Zeller P, Gomes MR, Cunha D. [Echocardiographic assessment of interventricular septal defect corrected during the first year of life]. Rev Port Cardiol 1992; 11:347-54. [PMID: 1632990] [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: 12/28/2022] Open
Abstract
OBJECTIVE To evaluate the medium term results of surgical closure of ventricular septal defect (VSD) performed during the first year of life, using echocardiography (echo). MATERIAL AND METHODS We studied prospectively 29 patients aged from 17 to 68 months (mean = 37) who underwent surgical closure of perimembranous VSD during the first year of life. The postoperative follow-up time ranged from 6 to 60 months (mean = 26). Fifteen age-matched normal children were used as a control group in evaluating the left ventricular (LV) systolic function. The echo study included: 1) the assessment of LV systolic function using the shortening fraction, ejection fraction, pre-ejection to ejection time ratio (PET/ET), aortic flow acceleration time, acceleration to ejection time ratio, mean aortic flow acceleration; 2) detection and quantification of residual VSD as well as tricuspid and or aortic regurgitation; 3) determination of right ventricular systolic pressure (RVSP). The RVSP was evaluated from the maximum flow velocity from a residual VSD or tricuspid regurgitation, using the simplified Bernoulli equation. RESULTS The LV systolic function parameters from patients versus (vs) normals showed a significantly different shortening fraction (34 +/- 5 vs 39 +/- 4; p = 0.005) and PET/ET ratio (0.34 +/- 0.04 vs 0.31 +/- 0.03; p = 0.02). None of the other studied parameters was significantly different from normal. Five (17%) patients had a small residual VSD. Two (7%) patients had mild aortic regurgitation. Tricuspid regurgitation was detected in 23 (79%) patients being trivial in 20 and mild to moderate in 3. The RVSP was quantified in 22 (76%) patients, ranging from 30 to 45 mmHg (mean +/- SD = 36 +/- 4). None of the remaining 7 patients showed changes in the end-systolic interventricular septal configuration. CONCLUSIONS Our study shows that surgical closure of perimembranous VSD performed during the first year of life was possible without significant mobility. Furthermore, the echo allowed a complete and noninvasive cardiac evaluation of the anatomic, functional and hemodynamic status of this group of patients, thus limiting the need for postoperative control cardiac catheterization.
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Affiliation(s)
- R Nascimento
- Unidade de Cardiologia Pediátrica, Hospital de S. João, Porto
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27
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Nascimento R, Cunha DL, Bastos P, VanZeller P, Rodrigues-Gomes M. Echo-Doppler study of right ventricular filling in asymptomatic patients with Senning operation for transposition of the great arteries. Am J Cardiol 1991; 68:693-5. [PMID: 1877495 DOI: 10.1016/0002-9149(91)90372-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- R Nascimento
- Unidade de Cardiologia Pediátrica, Porto, Portugal
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Nascimento R, Jimenez M, Choussat A. [Pre- and post-operative echocardiographic evaluation of the anomalous origin of the left coronary artery from the pulmonary trunk]. Rev Port Cardiol 1990; 9:601-6. [PMID: 2271214] [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: 12/31/2022] Open
Abstract
OBJECTIVE Pre and postoperative Doppler echocardiographic assessment of the anomalous origin of the left coronary artery from the pulmonary trunk (OLCAPT). MATERIAL AND METHODS We analyzed Doppler echocardiographic diagnostic signs, the potential for recovery of left ventricular (LV) function and mitral regurgitation (MR) in 4 patients with OL-CAPT, treated by direct aortic implantation. The age at surgery ranged from 1 to 10 years and the follow-up from 3 months to 6 years. Doppler echocardiographic diagnostic study was performed at the first examination whereas LV function and MR were studied before (3 to 8 days) and serially after surgery. RESULTS The OLCAPT was visualized in 3 patients and the retrograde flow from the anomalous left coronary in 1. An important right coronary artery dilation was present in 2 patients, being moderate in a third patient. Before surgery, the LV shortening fraction ranged from 17 to 23% and the ejection fraction from 23 to 36%. The qualitative analysis of segmental LV wall motion showed septal akinesis and hypokinesis of the remaining segments. Nine to 12 months after surgery, global and regional indexes of LV function improved, reaching the normal range except for the interventricular septum. In 2 patients with more than 2 years of follow-up, complete normalization of LV function was obtained, as well as with the electrocardiographic features of an old myocardial infarction in one case and a marked decrease in Q wave depth in the other. A moderate to severe MR was detected in all patients which improved markedly after surgery in 3. In the other case, a mitral replacement was necessary. CONCLUSION Doppler echocardiography allowed: 1. the anatomic diagnosis in 3 of 4 patients with OLCAPT; 2. to follow global and regional LV function and MR improvement after direct aortic implantation of the anomalous left coronary artery.
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Affiliation(s)
- R Nascimento
- Serviço de Cardiologia Pediátrica, Hôpital Cardiologique, Bordeaux, France
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Nascimento R, Bastos PT, Van Zeller P, Cunha D. [Significance of Doppler echocardiography in the diagnosis and management of children with heart disease]. Rev Port Cardiol 1990; 9:303-9. [PMID: 2386632] [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: 12/31/2022] Open
Abstract
OBJECTIVE To assess the accuracy of Doppler-echocardiography in the diagnosis and management of the child with heart disease. MATERIAL AND METHODS Prospective echocardiographic study of 132 consecutive patients aged 1 day to 16 years old with heart disease confirmed by cardiac catheterization (n = 109) or anatomic examination (surgical = 21, necropsy = 2). RESULTS Of the 258 cardiovascular anomalies diagnosed by cardiac catheterization and anatomical examination, 247 were correctly identified by echocardiography (sensitivity = 96%). There were 11 missed and 4 false positive diagnosis (specificity = 98%), all of them were vascular anomalies. Intracardiac anatomy and segmentary alignment were always correctly identified. The 21 cardiovascular anomalies operated without cardiac catheterization were correctly diagnosed. In 16 patients (12%) a management plan could not be established only on clinical echocardiographic grounds and, in another patient, the plan was incomplete. In the remaining 115 patients (87%) the management plan was correct and complete. CONCLUSIONS The clinical-echocardiographic study allows: 1) an excellent anatomo-functional evaluation of the heart and great vessels, 2) surgical repair of some selected cardiovascular anomalies without previous cardiac catheterization.
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Affiliation(s)
- R Nascimento
- Unidade de Cardiologia Pediátrica, Hospital de S. João, Porto
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Nascimento R, Cunha D, Bastos PT, Van Zeller P, Gomes MR. [Echocardiographic evaluation of simple transposition of great vessels subjected to physiologic correction]. Rev Port Cardiol 1989; 8:761-7. [PMID: 2631824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The aim of the present study was to evaluate the cardiovascular morphology after Senning's operation for transposition of the great vessels (TGV) using Döppler-echocardiography. The study included 25 patients (pts) aged 17 to 127 months (mean = 60 +/- 27) who were evaluated 6 to 112 months (mean = 42 +/- 27) after surgery. The following parameters were analysed: right (RV) and left ventricular (LV) morphology and function; tricuspid regurgitation and its severity; caval and pulmonary venous pathways and the presence of pulmonary stenosis, its type and severity. All the 25 pts had an abnormal end-systolic interventricular septal (IVS) configuration, with left convexity in 22 (88%) and a flat septum present in 3 (12%). The LV fractional shortening (FS) ranged from 25 to 60% (mean = 41 +/- 10) and the preejection/ejection time ratio (PET/ET) from 0.18 to 0.33 (mean = 0.24 +/- 0.04). The RV mean FS ranged from 23.0 to 32.5% (mean = 26.9 +/- 3.0) and PET/ET from 0.27 to 0.46 (mean = 0.38). The RV wall motion study revealed that the IVS was hypokinetic in 3 pts (12%), akinetic in 19 (76%) and dyskinetic in 3 (12%). Three pts also had an hypokinetic antero-apical segment. TR was detected in 22 (88%) pts being trivial in 16 (64%), mild in 4 (16%) and moderate in 2 (8%). It was always possible to visualise the neo left and right atria as well as the caval-right atrial junctions. No systemic or pulmonary venous obstruction was detected. In 3 pts there was a mild subpulmonic dynamic stenosis related with septal buldging and mitral valve apposition. In conclusion, Döppler-echocardiography can provide accurate information for the follow-up of patients with TGV submitted to physiological correction and it can reduce the number and frequency of late postoperative cardiac catheterization.
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Nascimento R, Fernandes R, Cunha A. [Fursemid as an adjuvant in the therapy of pregnancy toxemia]. Hospital (Rio J) 1967; 71:137-40. [PMID: 5302858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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