1
|
Altmayer S, Armelin LM, Pereira JS, Carvalho LV, Tse J, Balthazar P, Francisco MZ, Watte G, Hochhegger B. MRI with DWI improves detection of liver metastasis and selection of surgical candidates with pancreatic cancer: a systematic review and meta-analysis. Eur Radiol 2024; 34:106-114. [PMID: 37566274 DOI: 10.1007/s00330-023-10069-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 02/01/2023] [Revised: 07/07/2023] [Accepted: 07/12/2023] [Indexed: 08/12/2023]
Abstract
OBJECTIVE To perform a systematic review and meta-analysis to evaluate if magnetic resonance imaging (MRI) with diffusion weighted imaging (DWI) adds value compared to contrast-enhanced computed tomography (CECT) alone in the preoperative evaluation of pancreatic cancer. METHODS MEDLINE, EMBASE, and Cochrane databases were searched for relevant published studies through October 2022. Studies met eligibility criteria if they evaluated the per-patient diagnostic performance of MRI with DWI in the preoperative evaluation of newly diagnosed pancreatic cancer compared to CECT. Our primary outcome was the number needed to treat (NNT) to prevent one futile surgery using MRI with DWI, defined as those in which CECT was negative and MRI with DWI was positive for liver metastasis (i.e., surgical intervention in metastatic disease missed by CECT). The secondary outcomes were to determine the diagnostic performance and the NNT of MRI with DWI to change management in pancreatic cancer. RESULTS Nine studies met the inclusion criteria with a total of 1121 patients, of whom 172 had liver metastasis (15.3%). The proportion of futile surgeries reduced by MRI with DWI was 6.0% (95% CI, 3.0-11.6%), yielding an NNT of 16.6. The proportion of cases that MRI with DWI changed management was 18.1% (95% CI, 9.9-30.7), corresponding to an NNT of 5.5. The per-patient sensitivity and specificity of MRI were 92.4% (95% CI, 87.4-95.6%) and 97.3% (95% CI, 96.0-98.1). CONCLUSION MRI with DWI may prevent futile surgeries in pancreatic cancer by improving the detection of occult liver metastasis on preoperative CECT with an NNT of 16.6. CLINICAL RELEVANCE STATEMENT MRI with DWI complements the standard preoperative CECT evaluation for liver metastasis in pancreatic cancer, improving the selection of surgical candidates and preventing unnecessary surgeries. KEY POINTS • The NNT of MRI with DWI to prevent potential futile surgeries due to occult liver metastasis on CECT, defined as those in which CECT was negative and MRI with DWI was positive for liver metastasis, in patients with pancreatic cancer was 16.6. • The higher performance of MRI with DWI to detect liver metastasis occult on CECT can be attributed to an increased detection of subcentimeter liver metastasis.
Collapse
Affiliation(s)
- Stephan Altmayer
- Department of Radiology, Stanford University, 300 Pasteur Drive, Suite H1330, Stanford, USA.
| | - Larissa Maria Armelin
- Faculdade de Medicina, Universidade Federal de Minas Gerais, 190 Prof Alfredo Balena Ave, Belo Horizonte, Brazil
| | | | - Lis Vitoria Carvalho
- Faculdade de Medicina, Universidade de São Paulo, 455 Dr Arnaldo Ave, São Paulo, Brazil
| | - Justin Tse
- Department of Radiology, Stanford University, 300 Pasteur Drive, Suite H1330, Stanford, USA
| | | | - Martina Zaguini Francisco
- Department of Radiology, Universidade Federal de Ciencias da Saude de Porto Alegre, 245 Sarmento Leite St, Porto Alegre, Brazil
| | - Guilherme Watte
- Department of Radiology, Universidade Federal de Ciencias da Saude de Porto Alegre, 245 Sarmento Leite St, Porto Alegre, Brazil
| | - Bruno Hochhegger
- Department of Radiology, University of Florida, 1600 SW Archer Rd, Gainesville, USA
| |
Collapse
|
2
|
Serejo JAS, Pereira JS, Mouta R, Rego LGC. Sluggish anion transport provides good kinetic stability to the anhydrous anti-perovskite solid electrolyte Li 3OCl. Phys Chem Chem Phys 2021; 23:6964-6973. [PMID: 33730138 DOI: 10.1039/d1cp00593f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Some lithium oxyhalides have been proposed as low-cost solid electrolytes for having room-temperature Li+ conductivity close to commercial liquid electrolytes, but with the advantages of enabling higher energy densities through the use of the Li metal anode and not being flammable. However, the stability of anhydrous anti-perovskite lithium oxyhalides, such as Li3OCl, is not well understood yet: whereas theoretical calculations show they should decompose into lithium halides and Li2O (except at high temperatures), there is no experimental evidence of such decomposition. Thus, here we use a combination of analytical calculations and force-field-based atomistic modelling to investigate the role of kinetics in the stability of anhydrous Li3OCl. The results show that due to sluggish Cl- and O2- transport this material has good kinetic stability below ∼400 K under high concentration gradients, below ∼450 K under typical cell voltages, and at all temperatures against local composition fluctuations. Furthermore, the good kinetic stability explains the apparent discrepancy between theoretical thermodynamics calculations and experimental observations and contributes to enlighten the nature and extent of this material's stability. The methods presented here can also be extended to other battery materials that are predicted to decompose, to access the safe temperature range they can undergo without degrading.
Collapse
Affiliation(s)
- J A S Serejo
- Programa de Pós-Graduação em Física, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | | | | | | |
Collapse
|
3
|
Alves JG, Sarmento S, Pereira JS, Pereira MF, Sousa MJ, Cunha L, Dias A, Oliveira AD, Cardoso JV, Santos LM, Lencart J, Gouvêa M, Santos JAM. Dose to the interventional radiologist in CTF-guided procedures. Radiat Environ Biophys 2019; 58:373-384. [PMID: 30993431 DOI: 10.1007/s00411-019-00792-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 04/06/2019] [Indexed: 06/09/2023]
Abstract
The aim of this work was to assess the occupational dose received by an interventional radiologist (IR) during computed tomography fluoroscopy (CTF)-guided procedures; to identify the most exposed areas of the body including the hands and fingers; to suggest recommendations for individual monitoring; and to improve radiation safety of the practice. A total of 53 CTF-guided procedures were studied. Twelve whole-body dosimeters were worn by the IR in each procedure for the assessment of the personal dose equivalent, Hp(10), on the chest, waist, and back, both over and under the lead apron, as well as the personal dose equivalent, Hp(0.07), on both arms, knees, and feet. Special gloves with casings to fit extremity dosimeters were prepared to assess Hp(0.07) to the fingers. The measured chest dose values were higher than those on the waist and back; the dominant hand or the left side was the most exposed. In general, the ring, middle, and index fingers of the dominant hand were the most exposed (maximum in the 36-39 mSv range), while wrist dose was negligible compared to finger doses. Based on the results obtained the following recommendations are suggested: protective devices (lead aprons, thyroid shield, and goggles) should be worn; Hp(10) should be assessed at the chest level both above and below the lead apron; finger doses can be measured on the basis of each middle finger; the arm closer to the beam should be monitored; and finally, a wrist dosimeter will not provide useful information.
Collapse
Affiliation(s)
- J G Alves
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal.
- Departamento de Engenharia e Ciências Nucleares (DECN), Centro de Ciências e Tecnologias Nucleares (C2TN), UL-IST, Bobadela LRS, Portugal.
| | - S Sarmento
- Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOPFG E.P.E.), Serviço de Física Médica, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
- Centro de Investigação, IPOPFG E.P.E., Porto, Portugal
| | - J S Pereira
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal
- Departamento de Engenharia e Ciências Nucleares (DECN), Centro de Ciências e Tecnologias Nucleares (C2TN), UL-IST, Bobadela LRS, Portugal
| | - M F Pereira
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal
- Departamento de Engenharia e Ciências Nucleares (DECN), Centro de Ciências e Tecnologias Nucleares (C2TN), UL-IST, Bobadela LRS, Portugal
| | - M J Sousa
- Serviço de Radiologia de Intervenção, IPOPFG E.P.E., Porto, Portugal
| | - L Cunha
- Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOPFG E.P.E.), Serviço de Física Médica, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
- Centro de Investigação, IPOPFG E.P.E., Porto, Portugal
| | - A Dias
- Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOPFG E.P.E.), Serviço de Física Médica, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
- Centro de Investigação, IPOPFG E.P.E., Porto, Portugal
| | - A D Oliveira
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal
- Departamento de Engenharia e Ciências Nucleares (DECN), Centro de Ciências e Tecnologias Nucleares (C2TN), UL-IST, Bobadela LRS, Portugal
| | - J V Cardoso
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal
| | - L M Santos
- Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2695-066, Bobadela LRS, Portugal
| | - J Lencart
- Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOPFG E.P.E.), Serviço de Física Médica, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
| | - M Gouvêa
- Serviço de Radiologia, IPOPFG E.P.E., Porto, Portugal
| | - J A M Santos
- Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOPFG E.P.E.), Serviço de Física Médica, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
- Centro de Investigação, IPOPFG E.P.E., Porto, Portugal
| |
Collapse
|
4
|
Pereira JS, Pereira MF, Rangel S, Caldeira M, Carvalhal G, Santos LM, Cardoso JV, Alves JG. TYPE TESTING OF LiF:Mg,Cu,P (TLD-100H) WHOLE-BODY DOSEMETERS FOR THE ASSESSMENT OF Hp(10) AND Hp(0.07). Radiat Prot Dosimetry 2019; 184:216-223. [PMID: 30496554 DOI: 10.1093/rpd/ncy202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/25/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
In this work, the initial results of the type testing of the LiF:Mg,Cu,P (TLD-100H) whole-body personal dosemeters are presented. An assessment of reproducibility, linearity of the response, the residual signal as a function of the dose, energy and angular dependence of the response was performed. In general, the dosemeters show good reproducibility for different dose values and a linear behaviour for a range between 0.1 and 300 mSv. The detection limits obtained are lower than 50 μSv. The system presents a good energy and angular response for different radiation qualities.
Collapse
Affiliation(s)
- J S Pereira
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
- UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - M F Pereira
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
- UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - S Rangel
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - M Caldeira
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
- UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - G Carvalhal
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - L M Santos
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - J V Cardoso
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| | - J G Alves
- Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
- UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, Portugal
| |
Collapse
|
5
|
Carvalho MJS, Oliveira EJ, Souza AS, Pereira JS, Diamantino MSAS, Oliveira SAS. Cleaning cassava genotypes infected with cassava frogskin disease via in vitro shoot tip culture. Genet Mol Res 2017; 16:gmr-16-02-gmr.16029556. [PMID: 28613372 DOI: 10.4238/gmr16029556] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study aimed to develop a methodology for eliminating cassava frogskin disease (CFSD) from in vitro shoot tip culture by associating thermotherapy and tetracycline. Cuttings from different accessions (BGM0232, BGM0315, BGM0464, BGM584, BGM0841, and BGM1342), infected with CFSD according to visual inspection of the disease symptoms, were used for cleaning. To verify the absence of other diseases, the plants were indexed for Cassava common mosaic virus - CsCMV (by ELISA) and Cassava vein mosaic virus - CsVMV (by polymerase chain reaction, PCR), proving that the accessions were free of these viruses, except for BGM0315 and BGM0464, which were infected with CsVMV. Subsequently, the cuttings were submitted to different tetracycline concentrations for 3 min, and then subjected to thermotherapy under different temperatures (35°, 38°, 40°, 45°, and 55°C). Shoots of 2 cm were harvested, and their surfaces were sterilized in a laminar flow chamber. Subsequently, the shoot tips of different sizes were removed (0.2, 0.4, 0.5, and 1.0 mm) for inoculation in a culture medium with tetracycline at the same concentrations in which the cuttings were dipped. After 60 days of cultivation, the explants were transferred to a multiplication medium without antibiotics. Thirty days after the transfer, the viability of the regenerated plants was evaluated, which were then acclimatized for 70 days in a greenhouse and transferred to the field. After 7 months, a visual analysis of the symptomatic roots and a PCR analysis were held to prove the elimination of CFSD and CsVMV from the accessions infected with these viruses (BGM0315 and BGM0464), respectively. Most of the treatments resulted in 100% cleaning of CFSD-infected plants. From accessions that were also infected with CsVMV, only 2% of the plants remained infected, also demonstrating the cleaning efficiency of this protocol for this disease.
Collapse
Affiliation(s)
- M J S Carvalho
- Núcleo de Recursos Genéticos e Desenvolvimento de Variedades, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil
| | - E J Oliveira
- Núcleo de Recursos Genéticos e Desenvolvimento de Variedades, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil .,Centro de Ciências Agrárias Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, BA, Brasil
| | - A S Souza
- Núcleo de Recursos Genéticos e Desenvolvimento de Variedades, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil
| | - J S Pereira
- Centro de Ciências Agrárias Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, BA, Brasil
| | - M S A S Diamantino
- Núcleo de Recursos Genéticos e Desenvolvimento de Variedades, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil
| | - S A S Oliveira
- Núcleo de Recursos Genéticos e Desenvolvimento de Variedades, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil
| |
Collapse
|
6
|
Chaves MM, Costa JM, Zarrouk O, Pinheiro C, Lopes CM, Pereira JS. Controlling stomatal aperture in semi-arid regions-The dilemma of saving water or being cool? Plant Sci 2016; 251:54-64. [PMID: 27593463 DOI: 10.1016/j.plantsci.2016.06.015] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 06/14/2016] [Accepted: 06/22/2016] [Indexed: 05/24/2023]
Abstract
Stomatal regulation of leaf gas exchange with the atmosphere is a key process in plant adaptation to the environment, particularly in semi-arid regions with high atmospheric evaporative demand. Development of stomata, integrating internal signaling and environmental cues sets the limit for maximum diffusive capacity of stomata, through size and density and is under a complex genetic control, thus providing multiple levels of regulation. Operational stomatal conductance to water vapor and CO2 results from feed-back and/or feed-forward mechanisms and is the end-result of a plethora of signals originated in leaves and/or in roots at each moment. CO2 assimilation versus water vapor loss, proposed to be the subject of optimal regulation, is species dependent and defines the water use efficiency (WUE). WUE has been a topic of intense research involving areas from genetics to physiology. In crop plants, especially in semi-arid regions, the question that arises is how the compromise of reducing transpiration to save water will impact on plant performance through leaf temperature. Indeed, plant transpiration by providing evaporative cooling, is a major component of the leaf energy balance. In this paper we discuss the dilemma of 'saving water or being cool' bringing about recent findings from molecular genetics, to development and physiology of stomata. The question of 'how relevant is screening for high/low WUE in crops for semi-arid regions, where drought and heat co-occur' is discussed.
Collapse
Affiliation(s)
- M M Chaves
- Plant Molecular Physiology Laboratory, ITQBNOVA, Universidade Nova de Lisboa, Oeiras, Portugal.
| | - J M Costa
- Plant Molecular Physiology Laboratory, ITQBNOVA, Universidade Nova de Lisboa, Oeiras, Portugal; LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa, Portugal
| | - O Zarrouk
- Plant Molecular Physiology Laboratory, ITQBNOVA, Universidade Nova de Lisboa, Oeiras, Portugal
| | - C Pinheiro
- Plant Molecular Physiology Laboratory, ITQBNOVA, Universidade Nova de Lisboa, Oeiras, Portugal; Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829-516, Portugal
| | - C M Lopes
- LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa, Portugal
| | - J S Pereira
- LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa, Portugal
| |
Collapse
|
7
|
Agostinho LA, Spitz M, Pereira JS, Paiva CLA. Clinical and genetic investigation of a Brazilian family with Huntington's disease. Funct Neurol 2016; 31:135-42. [PMID: 27678206 DOI: 10.11138/fneur/2016.31.3.135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this study was to investigate a Brazilian family carrying full penetrance alleles for Huntington's disease (HD) in order to correlate each member's genetic and clinical features. To this end, the following scales were administered in each patient: the Beck Depression Inventory, the Mini-Mental State Examination (MMSE) and the Unified Huntington's Disease Rating Scale (UHDRS). The patterns of CAG and CCG polymorphic regions in the HTT gene were determined, the disease burden score was calculated, and genotypes were correlated with phenotypes within this family. We suggest that HD duration, the number of years of formal education, and UHDRS status variables can explain 96.6% of the MMSE variability in HD patients. A strong significant correlation was found between the disease burden score and the UHDRS (r = 0.76; p-value = 0.049) and the MMSE (r = -0.90; p-value = 0.006). The correlations between CAG allele size and the three clinical evaluations performed in the HD patients were not statistically significant.
Collapse
|
8
|
Kocdor MA, Kocdor H, Pereira JS, Vanegas JE, Russo IH, Russo J. Progressive increase of glucose transporter-3 (GLUT-3) expression in estrogen-induced breast carcinogenesis. Clin Transl Oncol 2012; 15:55-64. [PMID: 23054751 DOI: 10.1007/s12094-012-0882-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2011] [Accepted: 03/19/2012] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Increased glucose uptake and glycolysis are main metabolic characteristics of malignant cells. A family of glucose transporters (GLUTs) facilitates glucose movement across the plasma membranes in a tumor-specific manner. Glucose transporter-1 (GLUT-1), GLUT-3 and recently GLUT-12, have been previously shown in breast cancer cells and are found to be associated with poor prognosis. In addition, it has been shown that estrogen plays critical roles in GLUT regulation, however, the stage-specific GLUT regulation of mammary carcinogenesis is unclear. METHODS GLUT expression patterns were investigated in an in vitro-in vivo progressive, estrogen-induced, mammary carcinogenesis model which consisted of four cell lines, with same genetic background. In this model, different stages of tumor initiation and progression are represented, MCF-10F being the normal stage, E2 cells the transformed stage by estrogen, C5 cells, the invasive stage, and T4 cells the tumorigenic stage. In addition, loss of ductulogenesis and solid mass formation in collagen matrix and invasiveness of the cells were counted. RESULTS Real time PCR showed that GLUT1 expression was downregulated in MCF10F after treatment with 17β-estradiol (E2), and in the invasive cell type (C5), but not in the tumor cells (T4), which had no changes compared to MCF10F. C5 and T4 cells showed the highest rate of GLUT-3 expression. These cells were also found to be associated with loss of ductulogenesis, solid mass formation and higher invasive capacity, whereas, GLUT-12 was downregulated in C5 and T4 cells. CONCLUSION Estrogen-induced malignant transformation is associated with remarkable and progressive GLUT-3 expression, GLUT-1 re-expression at further stages, as well as GLUT-12 downregulation.
Collapse
Affiliation(s)
- M A Kocdor
- Department of Surgery, School of Medicine, Dokuz Eylul University, Inciralti, Izmir, Turkey.
| | | | | | | | | | | |
Collapse
|
9
|
Nunes SF, Figueiredo IV, Pereira JS, Lopes MC, Caramona MM. Correlation between total nitrite/nitrate concentrations and monoamine oxidase (types A and B) and semicarbazide-sensitive amine oxidase enzymatic activities in human mesenteric arteries from non-diabetic and type 2 diabetic patients. Braz J Med Biol Res 2011; 45:20-4. [PMID: 22124705 PMCID: PMC3854142 DOI: 10.1590/s0100-879x2011007500156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 11/04/2011] [Indexed: 11/23/2022] Open
Abstract
The aim of this study was to determine the correlation between total nitrite/nitrate concentrations (NOx) and the kinetic parameters of monoamine oxidase enzymes (MAO-A and MAO-B) and semicarbazide-sensitive amine oxidase (SSAO) in human mesenteric arteries. Arteries were from non-diabetic and type 2 diabetic patients with sigmoid or rectum carcinoma for whom surgery was the first option and who were not exposed to neo-adjuvant therapy. Segments of human inferior mesenteric arteries from non-diabetic (61.1 ± 8.9 years old, 7 males and 5 females, N = 12) and type 2 diabetic patients (65.8 ± 6.2 years old, 8 males and 4 females, N = 12) were used to determine NOx concentrations and the kinetic parameters of MAO-A, MAO-B and SSAO by the Griess reaction and by radiochemical assay, respectively. The NOx concentrations in arteries from diabetic patients did not differ significantly from those of the non-diabetic group (10.28 ± 4.61 vs 10.71 ± 4.32 nmol/mg protein, respectively). In the non-diabetic group, there was a positive correlation between NOx concentrations and MAO-B parameters: Km (r = 0.612, P = 0.034) and Vmax (r = 0.593, P = 0.042), and a negative correlation with the SSAO parameters: Km (r = -0.625, P = 0.029) and Vmax (r = -0.754, P = 0.005). However, in the diabetic group no correlation was found between NOx concentrations and the three kinetic parameters of the enzymes. These results suggest an important function of sympathetic nerves and vascular NOx concentrations in arteries of non-diabetic patients. Thus, these results confirm the importance of a balance between oxidants and antioxidants in the maintenance of vascular homeostasis to prevent oxidative stress.
Collapse
Affiliation(s)
- S F Nunes
- Laboratório de Farmacologia, Universidade de Coimbra, Coimbra, Portugal
| | | | | | | | | |
Collapse
|
10
|
Hector A, Hautier Y, Saner P, Wacker L, Bagchi R, Joshi J, Scherer-Lorenzen M, Spehn EM, Bazeley-White E, Weilenmann M, Caldeira MC, Dimitrakopoulos PG, Finn JA, Huss-Danell K, Jumpponen A, Mulder CPH, Palmborg C, Pereira JS, Siamantziouras ASD, Terry AC, Troumbis AY, Schmid B, Loreau M. General stabilizing effects of plant diversity on grassland productivity through population asynchrony and overyielding. Ecology 2010; 91:2213-20. [PMID: 20836442 DOI: 10.1890/09-1162.1] [Citation(s) in RCA: 227] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Insurance effects of biodiversity can stabilize the functioning of multispecies ecosystems against environmental variability when differential species' responses lead to asynchronous population dynamics. When responses are not perfectly positively correlated, declines in some populations are compensated by increases in others, smoothing variability in ecosystem productivity. This variance reduction effect of biodiversity is analogous to the risk-spreading benefits of diverse investment portfolios in financial markets. We use data from the BIODEPTH network of grassland biodiversity experiments to perform a general test for stabilizing effects of plant diversity on the temporal variability of individual species, functional groups, and aggregate communities. We tested three potential mechanisms: reduction of temporal variability through population asynchrony; enhancement of long-term average performance through positive selection effects; and increases in the temporal mean due to overyielding. Our results support a stabilizing effect of diversity on the temporal variability of grassland aboveground annual net primary production through two mechanisms. Two-species communities with greater population asynchrony were more stable in their average production over time due to compensatory fluctuations. Overyielding also stabilized productivity by increasing levels of average biomass production relative to temporal variability. However, there was no evidence for a performance-enhancing effect on the temporal mean through positive selection effects. In combination with previous work, our results suggest that stabilizing effects of diversity on community productivity through population asynchrony and overyielding appear to be general in grassland ecosystems.
Collapse
Affiliation(s)
- A Hector
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Vaz M, Pereira JS, Gazarini LC, David TS, David JS, Rodrigues A, Maroco J, Chaves MM. Drought-induced photosynthetic inhibition and autumn recovery in two Mediterranean oak species (Quercus ilex and Quercus suber). Tree Physiol 2010; 30:946-56. [PMID: 20571151 DOI: 10.1093/treephys/tpq044] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Responses of leaf water relations and photosynthesis to summer drought and autumn rewetting were studied in two evergreen Mediterranean oak species, Quercus ilex spp. rotundifolia and Quercus suber. The predawn leaf water potential (Ψ(lPD)), stomatal conductance (gs) and photosynthetic rate (A) at ambient conditions were measured seasonally over a 3-year period. We also measured the photosynthetic response to light and to intercellular CO₂ (A/PPFD and A/C(i) response curves) under water stress (summer) and after recovery due to autumn rainfall. Photosynthetic parameters, Vc(max), J(max) and triose phosphate utilization (TPU) rate, were estimated using the Farquhar model. RuBisCo activity, leaf chlorophyll, leaf nitrogen concentration and leaf carbohydrate concentration were also measured. All measurements were performed in the spring leaves of the current year. In both species, the predawn leaf water potential, stomatal conductance and photosynthetic rate peaked in spring, progressively declined throughout the summer and recovered upon autumn rainfall. During the drought period, Q. ilex maintained a higher predawn leaf water potential and stomatal conductance than Q. suber. During this period, we found that photosynthesis was not only limited by stomatal closure, but was also downregulated as a consequence of a decrease in the maximum carboxylation rate (Vc(max)) and the light-saturated rate of photosynthetic electron transport (J(max)) in both species. The Vc(max) and J(max) increased after the first autumnal rains and this increase was related to RuBisCo activity, leaf nitrogen concentration and chlorophyll concentration. In addition, an increase in the TPU rate and in soluble leaf sugar concentration was observed in this period. The results obtained indicate a high resilience of the photosynthetic apparatus to summer drought as well as good recovery in the following autumn rains of these evergreen oak species.
Collapse
Affiliation(s)
- M Vaz
- Instituto de Ciências Agrárias e Ambientais Mediterrânicas (ICAAM)/Dep. Biologia, Universidade de Evora, Apartado 94, 7002-554 Evora, Portugal.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Costa E Silva F, Shvaleva A, Broetto F, Ortuño MF, Rodrigues ML, Almeida MH, Chaves MM, Pereira JS. Acclimation to short-term low temperatures in two Eucalyptus globulus clones with contrasting drought resistance. Tree Physiol 2009; 29:77-86. [PMID: 19203934 DOI: 10.1093/treephys/tpn002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We tested the hypothesis that Eucalyptus globulus Labill. genotypes that are more resistant to dry environments might also exhibit higher cold tolerances than drought-sensitive plants. The effect of low temperatures was evaluated in acclimated and unacclimated ramets of a drought-resistant clone (CN5) and a drought-sensitive clone (ST51) of E. globulus. We studied the plants' response via leaf gas exchanges, leaf water and osmotic potentials, concentrations of soluble sugars, several antioxidant enzymes and leaf electrolyte leakage. Progressively lowering air temperatures (from 24/16 to 10/-2 degrees C, day/night) led to acclimation of both clones. Acclimated ramets exhibited higher photosynthetic rates, stomatal conductances and lower membrane relative injuries when compared to unacclimated ramets. Moreover, low temperatures led to significant increases of soluble sugars and antioxidant enzymes activity (glutathione reductase, ascorbate peroxidase and superoxide dismutases) of both clones in comparison to plants grown at control temperature (24/16 degrees C). On the other hand, none of the clones, either acclimated or not, exhibited signs of photoinhibition under low temperatures and moderate light. The main differences in the responses to low temperatures between the two clones resulted mainly from differences in carbon metabolism, including a higher accumulation of soluble sugars in the drought-resistant clone CN5 as well as a higher capacity for osmotic regulation, as compared to the drought-sensitive clone ST51. Although membrane injury data suggested that both clones had the same inherent freezing tolerance before and after cold acclimation, the results also support the hypothesis that the drought-resistant clone had a greater cold tolerance at intermediate levels of acclimation than the drought-sensitive clone. A higher capacity to acclimate in a short period can allow a clone to maintain an undamaged leaf surface area along sudden frost events, increasing growth capacity. Moreover, it can enhance survival chances in frost-prone sites expanding the plantation range with more adaptive clones.
Collapse
Affiliation(s)
- F Costa E Silva
- Instituto Superior de Agronomia, Tapada da Ajuda 1349-017, Lisbon, Portugal.
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Cerasoli S, McGuire MA, Faria J, Mourato M, Schmidt M, Pereira JS, Chaves MM, Teskey RO. CO2 efflux, CO2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.). J Exp Bot 2008; 60:99-105. [PMID: 19036840 DOI: 10.1093/jxb/ern272] [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] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In spite of the importance of respiration in forest carbon budgets, the mechanisms by which physiological factors control stem respiration are unclear. An experiment was set up in a Eucalyptus globulus plantation in central Portugal with monoculture stands of 5-year-old and 10-year-old trees. CO(2) efflux from stems under shaded and unshaded conditions, as well as the concentration of CO(2) dissolved in sap [CO(2)(*)], stem temperature, and sap flow were measured with the objective of improving our understanding of the factors controlling CO(2) release from stems of E. globulus. CO(2) efflux was consistently higher in 5-year-old, compared with 10-year-old, stems, averaging 3.4 versus 1.3 mumol m(-2) s(-1), respectively. Temperature and [CO(2)(*)] both had important, and similar, influences on the rate of CO(2) efflux from the stems, but neither explained the difference in the magnitude of CO(2) efflux between trees of different age and size. No relationship was found between efflux and sap flow, and efflux was independent of tree volume, suggesting the presence of substantial barriers to the diffusion of CO(2) from the xylem to the atmosphere in this species. The rate of corticular photosynthesis was the same in trees of both ages and only reduced CO(2) efflux by 7%, probably due to the low irradiance at the stem surface below the canopy. The younger trees were growing at a much faster rate than the older trees. The difference between CO(2) efflux from the younger and older stems appears to have resulted from a difference in growth respiration rather than a difference in the rate of diffusion of xylem-transported CO(2).
Collapse
Affiliation(s)
- S Cerasoli
- Departamento de Egenharia Floresta, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
| | | | | | | | | | | | | | | |
Collapse
|
14
|
de Carvalho CRN, da Silva IDCG, Pereira JS, de Souza NCN, Focchi GRDA, Ribalta JCL. Polymorphisms of p53, GSTM1 and GSTT1, and HPV in uterine cervix adenocarcinoma. EUR J GYNAECOL ONCOL 2008; 29:590-593. [PMID: 19115684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
OBJECTIVE To analyze the participation of glutathione-S-transferase (GST) M1 and T1 polymorphisms associated or not with protein p53 polymorphism at codon 72 and in the presence of HPV in the carcinogenesis of uterine cervix adenocarcinoma. METHODS Forty-three samples of uterine cervix adenocarcinoma were studied and 86 samples of endocervical cells of women without tumors formed the control group. The presence of HPV was determined in order to genotype the isoforms of p53 at codon 72, GSTM1, GSTM1*0, GSTT1 and GSTT1*0 which were evaluated by the PCR method. RESULTS HPV was present in 97.67% of the adenocarcinoma cases and in 31.40% of the control group. Statistical analysis showed differences (p = 0.001) and an OR of 113.3 (CI 95%: 13.67-947.14). GSTT1 and GSTT1*0 analysis showed a significant difference between the groups (p = 0.001) with an OR of 4.58 (CI 95%: 2.041-10.28) (p < 0.001) for the presence of GSTT1*0. When it was associated with HPV OR was 6.6 (CI 95%: 0.04-0.50). Analyses of p53 and GSTM1 and GSTM1*0 either alone or associated with HPV were not significant. CONCLUSION The presence of GSTT1*0 increased the risk for uterine cervix adenocarcinoma development while the allele GSTT1 had a protective action. The other isoforms did not appear to participate in the carcinogenesis of uterine cervix adenocarcinoma.
Collapse
Affiliation(s)
- C R Nogueira de Carvalho
- Department of Gynecology, Universidade Federal de São Paulo/Escola Paulista de Medicina, Brazil.
| | | | | | | | | | | |
Collapse
|
15
|
Otieno DO, Schmidt MWT, Kurz-Besson C, Lobo Do Vale R, Pereira JS, Tenhunen JD. Regulation of transpirational water loss in Quercus suber trees in a Mediterranean-type ecosystem. Tree Physiol 2007; 27:1179-87. [PMID: 17472943 DOI: 10.1093/treephys/27.8.1179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Sap flux density in branches, leaf transpiration, stomatal conductance and leaf water potentials were measured in 16-year-old Quercus suber L. trees growing in a plantation in southern Portugal to understand how evergreen Mediterranean trees regulate water loss during summer drought. Leaf specific hydraulic conductance and leaf gas exchange were monitored during the progressive summer drought to establish how changes along the hydraulic pathway influence shoot responses. As soil water became limiting, leaf water potential, stomatal conductance and leaf transpiration declined significantly. Predawn leaf water potential reflected soil water potential measured at 1-m depth in the rhizospheres of most trees. The lowest predawn leaf water potential recorded during this period was -1.8 MPa. Mean maximum stomatal conductance declined from 300 to 50 mmol m(-2) s(-1), reducing transpiration from 6 to 2 mmol m(-2) s(-1). Changes in leaf gas exchange were attributed to reduced soil water availability, increased resistances along the hydraulic pathway and, hence, reduced leaf water supply. There was a strong coupling between changes in soil water content and stomatal conductance as well as between stomatal conductance and leaf specific hydraulic conductance. Despite significant seasonal differences among trees in predawn leaf water potential, stomatal conductance, leaf transpiration and leaf specific hydraulic conductance, there were no differences in midday leaf water potentials. The strong regulation of changes in leaf water potential in Q. suber both diurnally and seasonally is achieved through stomatal closure, which is sensitive to changes in both liquid and vapor phase conductance. This sensitivity allows for optimization of carbon and water resource use without compromising the root-shoot hydraulic link.
Collapse
Affiliation(s)
- D O Otieno
- Department of Botany, Maseno University, P.O. Box 333, Maseno, Kenya.
| | | | | | | | | | | |
Collapse
|
16
|
David TS, Henriques MO, Kurz-Besson C, Nunes J, Valente F, Vaz M, Pereira JS, Siegwolf R, Chaves MM, Gazarini LC, David JS. Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought. Tree Physiol 2007; 27:793-803. [PMID: 17331898 DOI: 10.1093/treephys/27.6.793] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
In the Mediterranean evergreen oak woodlands of southern Portugal, the main tree species are Quercus ilex ssp. rotundifolia Lam. (holm oak) and Quercus suber L. (cork oak). We studied a savannah-type woodland where these species coexist, with the aim of better understanding the mechanisms of tree adaptation to seasonal drought. In both species, seasonal variations in transpiration and predawn leaf water potential showed a maximum in spring followed by a decline through the rainless summer and a recovery with autumn rainfall. Although the observed decrease in predawn leaf water potential in summer indicates soil water depletion, trees maintained transpiration rates above 0.7 mm day(-1) during the summer drought. By that time, more than 70% of the transpired water was being taken from groundwater sources. The daily fluctuations in soil water content suggest that some root uptake of groundwater was mediated through the upper soil layers by hydraulic lift. During the dry season, Q. ilex maintained higher predawn leaf water potentials, canopy conductances and transpiration rates than Q. suber. The higher water status of Q. ilex was likely associated with their deeper root systems compared with Q. suber. Whole-tree hydraulic conductance and minimum midday leaf water potential were lower in Q. ilex, indicating that Q. ilex was more tolerant to drought than Q. suber. Overall, Q. ilex seemed to have more effective drought avoidance and drought tolerance mechanisms than Q. suber.
Collapse
Affiliation(s)
- T S David
- Estação Florestal Nacional (INIAP), Quinta do Marquês, 2780-159 Oeiras, Portugal.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Shvaleva AL, Costa E Silva F, Breia E, Jouve J, Hausman JF, Almeida MH, Maroco JP, Rodrigues ML, Pereira JS, Chaves MM. Metabolic responses to water deficit in two Eucalyptus globulus clones with contrasting drought sensitivity. Tree Physiol 2006; 26:239-48. [PMID: 16356921 DOI: 10.1093/treephys/26.2.239] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We compared the metabolic responses of leaves and roots of two Eucalyptus globulus Labill. clones differing in drought sensitivity to a slowly imposed water deficit. Responses measured included changes in concentrations of soluble and insoluble sugars, proline, total protein and several antioxidant enzymes. In addition to the general decrease in growth caused by water deficit, we observed a decrease in osmotic potential when drought stress became severe. In both clones, the decrease was greater in roots than in leaves, consistent with the observed increases in concentrations of soluble sugars and proline in these organs. In roots of both clones, glutathione reductase activity increased significantly in response to water deficit, suggesting that this enzyme plays a protective role in roots during drought stress by catalyzing the catabolism of reactive oxygen species. Clone CN5 has stress avoidance mechanisms that account for its lower sensitivity to drought compared with Clone ST51.
Collapse
Affiliation(s)
- A L Shvaleva
- Instituto Superior de Agronomia, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Costa E Silva F, Shvaleva A, Maroco JP, Almeida MH, Chaves MM, Pereira JS. Responses to water stress in two Eucalyptus globulus clones differing in drought tolerance. Tree Physiol 2004; 24:1165-72. [PMID: 15294763 DOI: 10.1093/treephys/24.10.1165] [Citation(s) in RCA: 19] [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: 05/10/2023]
Abstract
We evaluated drought resistance mechanisms in a drought-tolerant clone (CN5) and a drought-sensitive clone (ST51) of Eucalyptus globulus Labill. based on the responses to drought of some physiological, biophysical and morphological characteristics of container-grown plants, with particular emphasis on root growth and hydraulic properties. Water loss in excess of that supplied to the containers led to a general decrease in growth and significant reductions in leaf area ratio, specific leaf area and leaf-to-root area ratio. Root hydraulic conductance and leaf-specific hydraulic conductance decreased as water stress became more severe. During the experiment, the drought-resistant CN5 clone maintained higher leaf water status (higher predawn and midday leaf water potentials), sustained a higher growth rate (new leaf area expansion and root growth) and displayed greater carbon allocation to the root system and lower leaf-to-root area ratio than the drought-sensitive ST51 clone. Clone CN5 possessed higher stomatal conductances at moderate stress as well as higher hydraulic conductances than Clone ST51. Differences in the response to drought in root biomass, coupled with changes in hydraulic properties, accounted for the clonal differences in drought tolerance, allowing Clone CN5 to balance transpiration and water absorption during drought treatment and thereby prolong the period of active carbon assimilation.
Collapse
Affiliation(s)
- F Costa E Silva
- Instituto Superior de Agronomia, Departamento de Engenharia Florestal, Tapada da Ajuda 1349-017 Lisbon, Portugal.
| | | | | | | | | | | |
Collapse
|
19
|
Brenna SMF, Silva IDCG, Zeferino LC, Pereira JS, Martinez EZ, Syrjänen KJ. Prognostic value of P53 codon 72 polymorphism in invasive cervical cancer in Brazil. Gynecol Oncol 2004; 93:374-80. [PMID: 15099948 DOI: 10.1016/j.ygyno.2004.03.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2003] [Indexed: 10/26/2022]
Abstract
OBJECTIVE The prognostic value of p53 codon72 polymorphism was analyzed in Brazilian women with cervical cancer. METHODS The present study consists of 148 women diagnosed and treated for invasive cervical carcinoma (FIGO stages Ib-IIIb) between 1992 and 2002. Demonstration of p53 polymorphism was performed in DNA extracted from paraffin-embedded sections using the polymerase chain reaction (PCR). RESULTS Among the 148 women, arg/arg was found in 99 (67%) and, arg/pro in 49 (33%). The overall survival (OS) curves (univariate) were different between arg/arg and arg/pro patients (P = 0.01). There was slightly increased risk of death for arg/arg patients (crude HR 2.2 CI 95% 1.2-4.0), which was not confounded by FIGO stages (adjusted HR 2.4 CI 95% 1.3-4.3). For disease-free survival (DFS), two situations were considered: (1) 124 women who received any treatment, and (2) 118 who received FIGO-recommended treatment. In the first group, 59% of arg/arg patients presented recurrence as compared to 32% in the arg/pro group (P = 0.02), whereas in the second group, 61% of the arg/arg and 34% arg/pro showed recurrence (P = 0.04). The risk of recurrence adjusted by FIGO stage for the 124 patients was 2.4 (CI 95% 1.0-3.7) and for the 118 it was 1.9 (CI 95% 1.0-3.4). These adjusted models showed no confounding and no interaction. CONCLUSIONS Despite the prognostic significance of p53 polymorphism in univariate survival analysis, there was no or only marginal evidence on the independent prognostic value of p53arg/arg in multivariate analysis. The more ominous prognosis of the homozygous (arg/arg) patients was explained by the primary treatment, independent on the FIGO stage.
Collapse
Affiliation(s)
- S M F Brenna
- Gynecology-Oncology, Health State Department, Maternity Hospital Leonor Mendes de Barros, São Paulo, Brazil.
| | | | | | | | | | | |
Collapse
|
20
|
Cerasoli S, Scartazza A, Brugnoli E, Chaves MM, Pereira JS. Effects of partial defoliation on carbon and nitrogen partitioning and photosynthetic carbon uptake by two-year-old cork oak (Quercus suber) saplings. Tree Physiol 2004; 24:83-90. [PMID: 14652217 DOI: 10.1093/treephys/24.1.83] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
At the end of the growing season in late July, 20-month-old cork oak (Quercus suber L.) saplings were partially defoliated (63% of leaf area) to evaluate their ability to recover leaf area after defoliation. At 18 and 127 days after defoliation, changes in starch and nitrogen pools were determined in leaves and perennial organs, and variations in photosynthetic carbon uptake were investigated. To determine the role of stored nitrogen in regrowth after defoliation, plant nitrogen was labeled in the previous winter by enriching the nutrient solution with 15N. Plants recovered the lost leaf area in 127 days. Although there was remobilization of starch and nitrogen from leaves and perennial organs, the availability of resources for growth in the following spring was not decreased by defoliation. On the contrary, starch concentration in coarse roots was higher in defoliated saplings than in control saplings, presumably as a result of the higher net CO2 exchange rate in newly developed leaves compared with pre-existing leaves.
Collapse
Affiliation(s)
- S Cerasoli
- Instituto de Tecnologia Química e Biológica, Aptd. 12, 2781-901 Oeiras, Portugal.
| | | | | | | | | |
Collapse
|
21
|
Chaves MM, Pereira JS, Maroco J, Rodrigues ML, Ricardo CPP, Osório ML, Carvalho I, Faria T, Pinheiro C. How plants cope with water stress in the field. Photosynthesis and growth. Ann Bot 2002; 89 Spec No:907-16. [PMID: 12102516 PMCID: PMC4233809 DOI: 10.1093/aob/mcf105] [Citation(s) in RCA: 563] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Plants are often subjected to periods of soil and atmospheric water deficit during their life cycle. The frequency of such phenomena is likely to increase in the future even outside today's arid/semi-arid regions. Plant responses to water scarcity are complex, involving deleterious and/or adaptive changes, and under field conditions these responses can be synergistically or antagonistically modified by the superimposition of other stresses. This complexity is illustrated using examples of woody and herbaceous species mostly from Mediterranean-type ecosystems, with strategies ranging from drought-avoidance, as in winter/spring annuals or in deep-rooted perennials, to the stress resistance of sclerophylls. Differences among species that can be traced to different capacities for water acquisition, rather than to differences in metabolism at a given water status, are described. Changes in the root : shoot ratio or the temporary accumulation of reserves in the stem are accompanied by alterations in nitrogen and carbon metabolism, the fine regulation of which is still largely unknown. At the leaf level, the dissipation of excitation energy through processes other than photosynthetic C-metabolism is an important defence mechanism under conditions of water stress and is accompanied by down-regulation of photochemistry and, in the longer term, of carbon metabolism.
Collapse
Affiliation(s)
- M M Chaves
- Instituto Superior de Agronomia, Universidade Técnica Lisboa, Tapada da Ajuda, Portugal.
| | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Rousseau MC, Pereira JS, Prado JC, Villa LL, Rohan TE, Franco EL. Cervical coinfection with human papillomavirus (HPV) types as a predictor of acquisition and persistence of HPV infection. J Infect Dis 2001; 184:1508-17. [PMID: 11740725 DOI: 10.1086/324579] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2001] [Revised: 08/21/2001] [Indexed: 11/03/2022] Open
Abstract
Interest in coinfection with multiple types of human papillomavirus (HPV) has increased in response to the possibility of vaccination and the discovery that the host immune response appears to be mainly type specific. This study attempts to document the occurrence of coinfection with multiple HPV types and to determine whether these coinfections predicted acquisition or persistence of other HPV types in a prospective cohort of women in Brazil. Multiple HPV types were detected at the same visit in one-fifth of all women who tested positive for HPV at any time. Acquisition of an HPV infection was more likely among women with any HPV type detected on study entry. Persistence of HPV infection, the true precursor of cervical abnormalities, was independent of coinfection with other HPV types. Given the increasing prominence of HPV vaccination as a potential preventive approach, it is imperative that additional insights on cross-type protection be obtained from longer-term longitudinal investigations.
Collapse
Affiliation(s)
- M C Rousseau
- Department of Oncology, McGill University, Montreal, Canada.
| | | | | | | | | | | |
Collapse
|
23
|
Abstract
The kinetics of nucleotide turnover vary considerably among isoforms of vertebrate type II myosin, possibly due to differences in the rate of ADP release from the nucleotide binding pocket. Current ideas about likely mechanisms by which ADP release is regulated have focused on the hyperflexible surface loops of myosin, i.e. loop 1 (ATPase loop) and loop 2 (actin binding loop). In the present study, we investigated the kinetic properties of rat and pig beta-myosin heavy chains (beta-MHC) in which we have found the sequences of loop 1 (residues 204-216) to be virtually identical, i.e. DQSKKDSQTPKG, with a single conservative substitution (rat E210D pig). Pig myocardium normally expresses 100% beta-MHC, whereas rat myocardium was induced to express 100% beta-MHC by surgical thyroidectomy and subsequent treatment with propylthiouracil. Slack test measurements at 15 degrees C yielded unloaded shortening velocities of 1.1 +/- 0.8 muscle lengths/s in rat skinned ventricular myocytes and 0.35 +/- 0.05 muscle lengths/s in pig skinned myocytes. Similarly, solution measurements at the same temperature showed that actin-activated ATPase activity was 2.9-fold greater for rat beta-myosin than for pig beta-myosin. Stopped-flow methods were then used to assess the rates of acto-myosin dissociation by MgATP both in the presence and absence of MgADP. Although the rates of MgATP-induced dissociation of acto-heavy meromyosin (acto-HMM) were virtually identical for the two myosins, the rate of ADP dissociation was approximately 3.8-fold faster for rat beta-myosin (135 s(-)(1)) than for pig beta-myosin (35 s(-)(1)). ATP cleavage rates were nearly 30% faster for rat beta-myosin. Thus, whereas loop 1 appears from other studies to be involved in nucleotide turnover in the pocket, our results show that loop 1 does not account for large differences in turnover kinetics in these two myosin isoforms. Instead, the differences appear to be due to sequence differences in other parts of the MHC backbone.
Collapse
Affiliation(s)
- J S Pereira
- Department of Physiology, University of Wisconsin Medical School, Madison, Wisconsin 53706, USA
| | | | | | | | | | | |
Collapse
|
24
|
Hector A, Schmid B, Beierkuhnlein C, Caldeira MC, Diemer M, Dimitrakopoulos PG, Finn JA, Freitas H, Giller PS, Good J, Harris R, Hogberg P, Huss-Danell K, Joshi J, Jumpponen A, Korner C, Leadley PW, Loreau M, Minns A, Mulder CP, O'Donovan G, Otway SJ, Pereira JS, Prinz A, Read DJ, Scherer-Lorenzen M, Schulze ED, Siamantziouras ASD, Spehn EM, Terry AC, Troumbis AY, Woodward FI, Yachi S, Lawton JH. Plant diversity and productivity experiments in european grasslands. Science 1999; 286:1123-7. [PMID: 10550043 DOI: 10.1126/science.286.5442.1123] [Citation(s) in RCA: 801] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
At eight European field sites, the impact of loss of plant diversity on primary productivity was simulated by synthesizing grassland communities with different numbers of plant species. Results differed in detail at each location, but there was an overall log-linear reduction of average aboveground biomass with loss of species. For a given number of species, communities with fewer functional groups were less productive. These diversity effects occurred along with differences associated with species composition and geographic location. Niche complementarity and positive species interactions appear to play a role in generating diversity-productivity relationships within sites in addition to sampling from the species pool.
Collapse
Affiliation(s)
- A Hector
- Natural Environmental Research Council (NERC) Centre for Population Biology, Imperial College at Silwood Park, Ascot, Berkshire, UK, GB-SL5 7PY. Institut fur Umweltwissenschaften, Universitat Zurich, Winterthurerstrasse 190, Zurich, Switzerland
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Affiliation(s)
- D H Nicaretta
- Disciplina de Neurologia, Faculdade de Ciências Médicas, Hospital Universitário Pedro Ernesto, Universidade do Estado do Rio de Janeiro
| | | | | |
Collapse
|
26
|
Abstract
The Fahn, Tolosa e Marín's clinical rating scale for tremor was adapted to our country for evaluation of tremor. This scale was applied to 123 patients with this movement disorder, selected from the Ambulatory of General Medicine at Hospital Universitário Pedro Ernesto da Universidade do Estado do Rio de Janeiro. These patients had been chosen no matter the etiology of their condition or their age. Although some variants may had influenced the scores of this particular scale, they did not seem to change its standardization and applicability.
Collapse
Affiliation(s)
- D H Nicaretta
- Disciplina de Neurologia do Hospital Universitário Pedro Ernesto (HUPE), Rio de Janeiro RJ, Brasil
| | | | | |
Collapse
|
27
|
Abstract
The clinical features of the primary progressive freezing gait, a rare and distinct neurological entity, have been described in some articles. This paper describes this gait disorder affecting one patient, whose condition's long course provoked no postural instability. As stated in the literature, the pathophysiology of the primary progressive freezing gait still remains unclear, although the lack of response to levodopa therapy suggests a possible involvement of nondopaminergic pathways. Alteration in the visual perception may be a potential cause for the condition.
Collapse
|
28
|
Wendler R, Carvalho PO, Pereira JS, Millard P. Role of nitrogen remobilization from old leaves for new leaf growth of Eucalyptus globulus seedlings. Tree Physiol 1995; 15:679-683. [PMID: 14966002 DOI: 10.1093/treephys/15.10.679] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Six-month-old Eucalyptus globulus Labill. seedlings were grown in sand culture irrigated with a nutrient solution containing 6.0 mol N m(-3) for 3 months (November-January). Before rapid growth began in February, seedlings were repotted and irrigated with either 6.0 mol N m(-3) (High-N treatment) or 1.0 mol N m(-3) (Low-N treatment). Seedlings were analyzed during the subsequent flush of growth to determine the role of old leaves, and in particular the leaf protein Rubsico, as a source of N for new leaf growth. During spring growth, the N content of old leaves of High-N seedlings decreased with decreasing leaf dry weight, although there was no change in leaf number. In High-N seedlings, the net loss of N from old leaves provided less than 10% of the N used for new leaf growth, and the new leaves quickly became the dominant sink for N. In contrast, in Low-N seedlings, the net loss of N from old leaves provided 44% of the N used for new leaf growth. During the period of spring growth, the amount of soluble proteins recovered from old leaves of Low-N seedlings dropped, but there was no change in the content of either Rubisco or chlorophyll. The photosynthetic capacity of old leaves remained constant throughout the study period, and there was no evidence that N was remobilized from Rubisco.
Collapse
Affiliation(s)
- R Wendler
- Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB9 2QJ, U.K
| | | | | | | |
Collapse
|
29
|
Abstract
Sixty-two patients with idiopathic Parkinson disease and 30 patients of a control group were clinically evaluated in the light of cognitive and/or psychic impairments according to DSM III-R, mini-mental state examination and Hamilton rating scale for depression. These patients were also submitted to electroencephalogram registration (EEG) with photic stimulation. From the parkinsonian group, 45.2% did not have mental manifestations as classified in the DSM III-R. Other 24.2% had depression, 14.5% had anxiety, 12.9% had dysthymic disorder and 3.2% had dementia. Considering the EEG, 58.1% of the parkinsonian patients had theta waves bilaterally, with predominance in frontal temporal or temporal areas, though more frequent on the left hemisphere than on the right one. Only 16.7% of the patients from the control group had these same findings in the EEG but neither of the two groups had their EEG modified by photic stimulation. The EEG findings were statistically significant when both groups were compared. However, these findings were not significant comparing parkinsonian patients with psychic impairment with the ones who did not have such impairments.
Collapse
Affiliation(s)
- J S Pereira
- Serviço de Neurologia, Hospital Universitário Pedro Ernesto, Rio de Janeiro, Brasil
| | | | | |
Collapse
|
30
|
Pereira JS, Gonçalves V, Varela R, Alves MJ, Corado R. [Pregnancy in women with neural tube fusion defects. Report of 3 cases with different clinical course]. ACTA MEDICA PORT 1995; 8:35-7. [PMID: 7747609] [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: 01/26/2023]
Abstract
The advances in surgical technique for closure of myelomeningocele and its complications, mainly neurogenic bladder, have resulted not only in a increased lifespan and a better quality of life for these patients, but also a progressively higher number of women are reaching childbearing age and becoming pregnant. The reports of pregnancy in these women are still sporadic. In spite of that, obstetricians must be aware of this situation in order to manage it accordingly. In the course of these pregnancies major complications seldom occur. However there are problems (high-risk of neural tube defects in the offsprings, urinary tract complications, muscular-skeletal disorders and psychosociological problems) that should not be ignored and that may influence the prognosis of these pregnancies. The authors present three case reports with different outcomes.
Collapse
Affiliation(s)
- J S Pereira
- Departamento de Obstetrícia, Maternidade Dr. Alfredo da Costa, Lisboa
| | | | | | | | | |
Collapse
|
31
|
Abstract
Primary writing tremor is induced by a specific motor activity, generally the handwriting. The case is analyzed under clinic and therapeutic points of view. The patient had a tremor elicited by handwriting without any other concurrent neurologic alteration. He neither presented familiar antecedents nor metabolic, endocrine, iatrogenic, toxic and traumatic ones. As to the therapeutic approach, the tremor did not respond satisfactorily neither to propranolol nor to primidone. But with anticholinergics improvement of the tremor was verified.
Collapse
Affiliation(s)
- D H Nicaretta
- Hospital Universitário Pedro Ernesto, Universidade do Estado do Rio de Janeiro (HUPE-UERJ), Brasil
| | | | | |
Collapse
|
32
|
Abstract
The authors have studied 53 patients with essential tremor, focusing its clinical and epidemiological aspects. There were familial history in 37.70% of all cases, prevailing in females (56.60%) and white people (69.80%); nevertheless this difference can not be assured from the statistical point of view due to lack of population data. We agreed that the main incidence of this syndrome occurred beyond the 5th decade, specially during the 6th and 7th decades. Topographically, we could observe that the hand tremor predominanted, with an incidence of 96.20% of the total number of cases, followed by head tremor (28.30%), voice tremor (16.99%), leg tremor (11.30%), tongue tremor (3.78%) and trunk tremor (1.88%). These focal tremors were seldom observed alone and we noted frequent association with hand tremor.
Collapse
Affiliation(s)
- J S Pereira
- Serviço de Neurologia, Hospital Universitário Pedro Ernesto, Rio de Janeiro, Brasil
| | | | | |
Collapse
|
33
|
Pereira JS, Chaves MM, Fonseca F, Araújo MC, Torres F. Photosynthetic capacity of leaves of Eucalyptus globulus (Labill.) growing in the field with different nutrient and water supplies. Tree Physiol 1992; 11:381-389. [PMID: 14969943 DOI: 10.1093/treephys/11.4.381] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The effects of water and nutrient availability on photosynthetic capacity of juvenile and adult leaves of Eucalyptus globulus Labill. seedlings were evaluated by measuring oxygen evolution at light and CO(2) saturation. Seedlings supplied with near optimal amounts of water and nutrients had higher growth rates than non-irrigated, unfertilized control seedlings, but photosynthetic capacity was similar in both treatments. Differences in foliar nitrogen concentrations between the two treatments were minor, which largely explains why the growth response to near optimal nutrition was not associated with an increase in photosynthetic capacity per unit leaf area. Nevertheless, the photosynthetic capacity of juvenile leaves decreased from distal to proximal positions in the mid-crown and was positively correlated with leaf nitrogen concentration expressed on a leaf surface area basis. During the dry season, non-irrigated, unfertilized seedlings fixed carbon at lower rates than irrigated seedlings supplied with near optimal nutrition because of stomatal closure even though photosynthetic capacity was unaffected by water deficits. In both treatments, there were differences between the photosynthetic capacity of adult and juvenile leaves that were largely explained by the low specific leaf area of adult leaves.
Collapse
Affiliation(s)
- J S Pereira
- Instituto Superior de Agronomia, Tapada da Ajuda, P-1399 Lisboa codex, Portugal
| | | | | | | | | |
Collapse
|
34
|
Pereira JS, Bertolucci PH, Ferraz HB, De Andrade LA. A study on the action of two calcium channel blockers (verapamil and flunarizine) upon an experimental model of tardive dyskinesia in rats. Arq Neuropsiquiatr 1992; 50:263-8. [PMID: 1308401 DOI: 10.1590/s0004-282x1992000300001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Tardive dyskinesia (TD), a serious complications of neuroleptic chronic use, has no effective therapy yet. We performed an experiment to study the action on TD, of the calcium channel blockers (CCB) drugs, verapamil and flunarizine. We obtained the TD model in rats, administering haloperidol for a 21-day period. After this, the stereotyped movement induced by apomorphine was rated. The CCB drugs were administered in acute (in the 28th day) and chronic (for 8 days, after the 25th day) experiments. Acutely, verapamil increased the stereotyped behaviour, and promoted a reduction of it in the chronic experiment. The results suggest that CCB drugs should be tested in clinical trials of TD.
Collapse
Affiliation(s)
- J S Pereira
- Department of Neurology and Neurosurgery, Escola Paulista de Medicina, Brasli
| | | | | | | |
Collapse
|
35
|
Metcalfe JC, Davies WJ, Pereira JS. Control of growth of juvenile leaves of Eucalyptus globulus: effects of leaf age. Tree Physiol 1991; 9:491-500. [PMID: 14972841 DOI: 10.1093/treephys/9.4.491] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Biophysical variables influencing the expansion of plant cells (yield threshold, cell wall extensibility and turgor) were measured in individual Eucalyptus globulus leaves from the time of emergence until cessation of growth. Leaf water relations variables and growth rates were determined as relative humidity was changed on an hourly basis. Yield threshold and cell wall extensibility were estimated from plots of leaf growth rate versus turgor. Cell wall extensibility was also measured by the Instron technique, and yield threshold was determined experimentally both by stress relaxation in a psychrometer chamber and by incubation in a range of polyethylene glycol solutions. Once emerging leaves reached approximately 5 cm(2) in size, increases in leaf area were rapid throughout the expansive phase and varied little between light and dark periods. Both leaf growth rate and turgor were sensitive to changes in humidity, and in the longer term, both yield threshold and cell wall extensibility changed as the leaf aged. Rapidly expanding leaves had a very low yield threshold and high cell wall extensibility, whereas mature leaves had low cell wall extensibility. Yield threshold increased with leaf age.
Collapse
Affiliation(s)
- J C Metcalfe
- Institute of Environmental and Biological Sciences, University of Lancaster, Lancaster LA1 4YQ, United Kingdom
| | | | | |
Collapse
|
36
|
Pereira JS, Andrade LA, Bertolucci PH, Lima JG, Ferraz HB. The action of prolyl-leucyl-glycinamide (PLG) on the nigrostriatal pathway of the rat. Arq Neuropsiquiatr 1990; 48:156-60. [PMID: 1979732 DOI: 10.1590/s0004-282x1990000200002] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In order to study the nigrostriatal pathway, we obtained the rotatory behavior model in male Wistar rats by electrolytic lesion of the left lateral hypothalamic region. Animals thus lesioned displayed rotations toward the same side of lesion when apomorphine was administered, a result in disagreement with what has been obtained in the model with 6-hydroxydopamine lesion. The administration of PLG alone was not followed by rotatory behavior but when the compound was administered in low doses (0.25 to 1mg/kg) simultaneously with apomorphine to animals previously submitted to REM sleep deprivation, a significant increase in the number of rotations was observed in comparison with controls and groups receiving higher doses of PLG. These results indicate that PLG may act as a modulator on dopamine receptors in the striatum.
Collapse
Affiliation(s)
- J S Pereira
- Department of Neurology and Neurosurgery, Escola Paulista de Medicina São Paulo, Brasil
| | | | | | | | | |
Collapse
|
37
|
Abstract
Eucalyptus globulus Labill. seedlings grown under field conditions in Portugal were watered either daily (control) or every 6 days (drought-treated). Relative to those of control plants, rates of leaf production and leaf biomass accumulation were reduced by almost half in drought-treated plants. However, whereas expansion of new leaves on control plants slowed toward the end of the 30 day experiment, expansion of leaves of the same age on drought-treated plants accelerated as a change in weather conditions resulted in midday plant water potentials above -3.0 MPa. In plants that were left unwatered until they wilted and were then watered daily, expansion of the fifth leaf pair from the apex was slower than that of the same pair of leaves of plants watered daily throughout; but it continued for about twice as long and resulted in the same final leaf area. Drought treatment also caused a substantial reduction in the rate of leaf production, which, in part, accounted for the effect of drought on leaf biomass production. In a greenhouse study, witholding water for 15 days had only a slight effect on the length or width of adaxial epidermal cells, and the effect was quickly reversed on rewatering.
Collapse
Affiliation(s)
- J C Metcalfe
- Institute of Environmental and Biological Sciences, University of Lancaster, Lancaster LA1 4YQ, U.K
| | | | | |
Collapse
|
38
|
Abstract
We studied the effect of the angiotensin converting enzyme inhibitor, captopril, on two models of gastric ulcers; oxyphenbutazone and ethanol-induced lesions. There was a significant protective effect against oxyphenbutazone-induced ulcers, which was prevented by prior administration of indomethacin. Captopril, however, failed to protect against ethanol-induced lesions. These findings are discussed in the light of captopril being a sulfhydryl compound with prostaglandin-releasing activity.
Collapse
Affiliation(s)
- S A Bhounsule
- Department of Pharmacology, Goa Medical College, Bambolim, India
| | | | | | | |
Collapse
|
39
|
Correia MJ, Torres F, Pereira JS. Water and nutrient supply regimes and the water relations of juvenile leaves of Eucalyptus globulus. Tree Physiol 1989; 5:459-471. [PMID: 14972969 DOI: 10.1093/treephys/5.4.459] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Pressure-volume analysis was used to study effects of irrigation and fertilization on the water relations of newly expanded juvenile leaves of Eucalyptus globulus Labill. seedlings growing in Portugal's Atlantic region. In May, at the beginning of the dry season, fertilization and irrigation treatments had no significant effects on the water relations parameters investigated. In September, at the end of the dry season, leaves from non-irrigated plants had a significantly higher apoplasmic water content and a higher dry weight/turgid weight ratio than leaves of similar physiological age from irrigated trees. The osmotic potential at full turgor and the water potential at the wilting point were lower in non-irrigated than in irrigated plants. Changes in osmotic potential at full turgor were negatively correlated with changes in dry weight/turgid weight ratio, suggesting that reductions in osmotic potential at full turgor were largely the result of decreases in cell size. Fertilization had no detectable effect on these variables or on leaf tissue bulk modulus of elasticity. Tissue elasticity was also unaffected by irrigation. Independently of water and nutrient supplies, leaf elasticity was higher and relative water content at the wilting point lower in leaves sampled in May than in leaves sampled in September. In non-irrigated plants, leaves sampled in September had a lower tissue elasticity and a lower osmotic potential at full turgor than leaves sampled in May, indicating that leaves produced at the end of the dry season generate lower water potentials as turgor is lost than leaves expanded early in the season.
Collapse
Affiliation(s)
- M J Correia
- Universidade do Algarve, C. Gambelas, P-8004 Faro codex, Portugal
| | | | | |
Collapse
|
40
|
Demmig-Adams B, Adams WW, Winter K, Meyer A, Schreiber U, Pereira JS, Krüger A, Czygan FC, Lange OL. Photochemical efficiency of photosystem II, photon yield of O2 evolution, photosynthetic capacity, and carotenoid composition during the midday depression of net CO2 uptake in Arbutus unedo growing in Portugal. Planta 1989; 177:377-387. [PMID: 24212431 DOI: 10.1007/bf00403596] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/1988] [Accepted: 10/05/1988] [Indexed: 06/02/2023]
Abstract
During the "midday depression" of net CO2 exchange in the mediterranean sclerophyllous shrub Arbutus unedo, examined in the field in Portugal during August of 1987, several parameters indicative of photosynthetic competence were strongly and reversibly affected. These were the photochemical efficiency of photosystem (PS) II, measured as the ratio of variable to maximum chlorophyll fluorescence, as well as the photon yield and the capacity of photosynthetic O2 evolution at 10% CO2, of which the apparent photon yield of O2 evolution was most depressed. Furthermore, there was a strong and reversible increase in the content of the carotenoid zeaxanthin in the leaves that occurred at the expense of both violaxanthin and β-carotene. Diurnal changes in fluorescence characteristics were interpreted to indicate three concurrent effects on the photochemical system. First, an increase in the rate of radiationless energy dissipation in the antenna chlorophyll, reflected by changes in 77K fluorescence of PSII and PSI as well as in chlorophyll a fluorescence at ambient temperature. Second, a state shift characterized by an increase in the proportion of energy distributed to PSI as reflected by changes in PSI fluorescence. Third, an effect lowering the photon yield of O2 evolution and PSII fluorescence at ambient temperature without affecting PSII fluorescence at 77K which would be expected from a decrease in the activity of the water splitting enzyme system, i.e. a donor side limitation.
Collapse
Affiliation(s)
- B Demmig-Adams
- Institut für Botanik und Pharmazeutische Biologie, Universität Würzburg, Mittlerer Dallenbergweg 64, D-8700, Würzburg, Federal Republic of Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Ferraz HB, Bertolucci PH, Pereira JS, Lima JG, Andrade LA. Chronic exposure to the fungicide maneb may produce symptoms and signs of CNS manganese intoxication. Neurology 1988; 38:550-3. [PMID: 3352909 DOI: 10.1212/wnl.38.4.550] [Citation(s) in RCA: 157] [Impact Index Per Article: 4.4] [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: 01/05/2023] Open
Abstract
Manganese (Mn) poisoning, a well-known hazard in miners and industrial workers, shares many features with Parkinson's disease. Two young agricultural workers with a parkinsonian syndrome, who mentioned exposure to the fungicide maneb (manganese ethylene-bis-dithiocarbamate), led us to investigate a new possible source of Mn intoxication. Fifty male rural workers with occupational exposure to maneb were compared with 19 rural workers without fungicide exposure. We noted significantly higher prevalence of plastic rigidity with cogwheel phenomenon, headache, fatigue, nervousness, memory complaints, and sleepiness in the exposed group. In addition, we saw other neurologic signs, such as postural tremor, cerebellar signs, and bradykinesia, although without statistical significance. The data suggest that occupational exposure to pesticides containing Mn is a possible source of Mn intoxication of the CNS.
Collapse
Affiliation(s)
- H B Ferraz
- Department of Neurology and Neurosurgery, Escola Paulista de Medicina, São Paulo, Brazil
| | | | | | | | | |
Collapse
|
42
|
Pereira JS, Dhume VG, D'Souza RS, Abhraham GJ. Vascular desensitisation--possible role of prostaglandins. Indian J Physiol Pharmacol 1987; 31:42-50. [PMID: 2822577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Prolonged exposure to noradrenaline (NA) brings about an increase in the release of prostaglandin (PG)-like material from rat aortic strip. The release is greater with oxymetazoline while methoxamine decreases it. These effects are blocked by yohimbine and prazosin respectively. Pretreatment with 6-OHDA or reserpine diminishes the release of PG-like material. Barium chloride, a non-specific spasmogen, does not affect the release significantly. It appears therefore that the source of PG-like material is presynaptic and that its release mechanism is linked to an alpha 2 (alpha 2) adrenoceptor. It is proposed that this release of PG-like material contributes to the development of desensitisation in vascular tissue.
Collapse
Affiliation(s)
- J S Pereira
- Department of Pharmacology, Goa Medical College, Bambolim
| | | | | | | |
Collapse
|
43
|
Bertolucci PH, Andrade LA, Pereira JS, De Campos CJ. [Imotivated laughter: report of 3 cases]. Arq Neuropsiquiatr 1985; 43:66-72. [PMID: 4015440 DOI: 10.1590/s0004-282x1985000100010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The authors present three cases where the involuntary, imotivated laughter was a distinct finding. The first patient was a 29-year-old engineer, who had had several bursts of neurologic deficits, either sensitive or motor, which recovered almost completely and was diagnosed as suffering from multiple sclerosis. During and after one of the episodes he presented involuntary laughter and has been like this since then, albeit in much less extension. The second patient was a 35-year-old housewife, who presented several episodes of brain infarction in both hemispheres which were considered as being the result of arteritis. No specific collagen disease was found. The CAT scan showed several hypodense areas in both hemispheres. The third patient was a 52-year-old man of Japanese ancestry who presented three years ago a sudden ischemic stroke with difficulty in the speech and left sided weakness, followed by bursts of imotivated laughter, which persisted since then. Subsequently he had another stroke. He is hypertensive and diabetic. The authors searched the literature for the different causes of involuntary laughter. The occurrence in multiple sclerosis, although reported by several authors is by no means a common finding. In the literature available no case of cerebral arteritis with involuntary laughter could be found. The pathophysiology of this rare symptom was discussed.
Collapse
|
44
|
Abstract
The major breakthrough in the treatment of mental diseases was the introduction of neuroleptics in the early 50's. Soon after this an increasing number of patients under the use of these drugs presented involuntary abnormal orofacial movements which have been considered directly dependent on the drug action. The term "tardive dyskinesia" (TD) was coined for these movements. Many theories have been put forward to explain the pathophysiology of TD. The most prominent theory concerns with the possibility of denervation hypersensitivity occurring in striatal post-synaptic dopamine neurons. The authors review the most important theories and offer a new possibility based on the assumption that the post-synaptic dopamine receptors under chronic neuroleptic action develop a shift in its affinity towards the direction of agonist action. This means that the post-synaptic receptor increase its affinity, and possibly its number, to agonist drugs and dopamine. The paper includes a review of the main drugs used in this condition, attempting to explain the specific sites where they act, either in the dopaminergic, cholinergic or GABA--ergic systems.
Collapse
|
45
|
Ricardo JA, Negrao N, Pereira JS. Electrocorticographic activity of the prepyriform cortex during the sleep-wakefulness cycle of the freely-behaving rat. Arch Ital Biol 1980; 118:358-74. [PMID: 7212914] [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: 01/24/2023]
Abstract
The electrocorticographic (ECoG) behavior of prepyriform cortex (PPC) was studied during the spontaneous sleep-wakefulness cycle (SWC) of freely-behaving rats in which recording electrodes had been chronically implanted in PPC, neocortex (NEO), entorhinal area, olfactory bulb (OB), hippocampus, and dorsal neck muscles. The different phases of the SWC were discerned by taking into account the NEO, OB and neck musculature electrical activities, and criteria were set for the identification of various PPC ECoG patterns. The existence of rather regular associations between the PPC ECoG and the various SWC phases was demonstrated, but it was also seen that these associations defied simplistic generalizations. Thus, whereas the level of ECoG activity (in terms of synchronization vs. desynchronization) was, in the majority of instances, equivalent in PPC and NEO in some SWC phases (alert wakefulness, synchronized sleep and paradoxical sleep), the same was not true in the case of the relaxed wakefulness, drowsiness, intermediary and preparadoxical phases. In the same context, when the time relationships between the alternations of different SWC phases and PPC ECoG patterns were analyzed, it became clear that although only rarely the PPC transition occurred after the correspondent SWC one, the former could either precede, or be simultaneous with the latter, depending on the particular SWC transition being considered. The neural control mechanisms possibly responsible for the coupling of PPC and NEo EcoG activities are briefly discussed.
Collapse
|
46
|
|
47
|
Abraham GJ, Dhume VG, Diniz RS, Pereira JS. Effect of met-enkephalin on the responses of rat fundus and colon and chick rectum to PGE2 and its release from rat aortic strip. Pharmacol Res Commun 1980; 12:131-7. [PMID: 7384168 DOI: 10.1016/s0031-6989(80)80070-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
48
|
Dhume VG, Pereira JS, Diniz RS, Abraham GJ. Contraction of cat nictitating membrane by tetramisole. Arch Int Pharmacodyn Ther 1979; 238:14-8. [PMID: 485698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Tetramisole produced a dose-dependent persistent contraction of cat nictitating membrane. This was not significantly altered by prior adrenalectomy or reserpinisation and tyraminisation, but was abolished by prior alpha blockade.
Collapse
|
49
|
Pereira JS. [Staffing of overseas hospitals with nursing personnel]. An Inst Med Trop (Lisb) 1966; 23:257-61. [PMID: 5986691] [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: 01/17/2023]
|
50
|
Pereira JS. [Hospital clinical records]. An Inst Med Trop (Lisb) 1966; 23:249-56. [PMID: 5986690] [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: 01/17/2023]
|