1
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Vaja R, Ferreira PM, Want L, Ahmetaj-Shala B, Gashaw H, Kirkby NS, Mitchell JA. SWATH proteomic analysis from the standard care versus celecoxib outcome trial identifies renal biomarkers are associated with early cardiovascular events amongst NSAID users. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.3045] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Despite being one of the most commonly used and readily available drugs worldwide, we still do not understand why non-steroidal anti-inflammatory drugs (NSAIDs) increase cardiovascular risk. A proteomics approach may provide mechanistic insight into how COX-2 protects the cardiovascular system.
Purpose
To use SWATH proteomics to identify cardiovascular biomarkers in NSAID users who go onto have a cardiovascular event.
Methods
A case control study was designed using the Standard Care Versus Celecoxib Outcome Trial (SCOT) biobank (1). Serum samples from 228 NSAID users with osteoarthritis were analysed. From these, an exploratory analysis of 15 individuals who had a cardiovascular event within 6 months were compared to 213 individuals who did not. SWATH proteomics was used to identify biomarkers and findings were validated by immunoassay.
Results
Seventy-eight proteins were detected at significantly different levels in serum from participants who did or did not have an event within 6 months of enrolment. Of these the greatest increase in the event group was in levels of the renal dysfunction marker, cystatin C (Log Fold difference 1.4, p<0.001). Validation using a renal biomarker immunoassay panel confirmed a higher level of cystatin C (Z-score 0.6 vs −0.04, p: 0.02) as well as a lower level of uromodulin (Z-score −0.5 vs 0.03, p: 0.036) in the event group. In agreement, mass spectrometry analysis identified a higher level of the cardio-renal biomarker asymmetric dimethylarginine (ADMA) in the event group (Z-score 0.4 vs −0.03, p: 0.07) (Figure 1).
Conclusion
Renal biomarkers are associated with early cardiovascular events amongst NSAID users in the SCOT cohort. Thus, changes in renal function should be investigated as a mechanistic or predictive factor in this population at elevated cardiovascular risk.
Funding Acknowledgement
Type of funding sources: Foundation. Main funding source(s): British Heart Foundation
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Affiliation(s)
- R Vaja
- Imperial College London , London , United Kingdom
| | - P M Ferreira
- Imperial College London , London , United Kingdom
| | - L Want
- Imperial College London , London , United Kingdom
| | | | - H Gashaw
- Imperial College London , London , United Kingdom
| | - N S Kirkby
- Imperial College London , London , United Kingdom
| | - J A Mitchell
- Imperial College London , London , United Kingdom
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2
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Ferreira PM, Majuste D, Freitas ETF, Caldeira CL, Dantas MSS, Ciminelli VST. Galvanic effect of pyrite on arsenic release from arsenopyrite dissolution in oxygen-depleted and oxygen-saturated circumneutral solutions. J Hazard Mater 2021; 412:125236. [PMID: 33529834 DOI: 10.1016/j.jhazmat.2021.125236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 06/12/2023]
Abstract
Arsenopyrite (FeAsS), the most common arsenic-bearing mineral, is usually found associated with pyrite (FeS2) in gold mining tailings. This work examined the galvanic effect of FeS2 on As release from FeAsS oxidation in circumneutral media under oxygen-depleted and oxygen-saturated conditions. The oxidation experiments were conducted with a flow-through reactor in the absence of FeS2 particles and in the presence of different contents of this sulfide. The results indicated that the permanent, physical contact between FeAsS and FeS2 particles causes an increase in the accumulated As release, mainly under O2-saturated conditions. At 30% wt. FeS2, the increases relatively to FeS2-free conditions were 82% and 117% in O2-depleted and O2-saturated solutions, respectively. At steady-state, the As release rates increased from (4.9 ± 0.5)× 10-4 µmol m-2 s-1 (0% wt. FeS2) to (1.1-1.9)× 10-3 µmol m-2 s-1 (5-30% wt. FeS2) under O2-saturated conditions. Analysis of FeAsS samples after oxidation revealed oxidized particles partially or entirely covered by precipitates with different sizes, shapes and compositions (e.g., As-S-bearing ferrihydrite, elemental sulfur, and As-O phases). A fine (3-4 nm thick) amorphous layer of S-As-bearing ferric oxy-hydroxide was also identified on oxidized FeAsS, with Fe(III) and As(III) species.
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Affiliation(s)
- P M Ferreira
- Department of Materials and Metallurgical Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil
| | - D Majuste
- Department of Materials and Metallurgical Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil; INCT - ACQUA (National Institute of Science and Technology on Mineral Resources, Water and Biodiversity), Belo Horizonte, MG 31270-901, Brazil.
| | - E T F Freitas
- Centro de Microscopia (CM), Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil
| | - C L Caldeira
- Department of Materials and Metallurgical Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil; INCT - ACQUA (National Institute of Science and Technology on Mineral Resources, Water and Biodiversity), Belo Horizonte, MG 31270-901, Brazil
| | - M S S Dantas
- INCT - ACQUA (National Institute of Science and Technology on Mineral Resources, Water and Biodiversity), Belo Horizonte, MG 31270-901, Brazil
| | - V S T Ciminelli
- Department of Materials and Metallurgical Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil; INCT - ACQUA (National Institute of Science and Technology on Mineral Resources, Water and Biodiversity), Belo Horizonte, MG 31270-901, Brazil
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Rocha SQ, Avelino-Silva VI, Tancredi MV, Jamal LF, Ferreira PRA, Tayra A, Ferreira PM, Carvalhanas T, Domingues CSB, Souza RA, Gianna MC, Kalichman AO, Leite OHM, Souza TNL, Gomes E Costa DA, Furtado JJD, Costa AF. COVID-19 and HIV/AIDS in a cohort study in Sao Paulo, Brazil: outcomes and disparities by race and schooling. AIDS Care 2021; 34:832-838. [PMID: 34082616 DOI: 10.1080/09540121.2021.1936444] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Studies describing characteristics and outcomes of COVID-19 among people living with HIV are currently limited, lacking detailed evaluation of the interplay among demographics, HIV-related variables, and comorbidities on COVID-19 outcomes. This retrospective cohort study describes mortality rates overall and according to demographic characteristics and explores predictors of admission to intensive care unit and death among 255 persons living with HIV with severe acute respiratory syndrome and confirmed SARS-CoV-2 infection in the State of Sao Paulo, Brazil. We found that the overall mortality rate was 4.1/1,000 person-days, with a case-fatality of 34%. Higher rates occurred among older adults, Black/Mixed skin color/race patients, and those with lower schooling. In a multivariable analysis adjusted for age, sex, CD4 count, viral load and number of comorbidities, skin color/race, and schooling remained significantly associated with higher mortality. Although tenofovir use was more frequent among survivors in the univariable analysis, we failed to find a statistically significant association between tenofovir use and survival in the multivariable analysis. Our findings suggest that social vulnerabilities related to both HIV and COVID-19 significantly impact the risk of death, overtaking traditional risk factors such as age, sex, CD4 count, and comorbidities.
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Affiliation(s)
- S Q Rocha
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - V I Avelino-Silva
- Department of Infectious and Parasitic Diseases, Faculdade de Medicina da Universidade de São Paulo (HC-FMUSP), São Paulo, Brazil
| | - M V Tancredi
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - L F Jamal
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - P R A Ferreira
- Disciplina de Infectologia, Escola Paulista de Medicina - Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - A Tayra
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - P M Ferreira
- Centro de Vigilância Epidemiológica - São Paulo (CVE), São Paulo, Brazil
| | - T Carvalhanas
- Centro de Vigilância Epidemiológica - São Paulo (CVE), São Paulo, Brazil
| | - C S B Domingues
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - R A Souza
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - M C Gianna
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - A O Kalichman
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
| | - O H M Leite
- Faculdade de Medicina do ABC - Centro Universitário Saúde do ABC (FM-ABC) Santo Andre, Brazil
| | - T N L Souza
- Instituto de Infectologia Emílio Ribas - SES/SP (IIER), São Paulo, Brazil
| | - D A Gomes E Costa
- Hospital do Servidor Público Estadual de São Paulo (HSPE), São Paulo, Brazil
| | | | - A F Costa
- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil.,Department of Infectious and Parasitic Diseases, Faculdade de Medicina da Universidade de São Paulo (HC-FMUSP), São Paulo, Brazil
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- Centro de Referência e Treinamento DST/Aids - São Paulo (CRT-DST/Aids) Sao Paulo, Brazil
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4
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Ferreira PM, Bozbas E, Tannetta SD, Alroqaiba N, Zhou R, Crawley JTB, Gibbins JM, Jones CI, Ahnström J, Yaqoob P. Mode of induction of platelet-derived extracellular vesicles is a critical determinant of their phenotype and function. Sci Rep 2020; 10:18061. [PMID: 33093473 PMCID: PMC7582134 DOI: 10.1038/s41598-020-73005-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [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: 04/28/2020] [Accepted: 08/24/2020] [Indexed: 02/06/2023] Open
Abstract
Platelet-derived extracellular vesicles (PDEVs) are the most abundant amongst all types of EVs in the circulation. However, the mechanisms leading to PDEVs release, their role in coagulation and phenotypic composition are poorly understood. PDEVs from washed platelets were generated using different stimuli and were characterised using nanoparticle tracking analysis. Procoagulant properties were evaluated by fluorescence flow cytometry and calibrated automated thrombography. EVs from plasma were isolated and concentrated using a novel protocol involving a combination of size exclusion chromatography and differential centrifugation, which produces pure and concentrated EVs. Agonist stimulation enhanced PDEV release, but did not alter the average size of EVs compared to those produced by unstimulated platelets. Agonist stimulation led to lower negatively-charged phospholipid externalization in PDEVs, which was reflected in the lower procoagulant activity compared to those generated without agonist stimulation. Circulating EVs did not have externalized negatively-charged phospholipids. None of the 4 types of EVs presented tissue factor. The mechanism by which PDEV formation is induced is a critical determinant of its phenotype and function. Importantly, we have developed methods to obtain clean, concentrated and functional EVs derived from platelet-free plasma and washed platelets, which can be used to provide novel insight into their biological functions.
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Affiliation(s)
- P M Ferreira
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK
| | - E Bozbas
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK
| | - S D Tannetta
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK
| | - N Alroqaiba
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK
| | - R Zhou
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK
| | - J T B Crawley
- Department of Immunology and Inflammation, Centre for Haematology, Imperial College London, London, UK
| | - J M Gibbins
- Institute for Cardiovascular & Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - C I Jones
- Institute for Cardiovascular & Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - J Ahnström
- Department of Immunology and Inflammation, Centre for Haematology, Imperial College London, London, UK
| | - P Yaqoob
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, RG6 6AP, UK.
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5
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Wang F, Toombs NJ, Kesavadas T, Ferreira PM. Mechanical Design and Modeling of a Manipulator Tool for a Compact Multiple-Tool Single Port Laparoscopic Robot Platform. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:5836-5841. [PMID: 31947179 DOI: 10.1109/embc.2019.8857539] [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: 11/07/2022]
Abstract
Laparoendoscopic single-site surgery (LESS) has been shown to reduce the invasiveness of surgery by requiring only one incision to access the abdominal cavity. However, single-site surgery integrating with a compact robotic surgical platform remains as a unique challenge. To address this challenge, we have designed a comprehensive robotic surgery platform that consists of three 6-DOF manipulators and a laparoscope camera can all be inserted into the operation field through a single 18 mm cannula holding by one 4 degrees of freedom light-weight supporting frame. Each dexterous manipulator is 5+1 degree-of-freedom (DOF), serially inserted and removable, and remotely driven by 12 actuation tendons and is composed of rigid links joined by hybrid flexure hinges. This paper introduces the compact multiple-tool single port laparoscopic robot platform for the first time. Details of the mechanical design of the trocar and manipulator including joint design and tendon routing are presented. The forward and inverse kinematics of the manipulator are also discussed along with an analysis and simulation of the cooperative workspace of two manipulators. A preliminary dynamic model of the manipulator was also constructed to study the effect of tendon-sheath friction forces at various joint configurations. Future work will illustrate the existing supporting frame mechanism for posing tools and trocar.
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6
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Turones LC, Cruz KRD, Camargo-Silva G, Reis-Silva LL, Graziani D, Ferreira PM, Galdino PM, Pedrino GR, Santos R, Costa EA, Ianzer D, Xavier CH. Behavioral effects of Bj-PRO-7a, a proline-rich oligopeptide from Bothrops jararaca venom. Braz J Med Biol Res 2020; 52:e8441. [PMID: 31721904 PMCID: PMC6853074 DOI: 10.1590/1414-431x20198441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 08/30/2019] [Indexed: 11/22/2022] Open
Abstract
The heptapeptide Bj-PRO-7a, isolated and identified from Bothrops jararaca (Bj) venom, produces antihypertensive and other cardiovascular effects that are independent on angiotensin converting enzyme inhibition, possibly relying on cholinergic muscarinic receptors subtype 1 (M1R). However, whether Bj-PRO-7a acts upon the central nervous system and modifies behavior is yet to be determined. Therefore, the aims of this study were: i) to assess the effects of acute administration of Bj-PRO-7a upon behavior; ii) to reveal mechanisms involved in the effects of Bj-PRO-7a upon locomotion/exploration, anxiety, and depression-like behaviors. For this purpose, adult male Wistar (WT, wild type) and spontaneous hypertensive rats (SHR) received intraperitoneal injections of vehicle (0.9% NaCl), diazepam (2 mg/kg), imipramine (15 mg/kg), Bj-PRO-7a (71, 213 or 426 nmol/kg), pirenzepine (852 nmol/kg), α-methyl-DL-tyrosine (200 mg/kg), or chlorpromazine (2 mg/kg), and underwent elevated plus maze, open field, and forced swimming tests. The heptapeptide promoted anxiolytic and antidepressant-like effects and increased locomotion/exploration. These effects of Bj-PRO-7a seem to be dependent on M1R activation and dopaminergic receptors and rely on catecholaminergic pathways.
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Affiliation(s)
- L C Turones
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - K R da Cruz
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - G Camargo-Silva
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - L L Reis-Silva
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - D Graziani
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - P M Ferreira
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - P M Galdino
- Laboratório de Farmacologia de Produtos Naturais e Sintéticos, Departamento de Farmacologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - G R Pedrino
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - R Santos
- Departamento de Fisiologia e Biofísica, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
| | - E A Costa
- Laboratório de Farmacologia de Produtos Naturais e Sintéticos, Departamento de Farmacologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - D Ianzer
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - C H Xavier
- Laboratório de Neurobiologia de Sistemas, Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
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7
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Ferreira PM, Rodrigues LA, de Alencar Carnib LP, de Lima Sousa PV, Nolasco Lugo LM, Nunes NM, do Nascimento Silva J, da Silva Araûjo L, de Macêdo Gonçalves Frota K. Cruciferous Vegetables as Antioxidative, Chemopreventive and Antineoplasic Functional Foods: Preclinical and Clinical Evidences of Sulforaphane Against Prostate Cancers. Curr Pharm Des 2019; 24:4779-4793. [DOI: 10.2174/1381612825666190116124233] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 12/26/2018] [Accepted: 01/03/2019] [Indexed: 11/22/2022]
Abstract
Background:
Sulforaphane (SF, 1-isothiocyanato-4-(methyl-sulfinyl)-butane) is found in broccoli,
cabbage and cauliflower.
Methods:
we performed a critical review on the antioxidative, chemopreventive and antitumor effects of SF from
cruciferous vegetables against prostate cancers and molecular pathways. For a complete and reliable review,
primary and secondary resources were used, including original and review articles, books and government documents
published until March 2018. Articles that are in duplicity and disconnected are not considered for review.
SF is derived from glucoraphanin (4-methyl-sulfinyl-butyl-glucosinate), being one of the most commonly found
isothiocyanates in vegetables from Brassica spp., especially in broccoli samples. In vitro studies indicate that SF
induces apoptosis in a dependent or non-dependent method of androgens by transcription of tumor suppressor
genes, oxidation response and higher expression of phase II enzymes in prostate cancer cells. Sulforaphane also
decreases transcription of the nuclear factor kB and antiapoptotic proteins, expression of cyclin D2 and survivin
and DNA synthesis, increases Nrf2 gene activity, interferes with genome compacting by inhibition of histone
deacetylases and disrupts Hsp90 complexes, which cause cell cycle arrest, mitosis interruption, activation of
caspases and mitochondria depolarization.
Conclusion:
SF and cruciferous vegetables play antioxidative and chemopreventive role, delaying or blocking in
vivo carcinogenesis, causing biochemical and epigenetic changes, preventing, delaying, or reversing preneoplastic
or advanced prostate lesions, and frequently activating tumor cell death by intrinsic methods of apoptosis. These
outcomes encourage the consumption of Brassica specimens, which could be easily achieved by the incorporation
of food and vegetables rich in cruciferous isothiocyanates in the diet.
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Affiliation(s)
- Paulo M.P. Ferreira
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Lays A.R.L. Rodrigues
- Department of Nutrition, Postgraduate Program in Foods and Nutrition, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Lunna Paula de Alencar Carnib
- Department of Nutrition, Postgraduate Program in Foods and Nutrition, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Paulo Víctor de Lima Sousa
- Department of Nutrition, Postgraduate Program in Foods and Nutrition, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Luis Michel Nolasco Lugo
- Department of Nutrition, Postgraduate Program in Foods and Nutrition, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Nárcia M.F. Nunes
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | - Jurandy do Nascimento Silva
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
| | | | - Karoline de Macêdo Gonçalves Frota
- Department of Nutrition, Postgraduate Program in Foods and Nutrition, Federal University of Piaui, Universitaria Avenue, Ininga, 64049-550, Teresina, Brazil
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8
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Sadhu J, Tian H, Ma J, Azeredo B, Kim J, Balasundaram K, Zhang C, Li X, Ferreira PM, Sinha S. Quenched phonon drag in silicon nanowires reveals significant effect in the bulk at room temperature. Nano Lett 2015; 15:3159-3165. [PMID: 25831487 DOI: 10.1021/acs.nanolett.5b00267] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Existing theory and data cannot quantify the contribution of phonon drag to the Seebeck coefficient (S) in semiconductors at room temperature. We show that this is possible through comparative measurements between nanowires and the bulk. Phonon boundary scattering completely quenches phonon drag in silicon nanowires enabling quantification of its contribution to S in bulk silicon in the range 25-500 K. The contribution is surprisingly large (∼34%) at 300 K even at doping of ∼3 × 10(19) cm(-3). Our results contradict the notion that phonon drag is negligible in degenerate semiconductors at temperatures relevant for thermoelectric energy conversion. A revised theory of electron-phonon momentum exchange that accounts for a phonon mean free path spectrum agrees well with the data.
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Affiliation(s)
- Jyothi Sadhu
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Hongxiang Tian
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Jun Ma
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Bruno Azeredo
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Junhwan Kim
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Karthik Balasundaram
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Chen Zhang
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - Xiuling Li
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - P M Ferreira
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
| | - S Sinha
- †Department of Mechanical Science and Engineering, ‡Department of Electrical and Computer Engineering, and §Micro and Nanotechnology Laboratory, University of Ilinois at Urbana-Champaign, Urbana Illinois 61801, United States
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9
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Ferreira MF, Mousavi B, Ferreira PM, Martins CIO, Helm L, Martins JA, Geraldes CFGC. Gold nanoparticles functionalised with stable, fast water exchanging Gd3+ chelates as high relaxivity contrast agents for MRI. Dalton Trans 2012; 41:5472-5. [PMID: 22467054 DOI: 10.1039/c2dt30388d] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Gold nanoparticles functionalized with Gd(3+) chelates displaying fast water exchange, superb pH stability and inertness towards transmetalation with Zn(2+) have been prepared and characterized as a new high relaxivity (29 mM(-1) s(-1), 30 MHz, 25 °C) contrast agent potentially safe for in vivo MRI applications. The Lipari-Szabo treatment for internal rotation was used to evaluate the effect of linker flexibility on the relaxivity of the gold nanoparticles. The effect of fast water exchange on the relaxivity of gold nanoparticles functionalized with Gd(3+) chelates is also addressed in this communication.
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Affiliation(s)
- M F Ferreira
- Centro de Química, Campus de Gualtar, Universidade do Minho, Braga, Portugal
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Jacobs KE, Hsu KH, Han X, Kumar A, Azeredo BP, Fang NX, Ferreira PM. Solid-state superionic stamping with silver iodide-silver metaphosphate glass. Nanotechnology 2011; 22:425301. [PMID: 21934195 DOI: 10.1088/0957-4484/22/42/425301] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This paper demonstrates and analyzes the new use of the glassy solid electrolyte AgI-AgPO(3) for direct nanopatterning of thin silver films with feature resolutions of 30 nm. AgI-AgPO(3) has a high room temperature ionic conductivity with Ag( + ) as the mobile ion, leading to silver etch/patterning rates of up to 20 nm s( - 1) at an applied bias of 300 mV. The glass can be melt-processed at temperatures below 200 °C, providing a facile and economical pathway for creating large area stamps, including the 25 mm(2) stamps shown in this study. Further, the glass is sufficiently transparent to permit integration with existing tools such as aligners and imprint tools, enabling high overlay registration accuracy and facilitating insertion into multi-step fabrication recipes.
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Affiliation(s)
- K E Jacobs
- Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA
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Abstract
In this paper, we report direct patterning of metal nanostructures using an embossed solid electrochemical stamp. Microforming of solid superionic stamps using Si templates--analogous to polymer patterning in nano-imprint lithography--is explored. Silver sulfide (Ag₂S)--a superionic conductor with excellent microforming properties--is investigated as a candidate material. Important parameters of the superionic stamp, including mechanical behavior, material flow during forming and feature recovery after embossing, are studied. Excellent feature transferability during embossing as well as etching is observed. To illustrate the capability of this approach silver nano-antennas with gaps < 10 nm were successfully fabricated. The possibility for large area patterning with stamp diameters > 6 mm is also demonstrated. Embossing-based metal patterning allows fabrication beyond two-dimensional nanofabrication and several patterning schemes are reported.
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Affiliation(s)
- A Kumar
- Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 1406 W Green Street, Urbana, IL 61801, USA.
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Ferreira PM, Carvalho AF, Farias DF, Cariolano NG, Melo VM, Queiroz MG, Martins AM, Machado-Neto JG. Larvicidal activity of the water extract of Moringa oleifera seeds against Aedes aegypti and its toxicity upon laboratory animals. AN ACAD BRAS CIENC 2009; 81:207-16. [DOI: 10.1590/s0001-37652009000200007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2008] [Accepted: 02/17/2009] [Indexed: 11/22/2022] Open
Abstract
In this work, biological effects of the water extract of Moringa oleifera seeds (WEMOS) were assessed on eggs and 3rd instar larvae of Aedes aegypti and on its toxicity upon laboratory animals (Daphnia magna, mice and rats). Crude WEMOS showed a LC50 value of 1260µg/mL, causing 99.2 ± 2.9% larvae mortality within 24 h at 5200µg/mL, though this larvicidal activity has been lost completely at 80ºC/10 min. WEMOS did not demonstrate capacity to prevent egg hatching. After extensive dialyses of the crude WEMOS into watersoluble dialyzable (DF) and nondyalizable (NDF) fractions, only DF maintained its efficacy to kill larvae. Acute toxicity evaluations on daphnids (EC50 of 188.7µg/mL) and mice (LD50 of 446.5 mg/kg body weight) pointed out to low toxicity. Despite the thymus hypertrophy, WEMOS revealed to be harmless in orally and subacutelytreated rats. In conclusion, WEMOS has thermostable bioactive compounds against Ae. aegypti larvae with apparent molecular mass lower than 12 kDa and moderately toxic potential.
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Rodrigues MC, Campagnole-Santos MJ, Machado RP, Silva ME, Rocha JLM, Ferreira PM, Santos RAS, Alzamora AC. Evidence for a role of AT(2) receptors at the CVLM in the cardiovascular changes induced by low-intensity physical activity in renovascular hypertensive rats. Peptides 2007; 28:1375-82. [PMID: 17629353 DOI: 10.1016/j.peptides.2007.06.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2007] [Revised: 06/04/2007] [Accepted: 06/04/2007] [Indexed: 11/25/2022]
Abstract
In the present study, we evaluated the involvement of the rennin-angiotensin system (RAS) in the control of the blood pressure (BP), baroreceptor-mediated bradycardia and the reactivity of caudal ventrolateral medulla (CVLM) neurons to Ang II and to AT(2) receptor antagonist in sedentary or trained renovascular hypertensive rats. Physical activity did not significantly change the baseline mean arterial pressure (MAP), heart rate (HR) or the sensitivity of the baroreflex bradycardia in normotensive Sham rats. However, in 2K1C hypertensive rats, physical activity induced a significant fall in baseline MAP and HR and produced an improvement of the baroreflex function (bradycardic component). The microinjections of Ang II into the CVLM produced similar decreases in MAP in all groups, Sham and 2K1C, sedentary and trained rats. The hypotensive effect of Ang II at the CVLM was blocked by previous microinjection of the AT(2) receptors antagonist, PD123319, in all groups of rats. Unexpectedly, microinjection of PD123319 at the CVLM produced a depressor effect in 2K1C sedentary that was attenuated in 2K1C trained rats. No significant changes in MAP were observed after PD123319 in Sham rats, sedentary or trained. These data showed that low-intensity physical activity is effective in lowering blood pressure and restoring the sensitivity of the baroreflex bradycardia, however these cardiovascular effects are not accompanied by changes in the responsiveness to Ang II at CVLM in normotensive or hypertensive, 2K1C rats. In addition, the blood pressure changes observed after AT(2) blockade in 2K1C rats suggest that hypertension may trigger an imbalance of AT(1)/AT(2) receptors at the CVLM that may be restored, at least in part, by low-intensity physical activity.
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Affiliation(s)
- M C Rodrigues
- Departamento de Ciências Biológicas, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
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Ferreira PM, Medeiros R, Vasconcelos A, Costa S, Pinto D, Morais A, Oliveira J, Lopes C. Association between CYP2E1 polymorphisms and susceptibility to prostate cancer. Eur J Cancer Prev 2003; 12:205-11. [PMID: 12771559 DOI: 10.1097/00008469-200306000-00007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Several genetic alterations have been associated with sporadic prostate cancer (PCa). In this study, the association between RsaI and DraI polymorphisms of CYP2E1 and PCa risk was analysed in a case-control study of 227 individuals using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Regarding DraI polymorphisms, the DD genotype is over-represented in PCa cases when compared with the control group (odds ratio (OR) 2.12; 95% confidence interval (CI) 1.11-4.05; P=0.022). Regarding the RsaI polymorphism, no significant differences were found. The results of this study indicate that DraI polymorphisms of the CYP2E1 gene may be associated with a twofold increased risk for the development of PCa.
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Affiliation(s)
- P M Ferreira
- Molecular Oncology Unit, Instituto Português de Oncologia do Porto, Portugal.
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Vieira G, Ferreira PM, Matos LG, Ferreira EC, Rodovalho W, Ferri PH, Ferreira HD, Costa EA. Anti-in?ammatory effect ofSolanum lycocarpum fruits. Phytother Res 2003; 17:892-6. [PMID: 13680819 DOI: 10.1002/ptr.1247] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The croton oil-induced mouse ear oedema test, acetic acid-induced abdominal writhing, and carrageenan-induced peritonitis were used to study the anti-inflammatory effects of the crude ethanol extract and its alkaloid fraction from Solanum lycocarpum fruits. The alkaloid fraction induced a dose-dependent reduction in ear oedema formation and leukocyte migration, suggesting that S. lycocarpum fruits may contain steroidal alkaloids accounting for the anti-inflammatory effect of the crude ethanol extract.
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Affiliation(s)
- G Vieira
- Instituto de Ciências Biológicas, Departamento de Ciências Fisiológicas, Universidade Federal de Goiás, Goiânia, Brazil
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Alzamora AC, Ferreira PM, de Oliveira CN, Alzamora F, Vieira MA. Kinin receptors mediating the effect of bradykinin on gastric acid secretion. Regul Pept 1998; 73:113-7. [PMID: 9533815 DOI: 10.1016/s0167-0115(97)01071-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Kinins, and bradykinin in particular, can affect electrolyte transport in different segments of the intestine, thus being able to stimulate chloride secretion. Since the stomach is the main chloride secretory unit in the gastrointestinal tract, we have investigated the effect of bradykinin on acid secretion in the isolated frog (Rana catesbeiana) gastric mucosa. Bradykinin [2 x 10(-8) to 2 x 10(-6) M] and des-Arg9-bradykinin [2 x 10(-9) to 2 x 10(-7) M] were able to stimulate acid secretion in a dose-dependent manner. The bradykinin [2 x 10(-7) M] and des-Arg9-bradykinin (2 x 10(-8) M]-induced acid secretion was unaffected by Thi5,8,D-Phe7-bradykinin [2 x 10(-7) to 2 x 10(-5) M], a B2-kinin receptor antagonist. Interestingly, the B1-kinin receptor antagonist, des-Arg9-(Leu8)-bradykinin [2 x 10(-7) to 2 x 10(-5) M] blocked both bradykinin- and des-Arg9-bradykinin-stimulated acid secretion. Although the kininase I inhibitor, D-L-mercapto-methyl-3-guanidino-ethyl-propanoic acid [2 x 10(-6) and 2 x 10(-5) M] had no effect on des-Arg9-bradykinin-induced acid secretion, it inhibited the response to bradykinin. We conclude that bradykinin requires, at least in part, hydrolysis to des-Arg9-bradykinin to increase gastric acid secretion and that its effect is mediated by B1-kinin receptors.
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Affiliation(s)
- A C Alzamora
- Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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Conti PC, Ferreira PM, Pegoraro LF, Conti JV, Salvador MC. A cross-sectional study of prevalence and etiology of signs and symptoms of temporomandibular disorders in high school and university students. J Orofac Pain 1996; 10:254-62. [PMID: 9161230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The aim of this study was to evaluate the prevalence and need for treatment of temporomandibular disorders (TMD) in students living in Bauru, Brazil. The role of occlusal and emotional factors was also addressed. The presence and severity of TMD was determined by using a self-reported anamnestic questionnaire composed of 10 questions regarding common TMD symptoms. The symptoms were transposed into a severity classification according to the number and frequency of positive responses. Occlusal evaluation included an analysis of retruded contact position, intercuspal position, anterolateral guidance, and nonworking side contacts during mandibular movements. Palpation of the muscles and temporomandibular joints were performed to detect clinical signs of TMD. A chi square test was used to compare clinical and occlusal data with the presence and severity of TMD. A total of 0.65% of the subjects had severe TMD symptoms, 5.81% had moderate symptoms, and 34.84% had mild symptoms. Those with severe and moderate symptom levels were interpreted to be in need of treatment. Symptoms were found significantly more frequently in females than in males (P < .01). Self-reported emotional tension and parafunctional habits demonstrated strong associations with TMD (P < .01). Occlusion did not seem to influence the presence or severity of TMD. Based on these results, the efficacy of some traditional TMD treatments should be reconsidered, and reversible and conservative procedures should be the first choice for managing TMD patients.
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Affiliation(s)
- P C Conti
- Department of Prosthodontics, University of São Paulo Bauru School of Dentistry, Brazil
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Rubo JH, Pegoraro LF, Ferreira PM. A comparison of tensile bond strengths of resin-retained prostheses made using five alloys. INT J PROSTHODONT 1996; 9:277-81. [PMID: 8957864] [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: 02/03/2023]
Abstract
This in vitro study evaluated the bond strength of metal frameworks cast using Ni-Cr, Ni-Cr-Be, Cu-Al, type IV gold, and noble metal ceramic alloy with and without tin electroplating. The castings were luted to human teeth using Panavia Ex resin. It was found that tin electroplating had a negative effect for the Cu-Al and type IV gold alloys and a positive effect for gold for metal ceramic restorations. The best results were obtained using the Ni-Cr alloy.
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Affiliation(s)
- J H Rubo
- Department of Prosthodontics, Dental School of Bauru-University of Sao Paulo, Bauru, Brazil
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Affiliation(s)
- W H Mager
- Department of Biochemistry and Molecular Biology, Vrije Universiteit, Amsterdam, The Netherlands
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Hoekstra R, Ferreira PM, Bootsman TC, Mager WH, Planta RJ. Structure and expression of the ABF1-regulated ribosomal protein S33 gene in Kluyveromyces. Yeast 1992; 8:949-59. [PMID: 1481571 DOI: 10.1002/yea.320081105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The abundant multifunctional protein ABF1 of Saccharomyces cerevisiae binds to the upstream region of several genes, including some ribosomal protein genes like the one encoding protein S33. Deletion of the ABF1-binding sequence lowers the transcription of these genes three- to more than ten-fold. We have isolated the S33 genes of two related yeast species, Kluyveromyces lactis and Kluyveromyces marxianus. Comparison of the nucleotide sequences of these S33 genes with their counterpart from S. cerevisiae shows a strong sequence similarity covering the whole of the coding regions. In contrast, little or no sequence similarity is found in the 5'-flanking regions of the three genes. Also the trailer regions differ considerably in both length and sequence from one species to another. An ABF1-binding site is present in the upstream region of the S33 gene of K. marxianus. Retardation analyses showed that this sequence is able to bind a protein present in Kluyveromyces cells with a molecular mass somewhat lower than that of S. cerevisiae ABF1. Functional analyses, using a beta-glucuronidase reporter system, showed that the ABF1-binding site is indeed involved in transcription activation of the K. marxianus S33 gene in Kluyveromyces cells. A S. cerevisiae ABF1-gene-specific probe showed only weak hybridization with Kluyveromyces DNA and Northern blots did not show a signal. These results indicate that S. cerevisiae and Kluyveromyces contain functionally related but structurally dissimilar ABF1-type proteins.
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Affiliation(s)
- R Hoekstra
- Department of Biochemistry and Molecular Biology, Vrije Universiteit, Amsterdam, The Netherlands
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Ferreira PM, Roselino RB, Pandolfi RF, Pegoraro LF, de Araujo CDR, Rubo JH. [Surface roughness of investment samples and their metal castings]. Rev Odontol Univ Sao Paulo 1989; 3:317-23. [PMID: 2639453] [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: 01/01/2023]
Abstract
Three phosphate bonded investments and three calcium type were studied observing the influence of investment on the final cast surface roughness. Increased dilution also incremented roughness for the phosphate investments. Between the two types of investments there was only significant difference concerning two specific commercial brands, but there were differences in the same type of investment among these different brands.
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de Araujo CDR, Pandolfi RF, Bonachela V, Ferreira PM. [Comparative study of two technics for registration of centric relation]. Rev Odontol Univ Sao Paulo 1988; 2:73-6. [PMID: 3273726] [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: 01/05/2023]
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