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da Silva JR, Silva JFM, Pereira MF, Torres AR, Gonçalves MS, de Azevedo Prata MC, Vasconcelos Paiva E Brito MA, da Costa GM, Ribeiro JB. Is Galleria mellonella model a good alternative to study virulence in Staphylococcus aureus from bovine mastitis? Braz J Microbiol 2024; 55:889-900. [PMID: 38049660 PMCID: PMC10920502 DOI: 10.1007/s42770-023-01181-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/09/2023] [Indexed: 12/06/2023] Open
Abstract
Staphylococcus aureus is one of the agents of bovine mastitis of hardest control due to a complex pathogenesis comprising a variety of virulence factors, which ensures its persistence in the mammary gland, causing significant health and economic losses. Therefore, understanding the pathogenesis of this agent is imperative. Galleria mellonella has stood out as an invertebrate animal model for the study of infectious diseases that affect several hosts. This work aimed to evaluate G. mellonella larvae as an experimental model for the study of virulence phenotypes in an S. aureus population isolated from bovine mastitis. Thirty genetically divergent S. aureus strains were chosen based on PFGE analysis. After experimental infection, larvae survival rates, bacterial growth in hemolymph, melanization intensity of the dorsal vessel, and histological characteristics of the infected tissues were evaluated. The G. mellonella model showed a clear diversity in the S. aureus pathogenicity pattern, allowing the differentiation of strains with virulence phenotypes ranging from high to low degrees. Histological analysis confirmed that the strains tested were capable of inducing the formation of nodules and melanization spots in the dorsal vessels of the larvae in different magnitudes. The strains 16S-717, 19C-828, and 31S-1443 presented the highest virulence intensity among the bacteria tested and will be used further for the generation of S. aureus mutant populations to prospect genetic targets aimed to develop control strategies of bovine mastitis. Altogether, our results suggest that G. mellonella is an attractive and low-cost animal model for characterizing virulence phenotypes of large S. aureus populations.
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Affiliation(s)
- Juliana Rosa da Silva
- Department of Veterinay Medicine, Federal University of Lavras, Lavras, MG, 37200-000, Brazil
| | | | - Monalessa Fábia Pereira
- Department of Biological Sciences, State University of Minas Gerais, Carangola, MG, 36800-000, Brazil
| | | | - Maysa Serpa Gonçalves
- Department of Veterinay Medicine, Federal University of Lavras, Lavras, MG, 37200-000, Brazil
| | | | | | - Geraldo Márcio da Costa
- Department of Veterinay Medicine, Federal University of Lavras, Lavras, MG, 37200-000, Brazil.
| | - João Batista Ribeiro
- Brazilian Agricultural Research Corporation, Juiz de Fora, MG, 36038-330, Brazil.
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Andrade-Oliveira AL, Lacerda-Rodrigues G, Pereira MF, Bahia AC, Machado EDA, Rossi CC, Giambiagi-deMarval M. Tenebrio molitor as a model system to study Staphylococcus spp virulence and horizontal gene transfer. Microb Pathog 2023; 183:106304. [PMID: 37567328 DOI: 10.1016/j.micpath.2023.106304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/23/2023] [Accepted: 08/09/2023] [Indexed: 08/13/2023]
Abstract
Invertebrates can provide a valuable alternative to traditional vertebrate animal models for studying bacterial and fungal infections. This study aimed to establish the larvae of the coleoptera Tenebrio molitor (mealworm) as an in vivo model for evaluating virulence and horizontal gene transfer between Staphylococcus spp. After identifying the best conditions for rearing T. molitor, larvae were infected with different Staphylococcus species, resulting in dose-dependent killing curves. All species tested killed the insects at higher doses, with S. nepalensis and S. aureus being the most and least virulent, respectively. However, only S. nepalensis was able to kill more than 50% of larvae 72 h post-infection at a low amount of 105 CFU. Staphylococcus infection also stimulated an increase in the concentration of hemocytes present in the hemolymph, which was proportional to the virulence. To investigate T. molitor's suitability as an in vivo model for plasmid transfer studies, we used S. aureus strains as donor and recipient of a plasmid containing the gentamicin resistance gene aac(6')-aph(2″). By inoculating larvae with non-lethal doses of each, we observed conjugation, and obtained transconjugant colonies with a frequency of 1.6 × 10-5 per donor cell. This study demonstrates the potential of T. molitor larvae as a reliable and cost-effective model for analyzing the virulence of Staphylococcus and, for the first time, an optimal environment for the plasmid transfer between S. aureus carrying antimicrobial resistance genes.
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Affiliation(s)
- Ana Luisa Andrade-Oliveira
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Geovana Lacerda-Rodrigues
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Monalessa Fábia Pereira
- Departamento de Ciências Biológicas, Universidade do Estado de Minas Gerais, Carangola, MG, Brazil
| | - Ana Cristina Bahia
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil; Instituto Nacional de Ciencia e Tecnologia em Entomologia Molecular, Rio de Janeiro, Brazil
| | - Ednildo de Alcântara Machado
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil; Instituto Nacional de Ciencia e Tecnologia em Entomologia Molecular, Rio de Janeiro, Brazil
| | - Ciro César Rossi
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Marcia Giambiagi-deMarval
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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Borghi M, Pereira MF, Schuenck RP. The Presence of Virulent and Multidrug-Resistant Clones of Carbapenem-Resistant Klebsiella pneumoniae in Southeastern Brazil. Curr Microbiol 2023; 80:286. [PMID: 37453006 DOI: 10.1007/s00284-023-03403-z] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 07/04/2023] [Indexed: 07/18/2023]
Abstract
The emergence of carbapenem-resistant Klebsiella pneumoniae (CRKP) represents an urgent threat to global public health due to the limited therapeutic options available to control this pathogen. This study aims to analyze the molecular epidemiology, antimicrobial resistance and virulence profile of CRKP isolated from patients at hospitals in Southeastern Brazil. KPC and other beta-lactamase genes were detected in all strains, which were also multidrug-resistant (MDR). In addition, 11 strains showed resistance to last-resort antimicrobials, such as colistin and tigecycline. MLST analysis revealed eight different sequence types (ST11, ST37, ST147, ST340, ST384, ST394, ST437, and ST628), being two (ST628 and ST394) reported for the first time in Brazil. Strains belonging to the clonal complex 258 (CC258) "high-risk clones" were prevalent in this study. The Galleria mellonella model showed the emergence of virulent CRKP strains in the healthcare environment and, suggests that colistin-resistant strains were associated with higher virulence. This study shows the presence of virulent CRKP-MDR strains in hospitals across Southeastern Brazil, and draws attention to the presence of highly virulent emerging CRKP-MDR ST628 strains, showing that virulent and resistant clones can emerge quickly, requiring constant monitoring.
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Affiliation(s)
- Mirla Borghi
- Department of Pathology, Molecular Biology and Bacterial Virulence Laboratory, Health Sciences Center, Federal University of Espírito Santo, Av. Marechal Campos, s/no, Maruípe, Vitória, ES, 29043-900, Brazil
| | - Monalessa Fábia Pereira
- Department of Pathology, Molecular Biology and Bacterial Virulence Laboratory, Health Sciences Center, Federal University of Espírito Santo, Av. Marechal Campos, s/no, Maruípe, Vitória, ES, 29043-900, Brazil
- Department of Biological Sciences, State University of Minas Gerais, Carangola, MG, Brazil
| | - Ricardo Pinto Schuenck
- Department of Pathology, Molecular Biology and Bacterial Virulence Laboratory, Health Sciences Center, Federal University of Espírito Santo, Av. Marechal Campos, s/no, Maruípe, Vitória, ES, 29043-900, Brazil.
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Pereira MF, Lima MDBPLV, Ferreira AMMS, Pires BCFV, Santos DF, Lima VKA, Diniz MV, Silva AP, Bezerra MAC, Hatzlhofer BLD. COAGULOPATIAS RARAS: PERFIL CLÍNICO E LABORATORIAL NO ESTADO DE PERNAMBUCO. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Souza-Silva T, Rossi CC, Andrade-Oliveira AL, Vilar LC, Pereira MF, Penna BDA, Giambiagi-deMarval M. Interspecies transfer of plasmid-borne gentamicin resistance between Staphylococcus isolated from domestic dogs to Staphylococcus aureus. Infect Genet Evol 2022; 98:105230. [PMID: 35104683 DOI: 10.1016/j.meegid.2022.105230] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 01/19/2022] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
As preconized by the One Health concept, the intimate relationship between pets and owners is a common source for the trade of microorganisms with zoonotic potential, and with them, antimicrobial resistance genes. In this work, we evaluated the presence of antimicrobial resistance genes, that are usually within mobile genetic elements, in a laboratory collection of 79 canine Staphylococcus strains, mostly Staphylococcus pseudintermedius and Staphylococcus coagulans. Resistance to tetracycline was observed in 34% of the strains, followed by resistance to erythromycin (21%) and gentamicin (19%). These phenotypes were partially correlated with the presence of the tetracycline resistance genes tet(M) and tet(K) in 64% and 44% of all strains, respectively; erythromycin resistance genes erm(A) and erm(C) in 53% and 23%; and gentamicin resistance gene aac(6')-aph(2″) in 26% of the strains. At least 45% of the strains harbored high- and/or low-molecular weight plasmids, whose transfer may be facilitated by their widespread biofilm-forming capacity, and absence of restrictive CRISPR systems. We selected eight plasmid-bearing and multidrug resistant strains, which were submitted to plasmid curing by stress with SDS. No strain lost resistance during stressing cultivation but, by conjugation experiments, the S. pseudintermedius strain 27 transferred its plasmid-borne resistance to gentamicin, conferred by the aac(6')-aph(2″) gene, to Staphylococcus aureus. The frequent empirical use of gentamicin to treat skin and ear infections in domestic dogs is likely to select resistant strains. Also, as demonstrated by our study, these strains can serve as gene reservoirs for human pathogens, such as S. aureus.
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Affiliation(s)
- Thaysa Souza-Silva
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Ciro César Rossi
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil; Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Ana Luisa Andrade-Oliveira
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Lucas Cecílio Vilar
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Monalessa Fábia Pereira
- Departamento de Ciências Biológicas, Universidade do Estado de Minas Gerais, Carangola, MG, Brazil
| | | | - Marcia Giambiagi-deMarval
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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Bonhorst DH, Gracias R, Carvalho MG, Andrade ML, Tavares MA, Pereira MF, Bento R, Lima R, Halpern MJ, Macedo MM. Estudo da especificidade da isoenzima MB da creatinaquinase na cirurgia cardíaca com circulação extra-corporal (fases pré, intra e pós operatória). ACTA MEDICA PORT 2022. [DOI: 10.20344/amp.1239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Pereira MF, Rossi CC, da Silva GC, Rosa JN, Bazzolli DMS. Galleria mellonella as an infection model: an in-depth look at why it works and practical considerations for successful application. Pathog Dis 2021; 78:5909969. [PMID: 32960263 DOI: 10.1093/femspd/ftaa056] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 09/18/2020] [Indexed: 12/14/2022] Open
Abstract
The larva of the greater wax moth Galleria mellonella is an increasingly popular model for assessing the virulence of bacterial pathogens and the effectiveness of antimicrobial agents. In this review, we discuss details of the components of the G. mellonella larval immune system that underpin its use as an alternative infection model, and provide an updated overview of the state of the art of research with G. mellonella infection models to study bacterial virulence, and in the evaluation of antimicrobial efficacy. Emphasis is given to virulence studies with relevant human and veterinary pathogens, especially Escherichia coli and bacteria of the ESKAPE group. In addition, we make practical recommendations for larval rearing and testing, and overcoming potential limitations of the use of the model, which facilitate intra- and interlaboratory reproducibility.
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Affiliation(s)
- Monalessa Fábia Pereira
- Laboratório de Bioquímica e Microbiologia, Departamento de Ciências Biológicas, Universidade do Estado de Minas Gerais, 36800-000, Carangola, MG, Brazil
| | - Ciro César Rossi
- Laboratório de Microbiologia Molecular, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, 21941-901, Rio de Janeiro, RJ, Brazil
| | - Giarlã Cunha da Silva
- Laboratório de Genética Molecular de Bactérias, Instituto de Biotecnologia Aplicada à Agropecuária-BIOAGRO, Departamento de Microbiologia, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil
| | - Jéssica Nogueira Rosa
- Laboratório de Genética Molecular de Bactérias, Instituto de Biotecnologia Aplicada à Agropecuária-BIOAGRO, Departamento de Microbiologia, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil
| | - Denise Mara Soares Bazzolli
- Laboratório de Genética Molecular de Bactérias, Instituto de Biotecnologia Aplicada à Agropecuária-BIOAGRO, Departamento de Microbiologia, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil
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Rocha LFN, Rodrigues SS, Santos TB, Pereira MF, Rodrigues J. Detection of enteroparasites in foliar vegetables commercialized in street- and supermarkets in Aparecida de Goiânia, Goiás, Brazil. BRAZ J BIOL 2021; 82:e245368. [PMID: 34133576 DOI: 10.1590/1519-6984.245368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 11/16/2020] [Indexed: 11/22/2022] Open
Abstract
Foliar vegetables contaminated with fecal residues are an important route of transmission of intestinal parasites to humans. The aim of this study was to evaluate the presence of parasitic forms of protozoa and helminths on lettuces (Lactuca sativa) and collard greens (Brassica oleracea) sold in street- and supermarkets in the city of Aparecida de Goiânia, Goiás, Brazil. A total of 30 samples of each vegetable (15 samples from each supermarkets and street markets) was analyzed. All samples were processed by spontaneous sedimentation method and centrifugal flotation. In 45% of the samples, immature forms of intestinal parasites were identified with 66.7% helminths eggs and 33.3% protozoan cysts or oocysts. Significantly more lettuce samples were contaminated with eggs, cysts or oocyst of at least one parasite than collard green samples (U=216; Z=-3.45; P <0.001). The parasitic forms were identified morphologically up to the family level with eggs of Ancylostomatidae, Strongyloididae, Ascarididae and Taeniidae, or oocysts of Eimeriidae, to the genus with Cystoisospora sp. and Toxocara sp., and to the species level with Cystoisospora canis, Dipylidium caninum and Hymenolepis nana. The presence of these infective agents in lettuce and collard green from both street- and supermarkets highlights the high risk of spreading parasites by eating raw vegetables sold in Aparecida de Goiânia.
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Affiliation(s)
- L F N Rocha
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás - IFG, Aparecida de Goiânia, GO, Brasil
| | - S S Rodrigues
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás - IFG, Aparecida de Goiânia, GO, Brasil
| | - T B Santos
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás - IFG, Aparecida de Goiânia, GO, Brasil
| | - M F Pereira
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás - IFG, Aparecida de Goiânia, GO, Brasil
| | - J Rodrigues
- Universidade Federal de Goiás - UFG, Instituto de Patologia Tropical e Saúde Pública - IPTSP, Goiânia, GO, Brasil
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Teixeira LP, Gontijo LC, Franco Júnior AR, Pereira MF, Schuenck RP, Malacarne-Zanon J. Evaluation of antimicrobial potential and surface morphology in thin films of titanium nitride and calcium phosphate on orthodontic brackets. Am J Orthod Dentofacial Orthop 2021; 160:209-214. [PMID: 33975749 DOI: 10.1016/j.ajodo.2020.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 04/01/2020] [Accepted: 04/01/2020] [Indexed: 11/17/2022]
Abstract
INTRODUCTION The goal of this research was to experimentally evaluate the surface morphology and adhesion capacity of Streptococcus mutans (U159) on brackets with thin films of titanium nitride (TN) and of titanium nitride doped with calcium phosphate (TNCP). METHODS Twenty-four metallic brackets were equally allocated to 3 groups (n = 8), according to the type of covering (no covering, TNCP, and TN). The coatings were deposited by cathodic cage (TNCP and TN groups) and were evaluated by scanning electron microscopy and energy dispersive x-ray spectrometry. The biofilm formation of S. mutans on the surface of brackets was determined by crystal violet assay and subsequent optical density quantification. RESULTS There was homogeneity on the surface morphology of the tie wing area in all groups, whereas the TNCP group has presented particles in the slot. After 24 hours, a biofilm of S. mutans was formed in all the observed groups. The optical density obtained in all 3 groups was similar (no covering, 0.347 ± 0.042; TNCP, 0.238 ± 0.055; TN, 0.226 ± 0.057), with no statistically relevant difference (P = 0.06). CONCLUSIONS The thin film of TNCP has altered the surface of the bracket's slot, whereas the coatings of TN and TNCP have not altered the superficial morphology of the tie wings. The presence of coatings have not influenced the formation of the S. mutans biofilm on the surface of metallic brackets.
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Affiliation(s)
- Licia Pacheco Teixeira
- Graduate Program in Clinical Dentistry, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil.
| | - Leonardo Cabral Gontijo
- Graduate Program in Metallurgical and Materials Engineering, Federal Institute of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Adonias Ribeiro Franco Júnior
- Graduate Program in Metallurgical and Materials Engineering, Federal Institute of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Monalessa Fábia Pereira
- Department of Pathology, Graduate Program in Infectious Diseases, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ricardo Pinto Schuenck
- Department of Pathology, Graduate Program in Infectious Diseases, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Juliana Malacarne-Zanon
- Department of Prosthodontics, Graduate Program in Clinical Dentistry, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
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Pinto GC, Leal LB, Magalhães NC, Pereira MF, Vassallo PF, Pereira TM, Barauna VG, Byrne HJ, Carvalho LFCS. The potential of FT-IR spectroscopy for improving healthcare in sepsis - An animal model study. Photodiagnosis Photodyn Ther 2021; 34:102312. [PMID: 33930577 DOI: 10.1016/j.pdpdt.2021.102312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 04/07/2021] [Accepted: 04/23/2021] [Indexed: 11/25/2022]
Abstract
Fourier Transform-Infrared (FT-IR) absorption spectroscopy has been used to investigate pathophysiological changes caused by sepsis. Sepsis has been defined as a potentially fatal organic dysfunction caused by a dysregulated host response to infection and can lead a patient to risk of death. This study used samples consisting of the blood plasma of mice which were induced to sepsis state, compared to a healthy group using FT-IR associated with attenuated total reflectance (ATR) spectroscopy. For statistical analysis, principal components analysis (PCA) and linear discriminant analysis (LDA) were applied, independently, to the second derivative spectra of both the fingerprint (900-1800 cm-1) and the high wavenumber (2800-3100 cm-1) regions. The technique efficiently differentiated the blood plasma of the two groups, sepsis and healthy mice, the analysis indicating that fatty acids and lipids in the blood samples could be an important biomarker of sepsis.
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Affiliation(s)
- G C Pinto
- Post Graduation Program in Physiological Sciences, Federal University of Espírito Santo, Marechal Campos Ave, 1468, Maruípe, 29040-090, Vitória, Espírito Santo, Brazil
| | - L B Leal
- Post Graduation Program in Physiological Sciences, Federal University of Espírito Santo, Marechal Campos Ave, 1468, Maruípe, 29040-090, Vitória, Espírito Santo, Brazil.
| | - N C Magalhães
- Universidade de Taubaté. R. dos Operários, 09 - Centro, Taubaté, SP, 12020-340, Brazil
| | - M F Pereira
- Post Graduation Program in Physiological Sciences, Federal University of Espírito Santo, Marechal Campos Ave, 1468, Maruípe, 29040-090, Vitória, Espírito Santo, Brazil
| | - P F Vassallo
- Post Graduation Program in Physiological Sciences, Federal University of Espírito Santo, Marechal Campos Ave, 1468, Maruípe, 29040-090, Vitória, Espírito Santo, Brazil; Clinical Hospital, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - T M Pereira
- Universidade Federal do Estado de São Paulo. R. Talim, 330 - Vila Nair, São José dos Campos, SP, 12231-0, Brazil
| | - V G Barauna
- Department of Physiological Sciences, Federal University of Espírito Santo (UFES), Marechal Campos Ave, 1468, Maruípe, 29040-090, Vitória, Espírito Santo, Brazil
| | - H J Byrne
- FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - L F C S Carvalho
- Universidade de Taubaté. R. dos Operários, 09 - Centro, Taubaté, SP, 12020-340, Brazil; Centro Universitário Braz Cubas. Av. Francisco Rodrigues Filho, 1233 - Vila Mogilar, Mogi das Cruzes, SP, 08773-380, Brazil
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Crispim JS, da Silva TF, Sanches NM, da Silva GC, Pereira MF, Rossi CC, Li Y, Terra VS, Vohra P, Wren BW, Langford PR, Bossé JT, Bazzolli DMS. Serovar-dependent differences in Hfq-regulated phenotypes inActinobacillus pleuropneumoniae. Pathog Dis 2020; 78:5936557. [DOI: 10.1093/femspd/ftaa066] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/21/2020] [Indexed: 12/28/2022] Open
Abstract
ABSTRACTThe RNA chaperone Hfq regulates diverse processes in numerous bacteria. In this study, we compared phenotypes (growth rate, adherence, response to different stress conditions and virulence in Galleria mellonella) of wild-type (WT) and isogenic hfq mutants of three serovars (1, 8 and 15) of the porcine pathogen Actinobacillus pleuropneumoniae. Similar growth in rich broth was seen for all strains except Ap1∆hfq, which showed slightly reduced growth throughout the 24 h time course, and the complemented Ap8∆hfqC mutant had a prolonged lag phase. Differences were seen between the three serovar WT strains regarding adherence, stress response and virulence in G. mellonella, and deletion of hfq affected some, but not all of these phenotypes, depending on serovar. Complementation by expression of cloned hfq from an endogenous promoter only restored some WT phenotypes, indicating that complex regulatory networks may be involved, and that levels of Hfq may be as important as presence/absence of the protein regarding its contribution to gene regulation. Our results support that Hfq is a pleiotropic global regulator in A. pleuropneumoniae, but serovar-related differences exist. These results highlight the importance of testing multiple strains/serovars within a given species when determining contributions of global regulators, such as Hfq, to expression of complex phenotypes.
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Affiliation(s)
- Josicelli Souza Crispim
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Thyara Ferreira da Silva
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Newton Moreno Sanches
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Giarlã Cunha da Silva
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Monalessa Fábia Pereira
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Ciro César Rossi
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
| | - Yanwen Li
- Section of Paediatric Infectious Disease, Imperial College London, St Mary's Campus, London W2 1PG, UK
| | - Vanessa Sofia Terra
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Prerna Vohra
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Brendan W Wren
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Paul R Langford
- Section of Paediatric Infectious Disease, Imperial College London, St Mary's Campus, London W2 1PG, UK
| | - Janine T Bossé
- Section of Paediatric Infectious Disease, Imperial College London, St Mary's Campus, London W2 1PG, UK
| | - Denise Mara Soares Bazzolli
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
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12
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Pereira MF, Rossi CC. Overview of rearing and testing conditions and a guide for optimizing Galleria mellonella breeding and use in the laboratory for scientific purposes. APMIS 2020; 128:607-620. [PMID: 32970339 DOI: 10.1111/apm.13082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The greater wax moth Galleria mellonella is an increasingly popular and consolidated alternative infection model to assess microbial virulence and the effectiveness of antimicrobial compounds. The lack of G. mellonella suppliers aiming at scientific purposes and a lack of well-established protocols for raising and testing these animals may impact results and reproducibility between different laboratories. In this review, we discuss the state of the art of rearing the larvae in situ, providing an overview of breeding and testing conditions commonly used and their influence on larval health and experiments results, from setting up the environment, providing the ideal diet, understanding the effects of pretreatments, choosing the best testing conditions, to exploring the most from the results obtained. Meanwhile, we guide the reader through the most practical ways of dealing with G. mellonella to achieve successful experiments.
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Affiliation(s)
- Monalessa Fábia Pereira
- Laboratório de Bioquímica e Microbiologia, Departamento de Ciências Biológicas, Universidade do Estado de Minas Gerais, Carangola, MG, Brazil
| | - Ciro César Rossi
- Laboratório de Microbiologia Molecular, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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13
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Rossi CC, Pereira MF, Giambiagi-deMarval M. Underrated Staphylococcus species and their role in antimicrobial resistance spreading. Genet Mol Biol 2020; 43:e20190065. [PMID: 32052827 PMCID: PMC7198029 DOI: 10.1590/1678-4685-gmb-2019-0065] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [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: 02/26/2019] [Accepted: 05/06/2019] [Indexed: 01/06/2023] Open
Abstract
The increasing threat of antimicrobial resistance has shed light on the interconnection between humans, animals, the environment, and their roles in the exchange and spreading of resistance genes. In this review, we present evidences that show that Staphylococcus species, usually referred to as harmless or opportunistic pathogens, represent a threat to human and animal health for acting as reservoirs of antimicrobial resistance genes. The capacity of genetic exchange between isolates of different sources and species of the Staphylococcus genus is discussed with emphasis on mobile genetic elements, the contribution of biofilm formation, and evidences obtained either experimentally or through genome analyses. We also discuss the involvement of CRISPR-Cas systems in the limitation of horizontal gene transfer and its suitability as a molecular clock to describe the history of genetic exchange between staphylococci.
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Affiliation(s)
- Ciro César Rossi
- Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Paulo de Góes, Laboratório de Microbiologia Molecular, Rio de Janeiro, RJ, Brazil
| | | | - Marcia Giambiagi-deMarval
- Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Paulo de Góes, Laboratório de Microbiologia Molecular, Rio de Janeiro, RJ, Brazil
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Knidel C, Pereira MF, Barcelos DHF, Gomes DCDO, Guimarães MCC, Schuenck RP. Epigallocatechin gallate has antibacterial and antibiofilm activity in methicillin resistant and susceptible Staphylococcus aureus of different lineages in non-cytotoxic concentrations. Nat Prod Res 2019; 35:4643-4647. [DOI: 10.1080/14786419.2019.1698575] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Carina Knidel
- Department of Pathology, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Brazil
| | - Monalessa Fábia Pereira
- Department of Pathology, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Brazil
| | | | | | | | - Ricardo Pinto Schuenck
- Department of Pathology, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Brazil
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15
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Guerrieri CG, Pereira MF, Galdino ACM, Dos Santos ALS, Elias WP, Schuenck RP, Spano LC. Typical and Atypical Enteroaggregative Escherichia coli Are Both Virulent in the Galleria mellonella Model. Front Microbiol 2019; 10:1791. [PMID: 31456762 PMCID: PMC6700222 DOI: 10.3389/fmicb.2019.01791] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 07/19/2019] [Indexed: 12/16/2022] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is an emerging pathotype responsible for acute and persistent diarrhea. It can be classified as typical and atypical strains, respectively, based on the presence or absence of the AggR regulon, suggesting a higher virulence for typical EAEC. This study aims to evaluate in the Galleria mellonella model if there are differences in the virulence profiles among clinical strains of typical and atypical EAEC, prototype strains EAEC C1096, 042 and its aggR mutant. The clinical EAEC strains (n = 20) were analyzed for the presence of 22 putative virulence factors of EAEC or extraintestinal E. coli by PCR, as well as phenotypic characteristics of virulence (enzymes, siderophore, and biofilm). The survival of the larvae was analyzed after inoculation of 104-107 CFU/larva; the monitoring of bacterial growth in vivo and hemocyte quantification was determined after inoculation of the prototype strains (105 CFU/larva) at different periods after infection. The strains of typical and atypical EAEC presented the same virulence profile for the larva, regardless of the amount or type of genes and phenotypic aspects of virulence analyzed. In addition, the EAEC 042 aggR mutant strain showed a significant reduction in the mortality of the inoculated larvae compared to the wild-type strain. In conclusion, the results obtained herein demonstrate that the virulence of EAEC seems to be related to the AggR regulon, but not exclusively, and atypical EAEC strains may be as virulent as typical ones in vivo in the G. mellonella model.
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Affiliation(s)
- Caroline Gastaldi Guerrieri
- Laboratory of Virology and Infectious Gastroenteritis, Department of Pathology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Monalessa Fábia Pereira
- Laboratory of Virology and Infectious Gastroenteritis, Department of Pathology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Anna Clara Milesi Galdino
- Laboratory of Advanced Studies of Emerging and Resistant Microorganisms, Department of General Microbiology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - André Luis Souza Dos Santos
- Laboratory of Advanced Studies of Emerging and Resistant Microorganisms, Department of General Microbiology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Ricardo Pinto Schuenck
- Laboratory of Virology and Infectious Gastroenteritis, Department of Pathology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Liliana Cruz Spano
- Laboratory of Virology and Infectious Gastroenteritis, Department of Pathology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
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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.
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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
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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.
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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
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Bride LDL, Pereira MF, Barbosa MC, Silva NC, Klein NM, Nascimento TC, Schuenck RP. Differences in resistance profiles and virulence genes among methicillin-resistant and methicillin-susceptible Staphylococcus aureus of different lineages at a public tertiary hospital. Rev Soc Bras Med Trop 2019; 52:e20190095. [PMID: 31340369 DOI: 10.1590/0037-8682-0095-2019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 05/08/2019] [Indexed: 12/12/2022] Open
Abstract
INTRODUCTION Staphylococcus aureus is a major nosocomial pathogen that is associated with high virulence and the rapid development of drug resistance. METHODS We analyzed and compared the antimicrobial resistance, virulence profiles, and molecular epidemiology of 67 S. aureus strains, including 36 methicillin-sensitive (MSSA) and 31 methicillin-resistant (MRSA) strains recovered from a public hospital located in south-eastern Brazil. RESULTS The clones circulating in this hospital presented a great diversity, and the majority of the strains were related to clones responsible for causing worldwide epidemics: these included USA100 (New York/Japan clone), USA300, and USA600. The 31 MRSA (22 SCCmecII and 9 SCCmecIV) and 36 MSSA strains exhibited low resistance against gentamicin and trimethoprim/sulfamethoxazole. No MRSA strain showed resistance to tetracycline. Virulence gene carriage was more diverse and abundant in MSSA than in MRSA. Of the evaluated adhesion-related genes, ebpS was the most prevalent in both MSSA and MRSA strains. The genes bbp and cna showed a strong association with MSSA strains. CONCLUSIONS Our findings reinforce the idea that MSSA and MRSA strains should be carefully monitored, owing to their high pathogenic potential.
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Affiliation(s)
- Lais de Lima Bride
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - Monalessa Fábia Pereira
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - Maralisi Coutinho Barbosa
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - Nayara Carvalho Silva
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | | | - Thiago César Nascimento
- Departamento de Enfermagem Básica, Escola de Enfermagem, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brasil
| | - Ricardo Pinto Schuenck
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
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Pereira MF, Rossi CC, Seide LE, Martins Filho S, Dolinski CDM, Bazzolli DMS. Antimicrobial resistance, biofilm formation and virulence reveal Actinobacillus pleuropneumoniae strains' pathogenicity complexity. Res Vet Sci 2018; 118:498-501. [DOI: 10.1016/j.rvsc.2018.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 05/02/2018] [Accepted: 05/06/2018] [Indexed: 01/11/2023]
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Arteaga Blanco LA, Crispim JS, Fernandes KM, de Oliveira LL, Pereira MF, Bazzolli DMS, Martins GF. Differential cellular immune response of Galleria mellonella to Actinobacillus pleuropneumoniae. Cell Tissue Res 2017; 370:153-168. [DOI: 10.1007/s00441-017-2653-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 05/30/2017] [Indexed: 11/25/2022]
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21
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Teles P, Nikodemová D, Bakhanova E, Becker F, Kneževic Ž, Pereira MF, Sarmento S. A Review of Radiation Protection Requirements and Dose Estimation for Staff and Patients in CT Fluoroscopy. Radiat Prot Dosimetry 2017; 174:518-534. [PMID: 27522054 DOI: 10.1093/rpd/ncw231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/06/2016] [Indexed: 06/06/2023]
Abstract
The combination of fluoroscopically guided interventional procedures with computed tomography (CTF) has become widespread around the world. The benefits of CTF include the ability to obtain a real-time visualization of the entire body, increased target accuracy and improved visualization of biopsy needles. Modern CTF units work with variable frame rates for image selection, and therefore the dose distributions for patients and staff can considerably vary, creating growing concern in terms of the occupational exposure of interventionists and the drawback of a higher exposure of the patient. A literature review of the latest CTF publications is summarized in this article. A wide range of CTF studies reveal different treatment methods used in clinical practice, and therefore the differences in the exposures between them; as well as in the radiation protection tools and dose monitoring. Further optimization of radiation protection methods, harmonization of exposure patterns as well as training and education of CTF staff on the basis of the information in the survey, are strongly recommended.
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Affiliation(s)
- P Teles
- Grupo de Proteção e Segurança Radiológica, Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Pólo de Loures. Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS, Portugal
| | - D Nikodemová
- Slovak Medical University, Limbová 14, 83301 Bratislava, Slovakia
| | - E Bakhanova
- National Research Center for Radiation Medicine, NAMS Ukraine, Melnikova 53, Kiev 04050, Ukraine
| | - F Becker
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Ž Kneževic
- Ruder Boškovic Institute, Bijenicka 54, 10000 Zagreb, Croatia
| | - M F Pereira
- Grupo de Proteção e Segurança Radiológica, Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Pólo de Loures. Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS, Portugal
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico, Universidade de Lisboa, Pólo de Loures. Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS, Portugal
| | - S Sarmento
- Medical Physics, Radiobiology and Radiation Protection Group, IPO Porto Research Center (CI-IPOP), Portuguese Oncology Institute of Porto (IPO Porto), Porto, Portugal
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22
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Pereira MF, Pereira J, Rangel S, Saraiva M, Santos LM, Cardoso JV, Alves JG. ENVIRONMENTAL MONITORING WITH PASSIVE DETECTORS AT CTN IN PORTUGAL. Radiat Prot Dosimetry 2016; 170:342-345. [PMID: 26598737 DOI: 10.1093/rpd/ncv479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of this work is to present the methods in use for environmental dose assessment with passive detectors at Campus Tecnológico e Nuclear (CTN) of Instituto Superior Técnico, in Portugal. The methods are based on LiF:Mg,Ti (TLD-100) detectors inserted in Harshaw holders placed at four locations and exchanged on a quarterly basis. An initial group of measurements allowed the estimation of the time interval necessary to attain a stable value, the determination of a fading factor, as well as the calculation method for the assessment of the ambient dose equivalent rate.
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Affiliation(s)
- M F Pereira
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - J Pereira
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - S Rangel
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - M Saraiva
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - L M Santos
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - J V Cardoso
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
| | - J G Alves
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal
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Pereira J, Pereira MF, Rangel S, Saraiva M, Santos LM, Cardoso JV, Alves JG. FADING EFFECT OF LiF:Mg,Ti AND LiF:Mg,Cu,P Ext-Rad AND WHOLE-BODY DETECTORS. Radiat Prot Dosimetry 2016; 170:177-180. [PMID: 26503857 DOI: 10.1093/rpd/ncv445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Thermoluminescence dosemeters are widely used in individual and environmental monitoring. The aim of this work was to compare the thermal stability of dosemeters of the Ext-Rad and whole-body card types with LiF:Mg,Ti and LiF:Mg,Cu,P detectors stored at different temperatures and periods. The dosemeters were stored at 0°C, room temperature and 40°C for periods that lasted 8, 30, 45, 90 and 120 d. In general, TLD-100H detectors present higher TL signal stability than TLD-100 detectors. The intensity of the signal remained constant for both materials for storage periods at 0°C. At RT the same results was observed for TLD-100H. For TLD-100 detectors, a maximum variation of 22 % was registered for the longest period. At 40°C the TL signal decreased with storage time for both detectors. The TL signal of TLD-100H detectors presented maximum variations of 12 % whereas for TLD-100 detectors, larger variations of 25 % were observed.
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Affiliation(s)
- J Pereira
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - M F Pereira
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - S Rangel
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - M Saraiva
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - L M Santos
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - J V Cardoso
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
| | - J G Alves
- Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal
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Fartaria MJ, Reis C, Pereira J, Pereira MF, Cardoso JV, Santos LM, Oliveira C, Holovey V, Pascoal A, Alves JG. Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu TL detectors in mammography radiation fields. Phys Med Biol 2016; 61:6384-99. [DOI: 10.1088/0031-9155/61/17/6384] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Pereira MF, Rossi CC, Vieira de Queiroz M, Martins GF, Isaac C, Bossé JT, Li Y, Wren BW, Terra VS, Cuccui J, Langford PR, Bazzolli DMS. Galleria mellonella is an effective model to study Actinobacillus pleuropneumoniae infection. Microbiology (Reading) 2014; 161:387-400. [PMID: 25414045 DOI: 10.1099/mic.0.083923-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Actinobacillus pleuropneumoniae is responsible for swine pleuropneumonia, a respiratory disease that causes significant global economic loss. Its virulence depends on many factors, such as capsular polysaccharides, RTX toxins and iron-acquisition systems. Analysis of virulence may require easy-to-use models that approximate mammalian infection and avoid ethical issues. Here, we investigate the potential use of the wax moth Galleria mellonella as an informative model for A. pleuropneumoniae infection. Genotypically distinct A. pleuropneumoniae clinical isolates were able to kill larvae at 37 °C but had different LD50 values, ranging from 10(4) to 10(7) c.f.u. per larva. The most virulent isolate (1022) was able to persist and replicate within the insect, while the least virulent (780) was rapidly cleared. We observed a decrease in haemocyte concentration, aggregation and DNA damage post-infection with isolate 1022. Melanization points around bacterial cells were observed in the fat body and pericardial tissues of infected G. mellonella, indicating vigorous cell and humoral immune responses close to the larval dorsal vessel. As found in pigs, an A. pleuropneumoniae hfq mutant was significantly attenuated for infection in the G. mellonella model. Additionally, the model could be used to assess the effectiveness of several antimicrobial agents against A. pleuropneumoniae in vivo. G. mellonella is a suitable inexpensive alternative infection model that can be used to study the virulence of A. pleuropneumoniae, as well as assess the effectiveness of antimicrobial agents against this pathogen.
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Affiliation(s)
- Monalessa Fábia Pereira
- Laboratório de Genética Molecular de Micro-organismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Ciro César Rossi
- Laboratório de Genética Molecular de Micro-organismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Marisa Vieira de Queiroz
- Laboratório de Genética Molecular de Micro-organismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Gustavo Ferreira Martins
- Laboratório de Biologia Molecular de Insetos, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Clement Isaac
- Department of Zoology, Ambrose Alli University, Akpoma, Nigeria.,Laboratório de Biologia Molecular de Insetos, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Janine T Bossé
- Section of Paediatrics, Imperial College London, London, UK
| | - Yanwen Li
- Section of Paediatrics, Imperial College London, London, UK
| | - Brendan W Wren
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK
| | - Vanessa Sofia Terra
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK
| | - Jon Cuccui
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK
| | | | - Denise Mara Soares Bazzolli
- Laboratório de Genética Molecular de Micro-organismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
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Abstract
The strong coupling of THz radiation and material excitations can improve the quantum efficiency of THz emitters. In this paper, we investigate THz polaritons and antipolaritons based on valence band transitions, which allow TE coupling in a simple configuration. The approach can improve the quantum efficiency of THz based devices based on TE mode in the strong coupling regime of THz radiations and intervalence bands transitions in a GaAs/AlGaAs quantum wells. A Nonequilibrium Many Body Approach for the optical response beyond the Hartree-Fock approximation is used as input to the effective dielectric function formalism for the polariton/antipolariton problem. The energy dispersion relations in the THz range are obtained by adjusting the full numerical solutions to simple analytical expressions, which can be used for non specialists in a wide number of new structures and material systems. The combination of manybody and nonparabolicity at high densities leads to dramatic changes in the polariton spectra in a nonequilibrium configuration, which is only possible for intervalence band transitions.
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Pereira MF, de Araújo dos Santos CM, de Araújo EF, de Queiroz MV, Bazzolli DMS. Beginning to understand the role of sugar carriers in Colletotrichum lindemuthianum: the function of the gene mfs1. J Microbiol 2013; 51:70-81. [DOI: 10.1007/s12275-013-2393-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022]
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Pereira MF, Alves JG, Sarmento S, Santos JAM, Sousa MJ, Gouvêa M, Oliveira AD, Cardoso JV, Santos LM. Preliminary assessment of the dose to the interventional radiologist in fluoro-CT-guided procedures. Radiat Prot Dosimetry 2011; 144:448-452. [PMID: 21112883 DOI: 10.1093/rpd/ncq418] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A preliminary assessment of the occupational dose to the intervention radiologist received in fluoroscopy computerised tomography (CT) used to guide the collection of lung and bone biopsies is presented. The main aim of this work was to evaluate the capability of the reading system as well as of the available whole-body (WB) and extremity dosemeters used in routine monthly monitoring periods to measure per procedure dose values. The intervention radiologist was allocated 10 WB detectors (LiF: Mg, Ti, TLD-100) placed at chest and abdomen levels above and below the lead apron, and at both right and left arms, knees and feet. A special glove was developed with casings for the insertion of 11 extremity detectors (LiF:Mg, Cu, P, TLD-100H) for the identification of the most highly exposed fingers. The H(p)(10) dose values received above the lead apron (ranged 0.20-0.02 mSv) depend mainly on the duration of the examination and on the placement of physician relative to the beam, while values below the apron are relatively low. The left arm seems to receive a higher dose value. H(p)(0.07) values to the hand (ranged 36.30-0.06 mSv) show that the index, middle and ring fingers are the most highly exposed. In this study, the wrist dose was negligible compared with the finger dose. These results are preliminary and further studies are needed to better characterise the dose assessment in CT fluoroscopy.
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Affiliation(s)
- M F Pereira
- Instituto Tecnológico e Nuclear, Unidade de Protecção e Segurança Radiológica, EN10, 2686-953 Sacavém, Portugal.
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Freire LC, Pereira MF, Calado AM, Santos LM, Cardoso JV, Alves JG. Evaluation of the performance of two LiF:Mg,Ti and LiF:Mg,Cu,P dosemeters for extremity monitoring. Radiat Prot Dosimetry 2011; 144:140-143. [PMID: 21081520 DOI: 10.1093/rpd/ncq366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this paper, the results aimed at assessing the performance of two varieties of LiF detectors (LiF:Mg,Ti and LiF:Mg,Cu,P) in photon fields relatively to reproducibility, detection threshold and angular dependence as defined in the ISO 12794 standard are presented. The fading properties and the limit of detection were also investigated for both materials. The results suggest that both LiF varieties are well suited for extremity monitoring. However, better fading properties of LiF:Mg,Cu,P when compared with LiF:Mg,Ti, combined with previous results relatively to energy dependence suggests that LiF:Mg,Cu,P dosemeters are better suited for extremity monitoring.
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Affiliation(s)
- L C Freire
- Instituto Tecnológico e Nuclear, Unidade de Protecção e Segurança Radiológica, Estrada Nacional 10, 2686-953 Sacavém, Portugal
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Moraes EPBX, Freitas AC, Gomes-Filho MA, Guerra MMP, Silva MAR, Pereira MF, Braga VA, Mota RA. Characterization of reproductive disorders in ewes given an intrauterine dose of Toxoplasma gondii tachyzoites during the intrauterine insemination. Anim Reprod Sci 2010; 122:36-41. [PMID: 20678873 DOI: 10.1016/j.anireprosci.2010.07.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 06/11/2010] [Accepted: 07/05/2010] [Indexed: 11/25/2022]
Abstract
The aim of this study was to characterize the reproductive disorders in the acute and chronic phases in ewes experimentally infected with different doses of Toxoplasma gondii during artificial insemination occurred. Animals (n=41) were divided into three experimental groups: in the group 1 (G1, n=15), animals were inseminated using contaminated semen containing 6.5×10⁴ tachyzoites; in the group 2 (G2, n=15), animals were inseminated with contaminated semen containing 4×10⁷ tachyzoites and in the group 3 (G3, n=11), animals were inseminated using tachyzoite-free semen, serving as control group. Parasitemia and seroconversion were observed in 28 of 30 and 20 of 30, respectively, from the seventh day after infection. Embryonic reabsorption was observed in the acute phase in ewes from G1 and G2. Persistent anestrus, hydrometra, mucometra and follicular cysts were observed in the second phase of the experiment in animals from G1 and G2. Histopathological lesions similar to those of toxoplasmosis were found in the placentas. In conclusion, artificial insemination using semen containing experimentally added tachyzoites can establish toxoplasmosis in ewes and cause reproductive pathologies during the acute and chronic phases of the disease.
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Affiliation(s)
- E P B X Moraes
- Department of Veterinary Medicine, Rural Federal University of Pernambuco, Recife, PE, Brazil
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Brandao FM, Azenha A, Barros MA, Bordalo O, Correia T, Faria A, Gonçalo M, Morais O, Pereira MF, Silva R. FS01.2
Contact dermatitis to disperse blue 106 in Portugal. Contact Dermatitis 2008. [DOI: 10.1111/j.0105-1873.2004.0309l.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Santos P, Santos R, Pereira MF. P18
Allergic contact dermatitis to cosmetics: a retrospective six year review. Contact Dermatitis 2008. [DOI: 10.1111/j.0105-1873.2004.00309ez.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Köfalvi A, Pereira MF, Rebola N, Rodrigues RJ, Oliveira CR, Cunha RA. Anandamide and NADA bi-directionally modulate presynaptic Ca2+ levels and transmitter release in the hippocampus. Br J Pharmacol 2007; 151:551-63. [PMID: 17435795 PMCID: PMC2013959 DOI: 10.1038/sj.bjp.0707252] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Inhibitory CB(1) cannabinoid receptors and excitatory TRPV(1) vanilloid receptors are abundant in the hippocampus. We tested if two known hybrid endocannabinoid/endovanilloid substances, N-arachidonoyl-dopamine (NADA) and anandamide (AEA), presynapticaly increased or decreased intracellular calcium level ([Ca(2+)](i)) and GABA and glutamate release in the hippocampus. EXPERIMENTAL APPROACH Resting and K(+)-evoked levels of [Ca(2+)](i) and the release of [(3)H]GABA and [(3)H]glutamate were measured in rat hippocampal nerve terminals. KEY RESULTS NADA and AEA per se triggered a rise of [Ca(2+)](i) and the release of both transmitters in a concentration- and external Ca(2+)-dependent fashion, but independently of TRPV(1), CB(1), CB(2), or dopamine receptors, arachidonate-regulated Ca(2+)-currents, intracellular Ca(2+) stores, and fatty acid metabolism. AEA was recently reported to block TASK-3 potassium channels thereby depolarizing membranes. Common inhibitors of TASK-3, Zn(2+), Ruthenium Red, and low pH mimicked the excitatory effects of AEA and NADA, suggesting that their effects on [Ca(2+)](i) and transmitter levels may be attributable to membrane depolarization upon TASK-3 blockade. The K(+)-evoked Ca(2+) entry and Ca(2+)-dependent transmitter release were inhibited by nanomolar concentrations of the CB(1) receptor agonist WIN55212-2; this action was sensitive to the selective CB(1) receptor antagonist AM251. However, in the low micromolar range, WIN55212-2, NADA and AEA inhibited the K(+)-evoked Ca(2+) entry and transmitter release independently of CB(1) receptors, possibly through direct Ca(2+) channel blockade. CONCLUSIONS AND IMPLICATIONS We report here for hybrid endocannabinoid/endovanilloid ligands novel dual functions which were qualitatively similar to activation of CB(1) or TRPV(1) receptors, but were mediated through interactions with different targets.
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Affiliation(s)
- A Köfalvi
- Center for Neurosciences of Coimbra, University of Coimbra, Coimbra, Portugal.
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Martín-Casabona N, Bahrmand AR, Bennedsen J, Thomsen VO, Curcio M, Fauville-Dufaux M, Feldman K, Havelkova M, Katila ML, Köksalan K, Pereira MF, Rodrigues F, Pfyffer GE, Portaels F, Urgell JR, Rüsch-Gerdes S, Tortoli E, Vincent V, Watt B. Non-tuberculous mycobacteria: patterns of isolation. A multi-country retrospective survey. Int J Tuberc Lung Dis 2004; 8:1186-93. [PMID: 15527150] [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: 05/01/2023] Open
Abstract
OBJECTIVE To collect data on non-tuberculous mycobacteria (NTM) isolated from clinical laboratories in different countries to establish: 1) whether the isolation of NTM was increasing, 2) which species were increasing, and 3) whether there was any pattern of geographical distribution. DESIGN In 1996, the Working Group of the Bacteriology and Immunology Section of the International Union Against Tuberculosis and Lung Disease contacted 50 laboratories in different countries for the necessary information. RESULTS The number of patients reported with NTM was 36099 from 14 countries. Mycobacterium avium complex, M. gordonae, M. xenopi, M. kansasii and M. fortuitum were the five species most frequently isolated. There was a significant upward trend for M. avium complex and M. xenopi. Pigmented mycobacteria predominated in Belgium, the Czech Republic and the Mediterranean coast of Spain. Non-chromogenic mycobacteria were found to be predominant in the area of the Atlantic coast of Brazil and in Turkey, the United Kingdom, Finland and Denmark. CONCLUSIONS There was an increase in the number of NTM isolated from clinical samples of patients. Isolation of the most frequent species is constantly changing in most of the geographical areas, and newer species are emerging due to better diagnostic techniques to detect and identify NTM.
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Affiliation(s)
- N Martín-Casabona
- Servicio de Microbiologia, Hospital Universitario Vail d'Hebron, Barcelona, Spain.
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Pereira MF, Hernández MD, Pintor J, Miras-Portugal MT, Cunha RA, Ribeiro JA. Diadenosine polyphosphates facilitate the evoked release of acetylcholine from rat hippocampal nerve terminals. Brain Res 2000; 879:50-4. [PMID: 11011005 DOI: 10.1016/s0006-8993(00)02726-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Diadenosine polyphosphates are present in synaptic vesicles, are released upon nerve stimulation and possess membrane receptors, namely in presynaptic terminals. However, the role of diadenosine polyphosphates to control neurotransmitter release in the CNS is not known. We now show that diadenosine pentaphosphate (Ap(5)A, 3-100 microM) facilitated in a concentration dependent manner the evoked release of acetylcholine from hippocampal nerve terminals, with a maximal facilitatory effect of 116% obtained with 30 microM Ap(5)A. The selective diadenosine polyphosphate receptor antagonist, diinosine pentaphosphate (Ip(5)I, 1 microM), inhibited by 75% the facilitatory effect of Ap(5)A (30 microM), whereas the P(2) receptor antagonists, suramin (100 microM) and pyridoxal-phosphate-6-azophenyl-2',4'-disulfonic acid (PPADS, 10 microM) only caused a 18-24% inhibition, the adenosine A(1) receptor antagonist, 1,3-dipropyl-8-cyclopentylxanthine (20 nM), caused a 36% inhibition and the adenosine A(2A) receptor antagonist, 4-(2-[7-amino-2-(2-furyl)[1,2,4]triazolo [2,3-a][1,3, 5]triazin-5-ylamino]ethyl)phenol (ZM 241385, 20 nM), was devoid of effect. These results show that diadenosine polyphosphates act as neuromodulators in the CNS, facilitating the evoked release of acetylcholine mainly through activation of diadenosine polyphosphate receptors.
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Affiliation(s)
- M F Pereira
- Laboratory of Neurosciences, Faculty of Medicine, University of Lisbon, 1649-028, Lisbon, Portugal
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Abstract
Neuromuscular transmission is decreased in aged subject. Since endogenous adenosine is a potent neuromodulator at motor nerve endings, either inhibiting via A(1) receptors or facilitating via A(2A) receptors acetylcholine release, we now investigated if the tonic effect of endogenous adenosine was modified at phrenic nerve endings of aged rats. The A(2A) receptor antagonist (ZM241385, 50 nM) inhibited (77 +/- 9%) and the A(1) receptor antagonist (DPCPX, 50 nM) facilitated (74 +/- 13%) acetylcholine release from young adult (6 weeks old) rat preparations, indicating a simultaneous tonic activation of A(2A) and A(1) receptors. Tonic modulation by adenosine was unaltered in aged (24 months old) rats, since ZM241385 (50 nM) inhibited (73 +/- 8%) and DPCPX (50 nM) facilitated (91 +/- 20%) acetylcholine release in aged animals similarly to young rats. This indicates that, in contrast to the central nervous system where adenosine neuromodulation is modified in aged animals, the control by adenosine of phrenic nerve function is preserved in aged animals.
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Affiliation(s)
- M F Pereira
- Laboratory of Neurosciences, Faculty of Medicine, University of Lisbon, Av. Prof. Egas Moniz, Lisbon, Portugal
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Antunes ML, Aleixo-Dias J, Antunes AF, Pereira MF, Raymundo E, Rodrigues MF. Anti-tuberculosis drug resistance in Portugal. Int J Tuberc Lung Dis 2000; 4:223-31. [PMID: 10751067] [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: 02/16/2023] Open
Abstract
SETTING A survey based upon a representative sample of smear-positive pulmonary tuberculosis patients was undertaken in Portugal, as part of the World Health Organization's Global Project on Anti-Tuberculosis Drug Resistance Surveillance. OBJECTIVE To determine the level of primary antituberculosis drug resistance at both national and regional levels, and to assess its relative weight within the performance of the National Tuberculosis Programme (NTP). DESIGN Mycobacterium tuberculosis isolates from 1,105 patients with smear-positive pulmonary tuberculosis admitted to 46 randomly stratified treatment centres all over mainland Portugal were submitted to susceptibility testing with four drugs. Human immunodeficiency virus (HIV) testing was included in the patients' evaluation scheme. RESULTS Of the strains isolated, 197 (17.8%) were resistant to at least one drug. Primary resistance to isoniazid was 7.7% and to rifampicin 1.9%. Acquired drug resistance was 39.2% in total, any acquired resistance to isoniazid 31.1% and to rifampicin 20.9%. Primary multidrug resistance (MDR) was 1.8% and acquired MDR was 20.9%. HIV testing was positive in 29.2% of MDR-TB cases. CONCLUSIONS Drug resistance in Portugal is high. Primary MDR and particularly acquired MDR occur in a high proportion of cases, indicating a need for improvement in NTP performance.
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Sarmento e Castro RS, Vasconcelos O, Horta AA, Rodrigues F, Pereira MF, Rocha-Marques A. [Atypical mycobacteria infections]. ACTA MEDICA PORT 1999; 12:371-9. [PMID: 10892440] [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: 02/17/2023]
Abstract
The isolation of nontuberculous mycobacteria was considered for many years as a result of contamination or transient colonization. The role of these bacteria in human disease was recognized only after 1950. They were present almost exclusively in patients with underlying pulmonary pathology and were rare. The prevalence of disease caused by nontuberculous mycobacteria was dramatically increased with the AIDS epidemic. Disseminated infection with MAC and other atypical mycobacteria is nowadays a frequent complication of AIDS. The authors describe some epidemiological and clinical features of these nontuberculous mycobacteria emphasizing the role of MAC and make some considerations about the diagnosis, prophylaxis and treatment of these diseases. The authors end by presenting their own clinical experience.
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Freire MC, Pereira MF, Batista SM, Borges MD, Barbosa MI, Rosa AG. [Prevalence of dental caries and treatment needs in 6 to 12 year-old schoolchildren at public schools]. Rev Saude Publica 1999; 33:385-90. [PMID: 10542473 DOI: 10.1590/s0034-89101999000400010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE To assess dental caries prevalence and treatment needs of schoolchildren in the State of Goiás, Brazil. METHODS The study population consisted of 6-12-yr-old schoolchildren (n=1,419), male and female, attending 25 public schools located in the urban area of 9 provincial cities in the State of Goiás. RESULTS Percentage of caries-free schoolchildren was very low at all ages (4.4% at age 12). Mean DMF-T ranged from 0.41 at age 6 to 5.19 at age 12. Mean dmf-t in this age group ranged from 4.93 to 0.29. Treatment needs were higher than the proportion of treated teeth in both deciduous and permanent dentition. CONCLUSION The high prevalence of dental caries found in schoolchildren in the provincial cities of Goiás suggests the need for oral health education and preventive programs targeted at the underlying causes of the disease on a population level.
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Affiliation(s)
- M C Freire
- Departamento de Ciências Estomatológicas da Faculdade de Odontologia, Universidade Federal de Goiás, Goiânia, GO, Brasil.
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Pereira MF, Novello JC, Cintra AC, Giglio JR, Landucci ET, Oliveira B, Marangoni S. The amino acid sequence of bothropstoxin-II, an Asp-49 myotoxin from Bothrops jararacussu (Jararacucu) venom with low phospholipase A2 activity. J Protein Chem 1998; 17:381-6. [PMID: 9619591 DOI: 10.1023/a:1022563401413] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [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
The complete amino acid sequence of bothropstoxin-II (BthTX-II), a myotoxin isolated from Bothrops jararacussu snake venom, is reported. The results show that BthTX-II is an Asp-49 phospholipase A2 (PLA2)-like protein composed of a single polypeptide chain of 120 amino acid residues (Mr = 13,976), containing one methionine and 14 half-cystines. Despite a high degree of homology with other PLA2's and the presence of the strategic residues known to compose the Ca2+-binding loop, namely Tyr-28, Gly-30, Gly-32, and especially Asp-49, besides His-48, Tyr-52, and Asp-99, all of them directly or indirectly involved in catalysis, BthTX-II revealed a very low PLA2 activity when assayed on egg yolk phosphatidylcholine. We attribute this low catalytic activity to the existence of extra mutations, e.g., Trp-5 for Phe-5, which points to the need of considering other strategic positions, since only Lys-49 PLA2's have been considered to be devoid of this enzymatic activity.
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Affiliation(s)
- M F Pereira
- Department of Biochemistry, Institute of Biology, UNICAMP, Campinas-SP, Brazil
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Landucci EC, Castro RC, Pereira MF, Cintra AC, Giglio JR, Marangoni S, Oliveira B, Cirino G, Antunes E, De Nucci G. Mast cell degranulation induced by two phospholipase A2 homologues: dissociation between enzymatic and biological activities. Eur J Pharmacol 1998; 343:257-63. [PMID: 9570475 DOI: 10.1016/s0014-2999(97)01546-x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Bothropstoxin-I and bothropstoxin-II are phospholipase A2 homologues isolated from Bothrops jararacussu snake venom. The former is devoid of phospholipase A2 activity whereas the latter has very low enzymatic activity. In this study, we have investigated the in vivo (rat paw and skin oedema) and in vitro (mast cell degranulation) inflammatory effects caused by bothropstoxin-I and bothropstoxin-II. Bothropstoxin-I (25-100 microg/paw) and bothropstoxin-II (12.5-50 microg/paw) caused dose-dependent rat paw oedema. The intradermal injection of bothropstoxin-I (0.125-5 microg/site) and bothropstoxin-II (0.125-5 microg/site) into rat skin also resulted in dose-dependent oedema formation. These oedematogenic activities were largely reduced in animals pretreated with the histamine/5-hydroxytryptamine (5-HT) receptor antagonist cyproheptadine (2 mg/kg, i.p. 0.5 h before). Similarly, p-bromophenacyl bromide, a compound known to inhibit phospholipase A2 activity, significantly inhibited rat paw and skin oedema induced by both phospholipase A2 homologues. The polyanion heparin (5 IU/site) significantly reduced the rat skin oedema induced by either bothropstoxin-I or bothropstoxin-II as well as the paw oedema (50 IU/site) induced by the former. When assayed in the rat peritoneal mast cells in vitro, both bothropstoxin-I (10 and 100 microg/ml) and bothropstoxin-II (3 and 10 microg/ml) significantly caused [14C]5-HT release. The [14C]5-HT release caused by these phospholipase A2 homologues were reduced by p-bromophenacyl bromide and heparin (50 IU/ml). Our results indicate that oedema formation induced by bothropstoxin-I and bothropstoxin-II is mostly dependent on in vivo mast cell degranulation. Since heparin greatly reduced the oedematogenic activity of these phospholipase A2 homologues, it is likely that the cationic charge of these substances plays a major role in the mast cell activation. Our results also indicate that p-bromophenacyl bromide may not be a suitable pharmacological tool to investigate the correlation between enzymatic activity and the inflammatory effects of phospholipases A2.
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Affiliation(s)
- E C Landucci
- Department of Pharmacology, Faculty of Medical Sciences, UNICAMP, Campinas (SP), Brazil.
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Freire MDC, Pereira MF, Batista SM, Borges MDR, Barbosa MI, Rosa GF. [The prevalence of dental caries and necessary treatment in six to twelve year old schoolchildren in Goiânia, GO, Brazil, 1994]. Rev Saude Publica 1997; 31:44-52. [PMID: 9430925 DOI: 10.1590/s0034-89101997000100007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVE The prevalence of dental caries and needs of treatment among schoolchildren in Goiânia-GO, middle-west of Brazil was assessed. METHODOLOGY The study population consisted of 6-12-yr-old schoolchildren (n = 1,400) attending public schools located in the urban area of the city, where the water-supply had been fluoridated for 9 years. RESULTS Mean dmf-t and DMF-T for the total sample were 2.19 and 2.86, respectively, showing a reduction of 57.1% in the DMF-T as compared to the regional data from the national survey carried out in 1986. At age 12 DMF-T was 4.59, which is above the acceptable level according to the FDI/WHO goal for the year 2000. Percentage of caries-free schoolchildren was very low at all ages (11% of the total sample). The most significant need was for restorative treatment in the treatment deciduous dentition at all ages and in the permanent dentition from age 9. CONCLUSION It was concluded that the prevalence of dental caries among schoolchildren in Goiânia-GO is high, comparable to the situation in most Latin American countries and poor regions of developed countries. The results indicate the need for oral health education and preventive programs targeted at the underlying causes of the disease, in the population.
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Affiliation(s)
- M do C Freire
- Departamento de Odontologia Social, Faculdade de Odontologia, Universidade Federal de Goiás. Goiânia, Brasil.
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Pereira MF, Henneberger K. Green's functions theory for semiconductor-quantum-well laser spectra. Phys Rev B Condens Matter 1996; 53:16485-16496. [PMID: 9983491 DOI: 10.1103/physrevb.53.16485] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Farias ML, Delgado AG, Rosenthal D, Vieira JG, Kasamatsu T, Lazarevitch MJ, Pereira MF, Lima MB. The cause of maintained hypercalciuria after the surgical cure of primary hyperparathyroidism is a defect in renal calcium reabsorption. J Endocrinol Invest 1996; 19:12-20. [PMID: 8851686 DOI: 10.1007/bf03347852] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The hypercalciuria that eventually remains after the successful removal of a solitary parathyroid adenoma may originate from excessive intestinal calcium absorption, bone resorption or deficient renal reabsorption. In order to clarify this question, ten patients surgically cured from primary hyperparathyroidism (PHPx), ten age-matched normal subjects and five nephrolithiasic patients with renal hypercalciuria (RH) were studied after five days on a low calcium diet, either during fasting or after oral calcium load. Fasting serum calcium, amino-terminal and intact PTH levels and also urinary cAMP excretion were normal in every individual patient. Serum ionized calcium and inulin clearance (GFR) were used for calculations of the filtered load (FL Ca) and the fractional excretion of calcium (FE Ca). Six PHPx patients displayed fasting calciuria above the upper limit calculated for control subjects, despite having the lowest GFR and FL Ca (p < 0.05 vs control). These patients (h-PHPx) had a small calciuric response to oral calcium load. Serum 1,25-(OH)2D3 and 25OHD3 did not correlate with calciuria. Our findings exclude intestinal hyperabsorption and excessive bone resorption in h-PHPx patients, and strongly suggest a renal tubular defect in calcium reabsorption as the cause of their hypercalciuria. This defect could be primary, as in RH, but only three hPHPx patients had recurrent kidney stones before surgery. On the other hand, as a negative correlation between GFR and FE Ca was only found in PHPx patients, it seems probable that the disturbances in glomerular and tubular functions were secondary to the long standing hypercalcemic hyperparathyroidism.
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Affiliation(s)
- M L Farias
- Division of Endocrinology, HUCFF, Federal University of Rio de Janeiro, Brazil
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Pereira MF. Analytical solutions for the optical absorption of semiconductor superlattices. Phys Rev B Condens Matter 1995; 52:1978-1983. [PMID: 9981266 DOI: 10.1103/physrevb.52.1978] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Pereira MF, Galbraith I, Koch SW, Duggan G. Exciton binding energies in semiconductor superlattices: An anisotropic-effective-medium approach. Phys Rev B Condens Matter 1990; 42:7084-7089. [PMID: 9994834 DOI: 10.1103/physrevb.42.7084] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Luz JG, Seroli W, Yamamoto MK, Pereira MF. [Temporomandibular injury: a cause of limited mouth opening]. Rev Odontol Univ Sao Paulo 1990; 4:172-4. [PMID: 2135352] [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: 12/30/2022]
Abstract
A case of limitation of jaw opening caused by an intentional knife wound to the temporomandibular region is presented. The chief complaint was pain and restricted jaw movement. Treatment consisted of the administration of antiinflammatory agent. Recovery was complete and without complications, normal jaw opening being obtained. The possibility that the inflammatory process stimulates muscular spasm is emphasized.
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Affiliation(s)
- J G Luz
- Departamento de Cirurgia, Prótese e Traumatologia Maxilo-Faciais da Faculdade de Odontologia da Universidade de São Paulo
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Durán N, Campos V, Riveros R, Joyas A, Pereira MF, Haun M. Bacterial chemistry-III: preliminary studies on trypanosomal activities of Chromobacterium violaceum products. AN ACAD BRAS CIENC 1989; 61:31-6. [PMID: 2512826] [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: 01/01/2023] Open
Abstract
It has been found that the pigment-I from Chromobacterium violaceum, 3-[1,2-dihydro5-(5-hydroxy-1H-indol-3-yl)-2-oxo-3H-pyrrol-3-yli diene] 1,3-dihydro-2H-indol-2-one, has trypanocide activity. The formylated derivatives, pigment-III, immobilized 100% of the Trypanosoma cruzi at a level of 46 microM after 48 h of interaction with a total growth inhibition in the same period. Pigment-I exhibited low toxicity and a DNA synthesis inhibition similar to that of Nifurtimox, a known trypanocide compound.
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Affiliation(s)
- N Durán
- Biological Chemistry Laboratory, Universidade Estadual de Campinas, SP, Brazil
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Bonhorst DH, Gracias R, Carvalho MG, Andrade ML, Tavares MA, Pereira MF, Bento R, Lima R, Halpern MJ, Macedo MM. [Specificity of creatine kinase isoenzyme MB in cardiac surgery with extracorporeal circulation (during the pre intra and postoperative periods)]. ACTA MEDICA PORT 1979; 1:3-14. [PMID: 549461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Pereira MF. [Occupational cancerology]. Hospital (Rio J) 1969; 75:885-95. [PMID: 5306255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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