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Thaumaturgo N, Souza CRF, Fialho TJNA, Liarth RS, Oliveira AP, Guimarães D, Felix VS, Pimenta AR, Oliveira ALC, Oliveira MB, Oliveira MA, Ferreira DSR, Freitas RP. Analysis of brazilian paintings of the 20th century: Suspects and authentics through in situ and Non-Invasive techniques. Spectrochim Acta A Mol Biomol Spectrosc 2024; 304:123431. [PMID: 37748336 DOI: 10.1016/j.saa.2023.123431] [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] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/09/2023] [Accepted: 09/18/2023] [Indexed: 09/27/2023]
Abstract
This work studied suspicious and authentic artworks by Brazilian painters Ivan Serpa, Ismael Nery, and Iberê Camargo by XRF, FTIR, OM, and MA-XRF techniques. The studies made it possible to verify that all suspicious artworks are counterfeit artifacts. The analyses were conducted in situ, and different approaches were applied for data treatment. For example, principal component analysis and spectral deconvolution were performed on the XRF data. From these methods, it was possible to verify that the suspect artworks by Ivan Serpa and Iberê Camargo have different materiality than the authentic paintings. Additionally, MA-XRF images did not reveal the presence of a polychrome preparation layer in the suspicious paintings by Ivan Serpa. The suspect artworks from Ismael Nery exhibited a Ca-K/Ti-K ratio that indicates they were created on a low-quality paper support, which is not suitable for paintings. The differences in materials used in the suspicious and authentic artworks are further supported by the FTIR and OM results. In addition to the physicochemical analysis, the paintings were studies graphotechnical examinations, financial evaluations, and artistic analyses that demonstrated they were counterfeit artifacts. The results of the analysis demonstrate how physicochemical techniques can contribute to the forensic investigation of paintings. However, this work highlights the importance of applying distinct treatments to the XRF data in order to accentuate the differences between the suspect and authentic artworks.
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Affiliation(s)
- N Thaumaturgo
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - C R F Souza
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - T J N A Fialho
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - R S Liarth
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - A P Oliveira
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil; Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - D Guimarães
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - V S Felix
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - A R Pimenta
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - A L C Oliveira
- Instituto de Criminalística Carlos Éboli, Departamento Geral de Polícia Técnico-Científica, Rio de Janeiro (RJ), Brasil
| | - M B Oliveira
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - M A Oliveira
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - D S R Ferreira
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil
| | - R P Freitas
- Laboratório de Instrumentação e Simulação Computacional, Instituto Federal do Rio de Janeiro, Campus Paracambi (RJ), Brasil.
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Oliveira MB, Silva ANS, Viana VBJ, Rotella LB, Teixeira EB, Khayat AS, Moreira FC, Amaral CEM. CORRELAÇÃO ENTRE NÚMERO DE LEUCÓCITOS E O VALOR DO CYCLE THRESHOLD (CT) EM PACIENTES DETECTÁVEIS PARA O GENE BCR-ABL EM LEUCEMIA MIELOIDE CRÔNICA (LMC) POR PCR EM TEMPO REAL. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.387] [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: 11/11/2022] Open
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Oliveira MB, Teixeira EB, Silva ANDS, Nunes CAM, Pessoa FMCP, Rodrigues TVP, Gomes JAB, Oliveira EHC, Pantoja LC, Khayat AS. ANÁLISE DE ALTERAÇÕES GENÔMICAS QUANTITATIVAS EM GENES LEITORES DA FAMÍLIA BTB-ZF EM LEUCEMIA LINFOBLÁSTICA AGUDA (LLA) PEDIÁTRICA. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.333] [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: 11/07/2022] Open
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Souza FCB, Oliveira MB, Givisiez FN, Silva RMF, Marques PLF, Junior DAJ, Pereira DAR, Antunes FG, Ribeiro MA. VALIDAÇÃO DE SISTEMA DE MONITORAMENTO REMOTO CONTÍNUO DE TEMPERATURA NA HEMOTERAPIA: DESAFIOS E SOLUÇÕES DO PROCESSO NA FUNDAÇÃO HEMOMINAS. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.883] [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: 11/11/2022] Open
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Alves MT, Silva CM, Oliveira MB, Carvalho FFC, Borborema TS, Vasconcelos MCM, Silva-Malta MCF, Vieira AK. QUADRO CLÍNICO FAVORÁVEL DE PACIENTES COM DOENÇA FALCIFORME E COVID-19: RELATOS DE CASO. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.103] [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: 11/11/2022] Open
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6
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Silva ANDS, Teixeira EB, Oliveira MB, Rotella LB, Viana VBJ, Silva MF, Gomes JAB, Wanderley AV, Oliveira EHC, Khayat AS. ANÁLISE DE ALTERAÇÕES GENÔMICAS QUANTITATIVAS EM GENES APAGADORES (KDM1B E KDM7) EM LEUCEMIA LINFOBLÁSTICA AGUDA PEDIÁTRICA. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.314] [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: 11/07/2022] Open
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7
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Silva-Malta MCF, Silva SMN, Oliveira MB, Ribeiro MA, Martins ML. QUEDA DA SOROPREVALÊNCIA DO VÍRUS LINFOTRÓPICO DE CÉLULAS T HUMANAS (HTLV) EM DOADORES DE SANGUE DE MINAS GERAIS, DURANTE UM PERÍODO DE 12 ANOS (2006–2017). Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.829] [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: 11/11/2022] Open
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Neto AI, Correia CR, Oliveira MB, Rial-Hermida MI, Alvarez-Lorenzo C, Reis RL, Mano JF. A novel hanging spherical drop system for the generation of cellular spheroids and high throughput combinatorial drug screening. Biomater Sci 2015. [PMID: 26222417 DOI: 10.1039/c4bm00411f] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We propose a novel hanging spherical drop system for anchoring arrays of droplets of cell suspension based on the use of biomimetic superhydrophobic flat substrates, with controlled positional adhesion and minimum contact with a solid substrate. By facing down the platform, it was possible to generate independent spheroid bodies in a high throughput manner, in order to mimic in vivo tumour models on the lab-on-chip scale. To validate this system for drug screening purposes, the toxicity of the anti-cancer drug doxorubicin in cell spheroids was tested and compared to cells in 2D culture. The advantages presented by this platform, such as feasibility of the system and the ability to control the size uniformity of the spheroid, emphasize its potential to be used as a new low cost toolbox for high-throughput drug screening and in cell or tissue engineering.
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Affiliation(s)
- A I Neto
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, AvePark, 4806-90 Taipas, Guimarães, Portugal
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Oliveira MB, Barbosa SC, Petrofeza S. Comparative in vitro and in planta analyses of extracellular enzymes secreted by the pathogenic fungus Sclerotinia sclerotiorum. Genet Mol Res 2013; 12:1796-807. [PMID: 23913372 DOI: 10.4238/2013.june.6.3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Dry bean (Phaseolus vulgaris L.) is an important economic crop in Brazil but its yield can be significantly reduced by white mold, a disease caused by Sclerotinia sclerotiorum (Lib.) de Bary, a necrotrophic, highly destructive, and non-host-specific fungus. This fungus secretes numerous cell wall-degrading enzymes such as polygalacturonases, exo-β-1,3-glucanases, xylanases, and cellulases that have been detected during the early stages of infection. In this study, the activities of these enzymes were detected in all carbon sources tested (citrus pectin, cell wall extract from P. vulgaris, carboxymethyl cellulose, and glucose), but the highest levels were found when using citrus pectin and cell wall extract from P. vulgaris. Regardless of the carbon source, pH decreased throughout the culture time. During pathogenesis in dry bean stems, increased enzyme activities were also observed. Reverse transcriptase-polymerase chain reaction experiments showed that the induction of polygalacturonases (sspg1, sspg3, sspg5, sspg6, and sspg7), exo-β-1,3-glucanases, and endo-β-1-4-glucanase in S. sclerotiorum occurred during the early stages of colonization.
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Affiliation(s)
- M B Oliveira
- Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
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Bueno EA, Oliveira MB, Andrade RV, Lobo M, Petrofeza S. Effect of different carbon sources on proteases secreted by the fungal pathogen Sclerotinia sclerotiorum during Phaseolus vulgaris infection. Genet Mol Res 2012; 11:2171-81. [PMID: 22782635 DOI: 10.4238/2012.june.25.3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Sclerotinia sclerotiorum (Sclerotiniaceae) is a plant pathogenic fungus that causes white mold disease in vegetable crops, including the common bean (Phaseolus vulgaris). Proteases produced by fungi are normally an important part of the pathogenic process in the host. We examined the effect of different carbon sources--pectin, glucose, and cell wall of P. vulgaris on the production of proteases in cultures of S. sclerotiorum. These proteases were also assayed in infected P. vulgaris plants. Enzyme activity was increased with all carbon sources, but the highest levels were found when pectin was added. Based on real-time quantitative reverse transcription-PCR analyses, protease induction in S. sclerotiorum was found to occur at the level of gene transcription. The finding of increased expression of acid phosphatase 1 and aspartyl protease in vivo in infected P. vulgaris plants supports the role of these enzymes in the invasion process of S. sclerotiorum.
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Affiliation(s)
- E A Bueno
- Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil
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Abstract
The narrow genetic base of soybean makes cultivar characterization based on morphological descriptors difficult; this characterization is mainly done for registration and protection. Correct characterization of cultivars could be achieved through molecular markers, since the frequencies of each allele in the population are known. Consequently, we developed a molecular characterization method and initiated the construction of a molecular database for soybean cultivar identification. Thirty-two soybean cultivars were analyzed with 48 fluorescent-labeled microsatellite markers. The reactions were carried out in singleplex, and genotyping in quadriplex, using a capillary electrophoresis system in an automated sequencer. Probabilities of random identity and probabilities of random identity exclusion were calculated through estimated allele frequencies. A characterization profile was considered when the probability of random identity exclusion was equal or superior to 99.9999%. All steps of the experiment were doubled, using two independent sets of the same cultivar to evaluate the reproducibility of the method. A set of 13 microsatellite markers identified all 32 cultivars with 99.9999% certainty. The method was efficient and precise, with high reproducibility for cultivar characterization. These data are the beginning of a molecular database for soybean, and they can be used for cultivar characterization for registration and protection purposes and for cultivar identification in cases of intellectual property enforcement.
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Affiliation(s)
- M B Oliveira
- Departamento de Biologia, Universidade Paranaense, Umuarama, PR, Brasil
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12
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Araújo FR, Melo VSP, Ramos CAN, Madruga CR, Soares CO, Kessler RH, Almeida NF, Araújo GS, Alves LC, Torres Júnior RAA, Fragoso SP, Arauco PRC, Bacanelli G, Oliveira MB, Santos LR. Development of enzyme-linked immunosorbent assays based on recombinant MSP1a and MSP2 of Anaplasma marginale. Mem Inst Oswaldo Cruz 2006; 100:765-9. [PMID: 16410967 DOI: 10.1590/s0074-02762005000700016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Indirect enzyme-linked immunosorbent assays (ELISAs) based on recombinant MSP1a and MSP2 from a Brazilian isolate of Anaplasma marginale were developed to detect antibodies against this rickettsia in cattle. The high sensitivities (99% for both tests) and specificities (100% for both tests) were confirmed with sera from cattle positive or negative for A. marginale antibodies, respectively, by immunofluorescent antibody test. By the analysis of 583 sera from cattle of three regions of the state of Pernambuco, Brazil, the agreement between both tests was high, with a kappa index of 0.89. The similar performances of the ELISAs suggest that both tests can be used in epidemiological surveys for detection of antibodies to A. marginale in cattle.
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Affiliation(s)
- Flábio R Araújo
- Embrapa Gado de Corte, Rodovia BR 262, 79002-970 Campo Grande, MS, Brazil.
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13
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Casal S, Macedo B, Oliveira MB. Simultaneous determination of retinol, beta-carotene and alpha-tocopherol in adipose tissue by high-performance liquid chromatography. J Chromatogr B Biomed Sci Appl 2001; 763:1-8. [PMID: 11710568 DOI: 10.1016/s0378-4347(01)00349-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A method is described for evaluation of fat-soluble vitamin in human adipose tissue with the aim to obtain, accurately and within the shortest analysis time, a time-integrated measure of exposure to vitamins from the diet. Fat tissue was deproteinized with ethanol and extracted with n-hexane. Normal-phase HPLC was performed in a Lichrosorb Si60 column with a gradient of n-hexane-2-propanol at 1 ml/min. Detection was accomplished using a diode-array system (for retinol and beta-carotene) in series with a fluorescence detector (alpha-tocopherol). The method was validated and applied to human adipose tissue in a total of 140 subjects. The mean contents found were 0.43, 0.84, 240.3 microg/g for retinol, beta-carotene and alpha-tocopherol, respectively. The method is sensitive enough for detecting the compounds in 1.6 mg of adipose tissue considering the lowest concentration found.
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Affiliation(s)
- S Casal
- CEQUP/Serviço de Bromatologia, Faculdade de Farmácia do Porto, Portugal.
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Stevan FR, Oliveira MB, Bucchi DF, Noseda, Iacomini M, Duarte ME. Cytotoxic effects against HeLa cells of polysaccharides from seaweeds. J Submicrosc Cytol Pathol 2001; 33:477-84. [PMID: 11989782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Polysaccharides extracted from several red and brown seaweeds growing along the South American coasts were evaluated regarding their cytotoxic effects against HeLa cells. Sulfated galactans were isolated and purified from the red algae Bostrychia montagnei (BHW and B4 fractions, 17 and 22% SO3Na, respectively) and Porphyra columbina (PC75 fraction, 15.6% SO3Na). At maximum concentration of 80 microg/mL, these fractions promoted atypical mitoses in HeLa cells, presence of atypical nuclei and blebs. Alginic acid (160.0 microg/mL) isolated from the brown seaweed Laminaria brasiliensis (molar ratio M/G 1.2) and its M and G blocks (40.0 microg/mL; DP = 20), promoted similar morphologic alterations besides the presence of acidophilic material in the cellular cytoplasm and occurrence of multinuclear cells present in the monolayer. The polysaccharide fraction SF isolated from the brown seaweed Sargassum stenophyllum containing mainly fucose and presenting molar ratio of sulfate/sugar 1.9, promoted very accentuated morphologic modifications in HeLa cells at low concentrations. SF (2.5 microg/mL) caused significant alterations in the cellular morphology and reduction of the growth, such effects being dose dependent. At 40.0 microg/mL, accentuated decrease of the number of mitosis illustrations accompanied by an increase in the number of condensed cells, atypical nuclei, number of clusters and blebs. These results demonstrated that among the anionic polysaccharides tested, the sulfated fucans were those which caused greater cytotoxic effects in HeLa cells.
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Affiliation(s)
- F R Stevan
- Department of Biochemistry, Federal University of Parana, Curitiba, PR, Brazil
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Paes MC, Oliveira MB, Oliveira PL. Hydrogen peroxide detoxification in the midgut of the blood-sucking insect, Rhodnius prolixus. Arch Insect Biochem Physiol 2001; 48:63-71. [PMID: 11568965 DOI: 10.1002/arch.1058] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Here we investigated H2O2 production and detoxification in the hematophagous hemiptera, Rhodnius prolixus. Superoxide dismutase (SOD) catalyzes the dismutation of superoxide radical (O2-). This reaction produces hydrogen peroxide, which is scavenged by antioxidant enzymes such as catalase (CAT). SOD and CAT activities were found in all tissues studied, being highest in the midgut. CAT was dose-dependently inhibited in vivo by injections of 3-amino-1,2,4-triazole (AT). Insects treated with AT showed a twofold increase in H2O2 levels. Injection of DL-buthionine-[S, R]-sulfoximine (BSO), an inhibitor of glutathione synthesis, also resulted in a fourfold increase in H2O2, together with stimulation of CAT activity. Simultaneous administration of both AT and BSO had a synergistic effect on midgut H2O2 content. Taken all together, our results suggest that CAT and glutathione-dependent mechanisms cooperate to control H2O2 concentration in the midgut cell and prevent hydroxyl radical generation by Fenton reaction in this tissue.
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Affiliation(s)
- M C Paes
- Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Ilha do Fundão, Rio de Janeiro, RJ, Brazil.
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Abstract
The effects of mycotoxin citrinin on Ca2+ efflux and membrane permeabilization were studied in isolated rat liver mitochondria. The efflux rate observed when in presence of ruthenium red was higher when citrinin was added. Swelling experiments demonstrated Ca(2+)-dependent membrane permeabilization by citrinin. Catalase, butylhydroxitoluene (BHT), and dithiothreitol (DTT) did not protect swelling caused by Ca2+ plus citrinin. The protection conferred by ATP-Mg2+ and cyclosporin A in the latter experiments are strong indications of pore formation. These results suggest that citrinin can induce permeability transition by a mechanism that does not involve oxidative damage.
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Affiliation(s)
- E J Da Lozzo
- Departamento de Bioquímica, Universidade Federal do Paraná, Curitiba, PR, Brasil
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Casal S, Oliveira MB, Alves MR, Ferreira MA. Discriminate analysis of roasted coffee varieties for trigonelline, nicotinic acid, and caffeine content. J Agric Food Chem 2000; 48:3420-3424. [PMID: 10956127 DOI: 10.1021/jf990702b] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Arabica and robusta roasted coffees from several geographical origins, in a total of 29 samples, were characterized for their contents in caffeine, trigonelline, and nicotinic acid by a recently developed HPLC/diode-array detector method. All samples were subjected to the same roasting procedure in order to eliminate the variations due to this process. Characterization was achieved by applying multivariate and nonparametric analysis to the chromatographic results. The two coffee varieties were clearly separated by their trigonelline and caffeine contents. Nicotinic acid could not be used as a variety discriminate factor. There was no association with the geographical origin of the samples.
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Affiliation(s)
- S Casal
- CEQUP/Serviço de Bromatologia, Faculdade de Farmácia, Universidade do Porto, Portugal
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Braga AC, Oliveira MB, Feliciano GD, Reiniger IW, Oliveira JF, Silva CR, Bernardo-Filho M. The effect of drugs on the labeling of blood elements with technetium-99m. Curr Pharm Des 2000; 6:1179-91. [PMID: 10903389 DOI: 10.2174/1381612003399897] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The influence of drugs on the labeling of red blood cells and plasma proteins with 99mTc has been reported. Any drug, which alters the labeling of the tracer, could be expected to modify the disposition of the radiopharmaceuticals. Red blood cells (RBC) labeled with technetium-99m (99mTc) are used for several evaluations in nuclear medicine. We have evaluated the effect of Thuya occidentalis, Peumus boldus and Nicotiana tabacum (tobacco) extracts on the labeling of RBC and plasma and cellular proteins with 99mTc. Blood was incubated with the drugs. Stannous chloride (SnCl2) solutions and 99mTc were added. Plasma (P) and blood cells (BC) were separated. The percentage of radioactivity (%ATI) bound to P and BC was determined. The %ATI on the plasma and cellular proteins was also evaluated by precipitation of P and BC samples with trichloroacetic acid (TCA) and isolation of soluble (SF) and insoluble (IF) fractions. The analysis of the results shows that there is a decrease in %ATI (from 97.64 to 75.89 percent) in BC with Thuya occidentalis extract. The labeling of RBC and plasma proteins can be decreased in presence of tobacco. This can be due either a direct or indirect effect (reactive oxygen species) of tobacco. The analysis of radioactivity in samples of P and BC isolated from samples of whole blood treated with Peumus boldus showed a rapid uptake of the radioactivity by blood cells in the presence of the Peumus boldus, whereas there was a slight decrease in the amount of 99mTc radioactivity in the TCA-insoluble fraction of plasma. This study shows that extracts of some medicinal plants can affect the radiolabeling of red blood cells with 99mTc using an in vitro technique.
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Affiliation(s)
- A C Braga
- Universidade do Estado do Rio de Janeiro, Instituto de Biologia Roberto Alcantara Gomes, Departamento de Biofísica e Biometria, Av. 28 de setembro, 87, Rio de Janeiro, 20551-030, RJ, Brasil
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Casal S, Oliveira MB, Ferreira MA. Gas chromatographic quantification of amino acid enantiomers in food matrices by their N(O,S)-ethoxycarbonyl heptafluorobutyl ester derivatives. J Chromatogr A 2000; 866:221-30. [PMID: 10670812 DOI: 10.1016/s0021-9673(99)01105-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [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: 11/28/2022]
Abstract
Several amino acid enantiomer derivatives were prepared with different chloroformates and analysed by gas chromatography (GC) on a Chirasil-L-Val GC column, at a temperature below 200 degrees C. Among them the N(O,S)-ethoxycarbonyl heptafluorobutyl esters presented the best compromise between short retention times, high yield responses and good resolution for almost all the tested amino acids. These derivatives proved to be suited for quantification of amino acids in aqueous media, with L-p-chlorophenylalanine as internal standard. The developed procedure was applied to several food samples for determination of their free amino acid profiles.
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Affiliation(s)
- S Casal
- CEQUP/Serviço de Bromatologia, Faculdade de Farmácia da Universidade do Porto, Portugal
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Abstract
This article presents data from juvenile delinquents in the Rio de Janeiro Minors Court. It is an exploratory study with qualitative and quantitative approaches, conducted in 1994 in three schools (Padre Severino Institute, João Luiz Alves School, and Santos Dumont School) in Greater Metropolitan Rio de Janeiro and responsible for the legal custody of juvenile delinquents. Social and demographic aspects of the adolescents and families are shown, and the daily routines of employees, adolescents, and researchers are reported. This paper stresses the damaging effects on the lives of these youngsters by their families, society, and judiciary and legal custody institutions. It also suggests approaches and positive ways of reorienting the issue.
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Affiliation(s)
- M B Oliveira
- Primeira Vara da Infância e da Juventude, Praça Onze de Junho 403, Cidade Nova, Rio de Janeiro, RJ 20210-010, Brasil
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Abstract
The effect of methotrexate (MTX) and leucovorin (LCV) on pentose cycle enzymes and the activity of enzymes involved in enzyme defence mechanisms against ROS in HeLa cells, were studied. The effect of MTX was also investigated on the cellular levels of glutathione. MTX inhibited the activity of glucose-6-phosphate and 6-phosphogluconate dehydrogenases. The activities of glutathione reductase and gamma-glutamylcysteine synthetase were also inhibited by the drug. No effect was observed on the activities of catalase, superoxide dismutase or transketolase. LCV had no effect on any of the enzymes studied. MTX decreased the cellular levels of glutathione (70 per cent), while the presence of LCV and glutamine did not interfere with the effect of MTX. The net results appear to show that the biological situation resulting from treatment with MTX leads to a reduction of effectiveness of the antioxidant enzyme defence system.
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Affiliation(s)
- R M Babiak
- Departamento de Bioquímica, Universidade Federal do Paraná Curitiba, Brasil
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22
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Abstract
The possibility of tissue-specific effects regarding mitochondrial sensitivity to AZT was evaluated in this study. When mitochondria isolated from liver, kidney, skeletal and cardiac muscle were oxidizing glutamate, a dose-dependent inhibition by AZT of state 3 respiration was observed; using succinate as substrate the inhibition occurred only in skeletal and cardiac muscle mitochondria. The same results were obtained with FCCP-uncoupled mitochondria. NADH oxidase of intact and disrupted mitochondria, isolated from all four tissues was strongly inhibited. Succinate oxidase activity was inhibited by AZT only in intact mitochondria from skeletal and cardiac muscles, suggesting the involvement of succinate transport systems. Similarly, inhibition by the drug of the hydrolytic activity of H(+)-ATPase was observed only in mitochondria of these tissues. These effects taken together, indicate a tissue/carrier-specific inhibition in vitro, although its precise mechanism requires further research.
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MESH Headings
- Animals
- Dose-Response Relationship, Drug
- Electron Transport/drug effects
- Kidney/enzymology
- Male
- Mitochondria/drug effects
- Mitochondria/enzymology
- Mitochondria, Heart/drug effects
- Mitochondria, Heart/enzymology
- Mitochondria, Liver/drug effects
- Mitochondria, Liver/enzymology
- Mitochondria, Muscle/drug effects
- Mitochondria, Muscle/enzymology
- Multienzyme Complexes/drug effects
- Muscle, Skeletal/enzymology
- NADH, NADPH Oxidoreductases/drug effects
- Oxygen Consumption/drug effects
- Proton-Translocating ATPases/drug effects
- Rats
- Rats, Wistar
- Succinic Acid/metabolism
- Zidovudine/adverse effects
- Zidovudine/pharmacology
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Affiliation(s)
- L F Pereira
- Departamento de Bioquímica, Universidade Federal do Paraná, Curitiba, Brazil
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23
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Caetano NN, Campello AP, Carnieri EG, Kluppel ML, Oliveira MB. Effect of methotrexate (MTX) on NAD(P)+ dehydrogenases of HeLa cells: malic enzyme, 2-oxoglutarate and isocitrate dehydrogenases. Cell Biochem Funct 1997; 15:259-64. [PMID: 9415972 DOI: 10.1002/(sici)1099-0844(199712)15:4<259::aid-cbf749>3.0.co;2-d] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The effects of methotrexate (MTX) on oxygen uptake by permeabilized HeLa cells were evaluated. MTX did not inhibit state III respiration when the oxidizable substrate was succinate, but when the substrates were 2-oxoglutarate or isocitrate the respiration decreased about 50 per cent at 1.0 mM concentration of the drug. This effect was explained by inhibition of 2-oxoglutarate and isocitrate dehydrogenases by MTX. No effect was observed on succinate dehydrogenase. An evaluation of the effects of MTX on malic enzyme activity as measured by pyruvate plus lactate production in intact cells supplied with malate showed a decrease of about 40 per cent in metabolite production using 0.4 mM MTX. HeLa cell malic enzyme, as observed for other tumour cells, is compartmentalized in mitochondria and cytosol, and is another example of a dehydrogenase inhibited by MTX.
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Affiliation(s)
- N N Caetano
- Departamento de Bioquímica da Universidade Federal do Paraná, Curitiba, Brasil
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24
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Leão AM, Buchi DF, Iacomini M, Gorin PA, Oliveira MB. Cytotoxic effect against HeLa cells of polysaccharides from the lichen Ramalina celastri. J Submicrosc Cytol Pathol 1997; 29:503-9. [PMID: 9397587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The most active polysaccharides which show anti-tumoral activity are (1-->3)-beta-D-glucans, branched or not at O-6. Since these structures are sometimes poorly soluble in aqueous media, alpha-D-glucans and their chemical derivatives, which are more soluble, were also studied. The present object is to observe morphological alterations in HeLa cells caused by two different polysaccharides obtained from the lichen Ramalina celastri, which are (1-->3),(1-->4)-linked alpha-D-glucan and its sulphated derivative. The cells were incubated in Eagle's medium in the absence or presence of each polysaccharide and routinely processed and analysed by light and electron microscopy. Even though the alpha-D-glucan altered the cellular volume, cytoplasmic densities, and mitosis, the resulting monolayer was similar to the control. TEM analysis showed cytoplasmic blebbing and the presence of an amorphous electron-dense material free in the cytoplasm and interior membranes. The enhanced injury caused by the sulphated derivative was apparent, altering cell adhesion and causing cell aggregation. Nuclear modifications such as fragmentation and condensation of chromatin under the nuclear envelope, which showed to be convoluted, suggested the occurrence of cell death by apoptosis.
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Affiliation(s)
- A M Leão
- Department of Animal Morphology and Physiology, Federal Rural University of Pernambuco, Recife, PE, Brazil
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25
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Simões SB, Machado-Silva JR, Gutfilen B, Presgrave OA, Oliveira MB, Bernardo Filho M. Biodistribution study of the anaesthetic sodium phenobarbital labelled with technetium-99m in Swiss mice infected with Schistosoma mansoni Sambon, 1907. Mem Inst Oswaldo Cruz 1997; 92:677-81. [PMID: 9580487 DOI: 10.1590/s0074-02761997000500022] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Technetium-99m (99m Tc) is a radionuclide that has negligible environmental impact, is easily available, inexpensive and can be used as a radioactive tracer in biological experiences. In order to know the mode of action of sodium phenobarbital in moving adult Schistosoma mansoni worms from mesenteric veins to the liver, we labelled sodium phenobarbital (PBBT) with 99mTc and a biodistribution study in infected and non-infected Swiss mice was performed. The PBBT was incubated with stannous chloride used as reducing agent and with 99mTc, as sodium pertechnetate. The radioactivity labelling (%) was determined by paper ascending chromatography performed with acetone (solvent). The 99mTc-PBBT was administered by intraperitoneal route to Swiss mice infected eight weeks before. The animals were perfused after different periods of time (0,1,2,3,4 hr) when blood, spleen, liver, portal vein, mesenteric veins, stomach, kidneys and adult worms were isolated. The radioactivity present in these samples was counted in a well counter and the percentage was determined. The radioactivity was mainly taken up by the blood, kidney, liver and spleen. No radioactivity was found on the adult worms. We concluded that the worm shift was due to an action on the host of the sodium phenobarbital.
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Affiliation(s)
- S B Simões
- Departamento de Patologia e Laboratórios, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Brasil
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26
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Chagas GM, Oliveira MB, Campello AP, Klüppel ML. Mechanism of citrinin-induced dysfunction of mitochondria. III. Effects on renal cortical and liver mitochondrial swelling. J Appl Toxicol 1995; 15:91-5. [PMID: 7782564 DOI: 10.1002/jat.2550150206] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The effects of the mycotoxin citrinin on renal cortical and liver mitochondrial swelling were studied. Citrinin decreases the rate of swelling induced by the valinomycin-K+ complex, suggesting that the mycotoxin interferes with the mitochondrial membrane fluidity. Citrinin promotes reduction of the amplitude of swelling in the presence of Na+ ions. This alteration reflects interference with complex I of the respiratory chain and ATP synthase complex activity without disarranging the inner mitochondrial membrane, in view of the fact that the shrinkage was not affected. The effect increases with citrinin concentration. Renal tissue is more susceptible than hepatic tissue.
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Affiliation(s)
- G M Chagas
- Departamento de Bioquímica da Universidade Federal do Paraná, Brasil
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27
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Medina NH, Oliveira MB, Tobin S, Kiil G, Mendoca MM, de Barros OM, Newland HS, da Costa WA. The prevalence of trachoma in preschool and school children in Olimpia, Guaraci and Cajobi, Sao Paulo, Brazil. Trop Med Parasitol 1992; 43:121-3. [PMID: 1519024] [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] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A school-based prevalence survey of trachoma was conducted in three rural municipalities in the state of Sao Paulo, Brazil, in 1989. A total of 950 children aged 4-11 years were examined. The prevalence of inflammatory trachoma was found to be 6.3%, peaking at 24.1% in the 4 year-old age group. The prevalence of trachomatous scarring was 2.7% and was more prevalent in older children. Risk factors included household sleeping arrangements and nasal discharge.
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Affiliation(s)
- N H Medina
- Sanitary Ophthalmology Service, World Health Organization Collaborating Center for the Prevention of Blindness Program, Sao Paulo, Brazil
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28
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Luna EJ, Medina NH, Oliveira MB, de Barros OM, Vranjac A, Melles HH, West S, Taylor HR. Epidemiology of trachoma in Bebedouro State of São Paulo, Brazil: prevalence and risk factors. Int J Epidemiol 1992; 21:169-77. [PMID: 1544750 DOI: 10.1093/ije/21.1.169] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Trachoma was considered to have been 'eradicated' from the state of São Paulo, Brazil, until 1982 when a number of new cases of trachoma were reported in preschool children in Bebedouro, a small town in northwestern São Paulo. A household survey was undertaken to assess the prevalence and epidemiological characteristics of trachoma. A total of 2939 people of all ages was examined having been selected from a two-stage probalilistic household sampling frame based on census data. Overall, 7.2% of the population had evidence of one or more signs of trachoma and 2.1% had inflammatory trachoma. Inflammatory trachoma was more common in children aged one to ten years, especially in the peripheral urban and rural areas, and was more common in boys. The presence of chlamydia was confirmed by direct fluorescent antibody cytology. No cases of blindness due to trachoma were seen. A number of socioeconomic and hygiene variables were studied in order to determine the independent risk factors for trachoma in a household. Variables significantly associated with the occurrence of trachoma in the household were the number of children in the house aged one to ten years, the 'per capita' water consumption, the frequency of garbage collections, source of water, and the educational level of the head of household. Clustering of trachoma in different parts of this community was entirely explained by the concentration of households with these characteristics.
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Affiliation(s)
- E J Luna
- Epidemiologic Surveillance Center, Sao Paulo Health Department, Brazil
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29
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Oliveira MB, Campello AP, Klüppel WL. Methotrexate: studies on cellular metabolism. III.--Effect on the transplasma-membrane redox activity and on ferricyanide-induced proton extrusion by HeLa cells. Cell Biochem Funct 1989; 7:135-7. [PMID: 2548755 DOI: 10.1002/cbf.290070209] [Citation(s) in RCA: 10] [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: 01/01/2023]
Abstract
The effect of methotrexate (MTX) on transplasma-membrane electron transport and ferricyanide-induced proton extrusion by HeLa cells was studied. Both systems were inhibited by MTX. It is suggested that inhibition of electron transport and proton extrusion caused by MTX could be associated with other metabolic alterations such as response to the increase in NADH levels and decrease in intracellular pH.
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Affiliation(s)
- M B Oliveira
- Departamento de Bioquimica da Universidade Federal do Paraná, Brasil
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30
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Yamamoto N, Oliveira MB, Campello ADP, Lopes LC, Klüppel ML. Methotrexate: studies on the cellular metabolism. I. Effect on mitochondrial oxygen uptake and oxidative phosphorylation. Cell Biochem Funct 1988; 6:61-6. [PMID: 2832095 DOI: 10.1002/cbf.290060110] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Effect of methotrexate (MTX) on mitochondrial oxygen uptake, oxidative phosphorylation and on the activity of several enzymes linked to respiratory chain was studied. MTX was able to inhibit state III respiration activated by ADP and to decrease the respiratory coefficient with the substrates alpha-ketoglutarate and glutamate; these effects became pronounced when mitochondria were pre-incubated with MTX for 10 min. No effect was observed on ATPase activity of undamaged or broken mitochondria; the same was true for NADH-oxidase, NADH-dehydrogenase, NADH-cytochrome c reductase, succinate oxidase, and cytochrome c oxidase activity. The effect on the steady-state of cytochrome b, as well as, the inhibitory effect on state III of respiration with NAD+-linked substrates, offers a reasonable possibility to suggesting that the inhibition site of MTX could be in a place anterior to cytochrome b region, and not linked to respiratory chain.
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Affiliation(s)
- N Yamamoto
- Departamento de Bioquímica, Universidade Federal do Paraná, Brasil
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31
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Abstract
The effect of glucose on the enzymes involved in the degradation of a reserve alpha-glucan in Polyporus circinatus was studied. The levels of phosphorylase activity, endoamylase, amylo-1,6-glucosidase were regulated by glucose concentration.
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