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Id: biblio-1012357
Autor: Hassanpour, Azam; Hassanpour, Ashraf; Rezvani, Mohammad Ebrahim; Hosseini-Sharifabad, Mohamad; Basiri, Mohsen.
Título: The effect of intermittent fasting diet on the hippocampus of adult male mouse after inducing demyelination by ethidium bromide injection / Efecto de la dieta de ayuno intermitente en el hipocampo de ratón macho adulto después de inducir la desmielinización por inyección de bromuro de etidio
Fonte: Int. j. morphol;37(3):805-814, Sept. 2019. tab, graf.
Idioma: en.
Projeto: Kerman University of Medical Sciences.
Resumo: Intermittent fasting diet (IF) as a restrictive regimen prevents neural degeneration and stimulates overexpression of various neurotropic factors in the hippocampus of animal models. This study evaluates the potential effect of the IF in the prevention of learning and memory dysfunction and improving the alterations in the number and volume of neurons in an ethidium bromide (EB) induced mouse model of demyelination.Mice were randomly assigned into N group (Normal Diet and normal saline injection), F group (IF and normal saline injection), EBN group (Normal Diet and EB injection), EBF group (IF and EB injection). The hidden platform test was carried out based on path length, escape latency and swim speeds of mice. Stereological studies were determined by the Cavalieri and the Optical Dissector technique. Maintenance of mice on the IF results in significantly decreased the body weight and biochemical parameters, increased total number of neurons and volume of the hippocampus, and improved learning and memory parameters of adult male mice. However, IF in EBF group did not show as excellently as F group. The EBF group displayed significantly spatial memory improvement than that in EBN group. There were no statistically significant differences between EBF and EBN groups in stereological and learning parameters, though the EBF group displayed faster escape latencies, and swam faster and shorter path lengths than the EBN group in these parameters. Therefore as a conclusion, The IF fairly improved some adverse effects of EB in experimental demyelination models.

La dieta de ayuno intermitente (AI) como régimen restrictivo, previene la degeneración neural y la estimación de la presencia de diversos factores neurotrópicos en el hipocampo de modelos animales. Este estudio evalúa el efecto potencial de la AI en la prevención del aprendizaje y la disfunción de la memoria y mejora las alteraciones en el número y el volumen de las neuronas en un modelo de desmielinización, en ratón, inducido con bromuro de etidio (BE). Los ratones se asignaron al azar en el grupo N (dieta normal e inyección salina normal), Grupo A (AI e inyección salina normal), Grupo BEN (dieta normal e inyección BE), Grupo EBF (inyección AI y BE). La prueba de la plataforma oculta se llevó a cabo en función de la longitud del trayecto, la latencia de escape y la velocidad de nado de los ratones. Los estudios estereológicos fueron determinados por la técnica de Cavalieri y la técnica del disector óptico. En el grupo AI disminuyeron significativamente el peso corporal de los ratones, los parámetros bioquímicos, el número total de neuronas y el volumen del hipocampo, y los parámetros de aprendizaje y la memoria de los ratones machos adultos. Sin embargo, el grupo AI en BEF no se mostró tan bien como el grupo A. El grupo EBF mostró una mejora en la memoria espacial significativamente mayor que la del grupo BEN. No hubo diferencias estadísticamente significativas entre los grupos A, BE y BEN en los parámetros estereológicos y de aprendizaje, aunque el grupo EBF mostró latencias de escape más rápidas, y nado en las rutas más rápidas y más cortas que el grupo BEN en estos parámetros. Por lo tanto, como conclusión, el grupo AI mejoró bastante algunos efectos adversos de la BE en los modelos de desmielinización experimental.
Descritores: Jejum
Doenças Desmielinizantes/induzido quimicamente
Hipocampo/patologia
-Peso Corporal
Modelos Animais de Doenças
Etídio/toxicidade
Aprendizagem
Camundongos Endogâmicos BALB C
Limites: Animais
Masculino
Camundongos
Responsável: CL1.1 - Biblioteca Central


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Alvarez, M
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Id: lil-708727
Autor: Alvarez, M; Urbina, G; Perdomo, L.
Título: Excretion product of shigella dysenteriae (sdyep) induced cell death in early larval stage of zebrafish (danio rerio): acridine orange and ethidium bromide (AO/EB) in vivo staining / Producto de excreción de shigella dysenteriae (pesdy) induce muerte celular en larvas de pez cebra (danio rerio): marcaje in vivo con naranja de acridina y bromuro de etidio (NA/BE)
Fonte: Int. j. morphol;32(1):84-89, Mar. 2014. ilus.
Idioma: en.
Resumo: In the field of studies of acute toxicity induced by bacterial agents, Shiga toxins have been relevant due to the severity of the extra-intestinal diseases they cause. Numerous studies have shown that Shiga toxin induced apoptosis in different cell types; however, this important process has been little studied in vivo experimental models. In this study, the effects of excretion products of Shigella dysenteriae, in which Shiga toxin is present, were investigated on early larval stages of Zebrafish, an animal model with many advantages over other in vivo experimental models traditionally used. Both the collection of eggs and larvae of Zebrafish, and the product from excretion from Shigella dysenteriae (SdyEP) were performed according to laboratory standards. Also, toxicity bioassay, larvae treatment with pure and diluted solution, 10-1, 10-2, 10-3 , 10-4 and 10-5, v/v SdyEP and cell death in vivo using Acridine Orange (AO) and Ethidium Bromide (EB) were applied. The excretion product of Shigella dysenteriae (SdyEP) effect was expressed in terms of larval mortality and dependent dilution rather than incubation time. The larval population surviving treatment with Shigella excretion product presents severe morphological effects. The larval population generally presents notable severe morphological damage, the necrosis state is represented by the opacity of the larvae after being treated for 24 h (b) compared to control. Other changes associated with larval anatomy were also observed; particularly the caudal end curvature was significant into 10%. The use of AO/EB revealed a distribution pattern from fluorescence into green and orange in surviving larvae SdyEP poisoning, there was a large population of dead cells around the anal and caudal region as evidenced by the presence of orange nuclei in greater numbers as controls in the larvae. The results support the application of coloring AO/EB in Zebrafish experimental models for the evaluation of the toxic action of new molecules and new products with therapeutic potential.

En el campo de los estudios de toxicidad aguda inducida por agentes bacterianos, las toxinas Shiga resultan relevantes debido a la severidad de las enfermedades extra-intestinales que causan. Numerosos estudios han demostrado que la toxina Shiga induce la apoptosis en diferentes tipos de células, sin embargo, este importante proceso ha sido poco estudiado en modelos experimentales in vivo. En este estudio, fueron evaluados los efectos del productos de excreción de Shigella dysenteriae (PESdy), sobre estadios larvarios de pez cebra (Danio rerio), un modelo animal con muchas ventajas sobre otros modelos experimentales in vivo utilizados tradicionalmente. Tanto la recolección de los huevos y larvas de pez cebra, así como la obtención del producto de la excreción, se realizaron de acuerdo a los estándares de laboratorio. Poblaciones larvarias, fueron tratadas con distintas soluciones; pura y diluidas, 101, 10-2, 10-3, 10-4 y 10-5, v/v de PESdy. La muerte celular in vivo, usando naranja de acridina (NA) y bromuro de etidio (BE) fue evaluada. El efecto del SdyEP, se expresó como dependiente de la concentracion y del tiempo de exposición. La población de larvas sobrevivientes, presentaron curvatura troncal en un 10%, en relación a los controles. La necrosis se puso en evidencia a través de la opacidad de las larvas después de 24 h. El uso de NA/BE reveló un patrón de distribución de la fluorescencia en verde y naranja en larvas sobrevivientes al tratamiento. Una granpoblación de células muertas, alrededor de la región anal y caudal, se ponen en evidencia por la presencia de núcleos de naranja en mayor número que en los controles. Los resultados apoyan la aplicación de la coloración NA/BE en modelo experimental de pez cebra, para la evaluación de la acción tóxica de nuevas moléculas y nuevos productos de excreción bacterial con potencial terapéutico.
Descritores: Shigella dysenteriae/fisiologia
Peixe-Zebra
Apoptose
Toxina Shiga/toxicidade
-Laranja de Acridina
Etídio
Larva
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-840076
Autor: Jordão, Camila P; Fernandes, Tiago; Tanaka, Leonardo Yuji; Bechara, Luiz R. Grassmann; de Sousa, Luis Gustavo Oliveira; Oliveira, Edilamar M; Ramires, Paulo Rizzo.
Título: Aerobic Swim Training Restores Aortic Endothelial Function by Decreasing Superoxide Levels in Spontaneously Hypertensive Rats
Fonte: Clinics;72(5):310-316, May 2017. graf.
Idioma: en.
Resumo: OBJECTIVE: We aimed to determine whether aerobic training decreases superoxide levels, increases nitric oxide levels, and improves endothelium-dependent vasodilation in the aortas of spontaneously hypertensive rats. METHODS: Spontaneously hypertensive rats (SHR) and Wistar Kyoto rats (WKY) were distributed into 2 groups: sedentary (SHRsd and WKYsd, n=10 each) and swimming-trained (SHRtr, n=10 and WKYtr, n=10, respectively). The trained group participated in training sessions 5 days/week for 1 h/day with an additional work load of 4% of the animal’s body weight. After a 10-week sedentary or aerobic training period, the rats were euthanized. The thoracic aortas were removed to evaluate the vasodilator response to acetylcholine (10-10 to 10-4 M) with or without preincubation with L-NG-nitro-L-arginine methyl ester hydrochloride (L-NAME; 10-4 M) in vitro. The aortic tissue was also used to assess the levels of the endothelial nitric oxide synthase and nicotinamide adenine dinucleotide oxidase subunit isoforms 1 and 4 proteins, as well as the superoxide and nitrite contents. Blood pressure was measured using a computerized tail-cuff system. RESULTS: Aerobic training significantly increased the acetylcholine-induced maximum vasodilation observed in the SHRtr group compared with the SHRsd group (85.9±4.3 vs. 71.6±5.2%). Additionally, in the SHRtr group, superoxide levels were significantly decreased, nitric oxide bioavailability was improved, and the levels of the nicotinamide adenine dinucleotide oxidase subunit isoform 4 protein were decreased compared to the SHRsd group. Moreover, after training, the blood pressure of the SHRtr group decreased compared to the SHRsd group. Exercise training had no effect on the blood pressure of the WKYtr group. CONCLUSIONS: In SHR, aerobic swim training decreased vascular superoxide generation by nicotinamide adenine dinucleotide oxidase subunit isoform 4 and increased nitric oxide bioavailability, thereby improving endothelial function.
Descritores: Aorta Torácica/fisiopatologia
Endotélio Vascular/fisiopatologia
Hipertensão/fisiopatologia
Condicionamento Físico Animal/fisiologia
Superóxidos/análise
Natação/fisiologia
-Western Blotting
Etídio/análogos & derivados
Teste de Esforço
Fluorescência
Hemodinâmica
NAD/análise
NG-Nitroarginina Metil Éster/análise
NG-Nitroarginina Metil Éster/metabolismo
Óxido Nítrico Sintase Tipo III/análise
Óxido Nítrico Sintase Tipo III/metabolismo
Nitritos/análise
Nitritos/metabolismo
Distribuição Aleatória
Ratos Endogâmicos SHR
Valores de Referência
Reprodutibilidade dos Testes
Superóxidos/metabolismo
Fatores de Tempo
Vasodilatação/fisiologia
Limites: Animais
Masculino
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Abreu, G.R.
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Id: lil-765006
Autor: Borgo, M.V.; Claudio, E.R.G.; Silva, F.B.; Romero, W.G.; Gouvea, S.A.; Moysés, M.R.; Santos, R.L.; Almeida, S.A.; Podratz, P.L.; Graceli, J.B.; Abreu, G.R..
Título: Hormonal therapy with estradiol and drospirenone improves endothelium-dependent vasodilation in the coronary bed of ovariectomized spontaneously hypertensive rats
Fonte: Braz. j. med. biol. res = Rev. bras. pesqui. méd. biol;49(1):00601, 2016. tab, graf.
Idioma: en.
Resumo: Drospirenone (DRSP) is a progestin with anti-aldosterone properties and it reduces blood pressure in hypertensive women. However, the effects of DRSP on endothelium-dependent coronary vasodilation have not been evaluated. This study investigated the effects of combined therapy with estrogen (E2) and DRSP on endothelium-dependent vasodilation of the coronary bed of ovariectomized (OVX) spontaneously hypertensive rats. Female spontaneously hypertensive rats (n=87) at 12 weeks of age were randomly divided into sham operated (Sham), OVX, OVX treated with E2 (E2), and OVX treated with E2 and DRSP (E2+DRSP) groups. Hemodynamic parameters were directly evaluated by catheter insertion into the femoral artery. Endothelium-dependent vasodilation in response to bradykinin in the coronary arterial bed was assessed using isolated hearts according to a modified Langendorff method. Coronary protein expression of endothelial nitric oxide synthase and estrogen receptor alpha (ER-α) was assessed by Western blotting. Histological slices of coronary arteries were stained with hematoxylin and eosin, and morphometric parameters were analyzed. Oxidative stress was assessed in situ by dihydroethidium fluorescence. Ovariectomy increased systolic blood pressure, which was only prevented by E2+DRSP treatment. Estrogen deficiency caused endothelial dysfunction, which was prevented by both treatments. However, the vasodilator response in the E2+DRSP group was significantly higher at the three highest concentrations compared with the OVX group. Reduced ER-α expression in OVX rats was restored by both treatments. Morphometric parameters and oxidative stress were augmented by OVX and reduced by E2 and E2+DRSP treatments. Hormonal therapy with E2 and DRSP may be an important therapeutic option in the prevention of coronary heart disease in hypertensive post-menopausal women.
Descritores: Androstenos/administração & dosagem
Vasos Coronários/efeitos dos fármacos
Endotélio Vascular/efeitos dos fármacos
Estradiol/administração & dosagem
Terapia de Reposição Hormonal/métodos
Hipertensão/tratamento farmacológico
Vasodilatação/efeitos dos fármacos
-Western Blotting
Bradicinina/farmacologia
Terapia Combinada
Vasos Coronários/patologia
Receptor alfa de Estrogênio/efeitos dos fármacos
Estrogênios/administração & dosagem
Etídio/análogos & derivados
Artéria Femoral
Hemodinâmica
Antagonistas de Receptores de Mineralocorticoides/administração & dosagem
Óxido Nítrico Sintase Tipo III/efeitos dos fármacos
Ovariectomia
Estresse Oxidativo/efeitos dos fármacos
Distribuição Aleatória
Ratos Endogâmicos SHR
Vasodilatadores/farmacologia
Limites: Animais
Feminino
Ratos
Responsável: BR1.1 - BIREME


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Bondan, Eduardo Fernandes
Bernardi, Maria Martha
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Id: lil-746451
Autor: Bondan, Eduardo Fernandes; Martins, Maria de Fátima Monteiro; Bernardi, Maria Martha.
Título: Propentofylline reverses delayed remyelination in streptozotocin-induced diabetic rats
Fonte: Arch. endocrinol. metab. (Online);59(1):47-53, 02/2015. tab, graf.
Idioma: en.
Resumo: Objective The diabetic state induced by streptozotocin injection is known to impair oligodendroglial remyelination in the rat brainstem following intracisternal injection with the gliotoxic agent ethidium bromide (EB). In such experimental model, propentofylline (PPF) recently showed to improve myelin repair, probably due to its neuroprotective, antiinflammatory and antioxidant effects. The aim of this study was to evaluate the effect of PPF administration in diabetic rats submitted to the EB-demyelinating model. Materials and methods Adult male rats, diabetic or not, received a single injection of 10 microlitres of 0.1% EB solution into the cisterna pontis. For induction of diabetes mellitus the streptozotocin-diabetogenic model was used (50 mg/kg, intraperitoneal route – IP). Some diabetic rats were treated with PPF (12.5 mg/kg/day, IP route) during the experimental period. The animals were anesthetized and perfused from 7 to 31 days after EB injection and brainstem sections were collected for analysis of the lesions by light and transmission electron microscopy. Results Diabetic rats injected with EB showed larger amounts of myelin-derived membranes in the central areas of the lesions and considerable delay in the remyelinating process played by surviving oligodendrocytes and invading Schwann cells after the 15th day. On the other hand, diabetic rats that received PPF presented lesions similar to those of non-diabetic animals, with rapid remyelination at the edges of the lesion site and fast clearance of myelin debris from the central area. Conclusion The administration of PPF apparently reversed the impairment in remyelination induced by the diabetic state. Arch Endocrinol Metab. 2015;59(1):47-53 .
Descritores: Astrócitos/efeitos dos fármacos
Doenças Desmielinizantes/tratamento farmacológico
Diabetes Mellitus Experimental/tratamento farmacológico
Bainha de Mielina/fisiologia
Fármacos Neuroprotetores/farmacologia
Xantinas/farmacologia
-Modelos Animais de Doenças
Doenças Desmielinizantes/patologia
Diabetes Mellitus Experimental/induzido quimicamente
Etídio/toxicidade
Microscopia Eletrônica de Transmissão
Macrófagos/efeitos dos fármacos
Mesencéfalo/patologia
Regeneração Nervosa/efeitos dos fármacos
Fármacos Neuroprotetores/administração & dosagem
Ponte/patologia
Ratos Wistar
Estreptozocina
Células de Schwann/efeitos dos fármacos
Xantinas/administração & dosagem
Limites: Animais
Masculino
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Id: lil-723133
Autor: Gressler, Letícia Trevisan; Vargas, Agueda Castagna de; Costa, Mateus Matiuzzi da; Pötter, Luciana; Silveira, Bibiana Petri da; Sangioni, Luis Antônio; Botton, Sônia de Avila.
Título: Genotypic and phenotypic detection of efflux pump in Rhodococcus equi
Fonte: Braz. j. microbiol;45(2):661-665, Apr.-June 2014. ilus, tab.
Idioma: en.
Resumo: The req_39680 gene, associated to a putative efflux system, was detected in 60% (54/90) of R. equi isolates by PCR. The phenotypic expression of efflux mechanism was verified in 20% of the isolates using ethidium bromide. For the first time, the expression of efflux mechanism was demonstrated in R. equi.
Descritores: Proteínas de Membrana Transportadoras/genética
Proteínas de Membrana Transportadoras/metabolismo
Rhodococcus equi/genética
Rhodococcus equi/metabolismo
-Transporte Biológico Ativo
DNA Bacteriano/genética
Etídio/metabolismo
Reação em Cadeia da Polimerase
Responsável: BR1.1 - BIREME


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Id: lil-707519
Autor: Uribe Echeverry, Paula Tatiana; Herrera Cañón, Jhon Camilo; Orozco Clavijo, Néstor Javier; Betancur Pérez, Jhon Fredy.
Título: Uso alternativo del colorante Gelreden la tinción de ácidos nucleicos / Alternative use of gelred dye in the staining nucleic acids
Fonte: Arch. med;13(2):160-166, 30/dez. 2013.
Idioma: es.
Resumo: Objetivo: Determinar la reproducibilidad en la tinción del ADN en geles de agarosa mediante el colorante GelRedTM con el fin de reemplazar el uso del bromuro de etidio en la tinción de ácidos nucleicos. Materiales y Métodos: Se realizó extracción de ADN total de sangre periférica a nueve muestras de pacientes con cáncer colorrectal,posteriormente se amplificó un fragmento de ADN de 494 pb asociado al exón 15 delgen APC y de seis fragmentos entre 150 pb y 350 pb asociados a los genes hMLH-1 y MSH-2; ambas preparaciones, ADN total y ADN amplificado fueron visualizadas mediante el uso del colorante GelRed y Bromuro de Etidio. Resultados: El uso del colorante GelRed para la tinción de ácidos nucleicos (ADN) permitió visualizar los de forma eficiente. Conclusión: El reactivo GelRed es altamente reproducible y se recomienda usarlo incluido en las muestras de ADN, para disminuir la contaminaciónen los laboratorios de biología molecular.
Descritores: Eletroforese em Gel de Ágar
Etídio
Responsável: CO279.1 - Centro de Biblioteca e Información


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Alvarez, M
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Id: lil-702289
Autor: Álvarez, M; Urbina, G; Perdomo, L.
Título: Excretion product of shigella dysenteriae (sdyep) induced cell death in early larval stage of zebrafish (danio rerio): acridine orange and ethidium bromide (ao/eb) in vivo staining / El producto de excreción de la shigella dysenteriae (pesdy) Induce muerte celular en larvas de pez cebra (danio rerio): marcaje in vivo con naranja de acridina y bromuro de etidio (na/be)
Fonte: Int. j. morphol;31(4):1175-1180, Dec. 2013. ilus.
Idioma: en.
Resumo: In the field of studies of acute toxicity induced by bacterial agents, Shiga toxins have been relevant due to the severity of the extra-intestinal diseases they cause. Numerous studies have shown that Shiga toxin induced apoptosis in different cell types; however, this important process has been little studied in vivo experimental models. In this study, the effects of excretion products of Shigella dysenteriae, in which Shiga toxin is present, we investigated on early larval stages of Zebrafish, an animal model with many advantages over other in vivo experimental models traditionally used. Both the collection of eggs and larvae of Zebrafish, and the product from excretion from Shigella dysenteriae (SdyEP) were performed according to laboratory standards. Also, toxicity bioassay, larvae treatment with pure and diluted solution, 10-1, 10-2, 10-3 , 10-4 and 10-5 v/v SdyEP and cell death in vivo using Acridine Orange (AO) and Ethidium Bromide (EB) were applied. The excretion product of Shigella dysenteriae (SdyEP) effect was expressed in terms of larval mortality and dependent dilution rather than incubation time. The larval population surviving treatment with Shigella excretion product presents severe morphological effects. The larval population generally presents notable severe morphological damage, the necrosis state is represented by the opacity of the larvae after being treated for 24 h (b) compared to control. Other changes associated with larval anatomy were also observed; particularly the caudal end curvature was significant into 10%. The use of AO/EB revealed a distribution pattern from fluorescence into green and orange in surviving larvae SdyEP poisoning, there was a large population of dead cells around the anal and caudal region as evidenced by the presence of orange nuclei in greater numbers as controls in the larvae. The results support the application of coloring AO/EB in Zebrafish experimental...

En el campo de los estudios de toxicidad aguda inducida por agentes bacterianos, las toxinas Shiga resultan relevantes debido a la severidad de las enfermedades extra-intestinales que causan. Numerosos estudios han demostrado que la toxina Shiga induce la apoptosis en diferentes tipos de células, sin embargo, este importante proceso ha sido poco estudiado en modelos experimentales in vivo. En este estudio, fueron evaluados los efectos del productos de excreción de Shigella dysenteriae (PESdy), sobre estadios larvarios de pez cebra (Danio rerio), un modelo animal con muchas ventajas sobre otros modelos experimentales in vivo utilizados tradicionalmente. Tanto la recolección de los huevos y larvas de pez cebra, así como la obtención del producto de la excreción, se realizaron de acuerdo a los estándares de laboratorio. Poblaciones larvarias, fueron tratadas con distintas soluciones; pura y diluidas, 10-1, 10-2, 10-3 , 10-4 and 10-5 v/v de PESdy. La muerte celular in vivo, usando naranja de acridina (NA) y bromuro de etidio (BE) fue evaluada. El efecto del PESdy, se expresó como dependiente de la concentración y del tiempo de exposición. La población de larvas sobrevivientes, presentaron curvatura troncal en un 10 por ciento, en relación a los controles. La necrosis se puso en evidencia a través de la opacidad de las larvas después de 24 h. El uso de NA/BE reveló un patrón de distribución de la fluorescencia en verde y naranja en larvas sobrevivientes al tratamiento. Una gran población de células muertas, alrededor de la región anal y caudal, se ponen en evidencia por la presencia de núcleos de naranja en mayor número que en los controles. Los resultados apoyan la aplicación de la coloración NA/BE en modelo experimental...
Descritores: Apoptose
Larva
Shigella dysenteriae/patogenicidade
Toxina Shiga/toxicidade
Peixe-Zebra
-Laranja de Acridina
Morte Celular
Etídio
Limites: Animais
Responsável: CL1.1 - Biblioteca Central


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Bondan, Eduardo Fernandes
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Id: lil-685404
Autor: Bondan, Eduardo Fernandes; Martins, Maria de Fátima Monteiro; Viani, Flávio Cesar.
Título: Decreased astrocytic GFAP expression in streptozotocin-induced diabetes after gliotoxic lesion in the rat brainstem / Expressão astrocitária diminuída de GFAP no diabetes induzido por estreptozotocina após lesão gliotóxica no tronco encefálico de ratos
Fonte: Arq. bras. endocrinol. metab;57(6):431-436, ago. 2013. ilus, tab.
Idioma: en.
Resumo: OBJECTIVE: The aim of this study was to evaluate the effect of diabetic hyperglycemia on astrocyte function, estimated by means of glial fibrillary acidic protein - GFAP - immunohistochemical expression. MATERIALS AND METHODS: Adult male rats received a single intravenous injection of streptozotocin (50 mg/kg) and were submitted 10 days later to a single injection of 10 microlitres 0.1% EB solution or 0.9% saline solution into the cisterna pontis. Ten microliters of 0.1% EB or 0.9% saline solution were also injected in non-diabetic rats. Animals were anesthetized and perfused through the heart 15 and 31 days after EB or saline injection, and brainstem sections were collected for ultrastructural analysis and GFAP immunohistochemical staining. RESULTS: The GFAP brown-stained areas were evaluated by colorimetry using a computerized image analysis system and the results have shown that diabetes hindered the increase of GFAP astrocyte expression in the EB-injected group compared to non-diabetic animals. However, diabetes did not affect GFAP response in the saline-injected group or in control animals. CONCLUSION: Streptozotocin-induced diabetic condition reduced astrocytic GFAP expression following gliotoxic injury.

OBJETIVO: O objetivo deste estudo foi avaliar o efeito da hiperglicemia na função astrocitária, estimada pela expressão imuno-histoquímica da proteína glial fibrilar ácida - GFAP. MATERIAIS E MÉTODOS: Ratos machos adultos receberam uma injeção intravenosa única de estreptozotocina (50 mg/kg) e foram submetidos, 10 dias após, à injeção de 10 microlitros de solução de BE 0,1% ou de salina 0,9% na cisterna pontina. Dez microlitros de BE 0,1% ou salina 0,9% foram também injetados em ratos não diabéticos. Os animais foram anestesiados e perfundidos por via intracardíaca aos 15 e 31 dias pós-injeção de BE ou salina, e amostras de tronco encefálico foram coletadas para estudo ultraestrutural e análise imuno-histoquímica para a GFAP. RESULTADOS: Utilizando um sistema computadorizado de análise de imagens, os resultados das áreas coradas em marrom pela GFAP, medidas por colorimetria, mostram que o diabetes reduziu o aumento de expressão dessa proteína no grupo injetado com BE em comparação aos animais não diabéticos, mas não alterou a resposta no grupo injetado com salina ou nos controles diabéticos. CONCLUSÃO: O estado diabético induzido pela estreptozotocina reduziu a expressão astrocitária de GFAP após dano gliotóxico.
Descritores: Astrócitos/metabolismo
Glicemia/metabolismo
Tronco Encefálico/patologia
Diabetes Mellitus Experimental/patologia
Proteína Glial Fibrilar Ácida/metabolismo
-Tronco Encefálico/efeitos dos fármacos
Modelos Animais de Doenças
Etídio/toxicidade
Proteína Glial Fibrilar Ácida/efeitos adversos
Imuno-Histoquímica
Ratos Wistar
Estreptozocina
Limites: Adulto
Animais
Humanos
Masculino
Ratos
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Texto completo SciELO Brasil
Bondan, Eduardo Fernandes
Texto completo
Id: lil-616908
Autor: Bondan, Eduardo Fernandes; Martins, Maria de Fátima Monteiro.
Título: Blood-brain barrier breakdown and repair following gliotoxic drug injection in the brainstem of streptozotocin-diabetic rats / Ruptura e reparo da barreira hematoencefálica pós-injeção de droga gliotóxica no tronco encefálico ratos diabéticos
Fonte: Arq. neuropsiquiatr;70(3):221-225, Mar. 2012. ilus.
Idioma: en.
Resumo: Ethidium bromide (EB) causes local astrocytic disappearance, with glia limitans disruption and blood-brain barrier (BBB) breakdown. The aim of this study was to evaluate the BBB integrity after the injection of 0.1 percent EB or 0.9 percent saline solution into the cisterna pontis of Wistar rats submitted or not to the streptozotocin diabetogenic model. Brainstem sections were collected from 24 hours to 31 days post-injection for ultrastructural analysis and glial fibrillary acidic protein immunohistochemical staining. Some animals received colloidal carbon ink by intravenous route at the same periods. In rats injected with EB, results revealed astrocyte disappearance and leakage of carbon particles beginning at 48 hours and persisting for 7 days in non-diabetic rats and for 15 days in the diabetic ones, although, in both groups, several areas remained devoid of astrocytic processes up to 31 days. In rats injected with saline, there was no sign of astrocytic loss or carbon particles leakage.

O brometo de etídio (BE) determina o desaparecimento local de astrócitos, com ruptura da glia limitans e dano na barreira hematoencefálica (BHE). Este estudo visou avaliar a integridade da BHE após injeção de solução de BE a 0,1 por cento ou de salina a 0,9 por cento na cisterna pontis de ratos Wistar submetidos ou não ao modelo diabetogênico da estreptozotocina. Fragmentos do tronco encefálico foram coletados das 24 horas aos 31 dias pós-injeção para estudo ultraestrutural e marcação imuno-histoquímica para proteína glial fibrilar ácida. Alguns animais receberam carvão coloidal por via intravenosa nos mesmos períodos. Nos grupos injetados com BE, os resultados mostraram desaparecimento astrocitário e extravasamento de partículas de carvão nas lesões a partir das 48 horas, persistindo por até sete dias nos animais não diabéticos e 15 dias nos diabéticos, embora, em ambos os grupos, diversas áreas permanecessem destituídas de astrócitos até 31 dias após. Nos ratos injetados com salina, diabéticos ou não, não houve sinal de perda astrocitária nem de extravasamento vascular de carvão.
Descritores: Barreira Hematoencefálica/efeitos dos fármacos
Tronco Encefálico/efeitos dos fármacos
Diabetes Mellitus Experimental/patologia
Etídio/farmacologia
Proteína Glial Fibrilar Ácida/química
Cloreto de Sódio/farmacologia
-Barreira Hematoencefálica/metabolismo
Barreira Hematoencefálica/patologia
Tronco Encefálico/patologia
Imuno-Histoquímica
Ratos Wistar
Estreptozocina
Limites: Animais
Masculino
Ratos
Tipo de Publ: Estudo Comparativo
Responsável: BR1.1 - BIREME



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