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  1 / 904 LILACS  
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Lenzi, H. L
Tendler, M
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Id: lil-623699
Autor: Mendonça, M. C. R; Lenzi, H. l; Tendler, M.
Título: Localization of Schistosoma mansoni protective antigens by indirect immunofluorescence
Fonte: Mem. Inst. Oswaldo Cruz;82(supl.4):235-236, 1987. ilus.
Idioma: en.
Conferência: Apresentado em: International Symposium on Schistosomiasis, Apresentado em: Reunião Nacional de Esquistossomose, 1, Rio de Janeiro, Oct. 25-30, 1987.
Projeto: FINEP; . FIOCRUZ.
Descritores: Schistosoma mansoni/imunologia
Imunofluorescência
Antígenos de Helmintos/análise
Limites: Seres Humanos
Masculino
Feminino
Responsável: BR1.1 - BIREME


  2 / 904 LILACS  
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Id: biblio-1020079
Autor: Melo, Tatiana G; Adesse, Daniel; Meirelles, Maria de Nazareth; Pereira, Mirian Claudia S.
Título: Trypanosoma cruzi down-regulates mechanosensitive proteins in cardiomyocytes
Fonte: Mem. Inst. Oswaldo Cruz;114:e180593, 2019. graf.
Idioma: en.
Projeto: Fiocruz; . CNPq; . MCSP; . DA; . Papes VI; . CNPq; . MCSP; . Faperj; . MCSP; . Capes.
Resumo: BACKGROUND Cardiac physiology depends on coupling and electrical and mechanical coordination through the intercalated disc. Focal adhesions offer mechanical support and signal transduction events during heart contraction-relaxation processes. Talin links integrins to the actin cytoskeleton and serves as a scaffold for the recruitment of other proteins, such as paxillin in focal adhesion formation and regulation. Chagasic cardiomyopathy is caused by infection by Trypanosoma cruzi and is a debilitating condition comprising extensive fibrosis, inflammation, cardiac hypertrophy and electrical alterations that culminate in heart failure. OBJECTIVES Since mechanotransduction coordinates heart function, we evaluated the underlying mechanism implicated in the mechanical changes, focusing especially in mechanosensitive proteins and related signalling pathways during infection of cardiac cells by T. cruzi. METHODS We investigated the effect of T. cruzi infection on the expression and distribution of talin/paxillin and associated proteins in mouse cardiomyocytes in vitro by western blotting, immunofluorescence and quantitative real-time polymerase chain reaction (qRT-PCR). FINDINGS Talin and paxillin spatial distribution in T. cruzi-infected cardiomyocytes in vitro were altered associated with a downregulation of these proteins and mRNAs levels at 72 h post-infection (hpi). Additionally, we observed an increase in the activation of the focal adhesion kinase (FAK) concomitant with increase in β-1-integrin at 24 hpi. Finally, we detected a decrease in the activation of FAK at 72 hpi in T. cruzi-infected cultures. MAIN CONCLUSION The results suggest that these changes may contribute to the mechanotransduction disturbance evidenced in chagasic cardiomyopathy.
Descritores: Trypanosoma cruzi/fisiologia
Cardiomiopatia Chagásica/metabolismo
Miócitos Cardíacos/parasitologia
Mecanotransdução Celular/genética
-Western Blotting
Reação em Cadeia da Polimerase
Imunofluorescência
Paxilina/metabolismo
Limites: Animais
Camundongos
Responsável: BR1.1 - BIREME


  3 / 904 LILACS  
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Id: biblio-1002254
Autor: Otawa-Kamogashira, Naoko; Matsuda, Yuko; Takezaki, Masaaki; Hatakeyama, Yuji; Tamaoki, Sachio; Ishikawa, Hiroyuki.
Título: Immunohistochemical study of amelogenin binding proteins in an amelogenin point mutation mouse / Estudio inmunohistoquímico de proteínas de unión de la amelogenina en un ratón con mutación puntual de amelogenina
Fonte: Int. j. morphol;37(2):522-532, June 2019. graf.
Idioma: en.
Projeto: Ministry of Education, Culture, Sports, Science and Technology, Japan.
Resumo: Amelogenin is one of the enamel matrices secreted by ameloblasts. A mutation of the amelogenin gene can cause hereditary dental enamel defects known as amelogenesis imperfecta (AI). Since lysosome-associated membrane protein-1 (LAMP-1), -3 (LAMP-3), and 78kDa glucose-related protein (Grp78) were identified as binding proteins of amelogenin, several studies have suggested the involvement of these binding proteins with the cell kinetics of ameloblasts in normal or abnormal conditions. The purpose of this study is to investigate the distribution of these amelogenin binding proteins in the ameloblast cell differentiation of mice with a point mutation of the amelogenin gene (Amelx*). The incisors of Amelx* mice had a white opaque color and the tooth surface was observed to be rough under a scanning electron microscope. Among the sequential ameloblast cell differentiation in the Amelx* mice, the shape of ameloblasts at the transition stage was irregular in comparison to those in wild-type (WT) mice. Immunostaining of Grp78 revealed that the whole cytoplasm of the transition stage ameloblasts was immunopositive for Grp78 antibody, while only the distal part of cell was positive in the WT mice. Furthermore, in the Amelx* mice, the cytoplasm of the transition stage ameloblasts was immunopositive for LAMP-1 and LAMP-3. These results suggest that Amelx* may cause the abnormal distribution of amelogenin binding proteins in the cytoplasm of ameloblasts.

La amelogenina es una de las matrices de esmalte secretadas por los ameloblastos. Una mutación del gen de amelogenina puede causar defectos hereditarios del esmalte dental conocidos como amelogénesis imperfecta (AI). Dado que la proteína de membrana asociada a lisosoma-1 (LAMP-1), -3 (LAMP-3) y la proteína relacionada con la glucosa de 78 kDa (Grp78) se identificaron como proteína de unión a amelogenina, varios estudios han sugerido la participación de estas proteínas con la cinética celular de los ameloblastos en condiciones normales o anormales. El objetivo del estudio fue investigar la distribución de LAMP-1, LAM-3 y Grp78 durante la diferenciación celular de ameloblastos de ratones con una mutación puntual del gen de amelogenina (Amelx*). Los incisivos de los ratones Amelx* presentaron un color blanco opaco y se observó en microscopio electrónico de barrido que la superficie del diente era áspera. La diferenciación celular secuencial y la forma de los ameloblastos en la etapa de transición en los ratones Amelx* fue irregular en comparación con los ratones silvestres (RS). La inmunotinción de Grp78 reveló que todo el citoplasma de los ameloblastos en etapa de transición fue inmunopositivo para el anticuerpo Grp78, mientras que solo la parte distal de la célula fue positiva en los ratones RS. Además, en ratones Amelx*, el citoplasma de los ameloblastos en etapa de transición fue inmunopositivo para LAMP-1 y LAMP-3. Estos resultados sugieren que Amelx* puede causar distribución anormal de proteínas de unión a amelogenina en el citoplasma de los ameloblastos.
Descritores: Glicoproteínas de Membrana Associadas ao Lisossomo/metabolismo
Amelogenina/metabolismo
Amelogênese Imperfeita
Proteínas de Choque Térmico/metabolismo
-Microscopia Eletrônica de Varredura
Imunofluorescência
Esmalte Dentário/patologia
Proteína 1 de Membrana Associada ao Lisossomo/metabolismo
Amelogenina/genética
Proteína 3 de Membrana Associada ao Lisossomo/metabolismo
Incisivo/patologia
Limites: Animais
Camundongos
Responsável: CL1.1 - Biblioteca Central


  4 / 904 LILACS  
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Id: biblio-984761
Autor: Cataneo, Allan Henrique Depieri; Kuczera, Diogo; Mosimann, Ana Luiza Pamplona; Silva, Emanuele Guimarães; Ferreira, Álvaro Gil Araújo; Marques, João Trindade; Wowk, Pryscilla Fanini; Santos, Claudia Nunes Duarte dos; Bordignon, Juliano.
Título: Detection and clearance of a mosquito densovirus contaminant from laboratory stocks of Zika virus
Fonte: Mem. Inst. Oswaldo Cruz;114:e180432, 2019. tab, graf.
Idioma: en.
Projeto: Ministério da Saúde; . Fundação Araucária; . Fundação Araucária; . SESA-PR; . CNPq; . MS-Decit; . PPSUS; . JTM; . CNDS; . JB; . CNPq; . AHDC; . DK; . CNDS; . JB.
Resumo: BACKGROUND The Zika virus (ZIKV) epidemics that affected South America in 2016 raised several research questions and prompted an increase in studies in the field. The transient and low viraemia observed in the course of ZIKV infection is a challenge for viral isolation from patient serum, which leads to many laboratories around the world sharing viral strains for their studies. C6/36 cells derived from Aedes albopictus larvae are commonly used for arbovirus isolation from clinical samples and for the preparation of viral stocks. OBJECTIVES Here, we report the contamination of two widely used ZIKV strains by Brevidensovirus, here designated as mosquito densovirus (MDV). METHODS Molecular and immunological techniques were used to analyse the MDV contamination of ZIKV stocks. Also, virus passages in mammalian cell line and infecting susceptible mice were used to MDV clearance from ZIKV stocks. FINDINGS MDV contamination was confirmed by molecular and immunological techniques and likely originated from C6/36 cultures commonly used to grow viral stocks. We applied two protocols that successfully eliminated MDV contamination from ZIKV stocks, and these protocols can be widely applied in the field. As MDV does not infect vertebrate cells, we performed serial passages of contaminated stocks using a mammalian cell line and infecting susceptible mice prior to re-isolating ZIKV from the animals' blood serum. MDV elimination was confirmed with immunostaining, polymerase chain reaction (PCR), and analysis of the mosquitoes that were allowed to feed on the infected mice. MAIN CONCLUSIONS Since the putative impact of viral contaminants in ZIKV strains generally used for research purposes is unknown, researchers working in the field must be aware of potential contaminants and test viral stocks to certify sample purity.
Descritores: Cultura de Vírus
Bancos de Espécimes Biológicos
Zika virus
-DNA Viral
Imunofluorescência
Densovirus/genética
Camundongos
Limites: Seres Humanos
Animais
Responsável: BR1.1 - BIREME


  5 / 904 LILACS  
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Id: biblio-954198
Autor: Kobayashi, Hiroto; Takano, Yuta; Yuri, Takuma; Yoshida, Saori; Suzuki, Katsuhiko; Kiyoshige, Yoshiro; Naito, Akira.
Título: Morphological analysis of articularis genus and involvement in muscle synchronicity with vastus intermedius / Análisis morfológico del músculo articular de la rodilla y su participación en la sincronicidad muscular con el músculo vasto intermedio
Fonte: Int. j. morphol;36(3):859-863, Sept. 2018. graf.
Idioma: en.
Projeto: Yamagata University.
Resumo: The articularis genus, which lies under the vastus intermedius, has been regarded as part of the quadriceps femoris. However, they are well known to have different function because their respective origins and insertions are mutually distinct. These muscles are considered to work almost simultaneously when the knee is extended. The electromyogram has been used to demonstrate muscle co-contraction. However, the articularis genus is deeper than other muscles. Moreover, it is difficult to analyze it by surface electromyogram. The relative proportions of muscle fiber types and the characteristics of these fiber types are important determinants of the surface electromyogram. Furthermore, biomechanical analysis of AG has remained unclear. This study investigated the ratio of muscle fiber types in these muscles. Muscle samples from seven human cadaveric specimens were used with application of immunofluorescence double staining. Results show that in the vastus intermedius and articularis genus, the percentage of Type I fibers was significantly higher than that of Type II fibers. No significant difference was found in the mean percentages of Type I and Type II fiber types. The percentages of Type I and Type II fibers in articularis genus muscle were correlated positively to the percentage in the vastus intermedius. These results suggest that similar muscle fiber compositions of these muscles might reflect their contraction during the same active phase of knee extension, despite their different functions.

El músculo articular de la rodilla, que se encuentra cubierto por el músculo vasto intermedio, se ha considerado como parte del músculo cuádriceps femoral. Sin embargo, es sabido que tienen diferentes funciones debido a que sus respectivos orígenes e inserciones son mutuamente distintas. Se considera que estos músculos trabajan de forma casi simultánea cuando la rodilla está extendida. El electromiograma se ha usado para demostrar la contracción muscular. Sin embargo, el músculo articular de la rodillas es más profundo que otros músculos. Además, es difícil analizarlo por electromiograma de superficie. Las proporciones relativas de los tipos de fibras musculares y las características de estos tipos de fibras son importantes determinantes del electromiograma de superficie. Además, el análisis biomecánico de músculo articular de la rodilla no ha sido claro. Este estudio investigó la proporción de tipos de fibras musculares en estos músculos. Se usaron muestras musculares de siete cadáveres humanos con la aplicación de doble tinción de inmunofluorescencia. Los resultados muestran que en los músculos articular de la rodilla y vasto intermedio, el porcentaje de fibras de Tipo I fue significativamente mayor que el de las fibras de Tipo II. No se encontraron diferencias significativas en los porcentajes medios de los Tipo I y Tipo II. Los porcentajes de fibras Tipo I y Tipo II en el músculo articular de la rodilla se correlacionaron positivamente con el porcentaje en el músculo vasto intermediario. Estos resultados sugieren que las composiciones de las fibras musculares similares de estos músculos podrían reflejar su contracción durante la misma fase activa de la extensión de la rodilla, a pesar de sus diferentes funciones.
Descritores: Músculo Esquelético/anatomia & histologia
Fibras Musculares Esqueléticas
Joelho/anatomia & histologia
-Cadáver
Imunofluorescência
Músculo Quadríceps/anatomia & histologia
Limites: Seres Humanos
Masculino
Feminino
Idoso
Idoso de 80 Anos ou mais
Responsável: CL1.1 - Biblioteca Central


  6 / 904 LILACS  
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Id: biblio-954136
Autor: Núñez-R, Daniela; Balboa-P, Natalia; Quilaqueo-P, Nelson; Alvear-Z, Marysol; Paredes-H, Marco.
Título: Evaluación de la actividad inmunomoduladora de extractos metanólicos y de alcaloides de Berberis darwinii H. (Berberidaceae) / Evaluation of the immunomodulatory activity of methanolic extracts and alkaloids of Berberis darwinii H. (Berberidaceae)
Fonte: Int. j. morphol;36(2):454-459, jun. 2018. graf.
Idioma: es.
Projeto: Departamento de Ciencias Básicas, de Ciencias Químicas y Recursos Naturales y al BIOREN de la Universidad de La Frontera; . CONICYT.
Resumo: Berberis darwinii Hook es una especie que habita el sur de Chile y la Patagonia, utilizada por la etnia mapuche para el tratamiento de procesos inflamatorios, estados febriles y dolor de estomacal. El propósito del siguiente estudio fue evaluar in vitro las propiedades del extracto total y de alcaloides de raíz de B. darwinii sobre viabilidad celular y la translocación del factor nuclear NF-kB en línea celular RAW 264.7. Se observó que los extractos no afectan negativamente la viabilidad en las células e inhibieron la translocación del factor nuclear NF-kB asociado a la modulación de la inflamación solo frente al extracto total. Estos resultados indicarían que B. darwinii podría inhibir algunos mecanismos específicos de la defensa celular al modular la translocación de NF- kB.

Berberis darwinii Hook is a species that inhabits southern Chile and Patagonia, used by the Mapuche ethnic group for the treatment of inflammatory processes, febrile states and stomach pain. The purpose of the following study was to evaluate in vitro the properties of the total extract and alkaloids of the root of B. darwinii on cell viability and the translocation of the nuclear factor NF-kB in cell line RAW 264.7. It was observed that the extracts did not negatively affect the viability in the cells and inhibited the translocation of the nuclear factor NF-kB associated with the modulation of inflammation only against the total extract. These results indicate that B. darwinii could inhibit some specific mechanisms of cell defense by modulating the translocation of NF-kB.
Descritores: Extratos Vegetais/farmacologia
NF-kappa B/efeitos dos fármacos
Berberis
Células RAW 264.7/efeitos dos fármacos
-Sobrevivência Celular/efeitos dos fármacos
Imunofluorescência
Raízes de Plantas
Metanol
Alcaloides/farmacologia
Citometria de Fluxo
Fatores Imunológicos/farmacologia
Responsável: CL1.1 - Biblioteca Central


  7 / 904 LILACS  
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Id: biblio-893619
Autor: TANG, Jia; SAITO, Takashi.
Título: Human plasma fibronectin promotes proliferation and differentiation of odontoblast
Fonte: J. appl. oral sci;25(3):299-309, May-June 2017. graf.
Idioma: en.
Projeto: Japanese Society for the Promotion of Science; . Japanese Society for the Promotion of Science.
Resumo: Abstract Objective To assess the effect of fibronectin (Fn) and porcine type I collagen (PCOL) on odontoblast-like cells in vitro. Material and Methods Rat odontoblast-like cells (MDPC-23 cells) were inoculated and cultured on Fn-coated or type I collagen-coated substrates. Proliferation assay, alkaline phosphatase activity (ALP activity), mRNA expression of hard tissue-forming markers, and Alizarin red staining were investigated over a period of 10 days. Results Cells maintained a high proliferation activity on Fn and PCOL even at a low seeding concentration (0.5×104/mL) as demonstrated by CCK-8 assay. The proliferation activity of cells on Fn increases in a concentration-dependent manner while it reached a plateau after 10 µg/mL. Cells adopted long, thin and spindle shape on Fn(10-50) and PCOL. Parallel actin filaments were observed in MDPC-23 cells cultured on Fn and PCOL. ALP activity was markedly up-regulated on Fn and PCOL-coated surfaces. Importantly, gene expression of BSP (Fn10: 2.44±0.32; Fn20: 3.05±0.01; Fn30: 2.90±0.21; Fn40: 2.74±0.30; Fn50: 2.64±0.12; PCOL: 2.20±0.03) and OCN (Fn10: 2.52±0.23; Fn20: 2.28±0.24; Fn30: 2.34±0.21; Fn40: 2.34±0.25; Fn50: 2.20±0.22; PCOL: 1.56±0.16) was significantly enhanced on Fn and PCOL substrates as compared with control; moreover, expression of integrin beta 1 (ITGB1), an ubiquitous cell surface receptor was augmented in Fn(10-50) and PCOL groups simultaneously. In accordance with the ALP activity and gene expression data, calcific deposition in cells grown on Fn(10-50) and PCOL was observed as well. Conclusion Despite the limitation of this study, the findings indicate that a surface coating of Fn enhances the proliferation, differentiation and mineralization of odontoblast-like cells by activation of integrin beta 1 (ITG B1). The promoting effects of Fn on MDPC-23 cells were achieved at a comparatively lower coating concentration than type I collagen (300 µg/mL). Specifically, it is suggested that the optimum coating concentration of Fn to be 10 µg/mL.
Descritores: Diferenciação Celular/efeitos dos fármacos
Fibronectinas/farmacologia
Proliferação Celular/efeitos dos fármacos
Odontoblastos/efeitos dos fármacos
-Fatores de Tempo
Expressão Gênica
Células Cultivadas
Reprodutibilidade dos Testes
Imunofluorescência
Antraquinonas
Integrina beta1/farmacologia
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Colágeno Tipo I/farmacologia
Fosfatase Alcalina/análise
Limites: Seres Humanos
Animais
Ratos
Responsável: BR1.1 - BIREME


  8 / 904 LILACS  
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Id: biblio-888952
Autor: Fu, LC; Lv, Y; Zhong, Y; He, Q; Liu, X; Du, LZ.
Título: Tyrosine phosphorylation of Kv1. 5 is upregulated in intrauterine growth retardation rats with exaggerated pulmonary hypertension
Fonte: Braz. j. med. biol. res = Rev. bras. pesqui. méd. biol;50(11):e6237, 2017. tab, graf.
Idioma: en.
Projeto: National Natural Science Foundation.
Resumo: Intrauterine growth retardation (IUGR) is associated with the development of adult-onset diseases, including pulmonary hypertension. However, the underlying mechanism of the early nutritional insult that results in pulmonary vascular dysfunction later in life is not fully understood. Here, we investigated the role of tyrosine phosphorylation of voltage-gated potassium channel 1.5 (Kv1.5) in this prenatal event that results in exaggerated adult vascular dysfunction. A rat model of chronic hypoxia (2 weeks of hypoxia at 12 weeks old) following IUGR was used to investigate the physiological and structural effect of intrauterine malnutrition on the pulmonary artery by evaluating pulmonary artery systolic pressure and vascular diameter in male rats. Kv1.5 expression and tyrosine phosphorylation in pulmonary artery smooth muscle cells (PASMCs) were determined. We found that IUGR increased mean pulmonary artery pressure and resulted in thicker pulmonary artery smooth muscle layer in 14-week-old rats after 2 weeks of hypoxia, while no difference was observed in normoxia groups. In the PASMCs of IUGR-hypoxia rats, Kv1.5 mRNA and protein expression decreased while that of tyrosine-phosphorylated Kv1.5 significantly increased. These results demonstrate that IUGR leads to exaggerated chronic hypoxia pulmonary arterial hypertension (CH-PAH) in association with decreased Kv1.5 expression in PASMCs. This phenomenon may be mediated by increased tyrosine phosphorylation of Kv1.5 in PASMCs and it provides new insight into the prevention and treatment of IUGR-related CH-PAH.
Descritores: Organofosfatos/metabolismo
Polímeros/metabolismo
Canal de Potássio Kv1.5/análise
Hipóxia Fetal/complicações
Hipóxia Fetal/fisiopatologia
Retardo do Crescimento Fetal/metabolismo
Hipertensão Pulmonar/etiologia
Músculo Liso Vascular/química
-Fosforilação
Efeitos Tardios da Exposição Pré-Natal/metabolismo
Artéria Pulmonar/fisiopatologia
Artéria Pulmonar/patologia
Fatores de Tempo
RNA Mensageiro/análise
Imuno-Histoquímica
Immunoblotting
Distribuição Aleatória
Regulação para Cima
Imunofluorescência
Ratos Sprague-Dawley
Desnutrição/complicações
Modelos Animais de Doenças
Retardo do Crescimento Fetal/etiologia
Reação em Cadeia da Polimerase em Tempo Real
Hipertensão Pulmonar/fisiopatologia
Hipertensão Pulmonar/patologia
Músculo Liso Vascular/patologia
Limites: Animais
Masculino
Feminino
Gravidez
Responsável: BR1.1 - BIREME


  9 / 904 LILACS  
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Labruna, Marcelo Bahia
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Id: biblio-1048085
Autor: Moraes Filho, Jonas; Sousa, Amanda Oliveira de; Carvalho, Tania Regina Vieira de; Labruna, Marcelo Bahia.
Título: Brazilian spotted fever serological survey among equids at the Guarapiranga Dam area in the city of São Paulo, Brazil / Investigação sorológica da febre maculosa brasileira entre equídeos na área da represa de Guarapiranga, na cidade de São Paulo, Brasil
Fonte: Braz. J. Vet. Res. Anim. Sci. (Online);56(4):e158601, Dezembro 03, 2019. mapas, graf.
Idioma: en.
Resumo: In the Guarapiranga dam region located in the metropolitan area of São Paulo, human cases have been reported of Brazilian spotted fever (BSF), a tick-borne disease caused by the bacterium Rickettsia rickettsii. In this area, R. rickettsii is known to be transmitted to humans by Amblyomma aureolatum, a typical dog tick that is not associated with horses. In other BSF-endemic areas, R. rickettsii transmission is associated with Amblyomma sculptum, a tick species that typically infest capybaras and horses. The Guarapiranga Dam bears abundant populations of capybaras and horses. However, since nothing is known about a possible cycle of transmission of R. rickettsii by A. sculptum in this area, this study evaluated such transmission by performing a serosurvey of horses living in the Guarapiranga Dam region. A total of 206 equids living in the margins of the Guarapiranga Dam were serologically tested for antibodies reactive to five Rickettsia species, four of the spotted fever group (R. rickettsii, R. parkeri, R. amblyommatis, R. rhipicephali) and one basal group species, R. bellii. Overall, 171 (83%) equids reacted positively to at least one Rickettsia species. A total of 160 (78%), 123 (60%), 80 (39%), 72 (35%), and 71 (34%), equid sera reacted to R. bellii, R. rickettsii, R. parkeri, R. rhipicephali, and R. amblyommatis, respectively, with endpoint titers ranging from 64 to 1024 for R. bellii, and 64 to 512 for the remaining four Rickettsia species. Endpoint titers to R. bellii (median: 256) was significantly higher (P<0.05) than the endpoint titers to the other four Rickettsia species, for which the median values varied from 64 to 128. A total of 65 (32%) equid sera showed endpoint titers to R. bellii at least 4-fold higher than those to any of the other four antigens, indicating that they have been exposed to R. bellii or a very closely related species. Our results provide serological evidence that the sampled equids were not frequently exposed to R. rickettsii-infected ticks. Since horses are a highly suitable sentinel for R. rickettsii transmission by A. sculptum, we conclude that this tick species has no epidemiological role in the transmission of R. rickettsii in the BSF-endemic area of the Guarapiranga Dam in the metropolitan area of São Paulo.(AU)

Na região da represa de Guarapiranga localizada na área metropolitana de São Paulo, têm sido relatados casos humanos de Febre Maculosa Brasileira (FMB), uma doença transmitida por carrapatos causada pela bactéria Rickettsia rickettsii. Nesta área de estudo, R. rickettsii é conhecida por ser transmitida aos seres humanos pelo Amblyomma aureolatum, um carrapato de cão que não está associado a cavalos. Em outras áreas endêmicas da FMB, a transmissão de R. rickettsii está associada ao Amblyomma sculptum, uma espécie de carrapato que normalmente infesta capivaras e cavalos. A represa de Guarapiranga possui populações abundantes de capivaras e cavalos; no entanto, como nada se sabe sobre um possível ciclo de transmissão de R. rickettsii por A. sculptum nessa área, este estudo avaliou essa transmissão realizando um levantamento sorológico em cavalos que vivem na região da represa de Guarapiranga. Um total de 206 equídeos que vivem nas margens da represa de Guarapiranga foram testados sorologicamente para cinco espécies de Rickettsia, sendo quatro do grupo da FMB (R. rickettsii, R. parkeri, R. amblyommatis, R. rhipicephali) e um do grupo basal (R. bellii). No geral, 171 (83%) equídeos reagiram positivamente a pelo menos uma espécie de Rickettsia. Um total de 160 (78%), 123 (60%), 80 (39%), 72 (35%) e 71 (34%), reagiram a R. bellii, R. rickettsii, R. parkeri, R. rhipicephali e R. amblyommatis, respectivamente, com títulos finais variando de 64 a 1024 para R. bellii e 64 a 512 para as quatro espécies restantes de Rickettsia. Os títulos finais para R. bellii (mediana: 256) foram significativamente maiores (P <0,05) do que os títulos para as outras quatro espécies de Rickettsia, para os quais os valores medianos variaram de 64 a 128. Um total de 65 (32%) equideos, os soros mostraram títulos finais para R. bellii pelo menos quatro vezes maior que os de qualquer um dos outros quatro antígenos, indicando que eles foram expostos a R. bellii ou a uma espécie muito próxima. Os resultados obtidos fornecem evidências sorológicas de que os equídeos amostrados não eram frequentemente expostos a carrapatos infectados por R. rickettsii. Como os cavalos são um sentinela altamente adequado para a transmissão de R. rickettsiipor A. sculptum, a conclusão obtida foi que essa espécie de carrapato não tem papel epidemiológico na transmissão da bactéria na área endêmica de FMB da represa de Guarapiranga na região metropolitana de São Paulo.(AU)
Descritores: Imunofluorescência/veterinária
Cavalos/parasitologia
-Febre Maculosa das Montanhas Rochosas/diagnóstico
Imunofluorescência/métodos
Limites: Animais
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Id: lil-626467
Autor: Oliveira, Taismara S; Bull, Valquíria; Rezende, Carolina A; Furtini, Ronaldo; Costa, Érica A; Paixão, Tatiane A; Santos, Renato L.
Título: Perfil das amostras do sistema nervoso central de bovinos com síndrome neurológica e diagnóstico da raiva bovina no serviço de defesa sanitária de Minas Gerais, 2003-2010 / Profile of central nervous system samples from cattle with neurological syndrome and diagnosis of bovine rabies by the service of sanitary defense of Minas Gerais, 2003-2010
Fonte: Pesqui. vet. bras = Braz. j. vet. res;32(4):333-339, Apr. 2012. ilus, graf, tab.
Idioma: pt.
Resumo: As enfermidades do sistema nervoso central (SNC) são frequentemente relatadas em bovinos no Brasil. Apesar de Minas Gerais ter o segundo maior rebanho bovino do país, há escassez de informações referentes às doenças neurológicas que acometem esses animais. O Laboratório de Saúde Animal do Instituto Mineiro de Agropecuária (LSA/IMA) é o responsável pelo diagnóstico das enfermidades neurológicas dos animais de produção no Estado, com ênfase para a raiva e as encefalopatias espongiformes transmissíveis. Foi realizado um estudo retrospectivo dos dados referentes às amostras de SNC de bovinos com síndrome neurológica avaliadas pelo LSA/IMA de janeiro/2003 a junho/2010, com o objetivo de determinar o perfil das amostras encaminhadas para análise no serviço de defesa sanitária animal, com ênfase no diagnóstico da raiva bovina. Foram consideradas características do animal (sexo, idade, raça e tipo de morte) e da amostra (método de conservação e responsável pela coleta), sendo nas positivas para raiva, avaliada sua composição, assim como as alterações histopatológicas encontradas. Os dados relacionados à frequência de positividade nas diferentes categorias foram submetidos à análise pelo Teste Exato de Fisher. Durante o período avaliado, foram analisadas 3.731 amostras de bovinos com doença neurológica, havendo predomínio de fêmeas e mestiços, o que reflete a composição do rebanho do Estado. O método de conservação foi o principal problema encontrado, sendo apenas 25,89% das amostras encaminhadas em gelo e formol a 10%. Verificou-se uma diminuição gradativa no envio de material para análise. Quanto a raiva bovina diagnosticada no Estado, foram avaliadas 3.703 amostras pela imunofluorescência direta (IFD) e prova biológica (PB), com 41,58% de positividade, sendo dessas 282 submetidas a histopatologia. A frequência de positividade foi influenciada pela raça, idade e tipo de morte do animal. A composição da amostra alterou significativamente o resultado das análises, havendo maior frequência de positividade naquelas compostas por três ou mais fragmentos de SNC, tanto na IFD/PB, quanto na histopatologia. O bulbo, fragmento de eleição para o diagnóstico da EEB, tem sido erroneamente enviado refrigerado e não em formol a 10%. Cerebelo, tálamo, tronco encefálico e medula apresentaram maior frequência de corpúsculos de Negri que cérebro e gânglio trigeminal. O infiltrado inflamatório não supurado foi menos frequente no cérebro, que nos demais fragmentos avaliados. Conclui-se que as amostras de bovinos com síndrome neurológica enviadas ao serviço de defesa sanitária animal de Minas Gerais apresentam características distintas, sendo o método de conservação o principal problema encontrado. Além disso, a raiva bovina diagnosticada na população estudada é influenciada pelas características do animal e da amostra, sendo indicado o envio de diferentes fragmentos do SNC para análise, conservados adequadamente, o que contribui para um diagnóstico mais preciso.(AU)

Diseases of the central nervous system (CNS) are often reported in cattle in Brazil. Although the State of Minas Gerais has the second largest cattle herd in the country, there is little information from this state concerning neurological diseases that affect cattle. The Laboratório de Saúde Animal of the Instituto Mineiro de Agropecuária (LSA/IMA) is in charge of the diagnosis of neurological diseases of livestock in the State, with emphasis on rabies and transmissible spongiform encephalopathies. A retrospective study was conducted on data from cattle with neurologic diseases evaluated by the LSA/IMA from January/2003 to June/2010, aiming to determine the profile of CNS samples sent for analysis, with emphasis on the diagnosis of bovine rabies. Issues related to the animal (sex, age, breed and type of death) as well as to the sample (method of conservation, person in charge the collection, and region of the CNS sampled) were evaluated. Data on frequency of rabies positive samples were analyzed by Fisher's exact test. During the period studied, 3,731 samples from cattle with neurological signs were analyzed, with a predominance of females and crossbred cattle. The method of preservation was the main problem encountered with only 25.89% of samples sent both refrigerated and fixed in 10% formaldehyde. There was a gradual decrease in submission of samples during the course of this study. All 3,703 samples were evaluated by direct fluorescent antibody test (DFA) and biological test (BT) for rabies, 41.58% being positivity for rabies, and 282 of those samples being subjected to histopathology examination. The frequency of positivity was influenced by breed, age, and type of death. Composition of the sample significantly influenced the results, with higher frequency of positivity in samples containing three or more CNS fragments by DFA, BT, or histopathology. The medulla, which is the fragment of choice for diagnosis of BSE, has often been mistakenly submitted under refrigeration, but not in 10% formalin. Cerebellum, thalamus, brain stem, and spinal cord had higher frequency of Negri bodies than the cerebral cortex and trigeminal ganglia. The nonsuppurative inflammatory infiltrate was less frequent in the cerebral cortex than in other CNS fragments. In conclusion, CNS samples from cattle with neurological syndrome sent to the animal health protection service of Minas Gerais are heterogeneous, and the preservation method was the major problem hindering and adequate diagnosis. In addition, diagnosis of rabies was influenced by parameters of the animal as well as the CNS sample. Submission of properly preserved fragments from various segments of the CNS contributes to a more accurate diagnosis of rabies in cattle.(AU)
Descritores: Raiva/diagnóstico
Sistema Nervoso Central/patologia
Preservação de Amostras/prevenção & controle
Imunofluorescência/veterinária
-Técnicas Histológicas/veterinária
Imunidade Materno-Adquirida/imunologia
Limites: Animais
Bovinos
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice



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