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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Papel do antagonista Brilliant Blue G sobre os neurônios mioentéricos imunorreativos ao receptor P2X7 do íleo de ratos submetidos à isquemia/reperfusão intestinal. / Role of the Brilliant Blue G antagonist on the myenteric neurons immunoreactive for the P2X7 receptor of the rats ileum following the intestinal ischemia/reperfusion.

Palombit, Kelly 22 August 2014 (has links)
Neste trabalho foram analisados os efeitos do BBG nos neurônios mioentéricos imunorreativos ao receptor P2X7 no íleo de ratos submetidos à isquemia e reperfusão (I/R). A isquemia intestinal foi obtida pela oclusão dos vasos ileais por 45 minutos, com reperfusão de 0 hora (h), 24 h e 14 dias. O BBG foi aplicado nos grupos I/R 24 h e I/R 14 dias nas dosagens de 50 e 100 mg/Kg. O grupo I/R 0 h é o grupo sem reperfusão. Os tecidos foram preparados para análises de duplas marcações, western blotting, histoquímica da mieloperoxidase, histologia e motilidade intestinal. Os resultados demonstraram a presença do receptor P2X7 nos neurônios mioentéricos. Houve uma diminuição da densidade e da área do perfil dos neurônios mioentéricos nos grupos I/R e nos grupos com o BBG houve uma recuperação dos neurônios. Nos grupos I/R houve aumento na expressão do receptor P2X7 e no número de neutrófilos e diminuição da motilidade. Os resultados sugerem que a I/R afetou os neurônios mioentéricos e que o BBG possa ter atenuado os efeitos da I/R, demonstrando uma provável neuroproteção. / We analyzed the effects of BBG antagonist on the P2X7 receptor and rats ileum enteric neurons subjected to I/R. Intestinal ischemia was obtained by ileal vessels obstruction for 45 minutes, followed by reperfusion of 0 h, 24 h and 14 days. The BBG was applied in I/R 24 h and 14 days groups in dosages of 50 and 100 mg/kg. The I/R 0 h is the group without reperfusion. Tissues were prepared by double labeling, western blotting, myeloperoxidase reaction, histology and intestinal motility analyzes. Our results demonstrated the presence of the P2X7 receptor in myenteric neurons. There was a decrease in density and in the area of the cell body profile of the myenteric neurons in the I/R groups and recovery in the BBG groups. In I/R groups there was an increase in the expression of P2X7 receptor and in the number of neutrophils and there was a decrease in intestinal motility and recover in the BBG groups. The results suggest that I/R affect the myenteric neurons and that the BBG may have attenuated the effects of ischemia, thus demonstrating a possible neuroprotection.
2

Estudo do efeito dos antagonistas do receptor P2X7 e Panexina-1 nas células gliais entéricas no protocolo de isquemia e reperfusão intestinal. / Study of the effect of P2X7receptor and Pannexin-1 antagonists on enteric glial cells in the intestinal ischemia and reperfusion protocol.

Mendes, Cristina Eusébio 27 March 2017 (has links)
Evidências indicam uma interação na comunicação glia-neurônio. E sabido que a isquemia e reperfusão intestinal (I/R) são eventos clínicos graves. Este projeto visa estudar os efeitos de Brilliant Blue G (BBG) e de Probenecida (PB) nas células gliais entéricas (CGE). Os vasos ileais foram ocluídos por 45 min. Os períodos de reperfusão foram de 24 h, 14 e 28 dias.Os animais foram tratados com BBG, PB ou Salina. Os dados mostraram que o receptor P2X7 estava em CEG e neurônios, que há fenótipos diferentes de CGE e Panx-1 estava em CEG (GFAP). As densidades mostraram diminuição do número de células-IR ao receptor P2X7, Panx-1 e Hu no grupo I/R Salina, porém nos grupos tratados houve recuperação do número dessas células e com as CGE ocorreu um aumento no grupo I/R Salina. A área do perfil celular apresentou alterações em neurônios e CGE. Houve alterações na expressão proteica de P2X7 e Panx-1 e na atividade contrátil do intestino. O uso de BBG e de PB têm sido eficaz na recuperação de CGE e neurônios e podem ser alvos terapêuticos para doenças do trato gastrintestinal. / Evidence indicates an interaction in glia-neuron communication. It is known that intestinal ischemia and reperfusion (I/R) are serious clinical events. This project aims to study the effects of Brilliant Blue G (BBG) and Probenecida (PB) on enteric glial cells (CGE). The ileal vessels were occluded for 45 min. Reperfusion periods were 24 h, 14 and 28 days. Animals were treated with BBG, PB or Saline. The data showed that the P2X7 receptor was in CEG and neurons, that there are different phenotypes of CGE and Panx-1 was in CEG (GFAP). The densities showed a decrease in the number of cells-IR to the P2X7 receptor, Panx-1 and Hu in the Salina I/R group, but in the treated groups there was a recovery in the number of these cells and with the CGE there was an increase in the Salina I/R group. The cell profile area presented changes in neurons and CGE. There were changes in the protein expression of P2X7 and Panx-1 and in the contractile activity of the intestine. The use of BBG and PB has been effective in the recovery of CGE and neurons may be therapeutic targets for diseases of the gastrointestinal tract.
3

Papel do antagonista Brilliant Blue G sobre os neurônios mioentéricos imunorreativos ao receptor P2X7 do íleo de ratos submetidos à isquemia/reperfusão intestinal. / Role of the Brilliant Blue G antagonist on the myenteric neurons immunoreactive for the P2X7 receptor of the rats ileum following the intestinal ischemia/reperfusion.

Kelly Palombit 22 August 2014 (has links)
Neste trabalho foram analisados os efeitos do BBG nos neurônios mioentéricos imunorreativos ao receptor P2X7 no íleo de ratos submetidos à isquemia e reperfusão (I/R). A isquemia intestinal foi obtida pela oclusão dos vasos ileais por 45 minutos, com reperfusão de 0 hora (h), 24 h e 14 dias. O BBG foi aplicado nos grupos I/R 24 h e I/R 14 dias nas dosagens de 50 e 100 mg/Kg. O grupo I/R 0 h é o grupo sem reperfusão. Os tecidos foram preparados para análises de duplas marcações, western blotting, histoquímica da mieloperoxidase, histologia e motilidade intestinal. Os resultados demonstraram a presença do receptor P2X7 nos neurônios mioentéricos. Houve uma diminuição da densidade e da área do perfil dos neurônios mioentéricos nos grupos I/R e nos grupos com o BBG houve uma recuperação dos neurônios. Nos grupos I/R houve aumento na expressão do receptor P2X7 e no número de neutrófilos e diminuição da motilidade. Os resultados sugerem que a I/R afetou os neurônios mioentéricos e que o BBG possa ter atenuado os efeitos da I/R, demonstrando uma provável neuroproteção. / We analyzed the effects of BBG antagonist on the P2X7 receptor and rats ileum enteric neurons subjected to I/R. Intestinal ischemia was obtained by ileal vessels obstruction for 45 minutes, followed by reperfusion of 0 h, 24 h and 14 days. The BBG was applied in I/R 24 h and 14 days groups in dosages of 50 and 100 mg/kg. The I/R 0 h is the group without reperfusion. Tissues were prepared by double labeling, western blotting, myeloperoxidase reaction, histology and intestinal motility analyzes. Our results demonstrated the presence of the P2X7 receptor in myenteric neurons. There was a decrease in density and in the area of the cell body profile of the myenteric neurons in the I/R groups and recovery in the BBG groups. In I/R groups there was an increase in the expression of P2X7 receptor and in the number of neutrophils and there was a decrease in intestinal motility and recover in the BBG groups. The results suggest that I/R affect the myenteric neurons and that the BBG may have attenuated the effects of ischemia, thus demonstrating a possible neuroprotection.
4

Ultrastructure of the Membrana Limitans Interna after Dye-Assisted Membrane Peeling

Brockmann, Tobias, Steger, Claudia, Westermann, Martin, Nietzsche, Sandor, Königsdörffer, Ekkehart, Strobel, Jürgen, Dawczynski, Jens 27 July 2022 (has links)
The purpose of this study was to investigate the ultrastructure of the membrana limitans interna (internal limiting membrane, ILM) and to evaluate alterations to the retinal cell layers after membrane peeling with vital dyes. Twenty-five patients (25 eyes) who underwent macular hole surgery were included, whereby 12 indocyanine green (ICG)- and 13 brilliant blue G (BBG)-stained ILM were analyzed using light, transmission electron and scanning electron microscopy. Retinal cell fragments on the ILM were identified in both groups using immunohistochemistry. Comparing ICG- and BBG-stained membranes, larger cellular fragments were observed at a higher frequency in the BBG group. Thereby, the findings indicate that ICG permits an enhanced separation of the ILM from the underlying retina with less mechanical destruction. A possible explanation might be seen in the known photosensitivity of ICG, which induces a stiffening and shrinkage of the ILM but also generates retinal toxic metabolites

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