• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 11
  • 8
  • 3
  • 2
  • Tagged with
  • 24
  • 24
  • 12
  • 4
  • 4
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 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.
21

Regulation of Multiple Membrane Trafficking Pathways Stimulated by P2X7 Receptor Activation in Inflammatory Macrophages

Qu, Yan January 2009 (has links)
No description available.
22

Estudo do receptor P2X7 nas classes neuronais do íleo de ratos submetidos à isquemia intestinal com reperfusão. / Study of the P2X7 receptor in neurons of the ileum of rats subjected to intestinal ischemia with reperfusion.

Palombit, Kelly 28 June 2010 (has links)
Dor abdominal pode ser consequente a inúmeras causas, entre as várias possibilidades precisamos ficar atentos aos quadros de isquemia intestinal. No trato digestório a isquemia/reperfusão intestinal (I/R-i) acarreta alterações morfológicas nos neurônios entéricos. Este trabalho tem como objetivo analisar o comportamento das diferentes classes neuronais e do receptor P2X7 no plexo mioentérico do íleo de ratos Wistar submetidos à I/R-i. A isquemia intestinal foi obtida pela obstrução do fluxo sanguíneo das artérias ileais no período de 35 minutos, seguida pelos períodos de reperfusão de 6, 24, 72 horas e 1 semana. No grupo sham não houve a oclusão das artérias ileais. Os tecidos foram preparados por métodos imunohistoquímicos de duplas marcações do receptor P2X7 com a Óxido Nítrico Sintase neuronal (NOSn), calbindina (Calb), calretinina (Calr) e Acetilcolina Transferase (ChAT) e do receptor P2X7, da NOSn e da ChAT com o pan-neuronal anti-HuC/D. As análises qualitativas e quantitativas das contagens das duplas marcações, das densidades neuronais e da área dos perfis foram obtidas dos microscópios de fluorescência e de Confocal de Varredura à Laser. Os resultados qualitativos demonstraram diminuição da expressão do receptor P2X7 no grupo I/R-i de 24 horas e retorno da expressão nos grupos I/R-i de 72 horas e 1 semana. Os dados quantitativos demonstraram: a) os neurônios do plexo mioentérico foram imunorreativos ao receptor P2X7; b) não houve alterações significativas nas duplas marcações do receptor P2X7 com os neurônios NOSn-ir, Calr-ir, Calb-ir e ChAT-ir nos grupos sham e I/R-i; c) não houve alterações significativas nas duplas marcações do receptor P2X7, e dos neurônios NOSn-ir e ChAT-ir com o pan-neuronal anti-HuC/D nos grupos sham e I/R-i; d) houve diminuição nas densidades nos grupos I/R-i com 6, 24, 72 horas e 1 semana dos neurônios P2X7-ir, NOSn-ir, Calr-ir, Calb-ir, ChAT-ir e anti-HuC/D-ir quando comparados aos grupos sham; e) houve um aumento na área do perfil dos neurônios NOSn-ir nos grupos I/R-i de 6 e 24 horas, nos neurônios ChAT-ir houve um aumento no grupo I/R-i de 1 semana e nos neurônios Calr-ir houve uma diminuição no grupo I/R-i de 6 horas e um aumento no grupo I/R-i de 24 horas quando comparados aos grupos sham. O presente estudo demonstrou que a I/R-i está associada com a perda significativa de diferentes subpopulações de neurônios do plexo mioentérico acompanhada por diversas alterações morfológicas, o que pode acarretar problemas na motilidade intestinal. / Abdominal pain may be consequent to numerous causes, among the various possibilities need to be attentive to intestinal ischemia. In the digestive tract the intestinal ischemia-reperfusion (I/R-i) causes morphological changes in enteric neurons. The aim of the work was to analyze the behavior of different neurons and P2X7 receptor in the myenteric plexus of the ileum of rats subjected to I/R-i. Intestinal ischemia was obtained by the obstruction of blood flow in the ileal arteries period of 35 minutes followed by reperfusion periods of 6, 24, 72 hours and 1 week. In the sham group there was no occlusion of the ileal arteries. The tissues were prepared by immunohistochemical methods for double staining of P2X7 receptor with neuronal nitric oxide synthase (nNOS), calbindin, calretinin and acetylcholine transferase (ChAT) and P2X7 receptor, the nNOS and ChAT with pan-neuronal marker anti-HuC/D The qualitative and quantitative analysis of the counting of double staining, the neuronal density and the area of the cell body profile were obtained from fluorescence microscopy and confocal scanning laser. The qualitative results showed decreased expression of the P2X7 receptor in I/R-i for 24 hours group and return the expression in I/R-i for 72 hours and 1 week groups. The quantitative data showed: a) neurons in the myenteric plexus were immunoreactive for P2X7 receptor; b) no significant changes in the double staining of P2X7 receptor with nNOS, calretinin, calbindin and ChAT neurons in the sham and I/R-i groups; c) does not significant changes in the double staining of the P2X7 receptor, the nNOS and ChAT neurons with the pan-neuronal marker anti-HuC/D in sham and I/R-i groups; d) the densities of the P2X7 receptor, nNOS-IR, calretinin-IR, calbindin-IR, ChAT-IR and anti-HuC/D-IR neurons were decreased in I/R-i 6, 24, 72 hours and 1 week groups, when compared to sham group; e) the profile area was increased in nNOS-IR neurons in the I/R-i for 6 and 24 hours groups, ChAT-IR neurons in I/R-i 1 week group and in the calretinin-IR neurons there was a decrease in I/R-i 6 hours group and an increase in I/R-i for 24 hours group when compared to sham group. The present study demonstrated that I/R-i is associated with significant loss of different subpopulations of neurons in the myenteric plexus accompanied by several morphological changes, which can cause intestinal motility disorder.
23

Estudo do receptor P2X7 nas classes neuronais do íleo de ratos submetidos à isquemia intestinal com reperfusão. / Study of the P2X7 receptor in neurons of the ileum of rats subjected to intestinal ischemia with reperfusion.

Kelly Palombit 28 June 2010 (has links)
Dor abdominal pode ser consequente a inúmeras causas, entre as várias possibilidades precisamos ficar atentos aos quadros de isquemia intestinal. No trato digestório a isquemia/reperfusão intestinal (I/R-i) acarreta alterações morfológicas nos neurônios entéricos. Este trabalho tem como objetivo analisar o comportamento das diferentes classes neuronais e do receptor P2X7 no plexo mioentérico do íleo de ratos Wistar submetidos à I/R-i. A isquemia intestinal foi obtida pela obstrução do fluxo sanguíneo das artérias ileais no período de 35 minutos, seguida pelos períodos de reperfusão de 6, 24, 72 horas e 1 semana. No grupo sham não houve a oclusão das artérias ileais. Os tecidos foram preparados por métodos imunohistoquímicos de duplas marcações do receptor P2X7 com a Óxido Nítrico Sintase neuronal (NOSn), calbindina (Calb), calretinina (Calr) e Acetilcolina Transferase (ChAT) e do receptor P2X7, da NOSn e da ChAT com o pan-neuronal anti-HuC/D. As análises qualitativas e quantitativas das contagens das duplas marcações, das densidades neuronais e da área dos perfis foram obtidas dos microscópios de fluorescência e de Confocal de Varredura à Laser. Os resultados qualitativos demonstraram diminuição da expressão do receptor P2X7 no grupo I/R-i de 24 horas e retorno da expressão nos grupos I/R-i de 72 horas e 1 semana. Os dados quantitativos demonstraram: a) os neurônios do plexo mioentérico foram imunorreativos ao receptor P2X7; b) não houve alterações significativas nas duplas marcações do receptor P2X7 com os neurônios NOSn-ir, Calr-ir, Calb-ir e ChAT-ir nos grupos sham e I/R-i; c) não houve alterações significativas nas duplas marcações do receptor P2X7, e dos neurônios NOSn-ir e ChAT-ir com o pan-neuronal anti-HuC/D nos grupos sham e I/R-i; d) houve diminuição nas densidades nos grupos I/R-i com 6, 24, 72 horas e 1 semana dos neurônios P2X7-ir, NOSn-ir, Calr-ir, Calb-ir, ChAT-ir e anti-HuC/D-ir quando comparados aos grupos sham; e) houve um aumento na área do perfil dos neurônios NOSn-ir nos grupos I/R-i de 6 e 24 horas, nos neurônios ChAT-ir houve um aumento no grupo I/R-i de 1 semana e nos neurônios Calr-ir houve uma diminuição no grupo I/R-i de 6 horas e um aumento no grupo I/R-i de 24 horas quando comparados aos grupos sham. O presente estudo demonstrou que a I/R-i está associada com a perda significativa de diferentes subpopulações de neurônios do plexo mioentérico acompanhada por diversas alterações morfológicas, o que pode acarretar problemas na motilidade intestinal. / Abdominal pain may be consequent to numerous causes, among the various possibilities need to be attentive to intestinal ischemia. In the digestive tract the intestinal ischemia-reperfusion (I/R-i) causes morphological changes in enteric neurons. The aim of the work was to analyze the behavior of different neurons and P2X7 receptor in the myenteric plexus of the ileum of rats subjected to I/R-i. Intestinal ischemia was obtained by the obstruction of blood flow in the ileal arteries period of 35 minutes followed by reperfusion periods of 6, 24, 72 hours and 1 week. In the sham group there was no occlusion of the ileal arteries. The tissues were prepared by immunohistochemical methods for double staining of P2X7 receptor with neuronal nitric oxide synthase (nNOS), calbindin, calretinin and acetylcholine transferase (ChAT) and P2X7 receptor, the nNOS and ChAT with pan-neuronal marker anti-HuC/D The qualitative and quantitative analysis of the counting of double staining, the neuronal density and the area of the cell body profile were obtained from fluorescence microscopy and confocal scanning laser. The qualitative results showed decreased expression of the P2X7 receptor in I/R-i for 24 hours group and return the expression in I/R-i for 72 hours and 1 week groups. The quantitative data showed: a) neurons in the myenteric plexus were immunoreactive for P2X7 receptor; b) no significant changes in the double staining of P2X7 receptor with nNOS, calretinin, calbindin and ChAT neurons in the sham and I/R-i groups; c) does not significant changes in the double staining of the P2X7 receptor, the nNOS and ChAT neurons with the pan-neuronal marker anti-HuC/D in sham and I/R-i groups; d) the densities of the P2X7 receptor, nNOS-IR, calretinin-IR, calbindin-IR, ChAT-IR and anti-HuC/D-IR neurons were decreased in I/R-i 6, 24, 72 hours and 1 week groups, when compared to sham group; e) the profile area was increased in nNOS-IR neurons in the I/R-i for 6 and 24 hours groups, ChAT-IR neurons in I/R-i 1 week group and in the calretinin-IR neurons there was a decrease in I/R-i 6 hours group and an increase in I/R-i for 24 hours group when compared to sham group. The present study demonstrated that I/R-i is associated with significant loss of different subpopulations of neurons in the myenteric plexus accompanied by several morphological changes, which can cause intestinal motility disorder.
24

Etude de nouveaux biomarqueurs de toxicité induite par des micropolluants (benzo(a)pyrène et phtalate de bis(2-ethylhexyle)) sur des modèles de placenta humain / New biomarkers of toxicity induced by micropollutants (benzo(a)pyrene and di(2-ethylhexyle)phthalate) on human placental models

Wakx, Anaïs 28 November 2014 (has links)
L’exposition prénatale à différents agents toxiques est généralement étudiée en considérant le placenta comme une barrière entre la mère et le fœtus ; nous le considérons en tant qu’organe cible des agents toxiques. Pour ce faire, nous avons sélectionné un modèle cellulaire de trophoblastes adapté aux études toxicologiques. En clinique, des pathologies de la grossesse sont associées à des modifications de la sécrétion de l’hormone placentaire lactogène hPL et de l’hormone gonadotrope chorionique hCG. Nos travaux in vitro ont permis de faire le lien entre une exposition à des micropolluants (le mono(2-ethylhexyl) phtalate, un perturbateur endocrinien, et le benzo(a)pyrene, un carcinogène) et ces observations cliniques. Les biomarqueurs de sécrétion hormonale (hPL et hCG hyperglycosylée) et de dégénérescence (activation du purinorécepteur P2X7) que nous avons identifiés permettent de détecter l’exposition et le risque suite à une exposition à des polluants. / Prenatal exposure to pollutants is commonly evaluated using placenta as a barrier between mother and fetus. Here, we consider placenta as a target organ for toxic agents. To achieve this, we selected a trophoblastic cell model, which is adapted to toxicological studies. In clinical studies, pregnancy pathologies are associated to changes in human placental lactogen (hPL) and human chorionic gonadotropin (hCG) secretions. Our in vitro work links exposure to micropollutants (mono(2-ethylhexyl)phthalate, an endocrine disruptor, and benzo(a)pyrene, a carcinogen) and clinical observations. We identified biomarkers of hormonal secretion (hPL and hyperglycosylated hCG) and degeneration (P2X7 receptor activation), which enable the evaluation of exposure and risk attached to exposure to pollutants.

Page generated in 0.0427 seconds