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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.
41

Decoding protein networks during porcine epidemic diarrhea virus (PEDV) infection through proteomics

Valle-Tejada, Camila Andrea 07 1900 (has links)
No description available.
42

Elucidating the Molecular and Cellular Mechanism Underlying Cancer Cachexia

He, Wei January 2013 (has links)
No description available.
43

Mechanisms of Anti-Angiogenic Signaling by CD36

Ramakrishnan, Devi Prasadh 13 February 2015 (has links)
No description available.
44

Estudo sobre as respostas inflamatórias em modelo experimental de artrite séptica induzida por Staphylococcus aureus e suas vesículas / Study of inflammatory responses in experimental staphylococcal septic arthritis model induced by Staphylococcus aureus and extracellular vesicles

Farah Fatima 06 March 2018 (has links)
A artrite séptica (AS), também chamada de artrite infecciosa, é uma doença inflamatória das articulações iniciada por um agente infeccioso. O agente causal mais comum da SA é Staphylococcus aureus (S. aureus). A patogênese da SA inclui uma resposta inflamatória complexa envolvendo sistema imune inato e adaptativo. As citocinas liberadas a partir de macrófagos, tais como TNF-?, IL-1? e IL-6, foram classicamente apontadas como os principais mediadores da inflamação grave que precede a destruição da cartilagem e osso e a disfunção articular permanente mediante a AS. A evidência radiológica está frequentemente presente, mas não diferencia o afrouxamento mecânico do septo das articulações. Portanto, se houver algum indício de suspeita de infecção, deve ser aspirado para avaliação microbiológica. Recentemente, as tecnologias de imagem como a micro tomografia computadorizada (?CT) foram amplamente utilizadas para modelos pré-clínicos de distúrbios articulares auto-imunes. No entanto, as características radiológicas da AS em camundongos ainda são amplamente desconhecidas. No estudo atual, os camundongos NMRI foram inoculados intravenosamente ou intra-articularmente com a cepas de S. aureus Newman ou LS-1. Os sinais radiológicos e clínicos da artrite séptica foram acompanhados durante 10 dias usando ?CT. Avaliamos as correlações entre alterações radiológicas conjuntas e sinais clínicos, alterações histológicas e níveis séricos de citocinas. Nos dias 5-7 após a infecção intravenosa, a destruição óssea verificada por ?CT tornou-se evidente na maioria das articulações infectadas. Os sinais radiológicos de destruição óssea eram dependentes da dose bacteriana. O local mais comumente afetado pela artrite séptica foi o fêmur distal nos joelhos. A destruição óssea detectada pelo ?CT foi correlacionada positivamente com alterações histológicas na artrite séptica local e hematogênica. Os níveis séricos de IL-6 foram significativamente correlacionados com a gravidade da destruição das articulações. Coletivamente, nossos dados mostram que o ?CT é um método sensível para monitorar a progressão da doença e determinar a gravidade da destruição óssea em um modelo de artrite séptica do mouse; enquanto que a IL-6 é um potencial biomarcador de destruição óssea na artrite séptica. / Extracellular vesicles (EVs) are heterogeneous population of nano- and micro-sized vesicles secreted from almost every cell type. The process of EV secretion seems to be evolutionary conserved across the species kingdoms, ranging from simple prokaryotes to higher eukaryotes including bacteria, viruses, and parasitic protozoa such as leishmania and malarial parasites, fungi, plants and animals. Recent data suggests that Staphylococcus aureus (S. aureus) bacteria secretes EVs that could mediate host-pathogen interactions. EVs have been investigated in various bacterial species which modulate the secretion of immunoregulatory molecules such as cytokines and may have key role in infection. However, their role in S. aureus septic arthritis has not been explored yet. In current study, we postulate novel perspectives for the implementation of S. aureus-derived EVs in vitro as well as in vivo model of septic arthritis. EVs derived from S. aureus were applied to stimulate mice splenocytes in vitro as well as intra-articularly and the cytokine levels were measured. Our results showed that S. aureus derived EVs potentially provoke the production of proinflammatory cytokines. TNF-?, and IL-6 were significantly elevated in splenocytes in vitro after EV-based stimulation. Moreover, NMRI mice were injected with variable doses of EVs intraarticularly and mice were observed for 10 days to examine inflammation and development of septic arthritis. Bone and cartilage destruction was assessed by histochemistry analysis to score the joint erosion. Altogether, our results demonstrate the putative role of S. aureus-derived EVs in provoking inflammation and immunological responses suggesting that these vesicles could induce and disseminate systemic immune response during the development of septic arthritis.
45

Estudo sobre as respostas inflamatórias em modelo experimental de artrite séptica induzida por Staphylococcus aureus e suas vesículas / Study of inflammatory responses in experimental staphylococcal septic arthritis model induced by Staphylococcus aureus and extracellular vesicles

Fatima, Farah 06 March 2018 (has links)
A artrite séptica (AS), também chamada de artrite infecciosa, é uma doença inflamatória das articulações iniciada por um agente infeccioso. O agente causal mais comum da SA é Staphylococcus aureus (S. aureus). A patogênese da SA inclui uma resposta inflamatória complexa envolvendo sistema imune inato e adaptativo. As citocinas liberadas a partir de macrófagos, tais como TNF-?, IL-1? e IL-6, foram classicamente apontadas como os principais mediadores da inflamação grave que precede a destruição da cartilagem e osso e a disfunção articular permanente mediante a AS. A evidência radiológica está frequentemente presente, mas não diferencia o afrouxamento mecânico do septo das articulações. Portanto, se houver algum indício de suspeita de infecção, deve ser aspirado para avaliação microbiológica. Recentemente, as tecnologias de imagem como a micro tomografia computadorizada (?CT) foram amplamente utilizadas para modelos pré-clínicos de distúrbios articulares auto-imunes. No entanto, as características radiológicas da AS em camundongos ainda são amplamente desconhecidas. No estudo atual, os camundongos NMRI foram inoculados intravenosamente ou intra-articularmente com a cepas de S. aureus Newman ou LS-1. Os sinais radiológicos e clínicos da artrite séptica foram acompanhados durante 10 dias usando ?CT. Avaliamos as correlações entre alterações radiológicas conjuntas e sinais clínicos, alterações histológicas e níveis séricos de citocinas. Nos dias 5-7 após a infecção intravenosa, a destruição óssea verificada por ?CT tornou-se evidente na maioria das articulações infectadas. Os sinais radiológicos de destruição óssea eram dependentes da dose bacteriana. O local mais comumente afetado pela artrite séptica foi o fêmur distal nos joelhos. A destruição óssea detectada pelo ?CT foi correlacionada positivamente com alterações histológicas na artrite séptica local e hematogênica. Os níveis séricos de IL-6 foram significativamente correlacionados com a gravidade da destruição das articulações. Coletivamente, nossos dados mostram que o ?CT é um método sensível para monitorar a progressão da doença e determinar a gravidade da destruição óssea em um modelo de artrite séptica do mouse; enquanto que a IL-6 é um potencial biomarcador de destruição óssea na artrite séptica. / Extracellular vesicles (EVs) are heterogeneous population of nano- and micro-sized vesicles secreted from almost every cell type. The process of EV secretion seems to be evolutionary conserved across the species kingdoms, ranging from simple prokaryotes to higher eukaryotes including bacteria, viruses, and parasitic protozoa such as leishmania and malarial parasites, fungi, plants and animals. Recent data suggests that Staphylococcus aureus (S. aureus) bacteria secretes EVs that could mediate host-pathogen interactions. EVs have been investigated in various bacterial species which modulate the secretion of immunoregulatory molecules such as cytokines and may have key role in infection. However, their role in S. aureus septic arthritis has not been explored yet. In current study, we postulate novel perspectives for the implementation of S. aureus-derived EVs in vitro as well as in vivo model of septic arthritis. EVs derived from S. aureus were applied to stimulate mice splenocytes in vitro as well as intra-articularly and the cytokine levels were measured. Our results showed that S. aureus derived EVs potentially provoke the production of proinflammatory cytokines. TNF-?, and IL-6 were significantly elevated in splenocytes in vitro after EV-based stimulation. Moreover, NMRI mice were injected with variable doses of EVs intraarticularly and mice were observed for 10 days to examine inflammation and development of septic arthritis. Bone and cartilage destruction was assessed by histochemistry analysis to score the joint erosion. Altogether, our results demonstrate the putative role of S. aureus-derived EVs in provoking inflammation and immunological responses suggesting that these vesicles could induce and disseminate systemic immune response during the development of septic arthritis.
46

IFN-Gamma-Mediated Immunoevasive Strategies in Multiple Myeloma

Ciarlariello, Paul David 08 August 2016 (has links)
No description available.
47

Implication des vésicules extracellulaires des cellules initiatrices tumorales dans l’augmentation de la perméabilité vasculaire du glioblastome / The implication of cancer stem-like cell derived extracellular vesicle in glioblastoma vascular permeability increase

Treps, Lucas 02 September 2015 (has links)
Les capillaires cérébraux sont caractérisés par une structure et une organisation particulière au sein de l’unité neurovasculaire. Au travers de jonctions endothéliales particulièrement sélectives, la barrière hémato-encéphalique (BHE) orchestre les échanges de cellules, fluides, protéines et métabolites plasmatiques entre le sang et le compartiment cérébral. La VE-cadhérine, protéine transmembranaire des jonctions endothéliales, est particulièrement importante dans l’intégrité vasculaire puisque sa déstabilisation entraine un affaiblissement de la BHE et conduit à sa rupture dans certaines pathologies. Le glioblastome est une tumeur cérébrale extrêmement agressive et associée à un haut degré de vascularisation dont la perméabilité est anormalement élevée. Ceci contribue à la formation d’œdèmes vasculaires péri-tumoraux préjudiciables pour la santé du patient. Depuis la dernière décennie, un grand nombre d’études ont relié la présence d’une sous-population de cellules souches gliomateuses (CSG) à l’initiation, la récurrence et l’agressivité du glioblastome. De façon importante, ces CSG sont localisées dans un microenvironnement particulier, appelé niche vasculaire, dans lequel elles communiquent étroitement et échangent de manière bidirectionnelle avec l’endothélium cérébral. Sur la base d’un modèle de coculture entre CSG issues de patients, et cellules endothéliales cérébrales récapitulant les propriétés de la BHE, notre laboratoire a porté son attention sur la Sémaphorine 3A (Séma3A). Cette protéine est en effet sécrétée par les CSG et exerce, via son corécepteur Neuropiline-1 (Nrp-1), une action positive sur la perméabilité vasculaire par déstabilisation de la VE-cadhérine. Durant mes travaux de thèse, nous avons identifié et caractérisé la présence de la Séma3A à la membrane de vésicules extracellulaires (EV) produites par les CSG. Un nombre grandissant d’études met en exergue l’implication de ces vésicules dans la biologie tumorale. Dans ce sens, nous avons démontré que les EV des CSG peuvent pénétrer dans les cellules endothéliales, et moduler leurs propriétés intrinsèques. Au travers de modèles in vivo originaux et de la combinaison de stratégies génétiques (ARN interférent) et pharmacologiques (anticorps bloquant humanisés), nous avons d’une part montré que la Séma3A, portée par les EV, agit spécifiquement via la Nrp-1 exprimée par les cellules endothéliales afin d’augmenter leur perméabilité. D’autre part, dans un modèle de xénogreffe orthotopique de CSG, nous avons identifié une augmentation significative du taux de Séma3A dans la fraction de EV circulantes. De manière intéressante, des résultats similaires ont été obtenus à partir de prélèvements de patients glioblastome nouvellement diagnostiqués. La Séma3A de ces vésicules, apte à augmenter la perméabilité vasculaire à distance, in vitro et in vivo au travers de la Nrp-1, représenterait donc un bon candidat en tant que futur marqueur théranostique du glioblastome. / Brain microvessels are characterized by specific structure and organization within the neurovascular unit. Through highly selective endothelial junctions, the blood-brain barrier (BBB) controls exchanges of cells, fluids, plasmatic proteins and metabolites between blood and the cerebral compartment. VE-cadherin, a transmembrane protein of endothelial junctions, is of most importance in the vascular integrity. Indeed, its destabilization leads to BBB weakening and also breaking in some pathology. Glioblastoma is a highly aggressive brain tumour characterized by a high vascularization rate and abnormal vascular permeability. These properties promote in turn perivascular œdema, harmful for the patient. Since the last decade, a growing number of studies link glioblastoma stem-like cell (GSC) population to the initiation, recurrence and aggressiveness of such cancer. Interestingly, GSCs are located within the vascular niche, a specific microenvironment where they survive, communicate and exchange factors with the microvascular endothelium. On the base of a coculture model between patient-derived GSCs and brain microvascular endothelial cells which recapitulate BBB properties, our laboratory has focused on Semaphorin 3A (Sema3A). Sema3A is a GSC secreted protein and acts through its coreceptor Neuropilin-1 (Nrp-1) which in turn destabilizes VE-cadherin and promotes vascular permeability. During my thesis, we have identified and characterized Sema3A at the membrane of GSC secreted extracellular vesicles (EVs). A growing number of studies highlight EVs as important actors of tumour biology, in this way we have demonstrated that GSC-derived EVs can be uptake by endothelial cells and modulate their intrinsic properties. Through original in vivo models in combination with genetic (RNA interference) and pharmacologic strategies (humanised blocking antibodies), we have demonstrated that EV-carried Sema3A acts specifically through endothelial cells Nrp-1 to promote permeability. Furthermore, in orthotopic GSC xenograft we have identified a significant increase in the Sema3A EV-fraction collected from peripheral blood. Interestingly, similar results were obtained from newly diagnosed glioblastoma blood samples. Moreover, Sema3A from this fraction is a potent propermeability factor that can act at distance through Nrp-1 both in vitro and in vivo. Altogether, our results suggest that EV-carried Sema3A orchestrates loss of barrier integrity in glioblastoma and may be of interest for prognostic purposes.
48

Implication des vésicules extracellulaires des cellules initiatrices tumorales dans l’augmentation de la perméabilité vasculaire du glioblastome / The implication of cancer stem-like cell derived extracellular vesicle in glioblastoma vascular permeability increase

Treps, Lucas 02 September 2015 (has links)
Les capillaires cérébraux sont caractérisés par une structure et une organisation particulière au sein de l’unité neurovasculaire. Au travers de jonctions endothéliales particulièrement sélectives, la barrière hémato-encéphalique (BHE) orchestre les échanges de cellules, fluides, protéines et métabolites plasmatiques entre le sang et le compartiment cérébral. La VE-cadhérine, protéine transmembranaire des jonctions endothéliales, est particulièrement importante dans l’intégrité vasculaire puisque sa déstabilisation entraine un affaiblissement de la BHE et conduit à sa rupture dans certaines pathologies. Le glioblastome est une tumeur cérébrale extrêmement agressive et associée à un haut degré de vascularisation dont la perméabilité est anormalement élevée. Ceci contribue à la formation d’œdèmes vasculaires péri-tumoraux préjudiciables pour la santé du patient. Depuis la dernière décennie, un grand nombre d’études ont relié la présence d’une sous-population de cellules souches gliomateuses (CSG) à l’initiation, la récurrence et l’agressivité du glioblastome. De façon importante, ces CSG sont localisées dans un microenvironnement particulier, appelé niche vasculaire, dans lequel elles communiquent étroitement et échangent de manière bidirectionnelle avec l’endothélium cérébral. Sur la base d’un modèle de coculture entre CSG issues de patients, et cellules endothéliales cérébrales récapitulant les propriétés de la BHE, notre laboratoire a porté son attention sur la Sémaphorine 3A (Séma3A). Cette protéine est en effet sécrétée par les CSG et exerce, via son corécepteur Neuropiline-1 (Nrp-1), une action positive sur la perméabilité vasculaire par déstabilisation de la VE-cadhérine. Durant mes travaux de thèse, nous avons identifié et caractérisé la présence de la Séma3A à la membrane de vésicules extracellulaires (EV) produites par les CSG. Un nombre grandissant d’études met en exergue l’implication de ces vésicules dans la biologie tumorale. Dans ce sens, nous avons démontré que les EV des CSG peuvent pénétrer dans les cellules endothéliales, et moduler leurs propriétés intrinsèques. Au travers de modèles in vivo originaux et de la combinaison de stratégies génétiques (ARN interférent) et pharmacologiques (anticorps bloquant humanisés), nous avons d’une part montré que la Séma3A, portée par les EV, agit spécifiquement via la Nrp-1 exprimée par les cellules endothéliales afin d’augmenter leur perméabilité. D’autre part, dans un modèle de xénogreffe orthotopique de CSG, nous avons identifié une augmentation significative du taux de Séma3A dans la fraction de EV circulantes. De manière intéressante, des résultats similaires ont été obtenus à partir de prélèvements de patients glioblastome nouvellement diagnostiqués. La Séma3A de ces vésicules, apte à augmenter la perméabilité vasculaire à distance, in vitro et in vivo au travers de la Nrp-1, représenterait donc un bon candidat en tant que futur marqueur théranostique du glioblastome. / Brain microvessels are characterized by specific structure and organization within the neurovascular unit. Through highly selective endothelial junctions, the blood-brain barrier (BBB) controls exchanges of cells, fluids, plasmatic proteins and metabolites between blood and the cerebral compartment. VE-cadherin, a transmembrane protein of endothelial junctions, is of most importance in the vascular integrity. Indeed, its destabilization leads to BBB weakening and also breaking in some pathology. Glioblastoma is a highly aggressive brain tumour characterized by a high vascularization rate and abnormal vascular permeability. These properties promote in turn perivascular œdema, harmful for the patient. Since the last decade, a growing number of studies link glioblastoma stem-like cell (GSC) population to the initiation, recurrence and aggressiveness of such cancer. Interestingly, GSCs are located within the vascular niche, a specific microenvironment where they survive, communicate and exchange factors with the microvascular endothelium. On the base of a coculture model between patient-derived GSCs and brain microvascular endothelial cells which recapitulate BBB properties, our laboratory has focused on Semaphorin 3A (Sema3A). Sema3A is a GSC secreted protein and acts through its coreceptor Neuropilin-1 (Nrp-1) which in turn destabilizes VE-cadherin and promotes vascular permeability. During my thesis, we have identified and characterized Sema3A at the membrane of GSC secreted extracellular vesicles (EVs). A growing number of studies highlight EVs as important actors of tumour biology, in this way we have demonstrated that GSC-derived EVs can be uptake by endothelial cells and modulate their intrinsic properties. Through original in vivo models in combination with genetic (RNA interference) and pharmacologic strategies (humanised blocking antibodies), we have demonstrated that EV-carried Sema3A acts specifically through endothelial cells Nrp-1 to promote permeability. Furthermore, in orthotopic GSC xenograft we have identified a significant increase in the Sema3A EV-fraction collected from peripheral blood. Interestingly, similar results were obtained from newly diagnosed glioblastoma blood samples. Moreover, Sema3A from this fraction is a potent propermeability factor that can act at distance through Nrp-1 both in vitro and in vivo. Altogether, our results suggest that EV-carried Sema3A orchestrates loss of barrier integrity in glioblastoma and may be of interest for prognostic purposes.
49

Implication des vésicules extracellulaires des cellules initiatrices tumorales dans l’augmentation de la perméabilité vasculaire du glioblastome / The implication of cancer stem-like cell derived extracellular vesicle in glioblastoma vascular permeability increase

Treps, Lucas 02 September 2015 (has links)
Les capillaires cérébraux sont caractérisés par une structure et une organisation particulière au sein de l’unité neurovasculaire. Au travers de jonctions endothéliales particulièrement sélectives, la barrière hémato-encéphalique (BHE) orchestre les échanges de cellules, fluides, protéines et métabolites plasmatiques entre le sang et le compartiment cérébral. La VE-cadhérine, protéine transmembranaire des jonctions endothéliales, est particulièrement importante dans l’intégrité vasculaire puisque sa déstabilisation entraine un affaiblissement de la BHE et conduit à sa rupture dans certaines pathologies. Le glioblastome est une tumeur cérébrale extrêmement agressive et associée à un haut degré de vascularisation dont la perméabilité est anormalement élevée. Ceci contribue à la formation d’œdèmes vasculaires péri-tumoraux préjudiciables pour la santé du patient. Depuis la dernière décennie, un grand nombre d’études ont relié la présence d’une sous-population de cellules souches gliomateuses (CSG) à l’initiation, la récurrence et l’agressivité du glioblastome. De façon importante, ces CSG sont localisées dans un microenvironnement particulier, appelé niche vasculaire, dans lequel elles communiquent étroitement et échangent de manière bidirectionnelle avec l’endothélium cérébral. Sur la base d’un modèle de coculture entre CSG issues de patients, et cellules endothéliales cérébrales récapitulant les propriétés de la BHE, notre laboratoire a porté son attention sur la Sémaphorine 3A (Séma3A). Cette protéine est en effet sécrétée par les CSG et exerce, via son corécepteur Neuropiline-1 (Nrp-1), une action positive sur la perméabilité vasculaire par déstabilisation de la VE-cadhérine. Durant mes travaux de thèse, nous avons identifié et caractérisé la présence de la Séma3A à la membrane de vésicules extracellulaires (EV) produites par les CSG. Un nombre grandissant d’études met en exergue l’implication de ces vésicules dans la biologie tumorale. Dans ce sens, nous avons démontré que les EV des CSG peuvent pénétrer dans les cellules endothéliales, et moduler leurs propriétés intrinsèques. Au travers de modèles in vivo originaux et de la combinaison de stratégies génétiques (ARN interférent) et pharmacologiques (anticorps bloquant humanisés), nous avons d’une part montré que la Séma3A, portée par les EV, agit spécifiquement via la Nrp-1 exprimée par les cellules endothéliales afin d’augmenter leur perméabilité. D’autre part, dans un modèle de xénogreffe orthotopique de CSG, nous avons identifié une augmentation significative du taux de Séma3A dans la fraction de EV circulantes. De manière intéressante, des résultats similaires ont été obtenus à partir de prélèvements de patients glioblastome nouvellement diagnostiqués. La Séma3A de ces vésicules, apte à augmenter la perméabilité vasculaire à distance, in vitro et in vivo au travers de la Nrp-1, représenterait donc un bon candidat en tant que futur marqueur théranostique du glioblastome. / Brain microvessels are characterized by specific structure and organization within the neurovascular unit. Through highly selective endothelial junctions, the blood-brain barrier (BBB) controls exchanges of cells, fluids, plasmatic proteins and metabolites between blood and the cerebral compartment. VE-cadherin, a transmembrane protein of endothelial junctions, is of most importance in the vascular integrity. Indeed, its destabilization leads to BBB weakening and also breaking in some pathology. Glioblastoma is a highly aggressive brain tumour characterized by a high vascularization rate and abnormal vascular permeability. These properties promote in turn perivascular œdema, harmful for the patient. Since the last decade, a growing number of studies link glioblastoma stem-like cell (GSC) population to the initiation, recurrence and aggressiveness of such cancer. Interestingly, GSCs are located within the vascular niche, a specific microenvironment where they survive, communicate and exchange factors with the microvascular endothelium. On the base of a coculture model between patient-derived GSCs and brain microvascular endothelial cells which recapitulate BBB properties, our laboratory has focused on Semaphorin 3A (Sema3A). Sema3A is a GSC secreted protein and acts through its coreceptor Neuropilin-1 (Nrp-1) which in turn destabilizes VE-cadherin and promotes vascular permeability. During my thesis, we have identified and characterized Sema3A at the membrane of GSC secreted extracellular vesicles (EVs). A growing number of studies highlight EVs as important actors of tumour biology, in this way we have demonstrated that GSC-derived EVs can be uptake by endothelial cells and modulate their intrinsic properties. Through original in vivo models in combination with genetic (RNA interference) and pharmacologic strategies (humanised blocking antibodies), we have demonstrated that EV-carried Sema3A acts specifically through endothelial cells Nrp-1 to promote permeability. Furthermore, in orthotopic GSC xenograft we have identified a significant increase in the Sema3A EV-fraction collected from peripheral blood. Interestingly, similar results were obtained from newly diagnosed glioblastoma blood samples. Moreover, Sema3A from this fraction is a potent propermeability factor that can act at distance through Nrp-1 both in vitro and in vivo. Altogether, our results suggest that EV-carried Sema3A orchestrates loss of barrier integrity in glioblastoma and may be of interest for prognostic purposes.

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