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Ischemic preconditioning allows protecting the endothelium against the irreversible injuries like endothelial dysfunctions caused by ischemial/reperfusion episodes. The aim of this study was to develop an in vitro model of hypoxic preconditioning on Human Umbilical Vein Endothelial Cells (HUVEC) to understand the mechanisms of this protection and to investigate the role of some proteins in the protective effects of hypoxia preconditioning. Leucocytes Jurkats adhesion to the endothelial cells was chosen as read-out. Western blot have been realized to analyze the changes in expression of potential interesting proteins.Our results confirm the fundamental role of HSP90 in protecting HIF-1, ERKl/2 and Akt from proteosomal degradation. It also shows that the endothelial dysfunction caused by hypoxia is a consequence of an alteration in eNOS activation by phosphorylation. Finally, this study allows validating the hypothesis of the ER1l/2 participation in HIF-1 activation which expression seems to be reduced by hypoxic preconditioning. However, the preconditioning model used didn’t show a protective effect of preconditioning. Le préconditionnement ischémique permet de protéger l'endothélium contre les effets délétères de l'ischémie/reperfusion et notamment en prévenant les dysfonctions endothéliales.Le but de cette étude était de développer un modèle in vitro de préconditionnement hypoxique sur des cultures de cellules endothéliales issues de cordons ombilicaux humains (HUVEC) afin de comprendre les mécanismes de cette protection et d'investiguer Je rôle de certaines protéines dans la protection offerte par le préconditionnem ent. Le read-out choisi pour la mise au point de ce modèle était l'adhésion de cellules leucocytaires Jurkats sur les HUVECs. Des analyses expressionnelles des protéines d'intérêt ont été réalisées par Western Blot.Nos résultats confirment le rôle fondamental de la protéine HSP90 dans la protection contre la dégradation de HIF-1, ERKl/2 et d'Akt. Ils démontrent également que la dysfonction endothéliale consécutive à l'hypoxie passe par l'altération de l'activation de eNOS via l'inhibition de sa phosphorylation par Akt. Enfin, cette étude permet de valider l'hypothèse de la participation de ERKl/2 dans l'activation de HIF-l a dont l'expression semble diminuée suite au préconditionnement.Le modèle de préconditionnement hypoxique utilisé ne permet cependant pas d'observer un effet protecteur du préconditionnement.
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Reperfusion Injury --- Kidney --- Ischemia --- Reperfusion --- Free Radicals
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FREE RADICALS --- REPERFUSION INJURY --- KIDNEY --- RABBITS
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Allopurinol --- Reperfusion Injury --- Thoracic Surgery --- Myocardial Reperfusion Injury --- pharmacology --- prevention & control
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Pathological physiology. Pathogenesis --- Reperfusion injury --- Congresses --- Free radicals --- Ion channels
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Intestine, Small --- Graft Survival --- Organ Preservation --- Reperfusion Injury --- transplantation
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FRANCE --- MYOCARDIAL REPERFUSION INJURY --- HISTOIRE CONSTITUTIONNELLE --- CONGRESSES --- 10E-15E SIECLES
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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
Science: general issues --- Pharmacology --- FGF (fibroblast growth factor) --- regeneration --- development --- metabolic regulation --- ischema-reperfusion injury
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Apoptosis --- Chemokines --- Ischemia --- Reperfusion Injury --- Kidney --- drug effects --- metabolism --- physiopathology --- blood supply
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