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<dc:title xml:lang="fr">Amélioration de la préservation du pancréas lors de l’ischémie froide pour l’optimisation de la transplantation d’îlots pancréatiques</dc:title>
<dcterms:alternative xml:lang="en">Improvement of pancreas preservation during cold ischemia in the aim of pancreatic islet transplantation optimisation</dcterms:alternative>
<dc:subject xml:lang="fr">Diabète</dc:subject>
<dc:subject xml:lang="fr">Préservation du pancréas</dc:subject>
<dc:subject xml:lang="fr">Transplantation d’îlots</dc:subject>
<dc:subject xml:lang="fr">Ischémie</dc:subject>
<dc:subject xml:lang="fr">Hypoxie</dc:subject>
<dc:subject xml:lang="fr">Stress oxydant</dc:subject>
<dc:subject xml:lang="en">Diabetes</dc:subject>
<dc:subject xml:lang="en">Pancreas preservation</dc:subject>
<dc:subject xml:lang="en">Islet transplantation</dc:subject>
<dc:subject xml:lang="en">Ischemia</dc:subject>
<dc:subject xml:lang="en">Hypoxia</dc:subject>
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<dcterms:abstract xml:lang="fr">L’ischémie est une des problématiques majeurs de la transplantation, elle intervient au moment de la déconnexion d’un organe du système vasculaire et dure jusqu’à sa reconnexion chez le receveur. Elle provoque une diminution de la qualité des greffons et seulement un-tiers des pancréas éligibles aboutissent à une transplantation. Ce travail de thèse avait pour objectif d’améliorer la qualité des greffons en préparant les pancréas à subir l’ischémie par le préconditionnement et à améliorer leur préservation après avoir identifié les voies impliquées dans l’ischémie. Des changements métaboliques majeurs au niveau de l’organe ont été mis en évidence dépendant du temps d’ischémie, impliquant des dommages sur la partie endocrine du pancréas, les îlots. Ceci a été empêché par le préconditionnement du pancréas à l’ischémie activant les défenses antioxydantes et par l’utilisation de l’hémoglobine M101 issue de ver marin apportant de l’oxygène au cours de la préservation des pancréas de rat et humains. Ainsi, il est possible d’améliorer la qualité des greffons en agissant en amont du prélèvement et au cours de la préservation, ceci permettant une meilleure fonction.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Ischemia is one of the major problems of transplantation, it occurs at the time of disconnection of an organ of the vascular system and lasts until its reconnection in the recipient. It causes a decrease in graft quality and only one-third of the eligible pancreases results in a transplant. This work aimed to improve the quality of the grafts in preparing the pancreas to undergo ischemia preconditioning and improve their preservation after identifying the pathways involved in ischemia. Major metabolic changes in the organ have been demonstrated that appeared to ischemia time dependent enhancing damages to the endocrine part of the pancreas, the islets. This was prevented by the preconditioning of the pancreas to ischemia activating the antioxidant defenses and by the use of the marine worm M101 hemoglobin providing oxygen during the preservation of rat pancreas and humans. Thus, it is possible to improve the quality of the grafts by acting upstream of the sample and during the preservation, this allowing a better function.</dcterms:abstract>
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