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<dc:title xml:lang="fr">DIfférentes espèces d'acide phosphatidique : localisations subcellulaires et fonctions biologiques spécifiques</dc:title>
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<dc:subject xml:lang="fr">Acide phosphatidique</dc:subject>
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<dc:subject xml:lang="fr">Exocytose</dc:subject>
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<dc:subject xml:lang="en">Phosphatidic acid</dc:subject>
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<tef:elementdEntree autoriteExterne="040759105" autoriteSource="Sudoc.FMesh">Acides phosphatidiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’acide phosphatidique (PA) est un lipide simple qui peut exister sous différentes formes. A partir des sondes que j’ai préparé en se basant sur des domaines de liaison au PA : PDE4A1, Spo20p, et OpiQ2, j’ai pu étudier la localisation subcellulaire du PA dans les cellules PC12 et les macrophages RAW264.7. Ces sondes lient différents formes de PA dans les membranes de différents compartiments subcellulaires. De plus, j’ai pu montrer qu’il y a une néosynthèse de PA et de certaines espèces de PA mono- ou bi-insaturé à la membrane plasmique lors de la stimulation de l’exocytose. Nous avons ainsi observé que la PLD1 semble être la source principale de PA dans les glandes surrénales. D’autre part, mes travaux indiquent une augmentation du niveau global de PA à la membrane plasmique et une diminution importante du PA au niveau du RE dans les macrophages après stimulation de la phagocytose frustrée. Ce qui pourrait ainsi valider le concept d’une fusion d’une partie de la membrane du RE avec la membrane plasmique lors de la phagocytose.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The phosphatidic acid (PA) is a simple lipid which may exist in various forms. I have generated probes based on PA binding domains: PDE4A1, Spo20p and OpiQ2 to study the subcellular localization of PA in PC12 cells and RAW264.7 macrophages. These probes bind different form of PA in different subcellular compartments. In addition, I show that PA and certain species mono- or bi-unsaturated of PA are synthesized at the plasma membrane upon stimulation of exocytosis. We observed that the PLD1 seems to be the main source of PA in the adrenal glands. On the other hand, my research indicates an increase in the level of PA at the plasma membrane and a significant decrease in the ER in macrophages after stimulation of phagocytosis frustrated. Thus these results could validate the concept of a fusion of a portion of the ER membrane with the plasma membrane during phagocytosis.</dcterms:abstract>
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