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<dc:title xml:lang="fr">Synthèse et étude de fluorophores organiques pour la détection de maladies neurodégénératives</dc:title>
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<dc:subject xml:lang="fr">Sondes fluorescentes</dc:subject>
<dc:subject xml:lang="fr">Alzheimer</dc:subject>
<dc:subject xml:lang="fr">BODIPY</dc:subject>
<dc:subject xml:lang="fr">PKC</dc:subject>
<dc:subject xml:lang="fr">Benzazoles</dc:subject>
<dc:subject xml:lang="fr">ESIPT</dc:subject>
<dc:subject xml:lang="fr">Amyloïdes</dc:subject>
<dc:subject xml:lang="en">Fluorescent probes</dc:subject>
<dc:subject xml:lang="en">Alzheimer</dc:subject>
<dc:subject xml:lang="en">BODIPY</dc:subject>
<dc:subject xml:lang="en">PKC</dc:subject>
<dc:subject xml:lang="en">Benzoles</dc:subject>
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<tef:elementdEntree autoriteExterne="034315306" autoriteSource="Sudoc">Protéine kinase C</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ces travaux de thèse concernent la synthèse et l’étude des propriétés optiques de fluorophores organiques appliqués à la détection de deux biomarqueurs de la maladie d’Alzheimer : la protéine kinase C (PKC) et les fibrilles de peptides amyloïdes Aβ42. La détection de la PKC est réalisée à l’aide de dyades comprenant un émetteur de type boradiazaindacène (BODIPY) relié de manière covalente à un inhibiteur de cette enzyme. Ces composés obtenus via une synthèse multi-étape présentent des coefficients d’absorption molaires et des rendements quantiques de fluorescence en solution importants. Ces sondes ont ensuite été utilisées en cytométrie de flux par la société Amoneta Diagnostics afin de détecter la PKC en surface des globules rouges et d’évaluer le potentiel de ces sondes dans le diagnostic de la maladie d’Alzheimer par test sanguin. Pour la détection des fibrilles de peptides amyloïdes, deux séries de fluorophores de la famille des 2-(2’-hydroxyphényl)-benzoxazoles ont été étudiées. Ces molécules présentent un phénomène de transfert de proton intramoléculaire à l’état excité (ESIPT) qui leur confère des propriétés optiques remarquables, telles que d’importants déplacements de Stokes et une émission duale. Enfin, un test de détection in vitro a été mis au point. Une interaction entre ces fluorophores et les fibrilles amyloïdes a pu être observée permettant la détection de ces peptides en solution.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This research concerns the synthesis and photophysical studies of organic fluorescent probes applied to the detection of two Alzheimer’s disease biomarkers: the protein kinase C and fibrils of amyloid Aβ42 peptides. PKC detection is achieved by dyads composed of boradiazaindacene dye (BODIPY) covalently linked to an inhibitor of this enzyme. These compounds afforded by a multistep synthesis display high molar absorption coefficients and quantum yields in solution. These probes were then used in flow cytometry by Amoneta Diagnostics to detect PKC on the surface of red blood cells in order to asses the potential of these molecules for the diagnostic of Alzheimer’s disease by blood test. Two series of fluorophores from the 2-(2’-hydroxyphenyl)-benzazole family have been studied for the detection of amyloid fibrils. These molecules display an excited state intramolecular proton transfer (ESIPT) phenomenon which confer them remarkable optical properties such as important Stokes shifts and dual emission. Finally, an in vitro detection test has been developed. Interactions between these dyes and amyloid fibrils has been observed, allowing the detection of these peptides in solution.</dcterms:abstract>
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