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<dc:title xml:lang="fr">Synthèse de groupements protecteurs photolabiles pro-fluorescents sensibles à l’excitation bi-photonique</dc:title>
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<dc:subject xml:lang="fr">Fluorescence</dc:subject>
<dc:subject xml:lang="fr">Uncaging</dc:subject>
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<dcterms:abstract xml:lang="fr">Les groupes protecteurs photolabile (GPP) ont été largement utilisés en synthèse organique et pour des applications biologiques. Parmi la grande diversité de ces groupes, les groupement o-nitrobenzyl sont les plus utilisés. En particulier, ils ont été abondamment employés dans la préparation de nombreux précurseurs photolabiles d’effecteurs biologiques. Ce qui permet d’utiliser une réaction photochimique afin de transformer un composé biologiquement inerte en composé actif avec formation d’un sous-produit de photolyse. Afin de pouvoir quantifier le saut de concentration de l’effecteur biologique en particulier sur des cellules, nous avons développé des nouveaux GPP dérivés d’o-nitrobenzyle, qui libère un sous-produit de photolyse présentant des propriétés de fluorescence. Ainsi en nous basant sur le mécanisme de photolyse de dérivés o-nitrobenzyl sensible à l’excitation bi-photonique, nous avons pu concevoir un GPP non-fluorescent qui libère un fluorophore après photoclivage. Les propriétés de fluorescence du sous-produit de photolyse ont également été optimisées. Enfin à l’aide de ces PPG pro-fluorescent nous avons pu valider que la réaction photolytique peut être suivie par microscopie de fluorescence sur des cellules en culture.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Photoremovable Protecting Groups (PPG) have been widely used in organic synthesis and in various biological applications. Among the wide diversity of these groups, o-nitrobenzyl groups are the mostly used chromophores. In particular, they have been extensively used for the design of caged compounds. Those latter type of compounds are able to release a biological effector together with an uncaging side-product leading to the spatiotemporal control of various biological processes. In order to acutely monitor the uncaging event for example in cells, we developed new PPGs, based on o-nitrobenzylderivatives, able to release a fluorescent side product. Based on the photolytical mechanism of two-photon sensitive o-nitrobenzyl PPGs, we were able to design new non-fluorescent PPGs able to release fluorophores as side products. We were also able to tune the fluorescent properties of the photo-released by product using molecular engineering. Finally, those pro-fluorescent PPGs have been used in order to follow the uncaging events by fluorescent microscopy on cell cultures.</dcterms:abstract>
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