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<dc:title xml:lang="fr">Sélection et caractérisation de molécules ciblant la protéine de la nucléocapside de VIH-1</dc:title>
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<dc:subject xml:lang="fr">Thérapie du VIH-1</dc:subject>
<dc:subject xml:lang="fr">Résistance aux médicaments</dc:subject>
<dc:subject xml:lang="fr">Protéine de la nucléocapside</dc:subject>
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<dc:subject xml:lang="fr">Criblage</dc:subject>
<dc:subject xml:lang="en">HIV-1 therapy</dc:subject>
<dc:subject xml:lang="en">Drug resistance</dc:subject>
<dc:subject xml:lang="en">Nucleocapsid protein</dc:subject>
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<dcterms:abstract xml:lang="fr">La tri-thérapie utilisée pour le traitement du VIH-1 est efficace mais limitée par l'apparition de résistances. Par conséquent, des cibles virales alternatives sont nécessaires. Une des cibles les plus prometteuses est la protéine nucléocapside (NC), qui est hautement conservée et qui joue un rôle essentiel dans le cycle viral. Dans ce contexte, le projet européen THINPAD a eu pour but de développer des inhibiteurs de la NC en combinant plusieurs approches : criblage virtuel, criblage secondaire in vitro, tests antiviraux et de toxicité. Pour le criblage in vitro, nous avons utilisé le test de déstabilisation de cTAR, hautement spécifique de l’activité chaperonne de NC. Cinq séries de molécules ont été sélectionnées par les premiers criblages et tests antiviraux. Après des études de relation structure-activité, une seule des cinq séries a été poursuivie jusqu’aux tests d'efficacité chez les souris. Les composés de cette série présentent une activité antivirale à des concentrations nanomolaires, mais ne sont pas actifs dans le modèle murin. Les études de mécanisme d'action ont révélés que leur activité antivirale était bien consécutive au ciblage de la NC.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Highly Active Anti-Retroviral Therapy (HAART) is successfully used for HIV-1 treatment, but is hampered by the appearance of drug resistance. Thereby, alternative drug targets are required. One of the most promising target is the nucleocapsid protein (NC), which is highly conserved and plays essential role in HIV life cycle. In this context, the European project THINPAD was organized with the aim to develop NC inhibitors. To fulfil this objective, several approaches were used, including virtual screening, in vitro secondary screening, in cellulo antivirals tests, and toxicity evaluation. For in vitro screening, the specific NC-promoted cTAR destabilization assay was used. Five series of molecules were selected by the first screenings and antiviral tests. After structure-activity relationship studies, only one series was continued until efficacy testing in mice. The compounds of this series exhibit antiviral activity at nanomolar concentrations but are not active in the murine model. The mechanisms of action studies revealed that their antiviral activity was indeed consecutive to the targeting of the NC.</dcterms:abstract>
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