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<dc:title xml:lang="fr">Caractérisation des interactions protéine - protéine de l’isoforme oncogénique ΔNp73α</dc:title>
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<dc:subject xml:lang="fr">HPV</dc:subject>
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<dc:subject xml:lang="fr">E2F4</dc:subject>
<dc:subject xml:lang="fr">RB</dc:subject>
<dc:subject xml:lang="fr">Interactions protéine-protéine</dc:subject>
<dc:subject xml:lang="fr">Régulation de la transcription</dc:subject>
<dc:subject xml:lang="fr">Cancer</dc:subject>
<dc:subject xml:lang="en">HPV</dc:subject>
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<dcterms:abstract xml:lang="fr">La famille des protéines p53 comprend p53, p63 et p73. Dans 50% des cas de cancers humains, le gène TP53 est altéré, tandis que les cancers avec un gène TP53 normal expriment souvent des isoformes oncogènes des protéines de la famille de p53. Cette thèse se concentre sur l'isoforme ΔNp73α, qui agit comme un inhibiteur dominant négatif de la signalisation p73/p53 dans divers cancers. Ce travail de thèse utilise des kératinocytes humains du prépuce transformés par les oncoprotéines E6 et E7 du papillomavirus humain 38 (38HK) du groupe β. Les 38HK surexpriment ΔNp73α par rapport aux kératinocytes primaires. Dans la première partie, il a été montré que ΔNp73α forme un complexe inhibiteur avec E2F4/p130, réprimant l'expression de gènes, y compris des suppresseurs de tumeur et des facteurs de sénescence. Dans la deuxième partie, l'interaction de ΔNp73α avec PARP14 a été caractérisée, indiquant que les protéines E6/E7 du β-HPV38 augmentent les niveaux de PARP14, qui agirait comme un répresseur de la signalisation p53 en maintenant les niveaux de p53 bas. Cela ouvre de nouvelles perspectives pour l'étude de la dérégulation de p53 par les HPV β et leur impact sur la carcinogenèse.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The p53 protein family includes p53, p63, and p73. In 50% of human cancers, the TP53 gene is genetically altered, while cancers with wild-type TP53 often express oncogenic isoforms of the p53 family proteins. This thesis focuses on ΔNp73α, a highly oncogenic isoform that acts as a dominant-negative inhibitor of p73/p53 signaling in various cancers. In this study we worked with human foreskin keratinocytes transformed by HPV38 oncoproteins E6 and E7 (38HK) as a model system. 38HK cells overexpress ΔNp73α compared to primary keratinocytes. In the first part of the thesis, it was shown that ΔNp73α forms an inhibitory complex with E2F4/p130, repressing the expression of tumor suppressors and senescence factors.The second part focused on the interaction of ΔNp73α with poly(ADP-ribose) polymerase PARP14. Transformation by β-HPV38 E6/E7 increased PARP14 levels, acting as a repressor of p53 signaling and maintaining low p53 levels. This finding offers new insights into p53 deregulation by β-HPVs and their impact on carcinogenesis.</dcterms:abstract>
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