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<dc:title xml:lang="fr">Evaluation et caractérisation des effets anticancéreux de fruits rouges riches en polyphenols dans des modèles de cancer colorectal et de leucémie lymphoïde chronique</dc:title>
<dcterms:alternative xml:lang="en">Anti-cancer properties of berries rich in polyphenols in colorectral cancer models and chronic lymphocytic leukama : evaluation and characterization of the cellular and the molecular mechanisms</dcterms:alternative>
<dc:subject xml:lang="fr">Polyphenols</dc:subject>
<dc:subject xml:lang="fr">Baie</dc:subject>
<dc:subject xml:lang="fr">Cancer colorectal</dc:subject>
<dc:subject xml:lang="fr">Leucémie lymphoïde chronique</dc:subject>
<dc:subject xml:lang="fr">Anticancéreux</dc:subject>
<dc:subject xml:lang="fr">Apoptose</dc:subject>
<dc:subject xml:lang="en">Polyphenols</dc:subject>
<dc:subject xml:lang="en">Berry</dc:subject>
<dc:subject xml:lang="en">Colorectal cancer</dc:subject>
<dc:subject xml:lang="en">Chronic lymphocytic leukemia</dc:subject>
<dc:subject xml:lang="en">Anticancer</dc:subject>
<dc:subject xml:lang="en">Apoptosis</dc:subject>
<dc:subject xml:lang="en">Autophagy</dc:subject>
<dc:subject xml:lang="en">Reactive oxygen species</dc:subject>
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<dcterms:abstract xml:lang="fr">L’évaluation de l’effet cytotoxique de différents jus de fruits naturellement riches en polyphénols vis-à-vis de quatre lignées de cancer colorectal a montré que le jus de la canneberge est particulièrement actif. En effet, les polyphénols de la canneberge induisent l’apoptose associée à une surexpression des deux facteurs de transcription pro-apoptotiques p73 et FOXO3a. Cette mort programmée est aussi associée à une diminution de l’expression de SIRT1 le déacétylateur de protéines non histone telles que p73, KU70, ou FOXO. D’autres événements précoces comme la production de ROS et les dommages à l’ADN connus pour réguler l’expression de SIRT1 ont été confirmés. Une deuxième étude avait pour objectif de valider le potentiel anticancéreux in vivo chez la souris Balb/C injectée de cellules d’adénocarcinome colique murin. Pour cela nous avons choisi le jus d’aronie noire qui a montré in vitro un profil de cytotoxicité intéressant. L’analyse des tumeurs a montré que l’administration de jus d’aronie entraine une réduction de la prolifération des cellules tumorales. Enfin, l’augmentation significative de la mobilité de LC3 suggère l’activation d’une mort cellulaire autophagique. Afin d’évaluer l’utilisation clinique des polyphénols, nous avons évalué les effets cytotoxiques des polyphénols de myrtille sur des lymphocytes, de patients atteints de LLC. Nos résultats montrent que l’extrait polyphénolique induit une apoptose dépendante du stress oxydant et impliquant aussi des protéines pro-apoptotiques dans des cellules de patients atteints de LLC mais pas dans les cellules de sujets sains.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The evaluation of the cytotoxic effect of different fruit juices, naturally rich in polyphenols, on four different colorectal cancer cell lines proved that cranberry juice was the most active. Indeed, cranberry polyphenols induce apoptosis associated with the overexpression of two important proapoptotic transcription factors, p73 and FOXO3a on one hand. Furthermore, it has been also correlated with a decrease in the expression of SIRT1, the deacetylase of several non-histone proteins such as p73, KU70 and FOXO. Other early events such as ROS production and DNA damage, which are known to regulate the expression of SIRT1 were confirmed. The second study aims at validating the potential anticancer effects in an in vivo model of colorectal cancer in BALB/c mice injected subcutaneously of murine colon adenocarcinoma cells. Accordingly, we chose the black chokeberry juice, which showed an interesting cytotoxic profile in vitro. The analysis of tumors demonstrated that the administration of chokeberry juice leads to a reduction in tumor cell proliferation. Finally, the significant increase in the mobility of LC3 suggests the activation of autophagic cell death. To validate the clinical use of polyphenols, we evaluated the cytotoxic effects of blueberry polyphenols on lymphocytes of CLL patients. Our results show that the polyphenolic extract induces an oxidative stress-dependent apoptosis that involve various pro-apoptotic proteins in cells of patients with CLL but not in healthy subjects.</dcterms:abstract>
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