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Function: __construct
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Le cancer colorectal (CCR) est continuellement classé comme l’un des types de cancer les plus accidentels et les plus mortels au monde. Les effets positifs de la chimiothérapie conventionnelle sont fréquemment associés à une toxicité élevée, qui conduit souvent à la suspension du traitement. Des preuves croissantes envisagent l’utilisation de concentrations pharmacologiques d’acide ascorbique (AA), mieux connue sous le nom de vitamine C, dans le traitement du cancer. L'utilisation des AA dans un contexte clinique est essentiellement liée à l'adoption de nouvelles stratégies thérapeutiques basées sur des schémas thérapeutiques combinés, dans lesquels les AA jouent un rôle de chimiosensibilisation. La sensibilité réduite de certaines tumeurs à la chimiothérapie et les effets indésirables fortement associés continuent de constituer l’un des obstacles majeurs au traitement efficace du CCR. Ainsi, cet article visait à étudier le potentiel d’une nouvelle approche thérapeutique contre cette néoplasie avec des effets secondaires réduits pour le patient. Cette approche reposait sur l’étude de l’association de fortes concentrations en AA et de concentrations réduites de médicaments conventionnellement utilisés chez les patients atteints de CCR et éligibles pour les schémas chimiothérapeutiques de première et de deuxième intention, à savoir le 5-fluorouracilo (5-FU), l’oxaliplatine (Oxa) ou irinotécan (Iri). L'évaluation de la synergie potentielle entre les composés a tout d'abord été évaluée in vitro dans trois lignées cellulaires de CRC ayant des antécédents génétiques différents, puis in vivo à l'aide d'un modèle animal de xénogreffe de CRC. Les AA et le 5-FU agissent de manière synergique in vitro juste pendant des durées d'incubation plus longues. Cependant, in vivo n'a montré aucun bénéfice par rapport au 5-FU seul. Contrairement au manque de synergie observé dans les études in vitro associant AA et irinotécan, le modèle animal a révélé le potentiel thérapeutique de cette association. AA a également potentialisé l'effet d'Oxa, puisqu'un effet synergique a été démontré dans presque toutes les conditions et dans les trois lignées cellulaires. De plus, cette thérapie combinée (CT) a provoqué une stagnation du taux de croissance de la tumeur, étant la combinaison testée la plus prometteuse. Les concentrations pharmacologiques d'AA ont augmenté l'efficacité d'Iri et d'Oxa contre le CRC, avec des résultats prometteurs dans des lignées cellulaires présentant des phénotypes plus agressifs, à savoir des tumeurs à expression de P53 mutante ou nulle et des tumeurs résistantes à la chimiothérapie.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30083105