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<dc:title xml:lang="fr">Implication de l'axe CXCL12/CXCR4/CXCR7 dans la dissémination métastatique du cancer colique</dc:title>
<dcterms:alternative xml:lang="en">Implication of the CXCL12/CXCR4/CXCR7 axis in metastatic dissemination of colon cancer</dcterms:alternative>
<dc:subject xml:lang="fr">CXCL12</dc:subject>
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<dc:subject xml:lang="fr">Tumeurs</dc:subject>
<dc:subject xml:lang="fr">Métastases</dc:subject>
<dc:subject xml:lang="fr">CRISPR-Cas9</dc:subject>
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<dcterms:abstract xml:lang="fr">Bien que des stratégies de dépistages et des nouvelles combinaisons de traitements aient été mises en place, la survie des patients présentant des métastases au diagnostic reste encore faible. La chimiokine CXCL12 et ses récepteurs CXCR4 et CXCR7 sont décrits pour leur implication dans plusieurs cancers mais le rôle spécifique de chaque récepteur reste encore à préciser. Pour préciser leur rôle respectif dans la dissémination métastatique du cancer colique, nous avons cherché à invalider les gènes de CXCR4 et/ou CXCR7 par CRISPR-Cas9. Parmi les clones générés, nous avons obtenu des clones ayant perdu totalement ou partiellement l’expression de CXCR4 mais aucun clone invalidé pour CXCR7 ou les deux récepteurs. En étudiant les conséquences fonctionnelles de cette invalidation, nous avons montré qu’in vitro, la perte/baisse de l’expression de CXCR4 n’a pas d’impact sur la prolifération cellulaire, mais elle diminue fortement la migration, l’invasion et la migration trans-endothéliale des cellules. D’autre part, nous avons montré que cette perte/diminution d’expression affecte l’expression de certaines MMP, intégrines, gènes de l’EMT et inhibe l’activation de la Rac1 et de la voie de signalisation associée à Akt et dans une moindre mesure celle associée à Erk1/2. Par ailleurs, in vivo, la perte de CXCR4 diminue fortement la formation de tumeurs caecales et de métastases hépatiques et pulmonaires dans des xénogreffes orthotopiques et intraveineuses chez la souris.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Although screening strategies and new treatment combinations have been developed, the survival of patients with metastatic disease at diagnosis remains poor. The chemokine CXCL12 and its receptors CXCR4 and CXCR7 have been described to be involved in several cancers but the specific role of each receptor remains to be clarified. To precise their respective roles in the metastatic dissemination of colon cancer, we aimed to invalidate the CXCR4 and/or CXCR7 genes by CRISPR-Cas9. Among the clones generated, we obtained clones that totally or partially lost CXCR4 expression, but no clones invalidated for CXCR7 or both receptors. By studying the functional consequences of this invalidation, we showed that in vitro, the loss/decrease of CXCR4 expression does not impact cell proliferation, but it strongly reduces migration, invasion and trans-endothelial migration of cells. Furthermore, we have shown that this loss/decrease of expression affects the expression of certain MMPs, integrins, EMT genes and inhibits the activation of Rac1 and the Akt-associated signaling pathway and to a lesser extent the one related to Erk1/2. Furthermore, in vivo, loss of CXCR4 strongly inhibits caecal tumor formation and liver and lung metastasis in orthotopic and intravenous xenografts in mice.</dcterms:abstract>
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