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<dc:title xml:lang="en">Role of the tumor microenvironment in prostate cancer progression</dc:title>
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<dc:subject xml:lang="fr">Cancer de la prostate</dc:subject>
<dc:subject xml:lang="fr">Métastases</dc:subject>
<dc:subject xml:lang="fr">P53</dc:subject>
<dc:subject xml:lang="fr">Résistance à la castration</dc:subject>
<dc:subject xml:lang="fr">Microenvironnement tumoral</dc:subject>
<dc:subject xml:lang="en">Prostate cancer</dc:subject>
<dc:subject xml:lang="en">Metastasis</dc:subject>
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<dc:subject xml:lang="en">Castration resistance</dc:subject>
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<dcterms:abstract xml:lang="fr">Le cancer de la prostate (CaP) est le cancer viscéral le plus fréquent chez l’homme et la deuxième cause de mortalité masculine par cancer. La majorité des décès est causée par les CaP métastatiques car aucun traitement curatif n’existe aujourd’hui pour ces formes. Les gènes PTEN et TP53 sont fréquemment mutés dans des CaP métastatiques et résistants aux traitements. Nos études révèlent que la perte de p53 dans les cellules épithéliales en plus de perte de PTEN conduit à l’acquisition d’une plasticité cellulaire. La mise en place de la plasticité cellulaire requiert un dialogue entre les cellules tumorales et les fibroblastes associés au cancer. De plus, les niches hypoxiques se forment dans le cœur des tumeurs et des neutrophiles immunosuppressifs s’accumulent dans ces niches. L’inhibition du facteur inductible par l’hypoxie HIF1 réduit l’infiltration des neutrophiles dans les tumeurs, ainsi que des monocytes CCR2+ dans le stroma. De plus, ce traitement resensibilise les tumeurs à la déprivation androgénique et éradique les métastases hépatiques. Ainsi, nos travaux identifient plusieurs axes de communication entre les cellules tumorales et le microenvironnement importants pour la dissémination métastatique et la résistance aux traitements, ouvrant sur des nouvelles pistes thérapeutiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Prostate cancer (PCa) is the most common visceral malignancy in males and the second cause of cancer-related deaths. Lethality is mainly caused by metastatic PCa, as there is currently no curative treatment options for those advanced forms. Tumor suppressor genes PTEN and TP53 are frequently mutated in metastatic and treatment-resistant PCa. Our studies reveal that the combined loss of PTEN and p53 in luminal cells leads to cell plasticity and increased metastatic potential. Epithelial cell plasticity is induced by a crosstalk between cancer cells and cancer- associated fibroblasts. In addition, hypoxic niches formed in tumors lead to the accumulation of immunosuppressive neutrophils. Inhibition of hypoxia-inducible factor HIF1a reduces infiltration of neutrophils in tumors, as well as that of CCR2+ monocytes in the stroma. In addition, it resensitizes prostate tumors to androgen deprivation and eradicates metastases. Together, our studies identify multiple axes of communication between tumor cells and their microenvironment that are important in metastatic dissemination and treatment resistance, thus opening new therapeutic possibilities.</dcterms:abstract>
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