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Evaluation biologique de l'inhibition des phosphatases CDC25 dans des lignées d'adenocarcinomes mammaires humains

Abstract : The CDC25 phosphatases are important regulators of eukaryotic cell cycle progression and play a crucial role in the activation of cyclin-dependent kinases (Cdk) by dephosphorylation. CDC25s are attractive targets in cancer therapy because their over-expression was reported in various types of human malignancies, including breast cancer, and this has been correlated with either poor prognosis or tumor aggressiveness.Our study aims to evaluate the CDC25s as interesting targets in breast cancer treatment. This study reports the inhibitory activity of two tetrasulfides : diallyl- (DAS4) and dipropyl- (DPS4) tetrasulfides naturally occurring in garlic and onion, towards the human cell division cycle (CDC) 25 phosphatases. Both compounds have emerged as interesting irreversible inhibitors of the CDC25 isoforms A and C in vitro.Then, we have investigated the anticancer properties of DAS4 et DPS4 on both sensitive (MCF-7 and MDA-MB-231) and resistant (Vcr-R) human breast carcinoma cell lines. Experiments performed on cultured cells have showed that growth of both sensitive and resistant cells was significantly decreased by these tetrasulfides and appeared to be associated with a G2/M cell cycle arrest. In addition, our results also suggested that DAS4 and DPS4 induce apoptotis in MCF-7 cells without affecting reactive oxygen species production. Analysis of mechanisms implicated in apoptosis induction in MCF-7 cells after treatment with DAS4 et DPS4 have suggested the involvement of the Bcl-2 family members. Taken together, these results suggest phosphatases CDC25A and C as possible targets of naturally occuring polysulfides contributing to their anticancer properties.
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Elodie Viry. Evaluation biologique de l'inhibition des phosphatases CDC25 dans des lignées d'adenocarcinomes mammaires humains. Médecine humaine et pathologie. Université Paul Verlaine - Metz, 2010. Français. ⟨NNT : 2010METZ013S⟩. ⟨tel-01752701⟩

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