Intérêt de l’utilisation de stratégies anti-métaboliques pour le traitement du cancer du sein

Abstract : Breast cancer is the most common cancer in women. Despite therapeutic advances, the mechanisms of resistance remain the underlying cause of morbidity and mortality. Lipoic acid (LA) is and an essential cofactor of oxidative metabolism via its function in pyruvate dehydrogenase and α-keto dehydrogenase complexes. Its potential therapeutic effects have been well documented in the treatment of pathologies associated with oxidative stress, such as diabetes, atherosclerosis, liver diseases and neurodegenerative diseases. In addition, it has been demonstrated its anticancer effects in various cancers, but its mechanisms of action are not fully understood. My PhD project aims to evaluate the inhibitory effect of LA on the proliferation of various breast cancer cell lines and to study the mechanisms of action likely to be involved in this process. Our results showed that LA inhibits cell proliferation by inhibiting PI3K/Akt and MAPK/ERK proliferative signaling. Our results contributed to a better understanding of the mechanisms of action leading to this anti-proliferative effect of LA. Indeed, we have demonstrated the reduction of the expression of the proprotein convertase, furin, responsible for the maturation of IGF-1R in response to LA resulting the inhibition of the maturation of this receptor. In addition, we have demonstrated that the pro-oxidative effect of LA reduces the the expression of the transcription factor, CREB, which is involved in the induction of furin expression. In conclusion, we demonstrated for the first the following mechanism of action: LA rapidly induces ROS by oxidative phosphorylation that inhibit the expression of the CREB transcription factor. This inhibition then blocks the transcriptional activation of furin, an enzyme that is crucial to allow the passage of the IGF-1R pro-form, which is immature and non-functional, to the mature form, IGF-1R, which is then recruited to the plasma membrane
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Diana Farhat. Intérêt de l’utilisation de stratégies anti-métaboliques pour le traitement du cancer du sein. Cancer. Université de Lyon; Université libanaise, 2019. Français. ⟨NNT : 2019LYSE1316⟩. ⟨tel-02454625⟩

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