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Fonctions et régulations de la kinase CHK1 dans l'hématopoïèse normale et leucémique

Abstract : The protein Checkpoint kinase 1 (CHK1) acts as a double agent. Indeed, CHK1 is a key player in the cell cycle, both in a normal cellular context and stress conditions such as DNA damage. The goal of my PhD project was to evaluate the functions and regulation of this protein in these two contexts, working on normal and leukemic hematopoiesis. Several studies have already described a role of CHK1 in normal hematopoiesis, but the mechanisms behind the importance of CHK1 in differentiation, particularly in megakaryopoiesis, remain to be elucidated. In addition, CHK1 has proven to be important in Acute Myeloid Leukemia (AML), particularly in the context of resistance to chemotherapy. To better understand the biology of AML, and identify ways to target CHK1, it is necessary to decipher how this kinase is regulated in this context. These two axes have been the backbone of my thesis work, which aims to better define the CHK1 kinase role in these two cellular contexts. It highlights a role for CHK1 in normal megakaryopoiesis, possibly by regulating the activity of the NF-E2 transcription factor. In addition, in the context of Acute Myeloid Leukemia, this work identifies the USP7 deubiquitynase as a major regulator of CHK1 protein levels in AML, and as a new interesting therapeutic target in this pathology.
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Maëlle Cartel. Fonctions et régulations de la kinase CHK1 dans l'hématopoïèse normale et leucémique. Cancer. Université Paul Sabatier - Toulouse III, 2019. Français. ⟨NNT : 2019TOU30150⟩. ⟨tel-02628569⟩

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