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Genre/Form: | Thèses et écrits académiques |
---|---|
Material Type: | Document, Thesis/dissertation |
Document Type: | Computer File |
All Authors / Contributors: |
Anne Buffiere; Ronan Quéré; Université Bourgogne Franche-Comté.; École doctorale Environnements, Santé (Dijon / Besançon) (2012-....).; Lipides, Nutrition, Cancer (LNC) (Dijon). |
OCLC Number: | 1102634052 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Anne Buffiere ; sous la direction de Ronan Quéré. |
Abstract:
My PhD work concerns T-cells acute lymphoblastic leukemia (T-ALL) and includes two projects. The first one, Saracatinib impairs maintenance of human T-ALL by targeting the LCK tyrosine kinase in cells displaying high level of lipid rafts, allow us to identify a new signaling pathway important for the proliferation of T-ALL cells. We showed that LCK is localized into lipid rafts and is involved in the growth of T-ALL cells. The LCK inhibitor Saracatinib affects T-ALL cells in vitro and in vivo by targeting the most aggressive cells displaying high level of lipid rafts. These results highlight a new therapeutic strategy to treat T-ALL and were published in Leukemia in January 2018. The second project, T cell acute lymphoblastic leukemia produces autocrine interleukin 7, demonstrated for the first time that T-ALL cells are able to produce IL-7 cytokine. We performed an analysis of epigenetic mechanisms involved in the regulation of this autocrine secretion. Our results showed that when the IL-7 gene promoter is low methylated, Interferon Regulatory Factor 1 (IRF-1) and (IRF-2) transcription factors bind IRF-E sequence and upregulate IL-7 gene transcription. Thanks to IL 7 gene inactivation in one of our T ALL models, we demonstrated that autocrine secretion promotes leukemia development on xenografted mice through increasing engraftment cells capacity and leukemia initiating cells number. Thus, epigenetic regulation of IL-7 autocrine secretion may be involved in the leukemogenesis of T-ALL.
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Related Subjects:(10)
- Leucémie aigüe lymphoblastique.
- Protéine tyrosine kinase p56(lck) spécifique des lymphocytes -- Dissertation universitaire.
- Microdomaines membranaires -- Dissertation universitaire.
- Communication autocrine -- Dissertation universitaire.
- Interleukine 7.
- Leucémies aiguës lymphoblastiques T
- Saracatinib
- Radeaux lipidiques
- Il-7
- Sécrétion autocrine