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• W110062829 abstract "Although cure rates have significantly improved for children with T-cell acute lymphoblastic leukemia (T-ALL), 20-30% undergo induction failure or relapse with most succumbing to disease. Leukemia-initiating cells (L-ICs) are hypothesized to be resistant to conventional chemotherapy and radiation and are thereby responsible for disease recurrence. Using an in vivo limiting dilution assay, we previously showed that the murine T-ALL L-IC is quite rare, with only 0.003-0.05% of cells capable of initiating disease, and demonstrated that the L-IC is a subset of the leukemic DN3 thymic progenitor population. Work described in this thesis validates the L-IC assay using two transplantation methods to rule out effects of homing and/or microenvironment on T-ALL L-IC survival and maintenance. Using this assay, we demonstrate that sustained Notch1 signaling is required for T-ALL initiation in vivo and show that treatment with a Notch1 inhibitor reduces or in some cases eliminates the L-IC population. We further analyze the effects of inhibiting c-Myc, a Notch1-regulated gene, on L-IC frequency and uncover an essential role for c-Myc in L-IC survival and expansion. Suppressing c-Myc by using specific shRNAs or a c-Myc inhibitor reduces the L-IC population and interferes with leukemia initiation. Together, these findings reveal a critical role of the Notch1-c-Myc pathway in T-ALL initiation and suggest that therapeutics targeted at this pathway could be used to treat and/or prevent disease relapse in patients." @default.
• W110062829 created "2016-06-24" @default.
• W110062829 creator A5014318408 @default.
• W110062829 date "2013-01-01" @default.
• W110062829 modified "2023-09-23" @default.
• W110062829 title "The Notch1-c-Myc Pathway Mediates Leukemia-Initiating Cell Activity in Mouse T-ALL Models: A Dissertation" @default.
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