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• W2075185711 abstract "Abstract The model of erythroleukemia caused by Spi-1/PU.1 transgenesis in mice is a multistage disease. A preleukemic step is characterized by an acute proliferation of proerythroblasts due to the arrest of differentiation provoked by Spi-1/PU.1. Later on, a blastic crisis occurs associated with somatic oncogenic mutations in the stem cell factor (SCF) receptor kit. To gain insights into the mechanisms of the leukemic progression, we performed proteomic profiling analyses of proerythroblasts isolated at the 2 stages of the disease. Our results indicate that the level of ezrin, a membrane cytoskeletal crosslinker, is increased in the leukemic cells. We show that Kit oncogenic forms are responsible for ezrin phosphorylation and that phosphorylation rather than overexpression is essential in the leukemic proerythroblasts. Using expression of dominant-negative forms of ezrin, we show that phosphorylation of ezrin on residue Y353 participates in apoptosis resistance, whereas phosphorylation on residue Y145 promotes proliferation of the leukemic cells in vitro and in vivo. Another recurrent oncogenic form of tyrosine kinases (Flt3) most frequently involved in human myeloid leukemia was also able to phosphorylate ezrin. These findings point to a new role for ezrin as signaling player in the development of leukemia, being a downstream effector of oncogenic tyrosine kinases in leukemic blasts." @default.
• W2075185711 created "2016-06-24" @default.
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• W2075185711 date "2008-03-15" @default.
• W2075185711 modified "2023-09-30" @default.
• W2075185711 title "Ezrin is a target for oncogenic Kit mutants in murine erythroleukemia" @default.
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• W2075185711 doi "https://doi.org/10.1182/blood-2007-09-110510" @default.
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• W2075185711 hasPublicationYear "2008" @default.
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