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• W2620822975 abstract "The ETS transcription factors play a critical role during hematopoiesis. In F-MuLV-induced erythroleukemia, Fli‑1 insertional activation producing high expression of this transcription factor required to promote proliferation. How deregulated Fli‑1 expression alters the balance between erythroid differentiation and proliferation is unknown. To address this issue, we exogenously overexpressed Fli‑1 in an erythroleukemic cell harboring activation of spi‑1/PU.1, another ETS gene involved in erythroleukemogenesis. While the proliferation in culture remains unaffected, Fli‑1 overexpression imparts morphological and immunohistochemical characteristics of immature erythroid progenitors. Fli‑1 overexpression in erythroleukemic cells increased the numbers of erythroid colonies on methylcellulose and reduced tumorigenicity as evidenced by increase latency of erythroleukemogenesis in mice inoculated with these cells. Although all transplanted mice developed enlargement of the spleen and liver due to leukemic infiltration, Fli‑1 overexpression altered the hematopoietic phenotype, significantly increasing the expression of regulatory hematopoietic genes cKIT, SCA-1, CD41 and CD71. In contrast, expression of Spi‑1/PU.1 in a Fli‑1 producing erythroleukemia cell line in which fli‑1 is activated, resulted in increased proliferation through activation of growth promoting proteins MAPK, AKT, cMYC and JAK2. Importantly, these progenitors express high levels of markers such as CD71 and TER119 associated with more mature erythroid cells. Thus, Fli‑1 overexpression induces a de-differentiation program by reverting CFU-E to BFU-E erythroid progenitor activity, while Spi‑1/PU.1 promoting maturation from BFU-E to CFU-E." @default.
• W2620822975 created "2017-06-09" @default.
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• W2620822975 date "2017-06-02" @default.
• W2620822975 modified "2023-10-16" @default.
• W2620822975 title "Fli-1 overexpression in erythroleukemic cells promotes erythroid de-differentiation while Spi-1/PU.1 exerts the opposite effect" @default.
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• W2620822975 doi "https://doi.org/10.3892/ijo.2017.4027" @default.
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