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- W2018519340 abstract "Constitutive tyrosine kinase activity of the breakpoint cluster region (Bcr)-Abl fusion protein is characteristic of chronic myelogenous leukemia (CML). As resistance against Imatinib a Bcr-abl inhibitor used in CML, was described, Heat shock protein (Hsp90) became an alternative target as inhibition of Bcr-Abl-Hsp90 complex leads to proliferation arrest. Here, we used natural product Radicicol (Rad), a macrocyclic antifungal, as an Hsp90 inhibitor to investigate the effect of Bcr-Abl inactivation on erythroid gene expression and subsequently on the transcription factors involved in their regulation. We showed that all erythroid genes studied were over-expressed after Rad treatment while Bcr-Abl expression was inhibited. Specific transcription factor NF-E2 was induced in Rad-treated cells as well as GATA-1 cofactors Friend of GATA (FOG)1 and SP1, whereas PU.1 was downregulated. Moreover, p38 mitogen activated protein kinase (MAPK) inhibition prevented Rad-mediated differentiation of K562 in correlation with decreased gamma-globin expression and suppression of Rad-mediated inhibition of PU.1. In conclusion, our results show that Radicicol leads to Bcr-Abl inactivation via Hsp90 inhibition inducing reactivation of the erythroid program in K562 cells." @default.
- W2018519340 created "2016-06-24" @default.
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- W2018519340 date "2008-01-01" @default.
- W2018519340 modified "2023-09-30" @default.
- W2018519340 title "Radicicol-mediated inhibition of Bcr-Abl in K562 cells induced p38-MAPK dependent erythroid differentiation and PU.1 down-regulation." @default.
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- W2018519340 doi "https://doi.org/10.3233/bio-2009-1085" @default.
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