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  • Title: Identification of annexin 1 as a PU.1 target gene in leukemia cells.
    Author: Iseki Y, Imoto A, Okazaki T, Harigae H, Takahashi S.
    Journal: Leuk Res; 2009 Dec; 33(12):1658-63. PubMed ID: 19428102.
    Abstract:
    To identify PU.1 downstream target genes, we first established PU.1-knockdown K562 (K562PU.1KD) cells expressing reduced levels of PU.1 by stably transfected PU.1 siRNAs. From microarray analysis, we found that several genes including annexin 1 were markedly induced in K562PU.1KD cells. Annexin 1 is a calcium- and phospholipid-binding protein and increased expression leads to the constitutive activation of extracellular signal-regulated kinase (ERK). Consistent with this, we observed constitutive activation of ERK in K562PU.1KD cells. Furthermore, we revealed the mRNA expression of annexin 1 was negatively correlated with PU.1 mRNA expression in 43 primary AML specimens (R=-0.31, p<0.042).
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