Identification of annexin 1 as a PU.1 target gene in leukemia cells.
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).
Division of Molecular Hematology, Kitasato University Graduate School of Medical Sciences, 1-15-1 Kitasato, Sagamihara City, Kanagawa 228-8555, Japan.
Yuko
Y
Iseki
Akemi
A
Imoto
Toshio
T
Okazaki
Hideo
H
Harigae
Shinichiro
S
Takahashi
D017305:Annexin A1 / Q000235:genetics*; D001483:Base Sequence; D005434:Flow Cytometry; D006801:Humans; D020014:K562 Cells; D004915:Leukemia, Erythroblastic, Acute / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D034741:RNA, Small Interfering; D015534:Trans-Activators / Q000235:genetics*; D000099232:Proto-Oncogene Protein Spi-1
D017305:Annexin A1; D011518:Proto-Oncogene Proteins; D034741:RNA, Small Interfering; D015534:Trans-Activators; D000099232:Proto-Oncogene Protein Spi-1