Physical and functional interaction of Runt-related protein 1 with hypoxia-inducible factor-1alpha.
Angiogenesis and hematopoiesis are closely linked and interactive with each other, but few studies were given to identify possible links between angiogenesis-promoting proteins and hematopoiesis-related transcription factors. Here we investigated the potential relationship of oxygen-sensitive alpha-subunit of angiogenesis-related hypoxia-inducible factor-1alpha (HIF-1alpha) with Runt-related protein 1 (Runx1, also known as acute myeloid leukemia-1, AML-1), an important hematopoietic transcription factor. The results demonstrated that Runx1 and HIF-1alpha proteins directly interacted with each other to a degree, in which Runt homology domain of Runx1 was mainly involved. Leukemia-related abnormal Runx1 fusion protein AML1-ETO, which fuses the N-terminal 177 amino acid residues of the Runx1 protein in frame to ETO (eight-twenty-one) protein, also interacted with HIF-1alpha protein with greater ability than Runx1 itself. More intriguingly, Runx1 overexpression inhibited DNA-binding and transcriptional activity of HIF-1 protein with reduced expression of HIF-1-targeted genes such as vascular endothelial growth factor, while silence of Runx1 expression by specific small interfering RNA significantly increased transcriptional activity of HIF-1 protein, suggesting that Runx1 inhibited transcription-dependent function of HIF-1. Vice versa, HIF-1alpha increased DNA-binding ability and transcriptional activity of Runx1 protein. All these data would shed new insight to understanding Runx1 and HIF-1alpha-related hematopoietic cell differentiation and angiogenesis.
Peng
Z G
ZG
Institute of Health Science, Shanghai Institutes for Biological Sciences of Chinese Academy of Sciences-Shanghai Jiao-Tong University School of Medicine (SJTU-SM, formerly Shanghai Second Medical University), Shanghai, China.
Zhou
M Y
MY
Huang
Y
Y
Qiu
J H
JH
Wang
L S
LS
Liao
S H
SH
Dong
S
S
Chen
G Q
GQ
D045744:Cell Line, Tumor; D050676:Core Binding Factor Alpha 2 Subunit / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D006410:Hematopoiesis / Q000235:genetics; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D018919:Neovascularization, Physiologic / Q000235:genetics; D017434:Protein Structure, Tertiary; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000494:pharmacology; D014158:Transcription, Genetic
D050676:Core Binding Factor Alpha 2 Subunit; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D034741:RNA, Small Interfering; D004247:DNA