Ap. Levy et al., HYPOXIA-INDUCIBLE PROTEIN BINDING TO VASCULAR ENDOTHELIAL GROWTH-FACTOR MESSENGER-RNA AND ITS MODULATION BY THE VON-HIPPEL-LINDAU PROTEIN, The Journal of biological chemistry, 271(41), 1996, pp. 25492-25497
Hypoxia induces an increase in the stability of the mRNA encoding vasc
ular endothelial growth factor (VEGF). We have previously demonstrated
that a 500-base region of the 3'-untranslated region of VEGF mRNA tha
t is critical for stabilization of VEGF mRNA in an in vitro degradatio
n assay forms a RNA-protein complex in a hypoxia-inducible fashion. We
report here the identification of three adenylate-uridylate-rich RNA
elements within this region that form an identical or closely related
hypoxia-inducible RNA-protein complex. This complex is constitutively
elevated in a tumor cell line lacking the wild type von Hippel-Lindau
tumor suppressor gene and in which VEGF mRNA is constitutively stabili
zed, Furthermore, the glucose transporter-1 mRNA, which is also stabil
ized by hypoxia, forms a hypoxia-inducible RNA-protein complex with si
milar sequence and protein binding characteristics to that described f
or VEGF mRNA. Finally, RNA affinity purification and UV cross linking
were used to identify three proteins of 32, 28, and 17 kDa that are de
rived from this hypoxia-inducible RNA-protein complex.