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2014 ; 289
(41
): 28310-23
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The translation initiation factor eIF3i up-regulates vascular endothelial growth
factor A, accelerates cell proliferation, and promotes angiogenesis in embryonic
development and tumorigenesis
#MMPMID25147179
Yuan Y
; Zhang Y
; Yao S
; Shi H
; Huang X
; Li Y
; Wei Y
; Lin S
J Biol Chem
2014[Oct]; 289
(41
): 28310-23
PMID25147179
show ga
Vascular endothelial growth factor A (VEGFA) is a critical proangiogenic factor
that is activated by hypoxia at both the transcriptional and post-transcriptional
levels. In hypoxia conditions, stabilized hypoxia-inducible factor 1? (HIF1A) is
the key regulator for transcriptional activation of VEGFA. However, the
post-transcriptional control of VEGFA expression remains poorly understood. Here,
we report that the eukaryotic translation initiation factor 3i (eIF3i) is
required for VEGFA protein expression in both normal embryonic and tumorigenic
angiogenesis. eIF3i is dynamically expressed in the early stages of zebrafish
embryogenesis and in human hepatocellular carcinoma tissues. eIF3i homozygous
mutant zebrafish embryos show severe angiogenesis defects and human
hepatocellular cancer cells with depletion of eIF3i to induce less angiogenesis
in tumor models. Under hypoxia, the HIF1A protein can interact with its binding
sequence in the eIF3i promoter and activate eIF3i transcription. The expression
of VEGFA, which should rise in hypoxia, is significantly inhibited by eIF3i siRNA
treatment. Moreover, eIF3i knockdown did not cause a general translation
repression but specifically reduced the translation efficiency of the VEGFA
mRNAs. Taken together, our results suggest that eIF3i is induced by HIF1A under
hypoxia and controls normal and tumorigenic angiogenesis through regulating VEGFA
protein translation.