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2016 ; 17
(8
): 790-8
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A novel hypoxia-induced miR-147a regulates cell proliferation through a positive
feedback loop of stabilizing HIF-1?
#MMPMID27260617
Wang F
; Zhang H
; Xu N
; Huang N
; Tian C
; Ye A
; Hu G
; He J
; Zhang Y
Cancer Biol Ther
2016[Aug]; 17
(8
): 790-8
PMID27260617
show ga
Hypoxia is a general event in solid tumor growth. Therefore, induced cellular
responses by hypoxia are important for tumorigenesis and tumor growth. MicroRNAs
(miRNAs) have recently emerged as important regulators of hypoxia induced
cellular responses. Here we report that miR-147a is a novel and crucial hypoxia
induced miRNA. HIF-1? up-regulates the expression of miR-147a, and miR-147a in
turn stabilizes and accumulates HIF-1? protein via directly targeting HIF-3?, a
dominant negative regulator of HIF-1?. Subsequent studies in xenograft mouse
model reveal that miR-147a is capable of inhibiting tumor growth. Collectively,
these data demonstrate a positive feedback loop between HIF-1?, miR-147a and
HIF-3?, which provide a new insight into the mechanism of miR-147a induced cell
proliferation arrest under hypoxia.