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2016 ; 7
(2
): 1439-50
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English Wikipedia
ERK8 is a novel HuR kinase that regulates tumour suppressor PDCD4 through a
miR-21 dependent mechanism
#MMPMID26595526
Liwak-Muir U
; Dobson CC
; Naing T
; Wylie Q
; Chehade L
; Baird SD
; Chakraborty PK
; Holcik M
Oncotarget
2016[Jan]; 7
(2
): 1439-50
PMID26595526
show ga
Programmed cell death 4 (PDCD4) is a tumour suppressor implicated in cancer
development and progression and was recently identified as a repressor of
cap-independent translation of specific genes involved in the regulation of
apoptosis. We show that the RNA-binding protein HuR binds to the PDCD4 3'UTR to
protect it from miR-21-induced silencing. However, following H2O2 treatment,
PDCD4 mRNA is degraded via miR-21 binding. Importantly, we identify HuR as a
novel substrate of the ERK8 kinase pathway in response to H2O2 treatment. We show
that phosphorylation of HuR by ERK8 prevents it from binding to PDCD4 mRNA and
allows miR-21-mediated degradation of PDCD4.