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2017 ; 8
(31
): 51108-51122
Nephropedia Template TP
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Heterogeneous nuclear ribonucleoprotein (hnRNP) L promotes DNA damage-induced
cell apoptosis by enhancing the translation of p53
#MMPMID28881634
Seo JY
; Kim DY
; Kim SH
; Kim HJ
; Ryu HG
; Lee J
; Lee KH
; Kim KT
Oncotarget
2017[Aug]; 8
(31
): 51108-51122
PMID28881634
show ga
The tumor suppressor p53 is an essential gene in the induction of cell cycle
arrest, DNA repair, and apoptosis. p53 protein is induced under cellular stress,
blocking cell cycle progression and inducing DNA repair. Under DNA damage
conditions, it has been reported that post-transcriptional regulation of p53 mRNA
contributes to the increase in p53 protein level. Here we demonstrate that
heterogeneous nuclear ribonucleoprotein (hnRNP) L enhances p53 mRNA translation.
We found that hnRNP L is increased and binds to the 5'UTR of p53 mRNA in response
to DNA damage. Increased hnRNP L caused enhancement of p53 mRNA translation.
Conversely, p53 protein levels were decreased following hnRNP L knock-down,
rendering them resistant to apoptosis and arrest in the G2/M phase after DNA
damage. Thus, our findings suggest that hnRNP L functions as a positive regulator
of p53 translation and promotes cell cycle arrest and apoptosis.