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2017 ; 8
(10
): e3084
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Regulation of RIP3 by the transcription factor Sp1 and the epigenetic regulator
UHRF1 modulates cancer cell necroptosis
#MMPMID28981102
Yang C
; Li J
; Yu L
; Zhang Z
; Xu F
; Jiang L
; Zhou X
; He S
Cell Death Dis
2017[Oct]; 8
(10
): e3084
PMID28981102
show ga
Receptor-interacting kinase-3 (RIP3) is a key regulator of necroptosis. It has
been shown that the expression of RIP3 is silenced in most cancer cells and
tissues due to genomic methylation. However, the regulatory mechanisms
controlling RIP3 expression in cancer cells have not been fully elucidated. Here,
we report that Sp1, a well-characterized zinc-finger transcription factor,
directly regulates RIP3 expression in cancer cells. Knockdown of endogenous Sp1
significantly decreases the transcription of Rip3, thereby further inhibiting
necroptosis. The re-expression of Sp1 restores the necroptotic response. In
addition, knockdown of epigenetic regulator UHRF1 (ubiquitin-like, containing PHD
and RING finger domains 1) in RIP3-null cancer cells reduces the methylation
level of the Rip3 promoter. This effect is sufficient to trigger the expression
of RIP3 in RIP3-null cancer cells. The induced expression of RIP3 by UHRF1 RNAi
depends on the presence of Sp1. Remarkably, the ectopic expression of RIP3 in
RIP3-null cancer cells results in a decrease in tumor growth in mice. Therefore,
our findings offer insights into RIP3 expression control in cancer cells and
suggest an inhibitory effect of RIP3 on tumorigenesis.
|Animals
[MESH]
|CCAAT-Enhancer-Binding Proteins/*genetics
[MESH]
|Carcinogenesis/genetics
[MESH]
|Cell Line, Tumor
[MESH]
|DNA Methylation/genetics
[MESH]
|Epigenesis, Genetic/genetics
[MESH]
|Gene Expression Regulation, Neoplastic
[MESH]
|Gene Knockdown Techniques
[MESH]
|Genome, Human
[MESH]
|Humans
[MESH]
|Mice
[MESH]
|Necrosis/*genetics/pathology
[MESH]
|Neoplasms/*genetics/pathology
[MESH]
|Receptor-Interacting Protein Serine-Threonine Kinases/*genetics
[MESH]