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2017 ; 108
(7
): 1405-1413
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p62/SQSTM1 as an oncotarget mediates cisplatin resistance through activating
RIP1-NF-?B pathway in human ovarian cancer cells
#MMPMID28498503
Yan XY
; Zhang Y
; Zhang JJ
; Zhang LC
; Liu YN
; Wu Y
; Xue YN
; Lu SY
; Su J
; Sun LK
Cancer Sci
2017[Jul]; 108
(7
): 1405-1413
PMID28498503
show ga
Platinum-based therapeutic strategies have been widely used in ovarian cancer
treatment. However, drug resistance has greatly limited therapeutic efficacy.
Recently, tolerance to cisplatin has been attributed to other factors unrelated
to DNA. p62 (also known as SQSTM1) functions as a multifunctional hub
participating in tumorigenesis and may be a therapeutic target. Our previous
study showed that p62 was overexpressed in drug-resistant ovarian epithelial
carcinoma and its inhibition increased the sensitivity to cisplatin. In this
study, we demonstrate that the activity of the NF-?B signaling pathway and
K63-linked ubiquitination of RIP1 was higher in cisplatin-resistant ovarian
(SKOV3/DDP) cells compared with parental cells. In addition, cisplatin resistance
could be reversed by inhibiting the expression of p62 using siRNA. Furthermore,
deletion of the ZZ domain of p62 that interacts with RIP1 in SKOV3 cells markedly
decreased K63-linked ubiquitination of RIP1 and inhibited the activation of the
NF-?B signaling pathway. Moreover, loss of the ZZ domain from p62 led to poor
proliferative capacity and high levels of apoptosis in SKOV3 cells and made them
more sensitive to cisplatin treatment. Collectively, we provide evidence that p62
is implicated in the activation of NF-?B signaling that is partly dependent on
RIP1. p62 promotes cell proliferation and inhibits apoptosis thus mediating drug
resistance in ovarian cancer cells.
|Antineoplastic Agents/pharmacology
[MESH]
|Blotting, Western
[MESH]
|Carcinoma, Ovarian Epithelial
[MESH]
|Cell Line, Tumor
[MESH]
|Cisplatin/pharmacology
[MESH]
|Drug Resistance, Neoplasm/*physiology
[MESH]
|Female
[MESH]
|Flow Cytometry
[MESH]
|Fluorescent Antibody Technique
[MESH]
|Humans
[MESH]
|Immunoprecipitation
[MESH]
|Microscopy, Confocal
[MESH]
|NF-kappa B/*metabolism
[MESH]
|Neoplasms, Glandular and Epithelial/metabolism/*pathology
[MESH]