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2016 ; 7
(43
): 70143-70151
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Interferon-stimulated gene 15 induces cancer cell death by suppressing the NF-?B
signaling pathway
#MMPMID27659523
Mao H
; Wang M
; Cao B
; Zhou H
; Zhang Z
; Mao X
Oncotarget
2016[Oct]; 7
(43
): 70143-70151
PMID27659523
show ga
Interferon-stimulated gene 15 (ISG15) is an important cytokine that has been
reported in carcinogenesis. However, we found that ISG15 and de-ISGylase USP18
were induced by several anti-cancer agents, which was confirmed by both RT-PCR
and immunoblotting assays. Further studies demonstrated that ectopic ISG15 and
USP18 inhibited proliferation of myeloma, leukemia and cervical cancer cells.
More importantly, ISG15 and USP18 induced cancer cell apoptosis. This finding was
confirmed in a cervical xenograft model in which cervical cancer growth was
suppressed by lentiviral ISG15. In the mechanistic study, ISG15 was found to
disrupt the NF-?B signaling pathway by downregulating the expression of IKK? and
p65, phosphorylation of p65 and I?B?. Consistent with this finding, ISG15
suppressed the expression of NF-?B recognition element-driving luciferase and
decreased the transcription of XIAP and Mcl-1, two typical genes regulated by
NF-?B. Therefore, the present study demonstrated that ISG15 induces cancer cell
apoptosis by disrupting the NF-?B signaling pathway. This study highlighted a
novel role of ISG15 in tumor suppression.