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2018 ; 9
(7
): 761
Nephropedia Template TP
gab.com Text
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English Wikipedia
BET bromodomain inhibitor JQ1 preferentially suppresses EBV-positive
nasopharyngeal carcinoma cells partially through repressing c-Myc
#MMPMID29988031
Li N
; Yang L
; Qi XK
; Lin YX
; Xie X
; He GP
; Feng QS
; Liu LR
; Xie X
; Zeng YX
; Feng L
Cell Death Dis
2018[Jul]; 9
(7
): 761
PMID29988031
show ga
The management of advanced nasopharyngeal carcinoma (NPC) remains a challenge.
The ubiquitous nature of Epstein-Barr virus (EBV) infection in nonkeratinizing
NPC has forced us to investigate novel drugs for NPC in the presence of EBV. In
this study, we performed a small-scale screening of a library of compounds that
target epigenetic regulators in paired EBV-positive and EBV-negative NPC cell
lines. We found that bromodomain and extra-terminal (BET) inhibitor JQ1
preferentially inhibits the growth of EBV-positive NPC cells. JQ1 induces
apoptosis, decreases cell proliferation and enhances the radiosensitivity in NPC
cells, especially EBV-positive cells. Significantly, JQ1-induced cell death is
c-Myc-dependent. Notably, RNA-seq analysis demonstrated that JQ1 represses TP63,
TP53 and their targets. JQ1 also lessens the expression of PD-L1 in NPC.
Moreover, the high potency of JQ1 in NPC cells was further confirmed in vivo in
CNE2-EBV+ tumor-bearing mice. These findings indicate that JQ1 is a promising
therapeutic candidate for advanced NPC.