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2018 ; 37
(1
): 121
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LncGPR107 drives the self-renewal of liver tumor initiating cells and liver
tumorigenesis through GPR107-dependent manner
#MMPMID29925408
Huang G
; Jiang H
; Lin Y
; Xia W
; Luo Y
; Wu Y
; Cai W
; Zhou X
; Jiang X
J Exp Clin Cancer Res
2018[Jun]; 37
(1
): 121
PMID29925408
show ga
BACKGROUND: With self-renewal and differentiation properties, liver tumor
initiating cells (TICs) are the reasons for tumor initiation, metastasis and drug
resistance. G protein coupled receptors (GPCR) are critical modulators in many
physiological and pathological processes. While, their roles in liver TICs are
unknown. METHODS: An unbiased screening was performed using online-available data
dataset. Liver TICs were sorted by FACS with surface marker CD133, or enriched by
oncosphere formation. TIC self-renewal was examined by oncosphere formation and
tumor initiation assay. Loss of function and gain of function assays were
performed to examine the role of lncRNA. RNA pulldown, RNA immunoprecipitation,
ChIP, western blot and double FISH were used explore the molecular mechanism of
lncRNA. RESULTS: We performed an unbiased screening for GPCR expression in liver
cancers, and found GPR107 was the most highly expressed GPCR in liver cancer and
liver TICs. GPR107 was essential for the self-renewal of liver TICs. The
expression of GPR107 was regulated by a long noncoding RNA lncGPR107. LncGPR107
was also highly expressed in liver cancers and liver TICs. LncGPR107 drove the
self-renewal of liver TICs through GPR107. Moreover, lncGPR107 recruited SRCAP
complex to GPR107 promoter to drive its transcriptional activation. LncGPR107
depletion inhibited the binding of SRCAP complex and GPR107 promoter and
subsequent GPR107 expression. Moreover, LncGPR107-SRCAP-GPR107 can be targeted
for liver TIC elimination. CONCLUSION: GPR107 was the most highly expressed GPCR
in liver cancer and liver TICs. LncGPR107 participated in the transcriptional
regulation of GPR107 in cis, through recruiting SRCAP remodeling complex to
GPR107 promoter. This work revealed the important role of GPCR signaling in liver
TIC self-renewal and added a new layer for liver TIC and GPCR regulation.