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2018 ; 53
(1
): 59-72
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MORC2, a novel oncogene, is upregulated in liver cancer and contributes to
proliferation, metastasis and chemoresistance
#MMPMID29620211
Pan Z
; Ding Q
; Guo Q
; Guo Y
; Wu L
; Wu L
; Tang M
; Yu H
; Zhou F
Int J Oncol
2018[Jul]; 53
(1
): 59-72
PMID29620211
show ga
Microrchidia 2 (MORC2) is important in DNA damage repair and lipogenesis,
however, the clinical and functional role of MORC2 in liver cancer remains to be
fully elucidated. The aim the present study was to clarify the role of MORC2 in
liver cancer. Expression profile analysis, immunohistochemical staining, reverse
transcription-quantitative polymerase chain reaction analysis and western blot
analysis were performed to evaluate the levels of MORC2 in liver cancer patient
specimens and cell lines; subsequently the expression of MORC2 was suppressed or
increased in liver cancer cells and the effects of MORC2 on the cancerous
transformation of liver cancer cells were examined in vitro and in vivo. MORC2
was upregulated in liver cancer tissues, and the upregulation was associated with
certain clinicopathologic features of patients with liver cancer. MORC2 knockdown
caused marked inhibition of liver cancer cell proliferation and clonogenicity,
whereas the overexpression of MORC2 substantially promoted liver cancer cell
proliferation. In addition, the knockdown of MORC2 inhibited the migratory and
invasive ability of liver cancer cells, whereas increased migration and invasion
rates were observed in cells with ectopic expression of MORC2. In a model of nude
mice, the overexpression of MORC2 promoted tumorigenicity and markedly enhanced
pulmonary metastasis of liver cancer. Furthermore, MORC2 regulated apoptosis and
its expression level had an effect on the sensitivity of liver cancer cells to
doxorubicin, 5-fluorouracil and cisplatin. Mechanically, MORC2 modulated the
mitochondrial apoptotic pathway, possibly in a p53-dependent manner, and its
dysregulation also resulted in the abnormal activation of the Hippo pathway. For
the first time, to the best of our knowledge, the present study confirmed that
MORC2 was a novel oncogene in liver cancer. These results provide useful insight
into the mechanism underlying the tumorigenesis and progression of liver cancer,
and offers clues into potential novel liver cancer therapies.