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2015 ; 8
(10
): 12718-27
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Long non-coding RNA MALAT-1 is downregulated in preeclampsia and regulates
proliferation, apoptosis, migration and invasion of JEG-3 trophoblast cells
#MMPMID26722461
Chen H
; Meng T
; Liu X
; Sun M
; Tong C
; Liu J
; Wang H
; Du J
Int J Clin Exp Pathol
2015[]; 8
(10
): 12718-27
PMID26722461
show ga
Long non-coding RNA (lncRNA), as a newly identified subset of the transcriptome,
has been implicated in a variety of physiological and pathological processes.
Metastasis associated lung adenocarcinoma transcript-1 (MALAT-1), a lncRNA that
was initially detected in the metastatic lung cancer, was reported to be
overexpressed in placenta previa increta/percreta (I/P), which is caused by
excessive trophoblast invasion. However, the role of MALAT-1 in the regulation of
trophoblast behavior is not fully understood. In this study, we first examined
the expression of MALAT-1 in the placentas from the patients with preeclampsia,
the pathology of which is associated with inadequate trophoblast invasion, and
found that the expression of MALAT-1 was downregulated in the preeclamptic
placentas as compared to the normal placentas. We further investigated the
function of MALAT-1 in JEG-3 trophoblast cell line using short interfering RNA
(siRNA) against MALAT-1 transcripts. Silencing of MALAT-1 in JEG-3 cells
suppressed proliferation and induced cell cycle arrest at G0/G1 phase. Reduced
expression of MALAT-1 by RNA interference resulted in enhanced apoptosis in JEG-3
cells, accompanied with elevated levels of the pro-apoptotic proteins including
cleaved caspase-3, cleaved caspase-9 and cleaved poly (ADP-ribose) polymerase-1
(PARP-1). Moreover, the migration rate and the invasiveness of JEG-3 cells were
suppressed when MALAT-1 was downregulated. In summary, our results suggest that
MALAT-1 may play an important role in the regulation of proliferation, cell
cycle, apoptosis, migration and invasion of trophoblast cells, and
under-expression of MALAT-1 during early placentation may be involved in the
pathogenesis of preeclampsia.