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2015 ; 11
(12
): 2213-32
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
MIR517C inhibits autophagy and the epithelial-to-mesenchymal (-like) transition
phenotype in human glioblastoma through KPNA2-dependent disruption of TP53
nuclear translocation
#MMPMID26553592
Lu Y
; Xiao L
; Liu Y
; Wang H
; Li H
; Zhou Q
; Pan J
; Lei B
; Huang A
; Qi S
Autophagy
2015[]; 11
(12
): 2213-32
PMID26553592
show ga
The epithelial-to-mesenchymal (-like) transition (EMT), a crucial embryonic
development program, has been linked to the regulation of glioblastoma (GBM)
progression and invasion. Here, we investigated the role of MIR517C/miR-517c,
which belongs to the C19MC microRNA cluster identified in our preliminary
studies, in the pathogenesis of GBM. We found that MIR517C was associated with
improved prognosis in patients with GBM. Furthermore, following treatment with
the autophagy inducer temozolomide (TMZ) and low glucose (LG), MIR517C degraded
KPNA2 (karyopherin alpha 2 [RAG cohort 1, importin alpha 1]) and subsequently
disturbed the nuclear translocation of TP53 in the GBM cell line U87 in vitro.
Interestingly, this microRNA could inhibit autophagy and reduce cell migration
and infiltration in U87 cells harboring wild-type (WT) TP53, but not in U251
cells harboring mutant (MU) TP53. Moreover, the expression of epithelial markers
(i.e., CDH13/T-cadherin and CLDN1 [claudin 1]) increased, while the expression of
mesenchymal markers (i.e., CDH2/N-cadherin, SNAI1/Snail, and VIM [vimentin])
decreased, indicating that the EMT status was blocked by MIR517C in U87 cells.
Compared with MIR517C overexpression, MIR517C knockdown promoted infiltration of
U87 cells to the surrounding structures in nude mice in vivo. The above
phenotypic changes were also observed in TP53(+/+) and TP53(-/-) HCT116 colon
cancer cells. In summary, our study provided support for a link between autophagy
and EMT status in WT TP53 GBM cells and provided evidence for the signaling
pathway (MIR517C-KPNA2-cytoplasmic TP53) involved in attenuating autophagy and
eliminating the increased migration and invasion during the EMT.