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2016 ; 7
(52
): 85905-85916
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A regulatory loop involving miR-29c and Sp1 elevates the TGF-?1 mediated
epithelial-to-mesenchymal transition in lung cancer
#MMPMID27829234
Zhang HW
; Wang EW
; Li LX
; Yi SH
; Li LC
; Xu FL
; Wang DL
; Wu YZ
; Nian WQ
Oncotarget
2016[Dec]; 7
(52
): 85905-85916
PMID27829234
show ga
Specificity protein1 (Sp1) is required for TGF-?-induced
epithelial-to-mesenchymal transition (EMT) which has been demonstrated to
aggravate the progression of cancer including lung cancer. microRNA-29c (miR-29c)
is identified to inhibit EMT, but the correlation between miR-29c and Sp1 in
human lung cancer remain incompletely clarified. Here, we confirmed decreased
expression of miR-29c and enhanced expression of Sp1 in lung cancer tissues (n =
20) and found that Sp1 could be targeted and inhibited by miR-29c. Besides, the
expression of miR-29c was down-regulated in high-metastatic lung cancer cell
lines and TGF-?1-treated cells. The inhibition of miR-29c or overexpression of
Sp1 in 95C and A549 cells dramatically enhanced the cell migration and invasion,
and also induced the decrease in the expression of epithelial markers, e.g.
thyroid transcription factor 1 (TTF-1) and E-cadherin, together with an increase
in mesenchymal markers including vimentin, ?-smooth muscle actin (?-SMA), which
could be restored by overexpression of miR-29c mimics during the TGF-?-induced
EMT. Moreover, dual-luciferase reporter assay was performed and the results
indicated that miR-29c/Sp1 could form an auto-regulatory loop with TGF-?1, which
impaired TGFB1 transcription. Furthermore, miR-29c overexpression could abrogate
the tumor progression and inhibit the Sp1/TGF-? expressions in vivo, indicating
that miR-29c could be a tumor suppressor and repress the Sp1/TGF-? axis-induced
EMT in lung cancer.