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2016 ; 13
(9
): 837-47
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gab.com Text
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English Wikipedia
RPTOR, a novel target of miR-155, elicits a fibrotic phenotype of cystic fibrosis
lung epithelium by upregulating CTGF
#MMPMID27284727
Tsuchiya M
; Kalurupalle S
; Kumar P
; Ghoshal S
; Zhang Y
; Lehrmann E
; Becker KG
; Gorospe M
; Biswas R
RNA Biol
2016[Sep]; 13
(9
): 837-47
PMID27284727
show ga
Cystic fibrosis (CF) is an autosomal recessive disorder caused by mutations in
the cystic fibrosis transmembrane conductance regulator (CFTR) gene, the most
frequent of which is F508del-CFTR. CF is characterized by excessive secretion of
pro-inflammatory mediators into the airway lumen, inducing a highly inflammatory
cellular phenotype. This process triggers fibrosis, causing airway destruction
and leading to high morbidity and mortality. We previously reported that miR-155
is upregulated in CF lung epithelial cells, but the molecular mechanisms by which
miR-155 affects the disease phenotype is not understood. Here we report that
RPTOR (regulatory associated protein of mTOR, complex 1) is a novel target of
miR-155 in CF lung epithelial cells. The suppression of RPTOR expression and
subsequent activation of TGF-? signaling resulted in the induction of fibrosis by
elevating connective tissue growth factor (CTGF) abundance in CF lung epithelial
cells. Thus, we propose that miR-155 might regulate fibrosis of CF lungs through
the increased CTGF expression, highlighting its potential value in CF therapy.
|*Gene Expression Regulation
[MESH]
|3' Untranslated Regions
[MESH]
|Adaptor Proteins, Signal Transducing/*genetics
[MESH]