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2014 ; 2014
(ä): 802841
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Gremlin activates the Smad pathway linked to epithelial mesenchymal
transdifferentiation in cultured tubular epithelial cells
#MMPMID24949470
Rodrigues-Diez R
; Rodrigues-Diez RR
; Lavoz C
; Carvajal G
; Droguett A
; Garcia-Redondo AB
; Rodriguez I
; Ortiz A
; Egido J
; Mezzano S
; Ruiz-Ortega M
Biomed Res Int
2014[]; 2014
(ä): 802841
PMID24949470
show ga
Gremlin is a developmental gene upregulated in human chronic kidney disease and
in renal cells in response to transforming growth factor-? (TGF-?). Epithelial
mesenchymal transition (EMT) is one process involved in renal fibrosis. In
tubular epithelial cells we have recently described that Gremlin induces EMT and
acts as a downstream TGF-? mediator. Our aim was to investigate whether Gremlin
participates in EMT by the regulation of the Smad pathway. Stimulation of human
tubular epithelial cells (HK2) with Gremlin caused an early activation of the
Smad signaling pathway (Smad 2/3 phosphorylation, nuclear translocation, and
Smad-dependent gene transcription). The blockade of TGF-?, by a neutralizing
antibody against active TGF-?, did not modify Gremlin-induced early Smad
activation. These data show that Gremlin directly, by a TGF-? independent
process, activates the Smad pathway. In tubular epithelial cells long-term
incubation with Gremlin increased TGF-? production and caused a sustained Smad
activation and a phenotype conversion into myofibroblasts-like cells. Smad 7
overexpression, which blocks Smad 2/3 activation, diminished EMT changes observed
in Gremlin-transfected tubuloepithelial cells. TGF-? neutralization also
diminished Gremlin-induced EMT changes. In conclusion, we propose that Gremlin
could participate in renal fibrosis by inducing EMT in tubular epithelial cells
through activation of Smad pathway and induction of TGF-?.