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2011 ; 437
(3
): 515-20
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Transforming growth factor-?2 promotes Snail-mediated endothelial-mesenchymal
transition through convergence of Smad-dependent and Smad-independent signalling
#MMPMID21585337
Medici D
; Potenta S
; Kalluri R
Biochem J
2011[Aug]; 437
(3
): 515-20
PMID21585337
show ga
EndMT (endothelial-mesenchymal transition) is a critical process of cardiac
development and disease progression. However, little is know about the signalling
mechanisms that cause endothelial cells to transform into mesenchymal cells. In
the present paper we show that TGF-?2 (transforming growth factor-?2) stimulates
EndMT through the Smad, MEK [MAPK (mitogen-activated protein kinase)/ERK
(extracellular-signal-regulated kinase) kinase], PI3K (phosphinositide 3-kinase)
and p38 MAPK signalling pathways. Inhibitors of these pathways prevent
TGF-?2-induced EndMT. Furthermore, we show that all of these pathways are
essential for increasing expression of the cell-adhesion-suppressing
transcription factor Snail. Inhibition of Snail with siRNA (small interfering
RNA) prevents TGF-?2-induced EndMT. However, overexpression of Snail is not
sufficient to cause EndMT. Chemical inhibition of GSK-3? (glycogen synthase
kinase-3?) allows EndMT to be induced by Snail overexpression. Expression of a
mutant Snail protein that is resistant to GSK-3?-dependent inactivation also
promotes EndMT. These results provide the foundation for understanding the roles
of specific signalling pathways in mediating EndMT.