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2016 ; 30
(11
): 3733-3744
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Profibrotic up-regulation of glucose transporter 1 by TGF-? involves activation
of MEK and mammalian target of rapamycin complex 2 pathways
#MMPMID27480571
Andrianifahanana M
; Hernandez DM
; Yin X
; Kang JH
; Jung MY
; Wang Y
; Yi ES
; Roden AC
; Limper AH
; Leof EB
FASEB J
2016[Nov]; 30
(11
): 3733-3744
PMID27480571
show ga
TGF-? plays a central role in the pathogenesis of fibroproliferative disorders.
Defining the exact underlying molecular basis is therefore critical for the
development of viable therapeutic strategies. Here, we show that expression of
the facilitative glucose transporter 1 (GLUT1) is induced by TGF-? in fibroblast
lines and primary cells and is required for the profibrotic effects of TGF-?. In
addition, enhanced GLUT1 expression is observed in fibrotic areas of lungs of
both patients with idiopathic pulmonary fibrosis and mice that are subjected to a
fibrosis-inducing bleomycin treatment. By using pharmacologic and genetic
approaches, we demonstrate that up-regulation of GLUT1 occurs via the canonical
Smad2/3 pathway and requires autocrine activation of the receptor tyrosine
kinases, platelet-derived and epidermal growth factor receptors. Engagement of
the common downstream effector PI3K subsequently triggers activation of the MEK
and mammalian target of rapamycin complex 2, which cooperate in regulating GLUT1
expression. Of note, inhibition of GLUT1 activity and/or expression is shown to
impair TGF-?-driven fibrogenic processes, including cell proliferation and
production of profibrotic mediators. These findings provide new perspectives on
the interrelation of metabolism and profibrotic TGF-? signaling and present
opportunities for potential therapeutic intervention.-Andrianifahanana, M.,
Hernandez, D. M., Yin, X., Kang, J.-H., Jung, M.-Y., Wang, Y., Yi, E. S., Roden,
A. C., Limper, A. H., Leof, E. B. Profibrotic up-regulation of glucose
transporter 1 by TGF-? involves activation of MEK and mammalian target of
rapamycin complex 2 pathways.