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2018 ; 8
(1
): 10548
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Novel Interplay Between Smad1 and Smad3 Phosphorylation via AGE Regulates the
Progression of Diabetic Nephropathy
#MMPMID30002389
Ono H
; Abe H
; Sakurai A
; Ochi A
; Tominaga T
; Tamaki M
; Kishi S
; Murakami T
; Nagai K
; Kohashi M
; Doi T
Sci Rep
2018[Jul]; 8
(1
): 10548
PMID30002389
show ga
Diabetic nephropathy (DN) is the major cause of end-stage renal failure and is
associated with increased morbidity and mortality compared with other causes of
renal diseases. We previously found that Smad1 plays a critical role in the
development of DN both in vitro and in vivo. However, functional interaction
between Smad1 and Smad3 signaling in DN is unclear. Here, we addressed the
molecular interplay between Smad1 and Smad3 signaling under a diabetic condition
by using Smad3-knockout diabetic mice. Extracellular matrix (ECM) protein
overexpression and Smad1 activation were observed in the glomeruli of db/db mice
but were suppressed in the glomeruli of Smad3(+/-); db/db mice. Smad3 activation
enhanced the phosphorylation of Smad1 C-terminal domain but decreased the
phosphorylation of linker domain, thus regulating Smad1 activation in advanced
glycation end product-treated mesangial cells (MCs). However, forced
phosphorylation of the Smad1 linker domain did not affect Smad3 activation in
MCs. Phosphorylation of the Smad1 linker domain increased in Smad3(+/-); db/db
mice and probucol-treated db/db mice, which was consistent with the attenuation
of ECM overproduction. These results indicate that Smad3 expression and
activation or probucol treatment alters Smad1 phosphorylation, thus suggesting
new molecular mechanisms underlying DN development and progression.