Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 259.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 259.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 259.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\25589557
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Circulation
2015 ; 131
(7
): 643-55
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
NADPH oxidase 4 induces cardiac fibrosis and hypertrophy through activating
Akt/mTOR and NF?B signaling pathways
#MMPMID25589557
Zhao QD
; Viswanadhapalli S
; Williams P
; Shi Q
; Tan C
; Yi X
; Bhandari B
; Abboud HE
Circulation
2015[Feb]; 131
(7
): 643-55
PMID25589557
show ga
BACKGROUND: NADPH oxidase 4 (Nox4) has been implicated in cardiac remodeling, but
its precise role in cardiac injury remains controversial. Furthermore, little is
known about the downstream effector signaling pathways activated by Nox4-derived
reactive oxygen species in the myocardium. We investigated the role of Nox4 and
Nox4-associated signaling pathways in the development of cardiac remodeling.
METHODS AND RESULTS: Cardiac-specific human Nox4 transgenic mice (c-hNox4Tg) were
generated. Four groups of mice were studied: (1) control mice, littermates that
are negative for hNox4 transgene but Cre positive; (2) c-hNox4 Tg mice; (3)
angiotensin II (AngII)-infused control mice; and (4) c-hNox4Tg mice infused with
AngII. The c-hNox4Tg mice exhibited an ?10-fold increase in Nox4 protein
expression and an 8-fold increase in the production of reactive oxygen species,
and manifested cardiac interstitial fibrosis. AngII infusion to control mice
increased cardiac Nox4 expression and induced fibrosis and hypertrophy. The Tg
mice receiving AngII exhibited more advanced cardiac remodeling and robust
elevation in Nox4 expression, indicating that AngII worsens cardiac injury, at
least in part by enhancing Nox4 expression. Moreover, hNox4 transgene and AngII
infusion induced the expression of cardiac fetal genes and activated the Akt-mTOR
and NF?B signaling pathways. Treatment of AngII-infused c-hNox4Tg mice with
GKT137831, a Nox4/Nox1 inhibitor, abolished the increase in oxidative stress,
suppressed the Akt-mTOR and NF?B signaling pathways, and attenuated cardiac
remodeling. CONCLUSIONS: Upregulation of Nox4 in the myocardium causes cardiac
remodeling through activating Akt-mTOR and NF?B signaling pathways. Inhibition of
Nox4 has therapeutic potential to treat cardiac remodeling.