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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Diabetes+Res
2018 ; 2018
(ä): 3405695
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Early Growth Response 1 (Egr1) Is a Transcriptional Activator of NOX4 in
Oxidative Stress of Diabetic Kidney Disease
#MMPMID29854821
Hu F
; Xue M
; Li Y
; Jia YJ
; Zheng ZJ
; Yang YL
; Guan MP
; Sun L
; Xue YM
J Diabetes Res
2018[]; 2018
(ä): 3405695
PMID29854821
show ga
BACKGROUND: NADPH oxidase 4 (NOX4) plays a major role in renal oxidative stress
of diabetic kidney disease (DKD). NOX4 was significantly increased in
Egr1-expressing fibroblasts, but the relationship between Egr1 and NOX4 in DKD is
unclear. METHODS: For the evaluation of the potential relationship between Egr1
and NOX4, both were detected in HFD/STZ-induced mice and HK-2 cells treated with
TGF-?1. Then, changes in NOX4 expression were detected in HK-2 cells and mice
with overexpression and knockdown of Egr1. The direct relationship between Egr1
and NOX4 was explored via chromatin immunoprecipitation (ChIP). RESULTS: We found
increased levels of Egr1, NOX4, and ?-SMA in the kidney cortices of diabetic mice
and in TGF-?1-treated HK-2 cells. Overexpression or silencing of Egr1 in HK-2
cells could upregulate or downregulate NOX4 and ?-SMA. ChIP assays revealed that
TGF-?1 induced Egr1 to bind to the NOX4 promoter. Finally, Egr1 overexpression or
knockdown in diabetic mice could upregulate or downregulate the expression of
NOX4 and ROS, and ?-SMA was also changed. CONCLUSION: Our study provides strong
evidence that Egr1 is a transcriptional activator of NOX4 in oxidative stress of
DKD. Egr1 contributes to DKD by enhancing EMT, in part by targeting NOX4.