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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 Lipids+Health+Dis
2017 ; 16
(1
): 126
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Advanced glycation end products (AGEs) increase renal lipid accumulation: a
pathogenic factor of diabetic nephropathy (DN)
#MMPMID28659153
Yuan Y
; Sun H
; Sun Z
Lipids Health Dis
2017[Jun]; 16
(1
): 126
PMID28659153
show ga
BACKGROUND: Advanced glycation end products (AGEs) are pathogenic factors of
diabetic nephropathy (DN), causing renal damage in various ways. The aim of this
study is to investigate the ectopic lipid accumulation caused by AGEs in human
renal tubular epithelial cell line (HK-2) cells and the kidney of type 2 diabetic
rats. METHODS: In vivo study, diabetes was induced in male Sprague-Dawley rats
through intraperitoneal injection of high-fat/high-sucrose diet and low-dose
streptozocin (STZ). Two weeks after STZ injection, the diabetic rats were
randomly divided into two groups, namely, untreated diabetic and Aminoguanidine
Hydrochloride (AG, an AGEs formation inhibitor)-treated (100 mg/Kg/day, i.g., for
8 weeks) group. In vitro study, according to the different treatments, HK-2 were
divided into 6 groups. Intracellular cholesterol content was assessed by Oil Red
O staining and cholesterol enzymatic assay. Expression of mRNA and protein of
molecules controlling cholesterol homeostasis in the treated cells was examined
by real-time quantitative PCR and western blotting, respectively. SREBP
cleavage-activating protein (SCAP) translocation was detected by confocal
microscopy. RESULTS: Here we found N?-(carboxymethyl) lysine (CML, a member of
the AGEs family) increased Oil Red O staining and intracellular cholesterol ester
(CE) in HK-2 cells; Anti-RAGE (AGEs receptor) reduced lipid droplets and the CE
level. A strong staining of Oil Red O was also found in the renal tubules of the
diabetic rats, which could be alleviated by AG. CML upregulated both mRNA and
protein expression of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoAR),
LDL receptor (LDLr), sterol regulatory element binding protein-2 (SREBP-2) and
SCAP, which were inhibited by anti-RAGE. The upregulation of these molecules in
the kidney of the diabetic rats was also ameliorated by AG. Furthermore, AG
reduced serum and renal CML deposition, and improved urine protein and u-NGAL in
type 2 diabetic rats. CONCLUSIONS: Overall, these results suggest that CML caused
DN might be via disturbing the intracellular feedback regulation of cholesterol.
Inhibition of CML-induced lipid accumulation might be a potential renoprotective
role in the progression of DN.