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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 Sci+Rep
2017 ; 7
(1
): 5311
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Suppressed autophagic response underlies augmentation of renal
ischemia/reperfusion injury by type 2 diabetes
#MMPMID28706237
Muratsubaki S
; Kuno A
; Tanno M
; Miki T
; Yano T
; Sugawara H
; Shibata S
; Abe K
; Ishikawa S
; Ohno K
; Kimura Y
; Tatekoshi Y
; Nakata K
; Ohwada W
; Mizuno M
; Miura T
Sci Rep
2017[Jul]; 7
(1
): 5311
PMID28706237
show ga
Diabetes mellitus is a major risk factor for acute kidney injury (AKI). Here, we
hypothesized that suppression of autophagic response underlies aggravation of
renal ischemia/reperfusion (I/R) injury by type 2 diabetes mellitus (T2DM). In
OLETF, a rat model of T2DM, and its non-diabetic control, LETO, AKI was induced
by unilateral nephrectomy and 30-min occlusion and 24-h reperfusion of the renal
artery in the contralateral kidney. Levels of serum creatinine and blood urea
nitrogen and tubular injury score after I/R were significantly higher in OLETF
than in LETO. Administration of chloroquine, a widely used autophagy inhibitor,
aggravated I/R-induced renal injury in LETO, but not in OLETF. In contrast to
LETO, OLETF exhibited no increase in autophagosomes in the proximal tubules after
I/R. Immunoblotting showed that I/R activated the AMPK/ULK1 pathway in LETO but
not in OLETF, and mTORC1 activation after I/R was enhanced in OLETF. Treatment of
OLETF with rapamycin, an mTORC1 inhibitor, partially restored autophagic
activation in response to I/R and significantly attenuated I/R-induced renal
injury. Collectively, these findings indicate that suppressed autophagic
activation in proximal tubules by impaired AMPK/ULK1 signaling and upregulated
mTORC1 activation underlies T2DM-induced worsening of renal I/R injury.
|*Autophagy
[MESH]
|Animals
[MESH]
|Blood Urea Nitrogen
[MESH]
|Creatinine/blood
[MESH]
|Diabetes Mellitus, Type 2/*complications/*pathology
[MESH]