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2016 ; 15
(22
): 3048-3059
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Novel protective mechanism of reducing renal cell damage in diabetes: Activation
AMPK by AICAR increased NRF2/OGG1 proteins and reduced oxidative DNA damage
#MMPMID27611085
Habib SL
; Yadav A
; Kidane D
; Weiss RH
; Liang S
Cell Cycle
2016[Nov]; 15
(22
): 3048-3059
PMID27611085
show ga
Exposure of renal cells to high glucose (HG) during diabetes has been recently
proposed to be involved in renal injury. In the present study, we investigated a
potential mechanism by which AICAR treatment regulates the DNA repair enzyme,
8-oxoG-DNA glycosylase (OGG1) in renal proximal tubular mouse cells exposed to HG
and in kidney of db/db mice. Cells treated with HG for 2 days show inhibition in
OGG1 promoter activity as well as OGG1 and Nrf2 protein expression. In addition,
activation of AMPK by AICAR resulted in an increase raptor phosphorylation at
Ser(792) and leads to increase the promoter activity of OGG1 through upregulation
of Nrf2. Downregulation of AMPK by DN-AMPK and raptor and Nrf2 by siRNA resulted
in significant decease in promoter activity and protein expression of OGG1. On
the other hand, downregulation of Akt by DN-Akt and rictor by siRNA resulted in
significant increase in promoter activity and protein expression of Nrf2 and
OGG1. Moreover, gel shift analysis shows reduction of Nrf2 binding to OGG1
promoter in cells treated with HG while cells treated with AICAR reversed the
effect of HG. Furthermore, db/db mice treated with AICAR show significant
increased in AMPK and raptor phosphroylation as well as OGG1 and Nrf2 protein
expression that associated with significant decrease in oxidative DNA damage
(8-oxodG) compared to non-treated mice. In summary, our data provide a novel
protective mechanism by which AICAR prevents renal cell damage in diabetes and
the consequence complications of hyperglycemia with a specific focus on
nephropathy.
|*DNA Damage
[MESH]
|AMP-Activated Protein Kinases/*metabolism
[MESH]
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]