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2017 ; 7
(1
): 2597
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Diacylglycerol Kinase alpha is Involved in the Vitamin E-Induced Amelioration of
Diabetic Nephropathy in Mice
#MMPMID28572624
Hayashi D
; Yagi K
; Song C
; Ueda S
; Yamanoue M
; Topham M
; Suzaki T
; Saito N
; Emoto N
; Shirai Y
Sci Rep
2017[Jun]; 7
(1
): 2597
PMID28572624
show ga
Diabetic nephropathy (DN) is one of vascular complications of diabetes and is
caused by abnormal protein kinase C activation as a result of increased
diacylglycerol (DG) production in diabetic hyperglycaemia. Diacylglycerol kinase
(DGK) converts DG into phosphatidic acid. Therefore, it is expected that the
activation of DGK would ameliorate DN. Indeed, it has been reported that vitamin
E (VtE) ameliorates DN in rat by activating DGK, and we recently reported that
VtE specifically activates DGK? isoform in vitro. However, whether DGK? is
involved in the VtE-induced amelioration of DN in vivo remains unknown.
Therefore, we investigated the VtE-induced amelioration of DN in wild-type
(DGK?(+/+)) and DGK?-deficient (DGK?(-/-)) mice in which diabetes was induced by
streptozocin. Several symptoms of DN were ameliorated by VtE treatment in the
DGK?(+/+) mice but not in the DGK?(-/-) mice. Moreover, transmission electron
microscopy of glomeruli and immunofluorescent staining of glomerular epithelial
cells (podocytes) indicated that VtE ameliorates podocyte pathology and prevents
podocyte loss in the DGK?(+/+) mice but not in the DGK?(-/-) mice. We showed that
VtE can ameliorate DN in mice and that DGK? is involved in the VtE-induced
amelioration of DN in vivo, suggesting that DGK? is an attractive therapeutic
target for DN.