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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+Alzheimers+Dis
2017 ; 55
(2
): 749-762
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Selenoprotein S Reduces Endoplasmic Reticulum Stress-Induced Phosphorylation of
Tau: Potential Role in Selenate Mitigation of Tau Pathology
#MMPMID27802219
Rueli RH
; Torres DJ
; Dewing AS
; Kiyohara AC
; Barayuga SM
; Bellinger MT
; Uyehara-Lock JH
; White LR
; Moreira PI
; Berry MJ
; Perry G
; Bellinger FP
J Alzheimers Dis
2017[]; 55
(2
): 749-762
PMID27802219
show ga
Previous studies demonstrated that selenium in the form of sodium selenate
reduces neurofibrillary tangle formation in Alzheimer's disease models.
Hyperphosphorylation of tau, which leads to formation of neurofibrillary tangles
in Alzheimer's disease, is increased by endoplasmic reticulum (ER) stress.
Selenoprotein S (SelS) is part of an ER membrane complex that removes misfolded
proteins from the ER as a means to reduce ER stress. Selenate, as with other
forms of selenium, will increase selenoprotein expression. We therefore proposed
that increased SelS expression by selenate would contribute to the beneficial
actions of selenate in Alzheimer's disease. SelS expression increased with ER
stress and decreased under conditions of elevated glucose concentrations in the
SH-SY5Y neuronal cell line. Reducing expression of SelS with siRNA promoted cell
death in response to ER stress. Selenate increased SelS expression, which
significantly correlated with decreased tau phosphorylation. Restricting SelS
expression during ER stress conditions increased tau phosphorylation, and also
promoted aggregation of phosphorylated tau in neurites and soma. In human
postmortem brain, SelS expression coincided with neurofibrillary tangles, but not
with amyloid-? plaques. These results indicate that selenate can alter
phosphorylation of tau by increasing expression of SelS in Alzheimer's disease
and potentially other neurodegenerative disorders.