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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 Am+J+Physiol+Endocrinol+Metab
2014 ; 306
(11
): E1225-38
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Glucotoxicity targets hepatic glucokinase in Zucker diabetic fatty rats, a model
of type 2 diabetes associated with obesity
#MMPMID24714398
Ueta K
; O'Brien TP
; McCoy GA
; Kim K
; Healey EC
; Farmer TD
; Donahue EP
; Condren AB
; Printz RL
; Shiota M
Am J Physiol Endocrinol Metab
2014[Jun]; 306
(11
): E1225-38
PMID24714398
show ga
A loss of glucose effectiveness to suppress hepatic glucose production as well as
increase hepatic glucose uptake and storage as glycogen is associated with a
defective increase in glucose phosphorylation catalyzed by glucokinase (GK) in
Zucker diabetic fatty (ZDF) rats. We extended these observations by investigating
the role of persistent hyperglycemia (glucotoxicity) in the development of
impaired hepatic GK activity in ZDF rats. We measured expression and localization
of GK and GK regulatory protein (GKRP), translocation of GK, and hepatic glucose
flux in response to a gastric mixed meal load (MMT) and hyperglycemic
hyperinsulinemic clamp after 1 or 6 wk of treatment with the sodium-glucose
transporter 2 inhibitor (canaglifrozin) that was used to correct the persistent
hyperglycemia of ZDF rats. Defective augmentation of glucose phosphorylation in
response to a rise in plasma glucose in ZDF rats was associated with the
coresidency of GKRP with GK in the cytoplasm in the midstage of diabetes, which
was followed by a decrease in GK protein levels due to impaired
posttranscriptional processing in the late stage of diabetes. Correcting
hyperglycemia from the middle diabetic stage normalized the rate of glucose
phosphorylation by maintaining GK protein levels, restoring normal nuclear
residency of GK and GKRP under basal conditions and normalizing translocation of
GK from the nucleus to the cytoplasm, with GKRP remaining in the nucleus in
response to a rise in plasma glucose. This improved the liver's metabolic ability
to respond to hyperglycemic hyperinsulinemia. Glucotoxicity is responsible for
loss of glucose effectiveness and is associated with altered GK regulation in the
ZDF rat.
|Animals
[MESH]
|Body Weight/drug effects
[MESH]
|Canagliflozin
[MESH]
|Diabetes Mellitus, Type 2/complications/*metabolism
[MESH]