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2018 ; 2018
(ä): 5697970
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The Antidiabetic Agent Sodium Tungstate Induces Abnormal Glycogen Accumulation in
Renal Proximal Tubules from Diabetic IRS2-Knockout Mice
#MMPMID30003110
Bertinat R
; Westermeier F
; Silva P
; Gatica R
; Oliveira JM
; Nualart F
; Gomis R
; Yáñez AJ
J Diabetes Res
2018[]; 2018
(ä): 5697970
PMID30003110
show ga
The kidney is an insulin-sensitive organ involved in glucose homeostasis. One
major effect of insulin is to induce glycogen storage in the liver and muscle.
However, no significant glycogen stores are detected in normal kidneys, but
diabetic subjects present a characteristic renal histopathological feature
resulting from extensive glycogen deposition mostly in nonproximal tubules. The
mechanism of renal glycogen accumulation is yet poorly understood. Here, we
studied in situ glycogen accumulation in the kidney from diabetic IRS2-knockout
mice and the effect of the insulin-mimetic agent sodium tungstate (NaW).
IRS2-knockout mice displayed hyperglycemia and hyperinsulinemia. NaW only
normalized glycemia. There was no evident morphological difference between
kidneys from untreated wild-type (WT), NaW-treated WT, and untreated
IRS2-knockout mice. However, NaW-treated IRS2-knockout mice showed tubular
alterations resembling clear cells in the cortex, but not in the outer medulla,
that were correlated with glycogen accumulation. Immunohistochemical detection of
the gluconeogenic enzyme phosphoenolpyruvate carboxykinase, mostly expressed by
renal proximal tubules, showed that altered tubules were of proximal origin. Our
preliminary study suggests that IRS2 differentially regulates glycogen
accumulation in renal tubules and that NaW treatment in the context of IRS2
ablation induces abnormal glycogen accumulation in cortical proximal tubules.