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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+Biol+Chem
2017 ; 292
(29
): 12339-12350
Nephropedia Template TP
gab.com Text
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English Wikipedia
Deletion of interleukin 1 receptor-associated kinase 1 (Irak1) improves glucose
tolerance primarily by increasing insulin sensitivity in skeletal muscle
#MMPMID28572512
Sun XJ
; Kim SP
; Zhang D
; Sun H
; Cao Q
; Lu X
; Ying Z
; Li L
; Henry RR
; Ciaraldi TP
; Taylor SI
; Quon MJ
J Biol Chem
2017[Jul]; 292
(29
): 12339-12350
PMID28572512
show ga
Chronic inflammation may contribute to insulin resistance via molecular
cross-talk between pathways for pro-inflammatory and insulin signaling.
Interleukin 1 receptor-associated kinase 1 (IRAK-1) mediates pro-inflammatory
signaling via IL-1 receptor/Toll-like receptors, which may contribute to insulin
resistance, but this hypothesis is untested. Here, we used male Irak1 null (k/o)
mice to investigate the metabolic role of IRAK-1. C57BL/6 wild-type (WT) and k/o
mice had comparable body weights on low-fat and high-fat diets (LFD and HFD,
respectively). After 12 weeks on LFD (but not HFD), k/o mice (versus WT) had
substantially improved glucose tolerance (assessed by the intraperitoneal glucose
tolerance test (IPGTT)). As assessed with the hyperinsulinemic euglycemic glucose
clamp technique, insulin sensitivity was 30% higher in the Irak1 k/o mice on chow
diet, but the Irak1 deletion did not affect IPGTT outcomes in mice on HFD,
suggesting that the deletion did not overcome the impact of obesity on glucose
tolerance. Moreover, insulin-stimulated glucose-disposal rates were higher in the
k/o mice, but we detected no significant difference in hepatic glucose production
rates (± insulin infusion). Positron emission/computed tomography scans indicated
higher insulin-stimulated glucose uptake in muscle, but not liver, in Irak1 k/o
mice in vivo Moreover, insulin-stimulated phosphorylation of Akt was higher in
muscle, but not in liver, from Irak1 k/o mice ex vivo In conclusion, Irak1
deletion improved muscle insulin sensitivity, with the effect being most apparent
in LFD mice.