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2014 ; 63
(4
): 1340-52
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Otopetrin 1 protects mice from obesity-associated metabolic dysfunction through
attenuating adipose tissue inflammation
#MMPMID24379350
Wang GX
; Cho KW
; Uhm M
; Hu CR
; Li S
; Cozacov Z
; Xu AE
; Cheng JX
; Saltiel AR
; Lumeng CN
; Lin JD
Diabetes
2014[Apr]; 63
(4
): 1340-52
PMID24379350
show ga
Chronic low-grade inflammation is emerging as a pathogenic link between obesity
and metabolic disease. Persistent immune activation in white adipose tissue (WAT)
impairs insulin sensitivity and systemic metabolism, in part, through the actions
of proinflammatory cytokines. Whether obesity engages an adaptive mechanism to
counteract chronic inflammation in adipose tissues has not been elucidated. Here
we identified otopetrin 1 (Otop1) as a component of a counterinflammatory pathway
that is induced in WAT during obesity. Otop1 expression is markedly increased in
obese mouse WAT and is stimulated by tumor necrosis factor-? in cultured
adipocytes. Otop1 mutant mice respond to high-fat diet with pronounced insulin
resistance and hepatic steatosis, accompanied by augmented adipose tissue
inflammation. Otop1 attenuates interferon-? (IFN-?) signaling in adipocytes
through selective downregulation of the transcription factor STAT1. Using a
tagged vector, we found that Otop1 physically interacts with endogenous STAT1.
Thus, Otop1 defines a unique target of cytokine signaling that attenuates
obesity-induced adipose tissue inflammation and plays an adaptive role in
maintaining metabolic homeostasis in obesity.
|Adipose Tissue, White/metabolism
[MESH]
|Adipose Tissue/*pathology
[MESH]
|Animals
[MESH]
|Diet, High-Fat
[MESH]
|Homeostasis/drug effects
[MESH]
|Inflammation/immunology/*prevention & control
[MESH]