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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
2014 ; 289
(23
): 16374-88
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Myeloid cell-specific disruption of Period1 and Period2 exacerbates diet-induced
inflammation and insulin resistance
#MMPMID24770415
Xu H
; Li H
; Woo SL
; Kim SM
; Shende VR
; Neuendorff N
; Guo X
; Guo T
; Qi T
; Pei Y
; Zhao Y
; Hu X
; Zhao J
; Chen L
; Chen L
; Ji JY
; Alaniz RC
; Earnest DJ
; Wu C
J Biol Chem
2014[Jun]; 289
(23
): 16374-88
PMID24770415
show ga
The circadian clockworks gate macrophage inflammatory responses. Given the
association between clock dysregulation and metabolic disorders, we conducted
experiments to determine the extent to which over-nutrition modulates macrophage
clock function and whether macrophage circadian dysregulation is a key factor
linking over-nutrition to macrophage proinflammatory activation, adipose tissue
inflammation, and systemic insulin resistance. Our results demonstrate that 1)
macrophages from high fat diet-fed mice are marked by dysregulation of the
molecular clockworks in conjunction with increased proinflammatory activation, 2)
global disruption of the clock genes Period1 (Per1) and Per2 recapitulates this
amplified macrophage proinflammatory activation, 3) adoptive transfer of
Per1/2-disrupted bone marrow cells into wild-type mice potentiates high fat
diet-induced adipose and liver tissue inflammation and systemic insulin
resistance, and 4) Per1/2-disrupted macrophages similarly exacerbate inflammatory
responses and decrease insulin sensitivity in co-cultured adipocytes in vitro.
Furthermore, PPAR? levels are decreased in Per1/2-disrupted macrophages and
PPAR?2 overexpression ameliorates Per1/2 disruption-associated macrophage
proinflammatory activation, suggesting that this transcription factor may link
the molecular clockworks to signaling pathways regulating macrophage
polarization. Thus, macrophage circadian clock dysregulation is a key process in
the physiological cascade by which diet-induced obesity triggers macrophage
proinflammatory activation, adipose tissue inflammation, and insulin resistance.