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2015 ; 64
(4
): 1235-48
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Noncanonical Wnt signaling promotes obesity-induced adipose tissue inflammation
and metabolic dysfunction independent of adipose tissue expansion
#MMPMID25352637
Fuster JJ
; Zuriaga MA
; Ngo DT
; Farb MG
; Aprahamian T
; Yamaguchi TP
; Gokce N
; Walsh K
Diabetes
2015[Apr]; 64
(4
): 1235-48
PMID25352637
show ga
Adipose tissue dysfunction plays a pivotal role in the development of insulin
resistance in obese individuals. Cell culture studies and gain-of-function mouse
models suggest that canonical Wnt proteins modulate adipose tissue expansion.
However, no genetic evidence supports a role for endogenous Wnt proteins in
adipose tissue dysfunction, and the role of noncanonical Wnt signaling remains
largely unexplored. Here we provide evidence from human, mouse, and cell culture
studies showing that Wnt5a-mediated, noncanonical Wnt signaling contributes to
obesity-associated metabolic dysfunction by increasing adipose tissue
inflammation. Wnt5a expression is significantly upregulated in human visceral fat
compared with subcutaneous fat in obese individuals. In obese mice, Wnt5a
ablation ameliorates insulin resistance, in parallel with reductions in adipose
tissue inflammation. Conversely, Wnt5a overexpression in myeloid cells augments
adipose tissue inflammation and leads to greater impairments in glucose
homeostasis. Wnt5a ablation or overexpression did not affect fat mass or
adipocyte size. Mechanistically, Wnt5a promotes the expression of proinflammatory
cytokines by macrophages in a Jun NH2-terminal kinase-dependent manner, leading
to defective insulin signaling in adipocytes. Exogenous interleukin-6
administration restores insulin resistance in obese Wnt5a-deficient mice,
suggesting a central role for this cytokine in Wnt5a-mediated metabolic
dysfunction. Taken together, these results demonstrate that noncanonical Wnt
signaling contributes to obesity-induced insulin resistance independent of
adipose tissue expansion.