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2016 ; 136
(6
): 1130-1142
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?-Catenin Stabilization in Skin Fibroblasts Causes Fibrotic Lesions by Preventing
Adipocyte Differentiation of the Reticular Dermis
#MMPMID26902921
Mastrogiannaki M
; Lichtenberger BM
; Reimer A
; Collins CA
; Driskell RR
; Watt FM
J Invest Dermatol
2016[Jun]; 136
(6
): 1130-1142
PMID26902921
show ga
The Wnt/?-catenin pathway plays a central role in epidermal homeostasis and
regeneration, but how it affects fibroblast fate decisions is unknown. We
investigated the effect of targeted ?-catenin stabilization in dermal
fibroblasts. Comparative gene expression profiling of stem cell antigen 1(-)
(Sca1(-)) and Sca1(+) neonatal fibroblasts from upper and lower dermis,
respectively, confirmed that Sca1(+) cells had a preadipocyte signature and
showed differential expression of Wnt/?-catenin-associated genes. By targeting
all fibroblasts or selectively targeting Dlk1(+) lower dermal fibroblasts, we
found that ?-catenin stabilization between developmental stages E16.5 and P2
resulted in a reduction in the dermal adipocyte layer with a corresponding
increase in dermal fibrosis and an altered hair cycle. The fibrotic phenotype
correlated with a reduction in the potential of Sca1(+) fibroblasts to undergo
adipogenic differentiation ex vivo. Our findings indicate that Wnt/?-catenin
signaling controls adipogenic cell fate within the lower dermis, which
potentially contributes to the pathogenesis of fibrotic skin diseases.