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2018 ; 115
(3
): E418-E427
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Induced Gnas(R201H) expression from the endogenous Gnas locus causes fibrous
dysplasia by up-regulating Wnt/?-catenin signaling
#MMPMID29158412
Khan SK
; Yadav PS
; Elliott G
; Hu DZ
; Xu R
; Yang Y
Proc Natl Acad Sci U S A
2018[Jan]; 115
(3
): E418-E427
PMID29158412
show ga
Fibrous dysplasia (FD; Online Mendelian Inheritance in Man no. 174800) is a
crippling skeletal disease caused by activating mutations of the GNAS gene, which
encodes the stimulatory G protein G?(s) FD can lead to severe adverse conditions
such as bone deformity, fracture, and severe pain, leading to functional
impairment and wheelchair confinement. So far there is no cure, as the underlying
molecular and cellular mechanisms remain largely unknown and the lack of
appropriate animal models has severely hampered FD research. Here we have
investigated the cellular and molecular mechanisms underlying FD and tested its
potential treatment by establishing a mouse model in which the human FD mutation
(R201H) has been conditionally knocked into the corresponding mouse Gnas locus.
We found that the germ-line FD mutant was embryonic lethal, and Cre-induced Gnas
FD mutant expression in early osteochondral progenitors, osteoblast cells, or
bone marrow stromal cells (BMSCs) recapitulated FD features. In addition, mosaic
expression of FD mutant G?(s) in BMSCs induced bone marrow fibrosis both cell
autonomously and non-cell autonomously. Furthermore, Wnt/?-catenin signaling was
up-regulated in FD mutant mouse bone and BMSCs undergoing osteogenic
differentiation, as we have found in FD human tissue previously. Reduction of
Wnt/?-catenin signaling by removing one Lrp6 copy in an FD mutant line
significantly rescued the phenotypes. We demonstrate that induced expression of
the FD G?(s) mutant from the mouse endogenous Gnas locus exhibits human FD
phenotypes in vivo, and that inhibitors of Wnt/?-catenin signaling may be
repurposed for treating FD and other bone diseases caused by G?(s) activation.
|Cell Differentiation
[MESH]
|Chromogranins/genetics/*metabolism
[MESH]
|Fibrous Dysplasia of Bone/*genetics
[MESH]
|GTP-Binding Protein alpha Subunits, Gs/genetics/*metabolism
[MESH]