Cbfa1-independent decrease in osteoblast proliferation, osteopenia, and persistent embryonic eye vascularization in mice deficient in Lrp5, a Wnt coreceptor
Masaki Kato,Millan S. Patel,Regis Levasseur,Ivan Borisovich Lobov,Benny Hung-Junn Chang,Donald A. Glass,Christine Hartmann,Lan Li,Tae-Ho Hwang,Cory Brayton,Richard A. Lang,Gerard Karsenty,Lawrence Chan +12 more
TLDR
It is shown that mice with a targeted disruption of Lrp5 develop a low bone mass phenotype, and it is demonstrated that this phenotype becomes evident postnatally, and that it is secondary to decreased osteoblast proliferation and function in a Cbfa1-independent manner.Abstract:
The low-density lipoprotein receptor-related protein (Lrp)-5 functions as a Wnt coreceptor. Here we show that mice with a targeted disruption of Lrp5 develop a low bone mass phenotype. In vivo and in vitro analyses indicate that this phenotype becomes evident postnatally, and demonstrate that it is secondary to decreased osteoblast proliferation and function in a Cbfa1-independent manner. Lrp5 is expressed in osteoblasts and is required for optimal Wnt signaling in osteoblasts. In addition, Lrp5-deficient mice display persistent embryonic eye vascularization due to a failure of macrophage-induced endothelial cell apoptosis. These results implicate Wnt proteins in the postnatal control of vascular regression and bone formation, two functions affected in many diseases. Moreover, these features recapitulate human osteoporosis-pseudoglioma syndrome, caused by LRP5 inactivation.read more
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Wnt/beta-catenin signaling in development and disease.
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Wnt/β-Catenin Signaling in Mesenchymal Progenitors Controls Osteoblast and Chondrocyte Differentiation during Vertebrate Skeletogenesis
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LDL Receptor-Related Protein 5 (LRP5) Affects Bone Accrual and Eye Development
Yaoqin Gong,R. B. Slee,Naomi Fukai,Georges Rawadi,Sergio Roman-Roman,Anthony M. Reginato,H. W. Wang,Tim Cundy,Francis H. Glorieux,Dorit Lev,M. Zacharin,Konrad Oexle,Jose Marcelino,Wafaa M. Suwairi,Shauna Heeger,G. Sabatakos,Suneel S. Apte,W. N. Adkins,J. Allgrove,M. Arslan-Kirchner,J. A. Batch,Peter Beighton,Graeme C.M. Black,R. G. Boles,L. M. Boon,C. Borrone,Han G. Brunner,G. F. Carle,Bruno Dallapiccola,A. De Paepe,B. Floege,M. L. Halfhide,Barbara Hall,Raoul C.M. Hennekam,Tatsuo Hirose,A. Jans,Harald Jüppner,Chong Ae Kim,K. Keppler-Noreuil,A. Kohlschuetter,Didier Lacombe,M. Lambert,E. Lemyre,T. Letteboer,Leena Peltonen,Rajkumar Ramesar,M. Romanengo,H. Somer,E. Steichen-Gersdorf,Beat Steinmann,Beth A. Sullivan,Andrea Superti-Furga,W. Swoboda,M. J. van den Boogaard,W. Van Hul,Miikka Vikkula,Marcela Votruba,Bernhard Zabel,Teresa Garcia,Roland Baron,Bjorn R. Olsen,Matthew L. Warman +61 more
TL;DR: It is reported that LRP5, encoding the low-density lipoprotein receptor-related protein 5, affects bone mass accrual during growth and is important for the establishment of peak bone mass.
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