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Reactivation of a developmental signaling center is required for therapeutic control of the murine periosteal niche.

Salazar, Valerie S and Capelo, Luciane P and Cantù, Claudio and Zimmerli, Dario and Gosalia, Nehal and Pregizer, Steven and Cox, Karen and Ohte, Satoshi and Feigenson, Marina and Gamer, Laura and Nyman, Jeffry S and Carey, David J and Economides, Aris and Basler, Konrad and Rosen, Vicki (2019) Reactivation of a developmental signaling center is required for therapeutic control of the murine periosteal niche. eLife, 8. ISSN 2050-084X

Abstract

Two decades after signals controlling bone length were discovered, the endogenous ligands determining bone width remain unknown. We show that postnatal establishment of normal bone width in mice, as mediated by bone-forming activity of the periosteum, requires BMP signaling at the innermost layer of the periosteal niche. This developmental signaling center becomes quiescent during adult life. Its reactivation however, is necessary for periosteal growth, enhanced bone strength, and accelerated fracture repair in response to bone-anabolic therapies used in clinical orthopedic settings. Although many BMPs are expressed in bone, periosteal BMP signaling and bone formation require only in the lineage. Mechanistically, BMP2 functions downstream of Lrp5/6 pathway to activate a conserved regulatory element upstream of via recruitment of Smad1 and Grhl3. Consistent with our findings, human variants of and are associated with increased risk of fractures.

Item Type: Article
Date Deposited: 09 Mar 2019 00:45
Last Modified: 09 Mar 2019 00:45
URI: https://oak.novartis.com/id/eprint/39129

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