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Publication : Osteoblastic Lrp4 promotes osteoclastogenesis by regulating ATP release and adenosine-A<sub>2A</sub>R signaling.

First Author  Xiong L Year  2017
Journal  J Cell Biol Volume  216
Issue  3 Pages  761-778
PubMed ID  28193701 Mgi Jnum  J:249351
Mgi Id  MGI:5920300 Doi  10.1083/jcb.201608002
Citation  Xiong L, et al. (2017) Osteoblastic Lrp4 promotes osteoclastogenesis by regulating ATP release and adenosine-A2AR signaling. J Cell Biol 216(3):761-778
abstractText  Bone homeostasis depends on the functional balance of osteoblasts (OBs) and osteoclasts (OCs). Lrp4 is a transmembrane protein that is mutated in patients with high bone mass. Loss of Lrp4 in OB-lineage cells increases bone mass by elevating bone formation by OBs and reducing bone resorption by OCs. However, it is unclear how Lrp4 deficiency in OBs impairs osteoclastogenesis. Here, we provide evidence that loss of Lrp4 in the OB lineage stabilizes the prorenin receptor (PRR) and increases PRR/V-ATPase-driven ATP release, thereby enhancing the production of the ATP derivative adenosine. Both pharmacological and genetic inhibition of adenosine-2A receptor (A2AR) in culture and Lrp4 mutant mice diminishes the osteoclastogenic deficit and reduces trabecular bone mass. Furthermore, elevated adenosine-A2AR signaling reduces receptor activator of nuclear factor kappaB (RANK)-mediated osteoclastogenesis. Collectively, these results identify a mechanism by which osteoblastic Lrp4 controls osteoclastogenesis, reveal a cross talk between A2AR and RANK signaling in osteoclastogenesis, and uncover an unrecognized pathophysiological mechanism of high-bone-mass disorders.
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