Osteoblastic Lrp4 promotes osteoclastogenesis by regulating ATP release and adenosine-A2AR signaling

Lei Xiong, Ji Ung Jung, Hao Han Guo, Jin Xiu Pan, Xiang Dong Sun, Lin Mei, Wencheng Xiong

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

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 κB (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.

Original languageEnglish (US)
Pages (from-to)761-778
Number of pages18
JournalJournal of Cell Biology
Volume216
Issue number3
DOIs
StatePublished - Jan 1 2017

ASJC Scopus subject areas

  • Cell Biology

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    Xiong, L., Jung, J. U., Guo, H. H., Pan, J. X., Sun, X. D., Mei, L., & Xiong, W. (2017). Osteoblastic Lrp4 promotes osteoclastogenesis by regulating ATP release and adenosine-A2AR signaling. Journal of Cell Biology, 216(3), 761-778. https://doi.org/10.1083/jcb.201608002