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J Exp Med. 2006 Apr 17;203(4):1067-80. Epub 2006 Apr 10.

Regulation of osteoclast function and bone mass by RAGE.

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1
Institute of Molecular Medicine and Genomics and Department of Neurology, Medical College of Georgia, Augusta, GA, 30912, USA.

Abstract

The receptor for advanced glycation end products (RAGE) is a member of the immunoglobulin superfamily that has multiple ligands and is implicated in the pathogenesis of various diseases, including diabetic complications, neurodegenerative disorders, and inflammatory responses. However, the role of RAGE in normal physiology is largely undefined. Here, we present evidence for a role of RAGE in osteoclast maturation and function, which has consequences for bone remodeling. Mice lacking RAGE had increased bone mass and bone mineral density and decreased bone resorptive activity in vivo. In vitro-differentiated RAGE-deficient osteoclasts exhibited disrupted actin ring and sealing zone structures, impaired maturation, and reduced bone resorptive activity. Impaired signaling downstream of alphavbeta3 integrin was observed in RAGE(-/-) bone marrow macrophages and precursors of OCs. These results demonstrate a role for RAGE in osteoclast actin cytoskeletal reorganization, adhesion, and function, and suggest that the osteosclerotic-like phenotype observed in RAGE knockout mice is due to a defect in osteoclast function.

PMID:
16606672
PMCID:
PMC2118287
DOI:
10.1084/jem.20051947
[Indexed for MEDLINE]
Free PMC Article

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