Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 378, Issue 3, Pages 645-649Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2008.11.115
Keywords
PPAR gamma agonist; Osteoclast differentiation; Bone resorption
Categories
Funding
- Korea Health 21 RD Project [(A010252)]
- Korea Science and Engineering Foundation (KOSEF)
- Korean government (MOST) [M10646020001-06N4602-00110]
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We investigated the effects of a novel peroxisome proliferator-activated receptor gamma (PPAR gamma) agonist, KR62776, on osteoclast differentiation and function, and on the underlying signaling pathways. KR62776 markedly suppressed differentiation into osteoclasts in various osteoclast model systems, including bone marrow mononuclear (BMM) cells and a co-culture of calvarial osteoblasts and BMM cells. KR62776 suppressed the activation of tartrate-resistant acid phosphatase (TRAP) and the expression of genes associated with osteoclast differentiation, such as TRAP, dendritic cell-specific transmembrane protein (DC-STAMP), and osteoclast-associated receptor (OSCAR). Furthermore, KR62776 reduced resorption pit formation in osteoclasts, and down-regulated genes essential for osteoclast activity, such as Src and alpha nu beta 3 integrin. An analysis of a signaling pathway showed that KR62776 inhibited the receptor activator of nuclear factor-kappa B ligand (RANKL)-induced activation of p38 mitogen-activated protein kinase (p38MAPK), extracellular regulated kinase (ERK), c-Jun N-terminal kinase (JNK) and nuclear factor-kappa B (NF-kappa B). Together, these results demonstrate that KR62776 negatively affects osteoclast differentiation and activity by inhibiting the RANKL-induced activation of MAP kinases and NF-kappa B. Crown Copyright (C) 2008 Published by Elsevier Inc. All rights reserved.
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