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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한골대사학회 대한골대사학회지 대한골대사학회지 제21권 제4호
발행연도
2014.1
수록면
269 - 275 (7page)

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Background: Osteoclasts are differentiated from monocytes/macrophage colony-stim-ulating factor (M-CSF) and receptor activator of nuclear factor-kappa B (NF-κB) ligand(RANKL). Croton pycnanthus Benth. (CPB) is a herbal plant that belongs to Euphorbiaceaefamily. The aim of this study was to investigate the effects of CPB on osteoclastogenesisand RANKL-dependent signaling pathways. Methods: Methanol extract of CPB was ob-tained from International Biological Material Research Center. Osteoclast differentiationwas achieved by culturing mouse bone marrow-derived macrophages (BMMs) with M-CSF and RANKL. Osteoclast numbers were evaluated by counting multinuclear cells pos-itive for tartrate-resistant acid phosphatase (TRAP). mRNA and protein levels were ana-lyzed by real-time polymerase chain reaction (PCR) and Western blotting, respectively. The activation of signaling molecules were assessed after acute stimulation of cells withhigh dose of RANKL by Western blotting with phospho-specific antibodies. Results: CPBreduced the generation of TRAP-positive multinucleated cells and the activation of mi-togen-activated protein kinase (MAPK) and NF-κB signaling pathways. The induction ofthe expression of c-Fos, nuclear factor-activated T cells c1 (NFATc1) and dendritic cell-spe-cific transmembrane protein (DC-STAMP) by RANKL was also suppressed. Conclusions:CPB exerts negative effects on osteoclast differentiation in response to the RANKL. Theinhibitory mechanism involves the suppression of MAPK and NF-κB signaling pathwaysand subsequently the down-regulation of c-Fos and NFATc1 transcription factors.

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