• BMB Reports
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• v.46 no.10
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• pp.479-483
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• 2013

The balance between osteoblast-dependent bone formation and osteoclast-dependent bone resorption maintains bone homeostasis. In inflammatory conditions, this balance shifts toward bone resorption, causing osteolytic bone lesions observed in rheumatoid arthritis and periodontitis. A recently discovered family of cytokine IL-17 is widely reported to mediate diverse inflammatory processes. During the last decade, novel roles for IL-17 in skeletal homeostasis have been discovered indicating the potential importance of this cytokine in bone metabolism. This review will summarize and discuss the involvement of IL-17 during bone homeostasis in both physiologic and pathologic conditions. A better understanding of the role of IL-17 in skeletal systems warrants an advance in bone biology, as well as development of therapeutic strategies against bone-lytic diseases, such as rheumatoid arthritis and periodontitis.

• Tuberculosis and Respiratory Diseases
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• v.44 no.2
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• pp.430-434
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• 1997

A 29-year-old male patient was admitted due to subacute onset of right chest pain. He had no history of trauma, chest surgery or other medical disease. Chest roentgenogram showed an expansile, radiolucent lesion on the posterior segment of right seventh rib. Computed tomogram of the chest also showed lytic expansile mass with septation. He took an en-bloc resection of the involved rib. Pathologically there were multiple cystic spaces, filled with blood and collage no fibrous tissue proliferation and locally areas of new bone formation and giant cells of osteoclastic type, which was compatible with aneurysmal bone cyst. We report a case of aneurysmal bone cyst of the rib with a brief review of literature.

• Biomolecules & Therapeutics
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• v.19 no.2
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• pp.141-148
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• 2011

Osteoclasts are bone-resorbing cells of monocyte/macrophage origin and are culprits of bone destruction associated with osteoporosis, rheumatoid arthritis, and cancer bone metastasis. Recent advances in osteoclast biology revealed central roles of various cytokines in regulating osteoclastogenesis both in vitro and in vivo. However, exact underlying mechanisms including signaling pathways downstream of receptor ligation are still under pursuit. In the present review, the role of Jak/STAT proteins and their regulators will be discussed in connection with osteoclastogenesis, since growing evidence indicates that a number of cytokines and growth factors utilizing Jak/STAT signaling pathways affect osteoclastogenesis. A better understanding on the role of Jak/STAT pathways in osteoclast differentiation will not only strengthen our knowledge on osteoclast biology but also provide invaluable insights into the development of anti-resorptive strategies for treating bone-lytic diseases.

• Proceedings of the PSK Conference
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• 2003.10a
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• pp.102-103
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• 2003

Osteoclast are specialized cells derived from the monocyte/macrophage haematopoietic lineage that develop and adhere to bone matrix, then secrete acid and lytic enzymes that degrade it in a specialized, extracellular compartment. Regulation of osteoclast differentiation is central to the understanding of the pathogenesis and treatment of bone diseases such as osteoporosis. (omitted)

• Journal of Physiology & Pathology in Korean Medicine
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• v.33 no.3
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• pp.169-174
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• 2019

The purpose of this study was to evaluate the inhibitory effects of Juglans regia complex extract(JCE) consisted of Juglans regia, Eucommia ulmoides, Eleutherococcus senticosus and Zingiber officinale on osteoclast differentiation. Cell toxicity test by using CCK-8, TRAP activity and TRAP positive multi-nucleated cell counting were performed to evaluate inhibitory effect on differentiation of osteoclast from bone marrow derived macrophages(BMMs) induced by receptor activator of nuclear $factor-{\kappa}B$ ligand(RANKL). As a result, JCE inhibited RANKL-induced osteoclast differentiation in BMMs dose-dependently without cytotoxicity. These results suggest that JCE may have a potential role for treating bone lytic diseases such as osteoporosis.

• The Korean Journal of Physiology and Pharmacology
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• v.13 no.6
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• pp.417-424
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• 2009

Osteoclasts, derived from multipotent myeloid progenitor cells, play homeostatic roles in skeletal modeling and remodeling, but may also destroy bone in pathological conditions such as osteoporosis and rheumatoid arthritis. Osteoclast development depends critically on a differentiation factor, the receptor activator of NF-${\kappa}B$ ligand (RANKL). In this study, we found that the hexane soluble fraction of the common fig Ficus carica (HF6-FC) is a potent inhibitor of osteoclastogenesis in RANKL-stimulated RAW264.7 cells and in bone marrow-derived macrophages (BMMs). HF6-FC exerts its inhibitory effects by suppression of p38 and NF-${\kappa}B$ but activation of ERK. In addition, HF6-FC significantly decreased the expression of NFATc1 and c-Fos, the master regulator of osteoclast differentiation. The data indicate that components of HF6-FC may have therapeutic effects on bone-destructive processes such as osteoporosis, rheumatoid arthritis, and periodontal bone resorption.