title: Tanshinone IIA inhibits osteoclast differentiation through down-regulation of c-Fos and NFATc1.
abstract: Bone is a dynamic tissue that is regulated by the activity of bone-resorbing osteoclasts and bone-forming osteoblasts. Excessive osteoclast formation causes diseases such as osteoporosis and rheumatoid arthritis. Natural substances may be useful as therapeutic drugs to prevent many diseases in humans because they avoid the many side effects of treatment with chemical compounds. Here we show that tanshinone IIA isolated from Salvia miltiorrhiza Bunge inhibits the receptor activator of NF-kappaB ligand (RANKL)-mediated osteoclast differentiation of osteoclast precursors. Tanshinone IIA suppressed the expression levels of c-Fos and NFATc1 induced by RANKL. However, retrovirus-mediated overexpression of c-Fos induced the expression of NFATc1 despite the presence of tanshinone IIA and reversed the inhibitory effect of tanshinone IIA on osteoclast differentiation. Also, the introduction of osteoclast precursors with the NFATc1 retrovirus led to osteoclast differentiation in the presence of tanshinone IIA. Our results suggest that tanshinone IIA may have a role as a therapeutic drug in the treatment of bone disease such as osteoporosis.
authors.affiliation: Department of Cell and Developmental Biology, School of Dentistry, DRI, and BK21 Program, Seoul National University, Seoul 110-749, Korea.
authors.forename: Han Bok
authors.initials: HB
authors.lastname: Kwak
authors.forename: Daum
authors.initials: D
authors.lastname: Yang
authors.forename: Hyunil
authors.initials: H
authors.lastname: Ha
authors.forename: Jong Ho
authors.initials: JH
authors.lastname: Lee
authors.forename: Ha Neui
authors.initials: HN
authors.lastname: Kim
authors.forename: Eun Ran
authors.initials: ER
authors.lastname: Woo
authors.forename: Seungbok
authors.initials: S
authors.lastname: Lee
authors.forename: Hong Hee
authors.initials: HH
authors.lastname: Kim
authors.forename: Zang Hee
authors.initials: ZH
authors.lastname: Lee
mesh_terms: D045784:Abietanes; D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects*; D002478:Cells, Cultured; D015536:Down-Regulation / Q000187:drug effects; D015870:Gene Expression / Q000187:drug effects / Q000235:genetics; D015151:Immunoblotting; D016173:Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D051379:Mice; D008813:Mice, Inbred ICR; D050778:NFATC Transcription Factors / Q000235:genetics / Q000378:metabolism*; D010010:Osteoclasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D010616:Phenanthrenes / Q000494:pharmacology*; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics / Q000378:metabolism*; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D045784:Abietanes; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D050778:NFATC Transcription Factors; C494005:Nfatc1 protein, mouse; D010616:Phenanthrenes; D016760:Proto-Oncogene Proteins c-fos; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; C505687:Tnfrsf11a protein, mouse; C505689:Tnfsf11 protein, mouse; C021751:tanshinone; D016173:Macrophage Colony-Stimulating Factor