Journal
SHOCK
Volume 33, Issue 6, Pages 662-667Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/SHK.0b013e3181cc0738
Keywords
Thiazolidinediones; TNF-alpha; osteoclast; RAW264.7 macrophages; bone marrow cells; NFATc1
Funding
- National Science Council of Taiwan [NSC97-2320-B-002-019-MY3]
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TNF-alpha plays critical roles in bone-resorbing diseases, such as rheumatoid arthritis. Recent evidence suggests that thiazolidinediones (TZDs), which are peroxisome proliferator-activated receptor gamma agonists, have anti-inflammatory effects. The aim of this study was to evaluate the effect of TZDs on the TNF-alpha-mediated osteoclastogenesis of osteoclast precursor cells. TNF-alpha treatment of RAW264.7 murine macrophages or mouse bone marrow cells induced significant multinuclear osteoclast formation, and these differentiated osteoclast cells possessed bone-resorbing activity. The TZD drugs, rosiglitazone and pioglitazone, significantly inhibited TNF-alpha-induced osteoclast differentiation from both cell types and subsequent bone resorption. Reverse transcriptase-polymerase chain reaction, reporter gene assays, and Western blot results revealed that TZD treatment significantly suppressed NFATc1 expression. Moreover, GW9662 (a peroxisome proliferator-activated receptor gamma antagonist) prevented the inhibitory effect of TZDs on NFATc1 expression and osteoclast differentiation. In summary, our results demonstrate that TZDs inhibit TNF-alpha-mediated osteoclast differentiation by downregulation of NFATc1 expression. This observation increases the therapeutic applications of TZDs in inflammatory bone-resorbing diseases.
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