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TNF alpha Increases RANKL Expression via PGE(2)-Induced Activation of NFATc1

Title
TNF alpha Increases RANKL Expression via PGE(2)-Induced Activation of NFATc1
Authors
Park, Hyun-JungBaek, KyunghwaBaek, Jeong-HwaKim, Hyung-Ryong
DGIST Authors
Kim, Hyung-Ryong
Issue Date
2017-03
Citation
International Journal of Molecular Sciences, 18(3)
Type
Article
Article Type
Article
Keywords
TNF alphaRANKLPGE(2)NFATc1CREB
ISSN
1422-0067
Abstract
Tumor necrosis factor α (TNFα) is known to upregulate the expression of receptor activator of NF-κB ligand (RANKL). We investigated the role of the calcineurin/nuclear factor of activated T-cells (NFAT) signaling pathway in TNFα-induced RANKL expression in C2C12 and primary cultured mouse calvarial cells. TNFα-induced RANKL expression was blocked by the calcineurin/NFAT pathway inhibitors. TNFα increased NFAT transcriptional activity and subsequent RANKL promoter binding. Mutations in the NFAT-binding element (MT(N)) suppressed TNFα-induced RANKL promoter activity. TNFα increased prostaglandin E2 (PGE2) production, which in turn enhanced NFAT transcriptional activity and binding to the RANKL promoter. MT(N) suppressed PGE2-induced RANKL promoter activity. TNFα and PGE2 increased the expression of RANKL, NFAT cytoplasmic-1 (NFATc1), cAMP response element-binding protein (CREB), and cyclooxygenase 2 (COX2); which increment was suppressed by indomethacin, a COX inhibitor. Mutations in the CRE-like element blocked PGE2-induced RANKL promoter activity. PGE2 induced the binding of CREB to the RANKL promoter, whereas TNFα increased the binding of both CREB and NFATc1 to this promoter through a process blocked by indomethacin. The PGE2 receptor antagonists AH6809 and AH23848 blocked TNFα-induced expression of RANKL, NFATc1, and CREB; transcriptional activity of NFAT; and binding of NFATc1 or CREB to the RANKL promoter. These results suggest that TNFα-induced RANKL expression depends on PGE2 production and subsequent transcriptional activation/enhanced binding of NFATc1 and CREB to the RANKL promoter. © 2017 by the authors. Licensee MDPI, Basel, Switzerland.
URI
http://hdl.handle.net/20.500.11750/4227
DOI
10.3390/ijms18030495
Publisher
MDPI AG
Related Researcher
Files:
Collection:
ETC1. Journal Articles


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