Journal
CELL CALCIUM
Volume 48, Issue 5, Pages 260-269Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceca.2010.09.010
Keywords
TRPV2; SOCE; Osteoclastogenesis; Calcium oscillations; Transient cation currents; Preosteoclasts
Categories
Funding
- Ministry of Education, Culture, Sports Science and Technology of Japan [18592053, 19592165, 20390475]
- Frontier Research Grant
- Grants-in-Aid for Scientific Research [19592165, 18592053, 20390475] Funding Source: KAKEN
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The receptor activator of NF kappa B ligand (RANKL) induces Ca2+ oscillations and activates the Nuclear Factor of Activated T cells 1 (NFATc1) during osteoclast differentiation (osteoclastogenesis). Ca2+ oscillations are an important trigger signal for osteoclastogenesis, however the molecular basis of Ca2+ permeable influx pathways serving Ca2+ oscillations has not yet been identified. Using a DNA microarray, we found that Transient Receptor Potential Vanilloid channels 2 (TRPV2) are expressed significantly in RANKL-treated RAW264.7 cells (preosteoclasts) compared to untreated cells. Therefore, we further investigated the expression and functional role of TRPV2 on Ca2+ oscillations and osteoclastogenesis. We found that RANKL dominantly up-regulates TRPV2 expression in preosteoclasts, and evokes spontaneous Ca2+ oscillations and a transient inward cation current in a time-dependent manner. TRPV inhibitor ruthenium red and tetracycline-induced TRPV2 silencing significantly decreased both the frequency of Ca2+ oscillations and the transient inward currents in RANKL-treated preosteoclasts. Silencing of store-operated Ca2+ entry (SOCE) proteins similarly suppressed both RANKL-induced oscillations and currents in preosteoclasts. Furthermore, suppression of TRPV2 also reduced RANKL-induced NAFTc1 expression, its nuclear translocation, and osteoclastogenesis. In summary, Ca2+ oscillations in preosteoclasts are triggered by RANKL-dependent TRPV2 and SOCE activation and intracellular Ca2+ release. Subsequent activation of NFATc1 promotes osteoclastogenesis. (C) 2010 Elsevier Ltd. All rights reserved.
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