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Author Zhang, Jie ♦ Xu, Haixia ♦ Han, Zhongyu ♦ Chen, Ping ♦ Yu, Qiang ♦ Lei, Yutian ♦ Li, Zongze ♦ Zhao, Ming ♦ Tian, Jing
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ ACID PHOSPHATASE ♦ CALCIUM IONS ♦ ELECTROMAGNETIC FIELDS ♦ INHIBITION ♦ PULSES ♦ SIGNALS ♦ TRAPS
Abstract Pulsed electromagnetic field (PEMF) has been reported to improve bone healing in osteoporosis patients. However, the precise mechanism has remained largely unknown. This study aimed to investigate the effects of PEMF on nuclear factor κB ligand (RANKL)-dependent osteoclastic differentiation and the Ca{sup 2+}-calcineurin-NFATc1 signaling pathway in RAW264.7 cells in vitro. Treating RAW264.7 cells with RANKL for 4 days induced osteoclastic differentiation in vitro, and the formation of multinucleated osteoclasts, bone resorption-pit formation, tartrate-resistant acid phosphatase (TRAP) activity and the protein levels of cathepsin K, TRAP, Nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1) and matrix metalloproteinase 9 (MMP-9) were significantly decreased. The mRNA levels of specific genes related to osteoclastogenesis (TRAP, NFATc1, CTSK and MMP-9) were also reduced. Moreover, the oscillations of intracellular Ca{sup 2+} in RANKL-dependent RAW264.7 cells were suppressed by PEMF, as well as by inhibitors of membrane and store-operated Ca{sup 2+} channels. Meanwhile, calcineurin activity was increased, although its protein level was not changed. PEMF increased phospho-NFATc1 in the cytosol while suppressing the nuclear translocation of NFATc1, thus inhibiting osteoclastic differentiation by suppressing the Ca{sup 2+}-calcineurin-NFATc1 signaling pathway. Although many questions remain unresolved, to our knowledge, this is the first report demonstrating that PEMF is beneficial against RANKL-dependent osteoclastic differentiation in RAW264.7 cells in vitro via inhibiting the Ca{sup 2+}-calcineurin-NFATc1 signaling pathway.
ISSN 0006291X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-01-08
Publisher Place United States
Journal Biochemical and Biophysical Research Communications
Volume Number 482
Issue Number 2


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