Effects of four kinds of electromagnetic fields (EMF) with different frequency spectrum bands on ovariectomized osteoporosis in mice.

Abstract

Electromagnetic fields (EMF) was considered as a non-invasive modality for treatment of osteoporosis while the effects were diverse with EMF parameters in time domain. In present study, we extended analysis of EMF characteristics from time domain to frequency domain, aiming to investigate effects of four kinds of EMF (LP (1-100 Hz), BP (100-3,000 Hz), HP (3,000-50,000 Hz) and AP (1-50,000 Hz)) on ovariectomized (OVX) osteoporosis (OP) in mice. Forty-eight 3-month-old female BALB/c mice were equally assigned to Sham, OVX, OVX + LP, OVX + BP, OVX + HP and OVX + AP groups (n = 8). After 8-week exposure (3 h/day), LP and BP significantly increased serum bone formation markers and osteogenesis-related gene expressions compared with OVX. Bedsides, LP and BP also slightly increased bone resorption activity compared with OVX, evidenced by increased RANKL/OPG ratio. HP sharply decreased serum bone formation and resporption markers and osteogenesis and osteoclastogenesis related gene expressions compared with OVX. AP had accumulative effects of LP, BP and HP, which significantly increased bone formation and decreased bone resporption activity compared with OVX. As a result, LP, BP and HP exposure did not later deterioration of bone mass, microarchitecture and mechanical strength in OVX mice with OP. However, AP stimulation attenuated OVX-induced bone loss.

• Authors: Tao Lei, Feijiang Li, Zhuowen Liang, Chi Tang, Kangning Xie, Pan Wang, Xu Dong, Shuai Shan, Juan Liu, Qiaoling Xu, Erping Luo, Guanghao Shen
• Journal: Scientific reports (Sci Rep) Vol. 7 Issue 1 Pg. 553 (04 03 2017) ISSN: 2045-2322 [Electronic] England
• PMID: 28373666 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers

Topics

• Animals
• Biomarkers
• Body Weight
• Bone Density
• Bone and Bones (diagnostic imaging, metabolism, pathology, radiation effects)
• Disease Models, Animal
• Electromagnetic Fields
• Female
• Humans
• Magnetic Field Therapy (methods)
• Mice
• Osteoporosis (diagnosis, etiology, metabolism, therapy)
• Osteoporosis, Postmenopausal (blood, diagnosis, metabolism, therapy)
• Ovariectomy (adverse effects)
• X-Ray Microtomography