Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica ›› 2013, Vol. 35 ›› Issue (1): 58-63.doi: 10.3881/j.issn.1000-503X.2013.01.011

• Original Articles • Previous Articles     Next Articles

Effects of Static Magnetic Field with Different Exposure Timeon the Maturation of Rat Osteoblasts in vitro andthe Expression of the Estrogen Receptor Gene

WANG Jia-qi, MA Xiao-ni, ZHOU Jian, GE Bao-feng, GUO Xiao-yu, CHEN Ke-ming   

  1. Institute of Orthopaedics, Lanzhou General Hospital of Lanzhou PLA, Lanzhou 730050, China
  • Received:2012-05-14 Online:2013-03-07 Published:2013-03-07
  • Supported by:
    Supported by the Major Science and Technology Project of Gansu Province(09ZNKDA025)

Abstract: Objective To investigate the effects of static magnetic fields (SMFs) with different exposure time on the maturation of rat osteoblasts in vitro and the expression of the estrogen receptor (ER) gene. Methods The calvarial osteoblasts were isolated from newborn rats by enzyme digestion and randomly divided into 9 groups after one passage based on the exposure time of the SMFs[0 (control), 0.5 h, 1.0 h, 1.5 h, 2.0 h, 2.5 h, 3.0 h, 3.5 h, and 4.0 h]. The intensity was 3.9 mT in all SMFs. Those without SMFs exposure were used as the controls. The oeteoblasts were observed under the contrast phase microscope on a daily basis. After 48 h, cell proliferation was assayed by MTT method. The osteocalcin contents were measured after exposure to SMFs for 3 d, 6 d, 9 d, and 12 d. ERα and ERβ mRNA expressions were measured by real-time PCR after SMFs treatment for 0 h, 24 h, 48 h, and 72 h. Results Compared with the controls, the cell proliferation was significantly enhanced in the 2.0-h, 2.5-h, and 3.0-h groups (P<0.05). After SMFs treatment for 6 d, 9 d and 12 d, the 2.5-h group had significantly higher osteocalcin content than the control group did (P<0.05). After SMFs treatment for 0 h and 72 h, elevated ERα mRNA expression and reduced ERβ mRNA expression were observed. Conclusion Exposure to SMFs, regardless of exposure time, is associated with enhanced cell proliferation, increased osteocalcin contents, and altered ERα and ERβ mRNA expressions in opposite directions.

Key words: osteoblasts, static magnetic fields, differentation, estrogen receptor

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