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Zhonghua Kou Qiang Yi Xue Za Zhi. 2012 Sep;47(9):562-6. doi: 10.3760/cma.j.issn.1002-0098.2012.09.014.

[Effects of DNAX-associated protein 12 signal pathways on differentiation of mouse monocytes RAW264.7 into osteoclasts by tensile strain].

[Article in Chinese]

Author information

1
Dental Center, Second Xiangya Hospital, Central South University, Changsha 410011, China. huangsg1964@126.com

Abstract

OBJECTIVE:

To explore the effect of DNAX-associated protein 12 (DAP12) pathway on the transformation from mouse monocytes RAW264.7 to osteoclasts induced by tensile strain.

METHODS:

DAP12shRNA plasmid was constructed and introduced to RAW264.7 cells. Then we supplied tensile strain to RAW264.7 cells by four-point bending system. The mRNA or protein expression of DAP12, tartrate-resistant acid phosphatase (TRAP), tyrosine kinases Btk and Tec and nuclear facior of activated T cells 1 (NFATc1) was measured by reverse transcription PCR (RT-PCR) and Western blotting respectively.

RESULTS:

The expression of DAP12 mRNA (0.112 ± 0.025) and protein (0.193 ± 0.015) both declined sharply after plasmid being introduced into monocytes RAW264.7 (P < 0.05). After silencing DAP12 expression in RAW264.7 cells by RNA interference, tensile strain-induced TRAP mRNA expression of RAW264.7 cells increased at 6 h (0.671 ± 0.031) and 12 h (0.800 ± 0.043) (P < 0.05), but it was weaker than non-RNA-interference-groups at each time point (P < 0.05). After silencing DAP12 expression in RAW264.7 cells by RNA interference, the expressions of Btk, Tec, NFATc1 increased as time passed (6, 12 h) (P < 0.05), but the expressions on corresponding time decreased sharply compared with those in control groups (P < 0.05).

CONCLUSIONS:

DAP12 pathway play an important role in regulating osteoclast differentiation induced by tensile strain.

PMID:
23141733
[Indexed for MEDLINE]
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