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Zhonghua Kou Qiang Yi Xue Za Zhi ; 47(9): 562-6, 2012 Sep.
Artigo em Chinês | MEDLINE | ID: mdl-23141733

RESUMO

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.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Monócitos/citologia , Osteoclastos/citologia , Transdução de Sinais , Resistência à Tração , Fosfatase Ácida/genética , Fosfatase Ácida/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Tirosina Quinase da Agamaglobulinemia , Animais , Diferenciação Celular , Linhagem Celular , Regulação da Expressão Gênica , Inativação Gênica , Isoenzimas/genética , Isoenzimas/metabolismo , Camundongos , Monócitos/metabolismo , Fatores de Transcrição NFATC/metabolismo , Plasmídeos , Proteínas Tirosina Quinases/metabolismo , RNA Mensageiro/metabolismo , RNA Interferente Pequeno , Fosfatase Ácida Resistente a Tartarato
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