Integrin-mediated mechanotransduction pathway of low-intensity continuous ultrasound in human chondrocytes.

Integrin-mediated mechanotransduction pathway of low-intensity continuous ultrasound in human chondrocytes.
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DOI:
10.1016/j.ultrasmedbio.2012.06.002
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发表时间:
2012-10
影响因子:
2.9
通讯作者:
Subramanian, Anuradha
Subramanian, Anuradha
中科院分区:
医学3区
文献类型:
--
作者:
Whitney, Nicholas P.;Lamb, Allyson C.;Louw, Tobias M.;Subramanian, Anuradha

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Chondrocytes are mechanosensitive cells that require mechanical stimulation for proper growth and function in in vitro culture systems. Ultrasound (US) has emerged as a technique to deliver mechanical stress; however, the intracellular signaling components of the mechanotransduction pathways that transmit the extracellular mechanical stimulus to gene regulatory mechanisms are not fully defined. We evaluated a possible integrin/mitogen-activated protein kinase (MAPK) mechanotransduction pathway using Western blotting with antibodies targeting specific phosphorylation sites on intracellular signaling proteins. US stimulation of chondrocytes induced phosphorylation of focal adhesion kinase (FAK), Src, p130 Crk-associated substrate (p130Cas), CrkII, and extracellular-regulated kinase (Erk). Furthermore, pre-incubation with inhibitors of integrin receptors, Src, and MAPK/Erk kinase (MEK) reduced US-induced Erk phosphorylation levels, indicating integrins and Src are upstream of Erk in an US-mediated mechanotransduction pathway. These findings suggest US signals through integrin receptors to the MAPK/Erk pathway via a mechanotransduction pathway involving FAK, Src, p130Cas, and CrkII.
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