Integrin αv in the mechanical response of osteoblast lineage cells.

Integrin αv in the mechanical response of osteoblast lineage cells.
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DOI:
10.1016/j.bbrc.2014.04.006
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发表时间:
2014-05-02
影响因子:
3.1
通讯作者:
Ikeda, Kyoji
Ikeda, Kyoji
中科院分区:
生物学4区
文献类型:
--
作者:
Kaneko, Keiko;Ito, Masako;Naoe, Yoshinori;Lacy-Hulbert, Adam;Ikeda, Kyoji

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尽管成骨细胞系细胞,特别是骨细胞,被认为是骨骼中的主要机械感觉细胞,但机械感受器及其下游的机械信号通路在很大程度上仍不清楚。在这里,我们使用流体切应力机械刺激的成骨细胞模型显示,在缺乏整合素αv的情况下,src底物p130Cas和jnk的磷酸化受到损害,最终导致YAP/TAZ核转位的抑制和随后靶基因的转录激活。在成骨细胞系细胞中,整合素αv的靶向缺失导致了对机械负荷的SOST基因表达的减弱,这表明整合素αv在体内的机械接受中发挥了作用。因此,整合型αv可能是成骨细胞机械传感机制中不可或缺的一部分,并参与机械刺激下src-jnk-yap/taz通路的激活。
Although osteoblast lineage cells, especially osteocytes, are thought to be a primary mechanosensory cell in bone, the identity of the mechano-receptor and downstream mechano-signaling pathways remain largely unknown. Here we show using osteoblastic cell model of mechanical stimulation with fluid shear stress that in the absence of integrin αv, phosphorylation of the Src substrate p130Cas and JNK was impaired, culminating in an inhibition of nuclear translocation of YAP/TAZ and subsequent transcriptional activation of target genes. Targeted deletion of the integrin αv in osteoblast lineage cells results in an attenuated response to mechanical loading in terms of Sost gene expression, indicative of a role for integrin αv in mechanoreception in vivo. Thus, integirn αv may be integral to a mechanosensing machinery in osteoblastic cells and involved in activation of a Src-JNK-YAP/TAZ pathway in response to mechanical stimulation.
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