Ror2 modulates the canonical Wnt signaling in lung epithelial cells through cooperation with Fzd2.

Ror2 modulates the canonical Wnt signaling in lung epithelial cells through cooperation with Fzd2.
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DOI:
10.1186/1471-2199-9-11
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发表时间:
2008-01-23
影响因子:
--
通讯作者:
Minoo P
Minoo P
中科院分区:
生物3区
文献类型:
--
作者:
Li C;Chen H;Hu L;Xing Y;Sasaki T;Villosis MF;Li J;Nishita M;Minami Y;Minoo P

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Wnt信号传导通过1)β-连环蛋白依赖性经典途径和2)β-连环蛋白非依赖性途径介导。多种受体,包括Fzds、Lrps、Ror 2和Ryk,参与Wnt信号传导。Ror 2是一种单跨膜受体酪氨酸激酶(RTK)。Ror 2在介导非经典Wnt信号传导中的功能已经被很好地确定。Ror 2在经典Wnt信号传导中的作用尚未完全了解。在这里,我们报告说,Ror 2也积极调节Wnt 3a激活的典型信号在肺癌,H441细胞系。Ror 2的这种活性依赖于与Fzd 2而不是Fzd 7的协同相互作用。此外,Ror 2介导的经典信号传导的增强需要细胞外CRD,但不需要Ror 2的细胞内PRD结构域。我们进一步提供的证据表明,经典的Wnt信号转导的Ror 2的积极作用是抑制Dkk 1和Krm 1表明,Ror 2增强LRP依赖性STF反应。目前的研究证明了Ror 2在调节经典Wnt信号传导中的功能。这些发现支持一个功能方案,即Wnt信号的调节是通过多种介质的合作功能来实现的。
Wnt signaling is mediated through 1) the beta-catenin dependent canonical pathway and, 2) the beta-catenin independent pathways. Multiple receptors, including Fzds, Lrps, Ror2 and Ryk, are involved in Wnt signaling. Ror2 is a single-span transmembrane receptor-tyrosine kinase (RTK). The functions of Ror2 in mediating the non-canonical Wnt signaling have been well established. The role of Ror2 in canonical Wnt signaling is not fully understood. Here we report that Ror2 also positively modulates Wnt3a-activated canonical signaling in a lung carcinoma, H441 cell line. This activity of Ror2 is dependent on cooperative interactions with Fzd2 but not Fzd7. In addition, Ror2-mediated enhancement of canonical signaling requires the extracellular CRD, but not the intracellular PRD domain of Ror2. We further provide evidence that the positive effect of Ror2 on canonical Wnt signaling is inhibited by Dkk1 and Krm1 suggesting that Ror2 enhances an Lrp-dependent STF response. The current study demonstrates the function of Ror2 in modulating canonical Wnt signaling. These findings support a functional scheme whereby regulation of Wnt signaling is achieved by cooperative functions of multiple mediators.
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影响因子: 4.8
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