Casein kinase 1 delta functions at the centrosome to mediate Wnt-3a-dependent neurite outgrowth.

Casein kinase 1 delta functions at the centrosome to mediate Wnt-3a-dependent neurite outgrowth.
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DOI:
10.1083/jcb.201011111
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发表时间:
2011-03-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rubin JS
Rubin JS
中科院分区:
其他
文献类型:
--
作者:
Greer YE;Rubin JS

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在对WNT-3a的反应中,轴突生长需要有中心体定位的激活型细胞角蛋白1δ。先前,我们确定Disheveled-2/3(DVL)在尤文肉瘤家族肿瘤细胞中介导Wnt-3a依赖的轴突生长。在这里,我们报告了轴突延伸与DVL磷酸化有关,并且两者都被酪蛋白激酶1(CK1)δ/ε抑制剂IC261抑制。针对CK1δ或CK1ε的小干扰RNA降低了DVL的磷酸化,但只有CK1δ被敲除后才能阻止轴突的生长。在与轴突形成有关的细胞器中心体上检测到CK1δ,但未检测到CK1ε。缺失分析将CK1δ的中心体定位信号定位到其C-末端结构域。含有CLS和EGFP的融合蛋白取代了中心体上的全长CK1δ,并抑制了依赖WNT-3a的轴突生长。与野生型CK1ε不同,由CK1ε的激动域和CK1δ的CLS组成的嵌合体定位于中心体,并挽救了被CK1δ敲除抑制的WNT-3a依赖的轴突生长。这些结果提供了强有力的证据,证明CK1δ的中心体定位是WNT-3a依赖的神经发生所必需的。
Centrosomal localization of kinase-active CK1δ is required for neurite outgrowth in response to Wnt-3a. Previously we determined that Dishevelled-2/3 (Dvl) mediate Wnt-3a–dependent neurite outgrowth in Ewing sarcoma family tumor cells. Here we report that neurite extension was associated with Dvl phosphorylation and that both were inhibited by the casein kinase 1 (CK1) δ/ε inhibitor IC261. Small interfering RNAs targeting either CK1δ or CK1ε decreased Dvl phosphorylation, but only knockdown of CK1δ blocked neurite outgrowth. CK1δ but not CK1ε was detected at the centrosome, an organelle associated with neurite formation. Deletion analysis mapped the centrosomal localization signal (CLS) of CK1δ to its C-terminal domain. A fusion protein containing the CLS and EGFP displaced full-length CK1δ from the centrosome and inhibited Wnt-3a–dependent neurite outgrowth. In contrast to wild-type CK1ε, a chimera comprised of the kinase domain of CK1ε and the CLS of CK1δ localized to the centrosome and rescued Wnt-3a–dependent neurite outgrowth suppressed by CK1δ knockdown. These results provide strong evidence that the centrosomal localization of CK1δ is required for Wnt-3a–dependent neuritogenesis.
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