LRP4 serves as a coreceptor of agrin.

LRP4 serves as a coreceptor of agrin.
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DOI:
10.1016/j.neuron.2008.10.006
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发表时间:
2008-10-23
期刊:
影响因子:
16.2
通讯作者:
Mei L
Mei L
中科院分区:
医学1区
文献类型:
--
作者:
Zhang B;Luo S;Wang Q;Suzuki T;Xiong WC;Mei L

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神经肌肉接头(NMJ)的形成需要聚集蛋白(一种从运动神经元释放的因子)和MuSK(一种由聚集蛋白激活的跨膜酪氨酸激酶)。然而,信号如何从聚集蛋白转导到MuSK仍不清楚。在这里,我们报告,低密度脂蛋白受体(LDLR)相关蛋白(LRP)4(LRP 4)作为一个辅助受体的聚集蛋白。LRP 4在肌管中特异性表达,并集中在NMJ。LRP4的胞外结构域与神经元聚集蛋白相互作用,但不与肌肉聚集蛋白相互作用。LRP4的表达使聚集蛋白结合活性和MuSK信号传导在细胞中,否则不响应聚集蛋白。抑制LRP4表达减弱聚集蛋白结合活性、聚集蛋白诱导的MuSK酪氨酸磷酸化和肌肉细胞中的AChR聚集。LRP 4还以被聚集蛋白刺激的方式与MuSK相互作用。最后,我们发现LRP 4在聚集蛋白刺激的肌肉细胞中变得酪氨酸磷酸化。这些观察将LRP 4鉴定为聚集蛋白的功能性共受体,其对于聚集蛋白诱导的MuSK信号传导和AChR聚集是必需的。
Formation of the neuromuscular junction (NMJ) requires agrin, a factor released from motoneurons, and MuSK, a transmembrane tyrosine kinase that is activated by agrin. However, how signal is transduced from agrin to MuSK remains unclear. Here we report that low-density lipoprotein receptor (LDLR)-related protein (LRP) 4 (LRP4) functions as a co-receptor of agrin. LRP4 is specifically expressed in myotubes and is concentrated at the NMJ. The extracellular domain of LRP4 interacts with neuronal, but not muscle, agrin. Expression of LRP4 enables agrin binding activity and MuSK signaling in cells that otherwise does not respond to agrin. Suppression of LRP4 expression attenuates agrin binding activity, agrin-induced MuSK tyrosine phosphorylation and AChR clustering in muscle cells. LRP4 also interacts with MuSK in a manner that is stimulated by agrin. Finally, we showed that LRP4 becomes tyrosine-phosphorylated in agrin-stimulated muscle cells. These observations identify LRP4 as a functional co-receptor of agrin that is necessary for agrin-induced MuSK signaling and AChR clustering.
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