The adhesion GPCR GPR126 has distinct, domain-dependent functions in Schwann cell development mediated by interaction with laminin-211.

The adhesion GPCR GPR126 has distinct, domain-dependent functions in Schwann cell development mediated by interaction with laminin-211.
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DOI:
10.1016/j.neuron.2014.12.057
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发表时间:
2015-02-18
期刊:
影响因子:
16.2
通讯作者:
Monk, Kelly R.
Monk, Kelly R.
中科院分区:
医学1区
文献类型:
--
作者:
Petersen, Sarah C.;Luo, Rong;Liebscher, Ines;Giera, Stefanie;Jeong, Sung-Jin;Mogha, Amit;Ghidinelli, Monica;Feltri, M. Laura;Schoeneberg, Torsten;Piao, Xianhua;Monk, Kelly R.

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髓鞘包裹轴突以允许动作电位的快速传播和适当的神经系统功能。在周围神经系统中,雪旺细胞(SC)在包裹轴突节段以形成髓鞘之前将轴突径向分选成1:1的关系。SC髓鞘形成需要粘附G蛋白偶联受体GPR 126,其经历自身蛋白水解裂解成N-末端片段(NTF)和含7个跨膜的C-末端片段(CTF)。在这里,我们表明,GPR 126在SC的发展领域的特定功能,即NTF是必要的和足够的轴突排序,而CTF促进包装通过cAMP升高。GPR 126的这些双相作用由与层粘连蛋白-211的相互作用控制,我们将层粘连蛋白-211定义为GPR 126的新型配体,其通过系留激动剂调节受体信号传导。我们的工作提出了一种模型,其中层粘连蛋白-211介导GPR 126诱导的cAMP水平,以控制SC发育的早期和晚期阶段。
Myelin ensheathes axons to allow rapid propagation of action potentials and proper nervous system function. In the peripheral nervous system, Schwann cells (SCs) radially sort axons into a 1:1 relationship before wrapping an axonal segment to form myelin. SC myelination requires the adhesion G protein-coupled receptor GPR126, which undergoes autoproteolytic cleavage into an N-terminal fragment (NTF) and a 7-transmembrane-containing C-terminal fragment (CTF). Here, we show that GPR126 has domain-specific functions in SC development whereby the NTF is necessary and sufficient for axon sorting while the CTF promotes wrapping through cAMP elevation. These biphasic roles of GPR126 are governed by interactions with Laminin-211, which we define as a novel ligand for GPR126 that modulates receptor signaling via a tethered agonist. Our work suggests a model in which Laminin-211 mediates GPR126-induced cAMP levels to control early and late stages of SC development.
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