p75 Is Required for the Establishment of Postnatal Sensory Neuron Diversity by Potentiating Ret Signaling.

p75 Is Required for the Establishment of Postnatal Sensory Neuron Diversity by Potentiating Ret Signaling.
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DOI:
10.1016/j.celrep.2017.09.037
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发表时间:
2017-10-17
期刊:
影响因子:
8.8
通讯作者:
Lee KF
Lee KF
中科院分区:
生物学1区
文献类型:
--
作者:
Chen Z;Donnelly CR;Dominguez B;Harada Y;Lin W;Halim AS;Bengoechea TG;Pierchala BA;Lee KF

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产生充分区分体感所有元素所需的神经元多样性是器官发生过程中的一项复杂任务。在背根神经节(DRG)感觉神经元规范过程中指导这一过程的机制仍然知之甚少。在这里,我们发现 p75 神经营养蛋白受体在受到神经胶质细胞系源性神经营养因子 (GDNF) 刺激后与 Ret 及其 GFRα 辅助受体相互作用。此外,我们证明 p75 是 GDNF 介导的 Ret 激活、存活和 DRG 神经元中 Ret 的细胞表面定位所必需的。在从 E12.5 开始在感觉神经元内特异性删除 p75 的小鼠中,我们观察到在 P14 和成年期之间大约有 20% 的神经元丢失,并且这些丢失选择性地发生在 Ret+ 非肽能伤害感受器亚群中,其中表达低水平 Ret 的神经元受影响最严重。这些结果表明,通过微调 Ret 介导的营养支持,p75 是非肽能伤害感受器谱系发育所必需的。
Producing the neuronal diversity required to adequately discriminate all elements of somatosensation is a complex task during organogenesis. The mechanisms guiding this process during dorsal root ganglion (DRG) sensory neuron specification remain poorly understood. Here we show that the p75 neurotrophin receptor interacts with Ret and its GFRα co-receptor upon stimulation with glial cell line-derived neurotrophic factor (GDNF). Furthermore, we demonstrate that p75 is required for GDNF-mediated Ret activation, survival, and cell surface localization of Ret in DRG neurons. In mice in which p75 is deleted specifically within sensory neurons beginning at E12.5, we observe that approximately 20% of neurons are lost between P14 and adulthood, and these losses selectively occur within a subpopulation of Ret+ nonpeptidergic nociceptors, with neurons expressing low levels of Ret impacted most heavily. These results suggest that p75 is required for the development of the nonpeptidergic nociceptor lineage by fine-tuning Ret-mediated trophic support.
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